The Experts below are selected from a list of 3486 Experts worldwide ranked by ideXlab platform
Kai Horst George - One of the best experts on this subject based on the ideXlab platform.
-
oceanic islands and seamounts as staging posts for copepoda Harpacticoida crustacea shallow water paramesochridae lang 1944 from the north east atlantic ocean including the re description of three species and one subspecies from the madeiran archipel
Progress in Oceanography, 2015Co-Authors: Jana Packmor, Florian Muller, Kai Horst GeorgeAbstract:Abstract Despite the apparent restriction in their dispersal potential due to their holobenthic lifestyle and associated morphological adaptations, several species of Paramesochridae (Copepoda, Harpacticoida) occur at multiple shallow-water locations separated by 1000s of kilometres, a phenomenon known as the “meiofauna paradox”. In this context it is thought that seamounts located within a critical dispersion distance from a shallow-water habitat play an important role as staging posts, supporting meiobenthic steady-state dispersion, assuming they provide similar environmental conditions to the coastal habitats. To achieve a more complete understanding of the distribution of meiofaunal assemblages, a thorough investigation of the meiofauna of adjacent seamounts, islands, continental coastlines and surrounding deep-sea areas is necessary. A comprehensive investigation of the harpacticoid fauna of seamounts and islands in the northeast Atlantic Ocean was therefore undertaken, the Portuguese islands Madeira and Porto Santo were studied quantitatively and the material was compared with that from the seamounts Seine, Sedlo and Great Meteor. Fourteen species of Paramesochridae were recorded from the Madeiran Archipelago, of which five were already known to science and two were assumed to be new subspecies of already known species. The remaining seven species (50%) are as yet unknown. A comparison of the Paramesochridae from the Madeiran Archipelago with those of the seamounts Seine, Sedlo and Great Meteor revealed several species which occurred at multiple locations. Our review of the geographical distribution of the paramesochrid species revealed that five species had been previously reported from shallow-water regions in Europe, the Mediterranean, and even from the western coast of South and Central America (Pacific Ocean). Thus the presence of these taxa on the Atlantic seamounts and islands seems to link their formerly disjunct distribution. We conclude that the data presented here provide evidence for the hypothetical role of seamounts and oceanic islands as staging posts for at least some harpacticoid species. In addition, we describe two new species of Paramesochridae, Apodopsyllus seixalensis sp. nov. and Apodopsyllus puetzorum sp. nov., and one subspecies, Apodopsyllus africanus madeirensis ssp. nov., and redescribe Emertonia miguelensis .
-
community structure and species diversity of Harpacticoida crustacea copepoda at two sites in the deep sea of the angola basin southeast atlantic
Organisms Diversity & Evolution, 2014Co-Authors: Kai Horst George, Armin Rose, Sybille Seifried, Elke Willen, Karin Bröhldick, Jan Drewes, Pedro Martínez Arbizu, Gritta Veitkohler, Paulo H. C. Corgosinho, Lena MenzelAbstract:The aim of this study was to evaluate compositional differences between harpacticoid (Crustacea, Copepoda) assemblages at two widely separated abyssal locations. During the DIVA 1 cruise of RV METEOR (July/August 2000) to the Angola Basin (Southeast Atlantic), two deep-sea stations, approximately 300 nautical miles apart (Stations 325 and 346), were sampled repeatedly by Multicorer (MUC). For quantitative analyses, 5 MUC samples were selected at random from each of 15 deployments at both stations, totalling 75 cores. Across the study, 7,081 Harpacticoida specimens were encountered and of these 31.4 % were adults and could be analysed to species level: 682 species were identified, with 99.3 % new to science. At northern Station 346, a total of 600 species were recorded—the highest harpacticoid species number ever recorded for a single deep-sea locality. Most species (56 %) were represented by singletons. Multivariate tests identified significant differences between community compositions at the two stations. Diversity, species richness and species density were higher at Station 346, whilst taxonomic distinctness, evenness, and rarefaction were similar between stations. Regression and correlation analyses showed that the difference in species diversity was best explained by species densities rather than species richness. Under-sampling due to low densities was an issue at the southern Station 325. Nevertheless, our study demonstrated significant differences in regional-scale harpacticoid community structures within a single deep-sea basin that would usually be considered a uniform and stable habitat. These observed differences are thought to reflect differences in food availability at the two stations.
