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Marta I Sanchez - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL PAPER High prevalence of Cestodes in Artemia spp. throughout the annual cycle: relationship with abundance of avian final hosts
2016Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Abstract Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almería. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness=0.26), compared to 27–72 % of A. salina (mean species richness=0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal varia-tion in prevalence, abundance, and intensity of Cestode in-fections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance
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comparing Cestode infections and their consequences for host fitness in two sexual branchiopods alien artemia franciscana and native a salina from syntopic populations
PeerJ, 2015Co-Authors: Stella Redon, Francisco Amat, Marta I Sanchez, Andy J GreenAbstract:The American brine shrimp Artemia franciscana is invasive in the Mediterranean region where it has displaced native species (the sexual A. salina, and the clonal A. parthenogenetica) from many salt pond complexes. Artemia populations are parasitized by numerous avian Cestodes whose effects have been studied in native species. We present a study from the Ebro Delta salterns (NE Spain), in a salt pond where both A. franciscana and native A. salina populations coexist, providing a unique opportunity to compare the parasite loads of the two sexual species in syntopy. The native species had consistently higher infection parameters, largely because the dominant Cestode in A. salina adults and juveniles (Flamingolepis liguloides) was much rarer in A. franciscana. The most abundant Cestodes in the alien species were Eurycestus avoceti (in adults) and Flamingolepis flamingo (in juveniles). The abundance of E. avoceti and F. liguloides was higher in the A. franciscana population syntopic with A. salina than in a population sampled at the same time in another pond where the native brine shrimp was absent, possibly because the native shrimp provides a better reservoir for parasite circulation. Infection by Cestodes caused red colouration in adult and juvenile A. salina, and also led to castration in a high proportion of adult females. Both these effects were significantly stronger in the native host than in A. franciscana with the same parasite loads. However, for the first time, significant castration effects (for E. avoceti and F. liguloides) and colour change (for six Cestode species) were observed in infected A. franciscana. Avian Cestodes are likely to help A. franciscana outcompete native species. At the same time, they are likely to reduce the production of A. franciscana cysts in areas where they are harvested commercially.
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high prevalence of Cestodes in artemia spp throughout the annual cycle relationship with abundance of avian final hosts
Parasitology Research, 2013Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almeria. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness = 0.26), compared to 27–72 % of A. salina (mean species richness = 0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal variation in prevalence, abundance, and intensity of Cestode infections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance.
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Cestodes change the isotopic signature of brine shrimp artemia hosts implications for aquatic food webs
International Journal for Parasitology, 2013Co-Authors: Marta I Sanchez, Nico Varo, Cristina Matesanz, Cristina Ramo, Juan A Amat, Andy J GreenAbstract:Abstract To reach the final host (greater flamingos), the Cestode Flamingolepis liguloides alters the behaviour of its intermediate host, the brine shrimp, Artemia parthenogenetica , causing it to spend more time close to the water surface. During summer 2010, we showed that the prevalence of this Cestode was consistently higher at the top of the water column in the Odiel salt pans in south-western Spain. We used stable nitrogen (N) and carbon (C) isotopic analysis to test the hypothesis that Cestodes also alter resource use by Artemia . In early summer, we compared stable isotopes in infected hosts at the surface with those from uninfected hosts at the bottom of the water column. In late summer, we compared infected and uninfected Artemia from the bottom. δ 15 N was consistently enriched in infected individuals compared with uninfected hosts, especially in Artemia with multiple infections of F. liguloides (family Hymenolepididae) and those with mixed infections of F. liguloides and Cestodes of the family Dilepididae. Infected individuals from the surface were enriched in δ 13 C compared with uninfected ones from the bottom, but the opposite was found when comparing uninfected and infected Artemia from the same depth. This may be caused by the increase in lipid concentration in infected Artemia . Isolated cysticercoids of F. liguloides were significantly enriched in δ 13 C compared with cysticercoids in infected hosts, but surprisingly were not enriched in N. Our findings illustrate the way Cestodes can alter food webs and highlight the importance of considering the parasitic status of prey in studies of trophic ecology in saline wetlands.
