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M D Pizay - One of the best experts on this subject based on the ideXlab platform.
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Dynamics of core and occasional species in the marine plankton: Tintinnid ciliates in the north-west Mediterranean Sea
Journal of Biogeography, 2009Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, M D PizayAbstract:Abstract Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15% of the population, were found. Species richness of the occasionals was positively related to population size. The identities of the occasional species found were unrelated to the time between sampling. The species abundance distribution of the occasional population was best fit by a log-series distribution, while that of the core species was best fit by a log-normal distribution. The species abundance distribution of the Entire Community was best fit by a log-series distribution. Most of the occasional species had LODs distinct from that of a core species and occupied size classes left empty by the core population. However, the most abundant and frequent of the occasional species had a LOD similar to that of a core species. Main conclusions Among tintinnids, which are planktonic protists, occasional species have a species abundance distribution pattern distinct from that of core species. Occasional species appeared to be composed of two groups, one of relatively abundant species and similar to core species, and a second group of ephemeral species with morphologies distinct from core species. The existence of two categories of occasional or rare species may be common: (1) those similar to, and thus perhaps able to replace, dominant species in the absence of a change in the environment; and (2) those distinct from dominant species and requiring different conditions to prosper.
John R. Dolan - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL ARTICLE Dynamics of core and occasional species in the marine plankton: tintinnid ciliates in the north-west Mediterranean Sea
2015Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, Correspondence John R. DolanAbstract:Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15 % of the population, were found. Species richness of th
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Dynamics of core and occasional species in the marine plankton: Tintinnid ciliates in the north-west Mediterranean Sea
Journal of Biogeography, 2009Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, M D PizayAbstract:Abstract Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15% of the population, were found. Species richness of the occasionals was positively related to population size. The identities of the occasional species found were unrelated to the time between sampling. The species abundance distribution of the occasional population was best fit by a log-series distribution, while that of the core species was best fit by a log-normal distribution. The species abundance distribution of the Entire Community was best fit by a log-series distribution. Most of the occasional species had LODs distinct from that of a core species and occupied size classes left empty by the core population. However, the most abundant and frequent of the occasional species had a LOD similar to that of a core species. Main conclusions Among tintinnids, which are planktonic protists, occasional species have a species abundance distribution pattern distinct from that of core species. Occasional species appeared to be composed of two groups, one of relatively abundant species and similar to core species, and a second group of ephemeral species with morphologies distinct from core species. The existence of two categories of occasional or rare species may be common: (1) those similar to, and thus perhaps able to replace, dominant species in the absence of a change in the environment; and (2) those distinct from dominant species and requiring different conditions to prosper.
Esperanza Rodriguez - One of the best experts on this subject based on the ideXlab platform.
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epidemiology of intestinal helminthiases in a rural Community of ethiopia is it time to expand control programs to include strongyloides stercoralis and the Entire Community
PLOS Neglected Tropical Diseases, 2020Co-Authors: Aranzazu Amor Aramendia, Melaku Anegagrie, Derjew Zewdie, Elena Dacal, Jose Maria Saugar, Zaida Herrador, Tadesse Hailu, Mulat Yimer, Maria Victoria Periago, Esperanza RodriguezAbstract:Background Soil transmitted helminths are highly prevalent worldwide. Globally, approximately 1.5 billion people are infected with Ascaris lumbricoides, Trichuris trichiura or hookworm. Endemic countries carry out periodic mass treatment of at-risk populations with albendazole or mebendazole as a control measure. Most prevalence studies have focused on school aged children and therefore control programs are implemented at school level, not at Community level. In this study, the prevalence of intestinal helminths, including Strongyloides stercoralis, was examined using a comprehensive laboratory approach in a Community in north-western Ethiopia. Methods A cross-sectional survey was conducted on 792 individuals ≥5 years old in randomly selected houses in a rural district. Stools were examined using three techniques: a formol-ether concentration, the Baermann technique and a real time polymerase chain reaction test (these last two specific for S. stercoralis). Statistical analyses were performed between two large age groups, children (≤14 years old) and adults (≥15 years old). Results The prevalence of helminths was 91.3%; (95% CI: 89.3–93.3%). Hookworm was the most prevalent, 78.7% (95% CI 75.6–81.4%), followed by S. stercoralis 55.7% (95% CI 52.2–59.1%). Co-infection with both was detected in 45.4% (95% CI 42.0–49.0%) of the participants. The mean age of hookworm-infected individuals was significantly higher than non-infected ones (p = 0.003). Also, S. stercoralis infection was significantly associated with age, being more prevalent in adults (p = 0.002). Conclusions This is the highest prevalence of S. stercoralis detected in Ethiopia so far. Our results highlight the need of searching specifically for infection by this parasite since it usually goes unnoticed if helminth studies rely only on conventional diagnostic techniques, i.e. Kato-Katz. Moreover, the focus of these programs on children undermines the actual prevalence of hookworm. The adult population acts as a reservoir for both hookworm and S. stercoralis and this fact may negatively impact the current control programs in Ethiopia which only target treatment of school aged children. This reservoir, together with a lack of adequate water, sanitation and hygiene, increases the probability of re-infection in children. Finally, the high prevalence of S. stercoralis found calls for a comprehensive diagnostic approach in endemic areas in addition to a revision of control measures that is, adding ivermectin to current albendazole/mebendazole, since it is the drug of choice for S. stercoralis.