-
A new species of Ancorabolidae (Crustacea: Copepoda: Harpacticoida) from the Campos Basin, Brazil, including a phylogenetic review of the taxon Polyascophorus George, 1998, and a key to its species
Zoologischer Anzeiger - A Journal of Comparative Zoology, 2013Co-Authors: Kai Horst George, Adriane P. Wandeness, Paulo J. P. SantosAbstract:A new species of the genus Polyascophorus George, 1998 (Copepoda, Harpacticoida, Ancorabolidae), collected from the Grussai Canyon (Campos Basin, Brazil, South Atlantic), is described in the present con
-
submarine ridges do not prevent large scale dispersal of abyssal fauna a case study of mesocletodes crustacea copepoda Harpacticoida
EPIC3Deep-Sea Research Part I-Oceanographic Research Papers PERGAMON-ELSEVIER SCIENCE LTD 58(8) pp. 839-864 ISSN: 0967-0637, 2011Co-Authors: Lena Menzel, Kai Horst George, Pedro Martínez ArbizuAbstract:Abstract We examined the large-scale distribution of deep-sea harpacticoid copepods at the species level, in order to clarify the underlying processes of copepod dispersal. The study was based on samples collected from 12 regions and a total of 113 stations: 57 stations at depths between 1107 and 5655 m on abyssal plains in the South and North Atlantic, Southern Ocean, southern Indian Ocean, and the Pacific Ocean, and 56 stations above 900 m in the North Atlantic and eastern Mediterranean Sea. We chose the genus Mesocletodes Sars, 1909 as an ideal group to study the large-scale distribution of harpacticoid copepods in the deep oceans. Clear apomorphies and a comparatively large body size of about 1 mm allow rapid recognition of allied species in meiofauna samples. In addition, Mesocletodes represents more than 50% of the family Argestidae Por, 1986 , one of the most abundant harpacticoid families in the deep sea. The geographical distributions of 793 adult females of Mesocletodes belonging to 61 species throughout the South and North Atlantic, Southern Ocean, southern Indian Ocean, Pacific Ocean, and eastern Mediterranean Sea indicated that most species are cosmopolitan. Neither the topography of the sea bottom nor long distances seem to prevent species from dispersing. Passive transport by bottom currents after resuspension is likely the propulsive factor for the dispersal of Harpacticoida, while plate tectonics and movement of individuals in the sediment may play relatively minor roles.
-
Community analysis of sublittoral Harpacticoida (Copepoda, Crustacea) in the western Baltic Sea
Hydrobiologia, 2010Co-Authors: Christina Folkers, Kai Horst GeorgeAbstract:This study compares two stations each sampled at the Oresund (Denmark) and the German coast (western Baltic Sea), with respect to sublittoral Harpacticoida. The associations were found to differ considerably in diversity, species numbers, evenness and also in the species composition. At the two northern stations, mainly polyhaline species were found and they showed the highest species and individual numbers as well as the most even species distribution. At the two southern stations, mainly pleiomesohaline species were found and they were dominated by one species that was very resistant to eutrophication, so that they showed an uneven species distribution, but also had lower individual numbers and thus lower diversity. Some samples at the German coast were found to have an extremely low harpacticoid number, which was attributed to the severe oxygen deficiency that occurred in autumn 2002 in the western Baltic Sea. This can also be considered to be the main reason for the low species diversity of the southern stations.
Hendrik Gheerardyn - One of the best experts on this subject based on the ideXlab platform.