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Cestode parasitism in invasive and native brine shrimps artemia spp as a possible factor promoting the rapid invasion of a franciscana in the mediterranean region
Parasitology Research, 2007Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Artemia franciscana is an invasive crustacean expanding its range in hypersaline wetlands in the Mediterranean region and replacing native Artemia parthenogenetica and Artemia salina. Native brine shrimps are known as intermediate hosts of Cestodes; infected individuals exhibit changes in their behaviour and appearance, thus facilitating the parasite transmission to the avian hosts by predation. To assess whether invasive brine shrimps participate in the Cestode life cycles to the same extent as the native species, we examined the natural infections in seven populations of Artemia spp. along the southern coast of Spain and Portugal: three populations of each A. franciscana and A. parthenogenetica and one population of A. salina. Ten Cestode species were found in A. parthenogenetica, while only six were recorded in each of A. salina and A. franciscana. The overall infection was consistently higher in native than in invasive populations. For a particular Cestode species, the prevalence or abundance was significantly higher in a native population for 54 pairwise comparisons and only higher for an invasive population for 4 pairwise comparisons. These results suggest that Cestodes may influence competitive interactions between native and invasive brine shrimps, thus partly explaining the invasive success of A. franciscana.
Andy J Green - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL PAPER High prevalence of Cestodes in Artemia spp. throughout the annual cycle: relationship with abundance of avian final hosts
2016Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Abstract Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almería. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness=0.26), compared to 27–72 % of A. salina (mean species richness=0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal varia-tion in prevalence, abundance, and intensity of Cestode in-fections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance
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comparing Cestode infections and their consequences for host fitness in two sexual branchiopods alien artemia franciscana and native a salina from syntopic populations
PeerJ, 2015Co-Authors: Stella Redon, Francisco Amat, Marta I Sanchez, Andy J GreenAbstract:The American brine shrimp Artemia franciscana is invasive in the Mediterranean region where it has displaced native species (the sexual A. salina, and the clonal A. parthenogenetica) from many salt pond complexes. Artemia populations are parasitized by numerous avian Cestodes whose effects have been studied in native species. We present a study from the Ebro Delta salterns (NE Spain), in a salt pond where both A. franciscana and native A. salina populations coexist, providing a unique opportunity to compare the parasite loads of the two sexual species in syntopy. The native species had consistently higher infection parameters, largely because the dominant Cestode in A. salina adults and juveniles (Flamingolepis liguloides) was much rarer in A. franciscana. The most abundant Cestodes in the alien species were Eurycestus avoceti (in adults) and Flamingolepis flamingo (in juveniles). The abundance of E. avoceti and F. liguloides was higher in the A. franciscana population syntopic with A. salina than in a population sampled at the same time in another pond where the native brine shrimp was absent, possibly because the native shrimp provides a better reservoir for parasite circulation. Infection by Cestodes caused red colouration in adult and juvenile A. salina, and also led to castration in a high proportion of adult females. Both these effects were significantly stronger in the native host than in A. franciscana with the same parasite loads. However, for the first time, significant castration effects (for E. avoceti and F. liguloides) and colour change (for six Cestode species) were observed in infected A. franciscana. Avian Cestodes are likely to help A. franciscana outcompete native species. At the same time, they are likely to reduce the production of A. franciscana cysts in areas where they are harvested commercially.