Alina Tunin-ley - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL ARTICLE Dynamics of core and occasional species in the marine plankton: tintinnid ciliates in the north-west Mediterranean Sea
2015Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, Correspondence John R. DolanAbstract:Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15 % of the population, were found. Species richness of th
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Dynamics of core and occasional species in the marine plankton: Tintinnid ciliates in the north-west Mediterranean Sea
Journal of Biogeography, 2009Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, M D PizayAbstract:Abstract Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15% of the population, were found. Species richness of the occasionals was positively related to population size. The identities of the occasional species found were unrelated to the time between sampling. The species abundance distribution of the occasional population was best fit by a log-series distribution, while that of the core species was best fit by a log-normal distribution. The species abundance distribution of the Entire Community was best fit by a log-series distribution. Most of the occasional species had LODs distinct from that of a core species and occupied size classes left empty by the core population. However, the most abundant and frequent of the occasional species had a LOD similar to that of a core species. Main conclusions Among tintinnids, which are planktonic protists, occasional species have a species abundance distribution pattern distinct from that of core species. Occasional species appeared to be composed of two groups, one of relatively abundant species and similar to core species, and a second group of ephemeral species with morphologies distinct from core species. The existence of two categories of occasional or rare species may be common: (1) those similar to, and thus perhaps able to replace, dominant species in the absence of a change in the environment; and (2) those distinct from dominant species and requiring different conditions to prosper.
Mark E Ritchie - One of the best experts on this subject based on the ideXlab platform.
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ORIGINAL ARTICLE Dynamics of core and occasional species in the marine plankton: tintinnid ciliates in the north-west Mediterranean Sea
2015Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, Correspondence John R. DolanAbstract:Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15 % of the population, were found. Species richness of th
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Dynamics of core and occasional species in the marine plankton: Tintinnid ciliates in the north-west Mediterranean Sea
Journal of Biogeography, 2009Co-Authors: John R. Dolan, Alina Tunin-ley, Mark E Ritchie, M D PizayAbstract:Abstract Aim To assess short-term variability in the Community composition and Community structure of tintinnid ciliates, herbivores of the microzooplankton. Location North-west Mediterranean Sea. Methods We sampled on 18 dates over a 4-week period in 2004 at an open-water site. Species were classified as ‘core species’, found on every date, or ‘occasional species’, absent on one or more dates. Species abundance distributions of the Entire Community, and separately the core and occasional species, were compared with geometric, log-series and log-normal distributions. Core and occasional species were compared in terms of the shell or lorica oral diameter (LOD), analogous to gape size. Results We found 11 core and 49 occasional species. Diversity metrics were stable compared with shifts in abundances. Core species accounted for the majority of individuals in all samples. On each date, 9–22 occasional species, representing 10–15% of the population, were found. Species richness of the occasionals was positively related to population size. The identities of the occasional species found were unrelated to the time between sampling. The species abundance distribution of the occasional population was best fit by a log-series distribution, while that of the core species was best fit by a log-normal distribution. The species abundance distribution of the Entire Community was best fit by a log-series distribution. Most of the occasional species had LODs distinct from that of a core species and occupied size classes left empty by the core population. However, the most abundant and frequent of the occasional species had a LOD similar to that of a core species. Main conclusions Among tintinnids, which are planktonic protists, occasional species have a species abundance distribution pattern distinct from that of core species. Occasional species appeared to be composed of two groups, one of relatively abundant species and similar to core species, and a second group of ephemeral species with morphologies distinct from core species. The existence of two categories of occasional or rare species may be common: (1) those similar to, and thus perhaps able to replace, dominant species in the absence of a change in the environment; and (2) those distinct from dominant species and requiring different conditions to prosper.