-
Harpacticoida (Crustacea: Copepoda) of the South China Sea: faunistic and biogeographical analysis
Hydrobiologia, 2010Co-Authors: E. S. Chertoprud, Hendrik Gheerardyn, Samuel GómezAbstract:Based on original and on published databases, a compendium of the Harpacticoida of the South China Sea is presented, and the distributional range of species is discussed. Up to now, a total of 77 harpacticoid species belonging to 57 genera and 19 families have been recorded in this region. Twenty of these species, collected in Nha-Trang Bay (Vietnam), have not hitherto been described. The most speciose families are the Miraciidae (20 species) and the Laophontidae (9 species). Thirteen families were represented by one to three species only and six families by four to seven species. A brief comparison is presented between the harpacticoid fauna of the South China Sea, the Philippine Islands, the inner Malayan Archipelago (Java, Flores, Banda, and Celebes Seas), New Guinea, the Yellow Sea, and the Andaman and Nicobar Islands. The overall similarity between the species lists of these areas was observed to be extremely low (average value of Simpson index is 0.15 ± 0.08). The lists of planktonic species from the different areas showed the highest similarity. The lowest similarity (highest endemism) was observed between the lists of interstitial species. It is likely that one of the factors determining the differences between the faunas is the poor knowledge about the composition and distribution of benthic harpacticoids in tropical latitudes.
-
diversity and large scale biogeography of paramesochridae copepoda Harpacticoida in south atlantic abyssal plains and the deep southern ocean
Deep Sea Research Part I: Oceanographic Research Papers, 2009Co-Authors: Hendrik Gheerardyn, Gritta VeitkohlerAbstract:Multicorer samples for meiofaunal study were obtained within the framework of the international project CeDAMar, at 21 stations occupied during the DIVA and ANDEEP campaigns (2000, 2002 and 2005) to the southern Atlantic Ocean (Guinea, Angola and Cape Basins) and the Southern Ocean (Weddell and Scotia Seas), respectively. A total of 311 adult Paramesochridae Lang, 1944 (Copepoda, Harpacticoida) was extracted from 437 cores obtained during 83 deployments of the corer at depths between 1107 and 5655 m. All specimens were determined to species based on morphological characteristics. They belonged to 19 species and four genera (Kliopsyllus Kunz, 1962, Leptopsyllus T. Scott, 1894, Paramesochra T. Scott, 1892 and Scottopsyllus Kunz, 1962). Eleven species were restricted to single regions, whereas the others showed a much wider distribution. For example, Kliopsyllus andeep Veit-Kohler, 2004 and Kliopsyllus diva Veit-Kohler, 2005, were both collected from Guinea, Angola and Weddell Abyssal Plains, and Kliopsyllus schminkei Veit-Kohler & Drewes, 2009 occurred in the three West-African basins. This study provides a first insight into the large-scale biogeography of deep-sea harpacticoids, represented by the Paramesochridae, and indicates that distribution ranges, at least in this family, may extend across South Atlantic and Southern Ocean Abyssal Plains.
-
Harpacticoida (Copepoda) fauna and the taxocene diversity of the South China Sea
Oceanology, 2009Co-Authors: E. S. Chertoprud, Samuel Gómez, Hendrik GheerardynAbstract:The full characterized list of known species of Harpacticoida is presented for the South China Sea based on original and literature data. Three Harpacticoida taxocenes from soft sediments are described on the lit- toral and sublittoral of shallows of Nha Trang Bay (Vietnam). The first taxocene is represented by dominating species of the genuses Phyllopodopsyllus and Brianola at the upper and middle littorals. The second one, which is characterized by dominating species of the genus Diarthrodes , is found on sublittoral, silty and fine sands. The third taxocene with dominating species of the genus Amphiascoides is described at coarse sands. The sedi- ment type is a main factor of the organization of sublittoral harpacticoids associations. The depth also has an effect on the harpacticoids diversity and abundance. A comparative analysis of the Harpacticoida species compo- sition is presented for the South China Sea, the Philippines, the Malay Archipelago, New Guinea, the Yellow Sea, and the Andaman and Nicobar Islands. The similarity of the species lists of the considered sector of the Indo-Pacific is extremely low. The main reason for the present high specificity of the faunas of the compared regions is the deficit of studies on Harpacticoida in tropical waters.