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influence of developmental stage and sex on infection of the american brine shrimp artemia franciscana kellogg 1906 by avian Cestodes in ebro delta salterns spain
Aquatic Invasions, 2015Co-Authors: Stella Redon, Andy J Green, Boyko B Georgiev, Gergana P Vasileva, Francisco AmatAbstract:The American brine shrimp Artemia franciscana Kellogg, 1906 is invasive in the Mediterranean region where it has displaced native populations of sexual A. salina and clonal A. parthenogenetica from many hypersaline wetlands. Brine shrimps are intermediate hosts of several cyclophyllidean avian Cestodes, whose effects have been studied in native Artemia. However, determinants of these infections in the alien invader remain unknown. We present the most detailed study to date of parasitism of A. franciscana by Cestodes in its invasive range, conducted in the Ebro Delta salterns (NE Spain) over a 33 month period, when a total of 9,293 A. franciscana adults and 8,902 juveniles were studied. We examined for first time whether host age and sex influence infection rates. Ten Cestode species were recorded, with a total prevalence of 11.1% in adults and 2.7% in juveniles. The most abundant Cestodes were Eurycestus avoceti (in adults) and Flamingolepis flamingo (in juveniles). Prevalence, abundance and intensity of infection were significantly higher in adults for four Cestode species (Flamingolepis liguloides , Wardium stellorae, E. avoceti and Anomotaenia microphallos), and significantly higher in juveniles for F. flamingo. Mean Cestode species richness was four times higher in adults. One Cestode species (F. liguloides), was significantly more abundant in adult females than in adult males. Host age influences infection patterns which seem to be strongly related to the feeding behaviour of avian final hosts (filtering versus picking), suggesting complex ecological interactions among predators, prey and their parasites, with important implications for native biodiversity and ecosystem stability.
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high prevalence of Cestodes in artemia spp throughout the annual cycle relationship with abundance of avian final hosts
Parasitology Research, 2013Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almeria. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness = 0.26), compared to 27–72 % of A. salina (mean species richness = 0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal variation in prevalence, abundance, and intensity of Cestode infections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance.
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Cestodes change the isotopic signature of brine shrimp artemia hosts implications for aquatic food webs
International Journal for Parasitology, 2013Co-Authors: Marta I Sanchez, Nico Varo, Cristina Matesanz, Cristina Ramo, Juan A Amat, Andy J GreenAbstract:Abstract To reach the final host (greater flamingos), the Cestode Flamingolepis liguloides alters the behaviour of its intermediate host, the brine shrimp, Artemia parthenogenetica , causing it to spend more time close to the water surface. During summer 2010, we showed that the prevalence of this Cestode was consistently higher at the top of the water column in the Odiel salt pans in south-western Spain. We used stable nitrogen (N) and carbon (C) isotopic analysis to test the hypothesis that Cestodes also alter resource use by Artemia . In early summer, we compared stable isotopes in infected hosts at the surface with those from uninfected hosts at the bottom of the water column. In late summer, we compared infected and uninfected Artemia from the bottom. δ 15 N was consistently enriched in infected individuals compared with uninfected hosts, especially in Artemia with multiple infections of F. liguloides (family Hymenolepididae) and those with mixed infections of F. liguloides and Cestodes of the family Dilepididae. Infected individuals from the surface were enriched in δ 13 C compared with uninfected ones from the bottom, but the opposite was found when comparing uninfected and infected Artemia from the same depth. This may be caused by the increase in lipid concentration in infected Artemia . Isolated cysticercoids of F. liguloides were significantly enriched in δ 13 C compared with cysticercoids in infected hosts, but surprisingly were not enriched in N. Our findings illustrate the way Cestodes can alter food webs and highlight the importance of considering the parasitic status of prey in studies of trophic ecology in saline wetlands.
Boyko B Georgiev - One of the best experts on this subject based on the ideXlab platform.
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Exploring parasites in extreme environments of high conservational importance: Artemia franciscana (Crustacea: Branchiopoda) as intermediate host of avian Cestodes in Andean hypersaline lagoons from Salar de Atacama, Chile
Parasitology Research, 2020Co-Authors: Stella Redon, Boyko B Georgiev, Gergana P Vasileva, Gonzalo GajardoAbstract:The hypersaline lagoons located in evaporation basins or salars (salt flats) in the Atacama Desert are extreme environments harbouring a specialised biota able to survive harsh conditions for life. The knowledge of the parasitic biodiversity of these extreme habitats is still scarce despite their functional importance in regulating relevant non-economic services like habitats of waterbirds. The present study is the first report on the Cestode infection of Artemia franciscana Kellogg in Salar de Atacama lagoons in northern Chile. A total of 23 parasite larvae were isolated and identified as belonging to five Cestode taxa of the order Cyclophyllidea: two species of the family Hymenolepididae, i.e. Flamingolepis sp. 1 and Flamingolepis sp. 2 (adults parasitic in flamingos); two species of Dilepididae, i.e. Fuhrmannolepis averini (adults parasitic in phalaropes) and Eurycestus avoceti (adult parasitic in charadriforms birds); and one species of Progynotaeniidae, i.e. Gynandrotaenia (?) stammeri (adult parasitic in flamingos). The cysticercoids of each species are described and figured. The study represents the first geographical record of the genera Eurycestus , Gynandrotaenia and Fuhrmannolepis in South America and the first report of Gynandrotaenia and Flamingolepis in A. franciscana in its native range. This survey also contributes to the knowledge of Cestodes of Phoenicopteriformes and Charadriiformes and their life cycles in the Neotropical Region. A review of Cestodes recorded in brine shrimps of the genus Artemia in the world is provided. Further studies on Cestode fauna of aquatic birds and their intermediate hosts in hypersaline habitats of the Neotropical Region are needed to understand their functional role in such extreme and unique ecosystems.
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ORIGINAL PAPER High prevalence of Cestodes in Artemia spp. throughout the annual cycle: relationship with abundance of avian final hosts
2016Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Abstract Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almería. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness=0.26), compared to 27–72 % of A. salina (mean species richness=0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal varia-tion in prevalence, abundance, and intensity of Cestode in-fections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance
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influence of developmental stage and sex on infection of the american brine shrimp artemia franciscana kellogg 1906 by avian Cestodes in ebro delta salterns spain
Aquatic Invasions, 2015Co-Authors: Stella Redon, Andy J Green, Boyko B Georgiev, Gergana P Vasileva, Francisco AmatAbstract:The American brine shrimp Artemia franciscana Kellogg, 1906 is invasive in the Mediterranean region where it has displaced native populations of sexual A. salina and clonal A. parthenogenetica from many hypersaline wetlands. Brine shrimps are intermediate hosts of several cyclophyllidean avian Cestodes, whose effects have been studied in native Artemia. However, determinants of these infections in the alien invader remain unknown. We present the most detailed study to date of parasitism of A. franciscana by Cestodes in its invasive range, conducted in the Ebro Delta salterns (NE Spain) over a 33 month period, when a total of 9,293 A. franciscana adults and 8,902 juveniles were studied. We examined for first time whether host age and sex influence infection rates. Ten Cestode species were recorded, with a total prevalence of 11.1% in adults and 2.7% in juveniles. The most abundant Cestodes were Eurycestus avoceti (in adults) and Flamingolepis flamingo (in juveniles). Prevalence, abundance and intensity of infection were significantly higher in adults for four Cestode species (Flamingolepis liguloides , Wardium stellorae, E. avoceti and Anomotaenia microphallos), and significantly higher in juveniles for F. flamingo. Mean Cestode species richness was four times higher in adults. One Cestode species (F. liguloides), was significantly more abundant in adult females than in adult males. Host age influences infection patterns which seem to be strongly related to the feeding behaviour of avian final hosts (filtering versus picking), suggesting complex ecological interactions among predators, prey and their parasites, with important implications for native biodiversity and ecosystem stability.
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high prevalence of Cestodes in artemia spp throughout the annual cycle relationship with abundance of avian final hosts
Parasitology Research, 2013Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almeria. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness = 0.26), compared to 27–72 % of A. salina (mean species richness = 0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal variation in prevalence, abundance, and intensity of Cestode infections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance.