-
Diversity and habitat selectivity of harpacticoid copepods from sea grass beds in Pujada Bay, the Philippines
Journal of the Marine Biological Association of the United Kingdom, 2008Co-Authors: Marleen De Troch, Jenny Lynn Melgo-ebarle, Lea Angsinco-jimenez, Hendrik Gheerardyn, Magda VincxAbstract:The spatial diversity of meiofauna from sea grass beds of Pujada Bay (the Philippines), was studied with special emphasis on harpacticoid copepods. Sediment cores were obtained from areas adjacent to the different species of sea grasses. Meiofauna was enumerated at higher taxon level and harpacticoid copepods were identified to genus level. Diversity indices were calculated corresponding to the hierarchical levels of spatial biodiversity, i.e. alpha, beta and gamma. Nematodes were the most abundant meiofaunal group in all sediment layers and along the entire tidal gradient (37–92%); harpacticoids were second in abundance (3.0–40.6%) but highly diverse (N 0 : 9.33–15.5) at the uppermost sediment layer (0–1 cm) near all beds of sea grass species. There was a sharp turnover of harpacticoid genera along the tidal gradient, thus suggesting a relatively low proportion of shared genera among benthic communities in different sea grass zones. The families of Tetragonicipitidae and Miraciidae were the dominant harpacticoid groups occurring in all sediment layers of all sea grass species. The presence of the epiphytic genera of Metis at the deepest sediment layers in some sea grass species was striking. Overall, the major contributor to gamma (total) diversity of harpacticoid copepods in Pujada Bay is the high local (alpha) diversity (N 0 : 80.6%, H′: 94.7% of total diversity); hence, the habitat heterogeneity among sediment layers in sea grass beds is most relevant for the total diversity and richness of harpacticoid copepod genera in the area.
Samuel Gómez - One of the best experts on this subject based on the ideXlab platform.
-
pseudoneotachidius sinuspersici gen et sp nov a new member of the family tachidiidae boeck 1865 copepoda Harpacticoida from iran
Marine Biodiversity, 2020Co-Authors: Omid Mirshamsi, Fatemeh Nazari, Alireza Sari, Mansour Aliabadian, Samuel GómezAbstract:A new member of the harpacticoid copepod family Tachidiidae Boeck, 1865 was found in sediment samples of meiobenthic harpacticoids taken during a study on the diversity of meiobenthic harpacticoids along the northern coast of the Persian Gulf. The taxonomic analysis of this material revealed that it contained an undescribed species. A new genus is herein proposed to accommodate the new species. The new genus, Pseudoneotachidius gen. nov., displays superficial similarities with Neotachidius Shen & Tai, 1963 and Cithadius Bowman, 1972, and a closer relationship is hypothesized with the former. The lack of a midventral copulatory pore, the female P5 endopodal lobe with two inner spines, and P1 with one inner seta on enp-3 are regarded here as synapomorphies for both Neothachidius and Pseudoneotachidius gen. nov. These two genera can be separated by several characters, including the structure and shape of the male fourth antennulary segment, segmentation of the antennary exopod, ornamentation of the male P2 enp-3, sexual dimorphism of the male P2 enp-2, structure and shape of the male P5, morphology of the male P2 and P3, male and female P5 armature complement and ornamentation, male P6, ventral spinulation pattern of the female genital-double somite, and in the mouthparts armature of among others. An updated key to the genera of the family Tachidiidae is presented.
-
updated checklist of published and unpublished records of harpacticoid copepods crustacea copepoda Harpacticoida from mexico
Proceedings of the Biological Society of Washington, 2014Co-Authors: Samuel Gómez, Neptali F MoralessernaAbstract:Abstract An account of previous lists and descriptions of marine and freshwater harpacticoid copepods of Mexico yielded, by year 2010, 71 marine and 21 freshwater species from a variety of habitats. Sediment samples from the littoral zone to more than 2000 m depth along the Mexican Pacific coast, from the west coast of the Baja California peninsula, from the Gulf of Mexico, and from anchialine caves and cenotes from Yucatan, were taken during the last 15 yr as a continued effort to improve our knowledge of the diversity of the harpacticoid fauna from Mexico. This study shows that, at present, 151 species/subspecies distributed in 85 genera and 31 families are known from Mexican marine and freshwater systems. Additionally, a number of species belonging to 78 genera and 25 families are yet to be described. The checklist contains information on the locality, geographic coordinates, habitat, and source of the recorded taxa. There is a better knowledge of the harpacticoids from Sinaloa (northwestern Mexico). H...
-
Harpacticoida (Crustacea: Copepoda) of the South China Sea: faunistic and biogeographical analysis
Hydrobiologia, 2010Co-Authors: E. S. Chertoprud, Hendrik Gheerardyn, Samuel GómezAbstract:Based on original and on published databases, a compendium of the Harpacticoida of the South China Sea is presented, and the distributional range of species is discussed. Up to now, a total of 77 harpacticoid species belonging to 57 genera and 19 families have been recorded in this region. Twenty of these species, collected in Nha-Trang Bay (Vietnam), have not hitherto been described. The most speciose families are the Miraciidae (20 species) and the Laophontidae (9 species). Thirteen families were represented by one to three species only and six families by four to seven species. A brief comparison is presented between the harpacticoid fauna of the South China Sea, the Philippine Islands, the inner Malayan Archipelago (Java, Flores, Banda, and Celebes Seas), New Guinea, the Yellow Sea, and the Andaman and Nicobar Islands. The overall similarity between the species lists of these areas was observed to be extremely low (average value of Simpson index is 0.15 ± 0.08). The lists of planktonic species from the different areas showed the highest similarity. The lowest similarity (highest endemism) was observed between the lists of interstitial species. It is likely that one of the factors determining the differences between the faunas is the poor knowledge about the composition and distribution of benthic harpacticoids in tropical latitudes.
-
Harpacticoida (Copepoda) fauna and the taxocene diversity of the South China Sea
Oceanology, 2009Co-Authors: E. S. Chertoprud, Samuel Gómez, Hendrik GheerardynAbstract:The full characterized list of known species of Harpacticoida is presented for the South China Sea based on original and literature data. Three Harpacticoida taxocenes from soft sediments are described on the lit- toral and sublittoral of shallows of Nha Trang Bay (Vietnam). The first taxocene is represented by dominating species of the genuses Phyllopodopsyllus and Brianola at the upper and middle littorals. The second one, which is characterized by dominating species of the genus Diarthrodes , is found on sublittoral, silty and fine sands. The third taxocene with dominating species of the genus Amphiascoides is described at coarse sands. The sedi- ment type is a main factor of the organization of sublittoral harpacticoids associations. The depth also has an effect on the harpacticoids diversity and abundance. A comparative analysis of the Harpacticoida species compo- sition is presented for the South China Sea, the Philippines, the Malay Archipelago, New Guinea, the Yellow Sea, and the Andaman and Nicobar Islands. The similarity of the species lists of the considered sector of the Indo-Pacific is extremely low. The main reason for the present high specificity of the faunas of the compared regions is the deficit of studies on Harpacticoida in tropical waters.