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Cestode parasitism in invasive and native brine shrimps artemia spp as a possible factor promoting the rapid invasion of a franciscana in the mediterranean region
Parasitology Research, 2007Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Artemia franciscana is an invasive crustacean expanding its range in hypersaline wetlands in the Mediterranean region and replacing native Artemia parthenogenetica and Artemia salina. Native brine shrimps are known as intermediate hosts of Cestodes; infected individuals exhibit changes in their behaviour and appearance, thus facilitating the parasite transmission to the avian hosts by predation. To assess whether invasive brine shrimps participate in the Cestode life cycles to the same extent as the native species, we examined the natural infections in seven populations of Artemia spp. along the southern coast of Spain and Portugal: three populations of each A. franciscana and A. parthenogenetica and one population of A. salina. Ten Cestode species were found in A. parthenogenetica, while only six were recorded in each of A. salina and A. franciscana. The overall infection was consistently higher in native than in invasive populations. For a particular Cestode species, the prevalence or abundance was significantly higher in a native population for 54 pairwise comparisons and only higher for an invasive population for 4 pairwise comparisons. These results suggest that Cestodes may influence competitive interactions between native and invasive brine shrimps, thus partly explaining the invasive success of A. franciscana.
Pavel N Nikolov - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL PAPER High prevalence of Cestodes in Artemia spp. throughout the annual cycle: relationship with abundance of avian final hosts
2016Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Abstract Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almería. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness=0.26), compared to 27–72 % of A. salina (mean species richness=0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal varia-tion in prevalence, abundance, and intensity of Cestode in-fections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance
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high prevalence of Cestodes in artemia spp throughout the annual cycle relationship with abundance of avian final hosts
Parasitology Research, 2013Co-Authors: Boyko B Georgiev, Gergana P Vasileva, Marta I Sanchez, Pavel N Nikolov, Darina D. Georgieva, Plamen Pankov, Mariano Paracuellos, Kevin D. Lafferty, Andy J GreenAbstract:Brine shrimp, Artemia spp., act as intermediate hosts for a range of Cestode species that use waterbirds as their final hosts. These parasites can have marked influences on shrimp behavior and fecundity, generating the potential for cascading effects in hypersaline food webs. We present the first comprehensive study of the temporal dynamics of Cestode parasites in natural populations of brine shrimp throughout the annual cycle. Over a 12-month period, clonal Artemia parthenogenetica were sampled in the Odiel marshes in Huelva, and the sexual Artemia salina was sampled in the Salinas de Cerrillos in Almeria. Throughout the year, 4–45 % of A. parthenogenetica were infected with Cestodes (mean species richness = 0.26), compared to 27–72 % of A. salina (mean species richness = 0.64). Ten Cestode species were recorded. Male and female A. salina showed similar levels of parasitism. The most prevalent and abundant Cestodes were those infecting the most abundant final hosts, especially the Greater Flamingo Phoenicopterus ruber. In particular, the flamingo parasite Flamingolepis liguloides had a prevalence of up to 43 % in A. parthenogenetica and 63.5 % in A. salina in a given month. Although there was strong seasonal variation in prevalence, abundance, and intensity of Cestode infections, seasonal changes in bird counts were weak predictors of the dynamics of Cestode infections. However, infection levels of Confluaria podicipina in A. parthenogenetica were positively correlated with the number of their black-necked grebe Podiceps nigricollis hosts. Similarly, infection levels of Anomotaenia tringae and Anomotaenia microphallos in A. salina were correlated with the number of shorebird hosts present the month before. Correlated seasonal transmission structured the Cestode community, leading to more multiple infections than expected by chance.
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Cestode parasitism in invasive and native brine shrimps artemia spp as a possible factor promoting the rapid invasion of a franciscana in the mediterranean region
Parasitology Research, 2007Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Artemia franciscana is an invasive crustacean expanding its range in hypersaline wetlands in the Mediterranean region and replacing native Artemia parthenogenetica and Artemia salina. Native brine shrimps are known as intermediate hosts of Cestodes; infected individuals exhibit changes in their behaviour and appearance, thus facilitating the parasite transmission to the avian hosts by predation. To assess whether invasive brine shrimps participate in the Cestode life cycles to the same extent as the native species, we examined the natural infections in seven populations of Artemia spp. along the southern coast of Spain and Portugal: three populations of each A. franciscana and A. parthenogenetica and one population of A. salina. Ten Cestode species were found in A. parthenogenetica, while only six were recorded in each of A. salina and A. franciscana. The overall infection was consistently higher in native than in invasive populations. For a particular Cestode species, the prevalence or abundance was significantly higher in a native population for 54 pairwise comparisons and only higher for an invasive population for 4 pairwise comparisons. These results suggest that Cestodes may influence competitive interactions between native and invasive brine shrimps, thus partly explaining the invasive success of A. franciscana.