-
Some additions to the Mexican fauna: The family paramesochridae (Copepoda : Harpacticoida)
Journal of Crustacean Biology, 2002Co-Authors: Samuel GómezAbstract:Abstract Sediment samples were taken during a short-term study of the distribution of meiofauna from a coastal lagoon in Sinaloa (northwestern Mexico). Several species of harpacticoids (Copepoda: Harpacticoida) were observed among the taxa recovered. Some of these species are new to science, whereas some others are new records for Mexican brackish systems. Three species of Apodopsyllus (Harpacticoida: Paramesochridae) are described herein. One of them, A. alejandrovillalobosi sp. nov. proved to be closely related to its northern congener A. vermiculiformis known from California and British Columbia. Apodopsyllus samuelgomezi sp. nov. and A. pseudocubensis sp. nov. constitute new records of the neotropical arcuatus-chilensis-cubensis lineage. Apodopsyllus samuelgomezi sp. nov. is unique within this clade in the male P6 with two long inner setae. Apodopsyllus pseudocubensis sp. nov. was found to be allied to its Cuban relative A. cubensis. These two species share the general shape of female P5 and male P6.
Pedro Martínez Arbizu - One of the best experts on this subject based on the ideXlab platform.
-
new insights from the deep meiofauna in the kuril kamchatka trench and adjacent abyssal plain
Progress in Oceanography, 2019Co-Authors: Christina Schmidt, Valentina V Sattarova, Laura Katrynski, Pedro Martínez ArbizuAbstract:Abstract Community and abundance patterns of meiofauna and Harpacticoida in the Kuril-Kamchatka Trench, that trench’s slope and adjacent abyssal plain which is located in the North-Western Pacific were investigated in relation to environmental variables. Overall, Nematoda was the dominant taxon of the meiofauna community (93%), followed by Copepoda (3%). Nineteen harpacticoid families and 1 subfamily were found, whereby the family Ameiridae was most abundant in the study area. Within eight selected (sub)families (Argestidae, Aegisthidae, Ancorabolidae, Canthocamptidae, Cletodidae, Cylindropsyllinae, Parameiropsidae, Zosimeidae) 27 genera were found, with Zosime and Mesocletodes being most abundant. Dispersion effects characterized the meiofauna community abundances, while the Harpacticoida communities in the hadal and abyssal were distinct. The main contributor to the dissimilarities observed were Nematoda, Ameiridae, Zosime and Mesocletodes. Food availability, sediment composition and water depth are environmental drivers structuring the investigated communities in the abyssal and hadal. For the trench slope, no correlations with the investigated environmental variables were found. Very likely variables other than the investigated ones act as environmental drivers for the trench slope (e.g. topography). Furthermore, a tendency of meiofauna to increase in total abundances was detected with increasing depth in the deeper stations starting at 6000 m. In contrast, total Harpacticoida abundances decrease with depth. Considering the abundance of Harpacticoida families and genera individually, the abundance of some taxa decreased in the trench slope but increased in the trench floor (Zosimeidae, Miraciidae, Argestidae, Parameiropsis, Zosime). Diversity indices based on Harpacticoida genus and family level were not distinguishable with the exception of equitability (J) at the genus level (abyssal vs hadal; trench slope vs hadal).
-
molecular phylogeny and revision of copepod orders crustacea copepoda
Scientific Reports, 2017Co-Authors: Sahar Khodami, Vaun J Mcarthur, Leocadio Blancobercial, Pedro Martínez ArbizuAbstract:For the first time, the phylogenetic relationships between representatives of all 10 copepod orders have been investigated using 28S and 18S rRNA, Histone H3 protein and COI mtDNA. The monophyly of Copepoda (including Platycopioida Fosshagen, 1985) is demonstrated for the first time using molecular data. Maxillopoda is rejected, as it is a polyphyletic group. The monophyly of the major subgroups of Copepoda, including Progymnoplea Lang, 1948 (=Platycopioida); Neocopepoda Huys and Boxshall, 1991; Gymnoplea Giesbrecht, 1892 (=Calanoida Sars, 1903); and Podoplea Giesbrecht, 1892, are supported in this study. Seven copepod orders are monophyletic, including Platycopioida, Calanoida, Misophrioida Gurney, 1933; Monstrilloida Sars, 1901; Siphonostomatoida Burmeister, 1834; Gelyelloida Huys, 1988; and Mormonilloida Boxshall, 1979. Misophrioida (=Propodoplea Lang, 1948) is the most basal Podoplean order. The order Cyclopoida Burmeister, 1835, is paraphyletic and now encompasses Poecilostomatoida Thorell, 1859, as a sister to the family Schminkepinellidae Martinez Arbizu, 2006. Within Harpacticoida Sars, 1903, both sections, Polyarthra Lang, 1948, and Oligoarthra Lang, 1948, are monophyletic, but not sister groups. The order Canuelloida is proposed while maintaining the order Harpacticoida s. str. (Oligoarthra). Cyclopoida, Harpacticoida and Cyclopinidae are redefined, while Canuelloida ordo. nov., Smirnovipinidae fam. nov. and Cyclopicinidae fam. nov are proposed as new taxa.