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Red and transparent brine shrimps (Artemia parthenogenetica): a comparative study of their Cestode infections.
Parasitology research, 2006Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Although the red colour of brine shrimps has previously been supposed to be associated with Cestode parasitism, no evidence has been provided that red and transparent brine shrimps differ in their role for Cestode circulation. We compared the Cestode infections in 100 red and 100 transparent Artemia parthenogenetica collected from the Odiel salt pans in Spain. Seven Cestode species were recorded in red, and only four of them were recorded in transparent brine shrimps. The red brine shrimps were more infected with cysticercoids than transparent individuals (prevalence, 87 vs 21%; mean intensity, 1.56 vs 1.00; mean abundance, 1.35 vs 0.21). Three Cestode species (Flamingolepis liguloides, Anomotaenia tringae and Confluaria podicipina) had significantly higher prevalence and mean abundance in red brine shrimps. These results suggest that red brine shrimps have a more important role for the circulation of avian Cestodes than transparent individuals of the same population.
Gergana G Vasileva - One of the best experts on this subject based on the ideXlab platform.
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Cestode parasitism in invasive and native brine shrimps artemia spp as a possible factor promoting the rapid invasion of a franciscana in the mediterranean region
Parasitology Research, 2007Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Artemia franciscana is an invasive crustacean expanding its range in hypersaline wetlands in the Mediterranean region and replacing native Artemia parthenogenetica and Artemia salina. Native brine shrimps are known as intermediate hosts of Cestodes; infected individuals exhibit changes in their behaviour and appearance, thus facilitating the parasite transmission to the avian hosts by predation. To assess whether invasive brine shrimps participate in the Cestode life cycles to the same extent as the native species, we examined the natural infections in seven populations of Artemia spp. along the southern coast of Spain and Portugal: three populations of each A. franciscana and A. parthenogenetica and one population of A. salina. Ten Cestode species were found in A. parthenogenetica, while only six were recorded in each of A. salina and A. franciscana. The overall infection was consistently higher in native than in invasive populations. For a particular Cestode species, the prevalence or abundance was significantly higher in a native population for 54 pairwise comparisons and only higher for an invasive population for 4 pairwise comparisons. These results suggest that Cestodes may influence competitive interactions between native and invasive brine shrimps, thus partly explaining the invasive success of A. franciscana.
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Red and transparent brine shrimps (Artemia parthenogenetica): a comparative study of their Cestode infections.
Parasitology research, 2006Co-Authors: Marta I Sanchez, Boyko B Georgiev, Gergana G Vasileva, Pavel N Nikolov, Andy J GreenAbstract:Although the red colour of brine shrimps has previously been supposed to be associated with Cestode parasitism, no evidence has been provided that red and transparent brine shrimps differ in their role for Cestode circulation. We compared the Cestode infections in 100 red and 100 transparent Artemia parthenogenetica collected from the Odiel salt pans in Spain. Seven Cestode species were recorded in red, and only four of them were recorded in transparent brine shrimps. The red brine shrimps were more infected with cysticercoids than transparent individuals (prevalence, 87 vs 21%; mean intensity, 1.56 vs 1.00; mean abundance, 1.35 vs 0.21). Three Cestode species (Flamingolepis liguloides, Anomotaenia tringae and Confluaria podicipina) had significantly higher prevalence and mean abundance in red brine shrimps. These results suggest that red brine shrimps have a more important role for the circulation of avian Cestodes than transparent individuals of the same population.