-
community structure and species diversity of Harpacticoida crustacea copepoda at two sites in the deep sea of the angola basin southeast atlantic
Organisms Diversity & Evolution, 2014Co-Authors: Kai Horst George, Armin Rose, Sybille Seifried, Elke Willen, Karin Bröhldick, Jan Drewes, Pedro Martínez Arbizu, Gritta Veitkohler, Paulo H. C. Corgosinho, Lena MenzelAbstract:The aim of this study was to evaluate compositional differences between harpacticoid (Crustacea, Copepoda) assemblages at two widely separated abyssal locations. During the DIVA 1 cruise of RV METEOR (July/August 2000) to the Angola Basin (Southeast Atlantic), two deep-sea stations, approximately 300 nautical miles apart (Stations 325 and 346), were sampled repeatedly by Multicorer (MUC). For quantitative analyses, 5 MUC samples were selected at random from each of 15 deployments at both stations, totalling 75 cores. Across the study, 7,081 Harpacticoida specimens were encountered and of these 31.4 % were adults and could be analysed to species level: 682 species were identified, with 99.3 % new to science. At northern Station 346, a total of 600 species were recorded—the highest harpacticoid species number ever recorded for a single deep-sea locality. Most species (56 %) were represented by singletons. Multivariate tests identified significant differences between community compositions at the two stations. Diversity, species richness and species density were higher at Station 346, whilst taxonomic distinctness, evenness, and rarefaction were similar between stations. Regression and correlation analyses showed that the difference in species diversity was best explained by species densities rather than species richness. Under-sampling due to low densities was an issue at the southern Station 325. Nevertheless, our study demonstrated significant differences in regional-scale harpacticoid community structures within a single deep-sea basin that would usually be considered a uniform and stable habitat. These observed differences are thought to reflect differences in food availability at the two stations.
-
submarine ridges do not prevent large scale dispersal of abyssal fauna a case study of mesocletodes crustacea copepoda Harpacticoida
EPIC3Deep-Sea Research Part I-Oceanographic Research Papers PERGAMON-ELSEVIER SCIENCE LTD 58(8) pp. 839-864 ISSN: 0967-0637, 2011Co-Authors: Lena Menzel, Kai Horst George, Pedro Martínez ArbizuAbstract:Abstract We examined the large-scale distribution of deep-sea harpacticoid copepods at the species level, in order to clarify the underlying processes of copepod dispersal. The study was based on samples collected from 12 regions and a total of 113 stations: 57 stations at depths between 1107 and 5655 m on abyssal plains in the South and North Atlantic, Southern Ocean, southern Indian Ocean, and the Pacific Ocean, and 56 stations above 900 m in the North Atlantic and eastern Mediterranean Sea. We chose the genus Mesocletodes Sars, 1909 as an ideal group to study the large-scale distribution of harpacticoid copepods in the deep oceans. Clear apomorphies and a comparatively large body size of about 1 mm allow rapid recognition of allied species in meiofauna samples. In addition, Mesocletodes represents more than 50% of the family Argestidae Por, 1986 , one of the most abundant harpacticoid families in the deep sea. The geographical distributions of 793 adult females of Mesocletodes belonging to 61 species throughout the South and North Atlantic, Southern Ocean, southern Indian Ocean, Pacific Ocean, and eastern Mediterranean Sea indicated that most species are cosmopolitan. Neither the topography of the sea bottom nor long distances seem to prevent species from dispersing. Passive transport by bottom currents after resuspension is likely the propulsive factor for the dispersal of Harpacticoida, while plate tectonics and movement of individuals in the sediment may play relatively minor roles.
-
A method for comparing within-core alpha diversity values from repeated multicorer samplings, shown for abyssal Harpacticoida (Crustacea: Copepoda) from the Angola Basin
Organisms Diversity & Evolution, 2005Co-Authors: Armin Rose, Kai Horst George, Sybille Seifried, Elke Willen, Gritta Veit-köhler, Karin Bröhldick, Jan Drewes, Gisela Moura, Pedro Martínez Arbizu, Horst Kurt SchminkeAbstract:Abstract A methodology for comparing repeatedly sampled multicorer stations as to significant differences in alpha diversity of selected cores is presented. This is demonstrated for Harpacticoida of the Angola Basin which were sampled during the DIVA-1 campaign of RV “Meteor” in the year 2000 (M48/1). Two replicatedly sampled multicorer stations were compared as to their species-level alpha diversity values of all adult Harpacticoida in single cores. This was done by a newly developed procedure: based on a rank-ordered alpha diversity matrix, using each a species richness, evenness, and dominance diversity index, a minimum spanning tree test (MST-test) was performed to test for significant diversity differences between the replicates of stations 325 (depth: 5448 m) and 346 (depth: 5389 m). The Canberra Metric was used as a measure of dissimilarity between multicorer deployments. With this procedure, any choice of combination of diversity indices can be made, according to the desired emphasis on certain aspects of diversity. This freedom of choice, together with the possibilities to test for significant diversity differences and to visualize this test, are desirable features of the presented procedure for diversity comparisons. Testing for diversity differences may be useful in the context of conservational purposes when politicians need clear statements from scientists. Due to sufficient replicates, for the first time a significant diversity difference between two abyssal (>2000 m depth) multicorer stations was detectable. Station 346 (eight replicates) was significantly more diverse in harpacticoid species than station 325 (seven replicates). Regional-scale differences in food availability are assumed to be of importance for the different patterns of diversity at stations 325 and 346. The slope of the line of regression in a species/individuals plot on single-core level was not far from 1 ( R 2 = 0.990 ; y = 0.877 x ) , indicating that most species were represented by singletons and the rest only by very few specimens. The data supported scale-dependent differences of harpacticoid diversity in the Angola Basin. Local-scale (between replicates) differences in harpacticoid within-core species diversity were lower than regional-scale (between stations) differences. At least 134 species of Harpacticoida were found at the two stations, of which the subgroups of Pseudotachidiidae, Argestidae, Ameiridae, and Ectinosomatidae turned out to be richest in species and individuals.
E. S. Chertoprud - One of the best experts on this subject based on the ideXlab platform.
-
Composition of Harpacticoida (Crustacea, Copepoda) of the Laptev Sea in comparison with faunas of adjacent Arctic seas
Polar Biology, 2017Co-Authors: E. S. Chertoprud, E. Abramova, Sergei Korsun, F. Martynov, L.a. GarlitskaAbstract:The invertebrate fauna of the Laptev Sea is one of the least investigated in the Arctic. In particular, little is known about the Harpacticoida (Copepoda, Crustacea)—one of the main components of marine meiofauna. Major objectives of our study were (1) to describe harpacticoid composition obtained from three sublittoral stations, (2) to compile the check-list of the Laptev Sea harpacticoids, and (3) to perform a comparative analysis of the Laptev Sea harpacticoid fauna with faunas of other Arctic seas. Of 38 species found in our material, 25 are new for the sea, and four species are likely new to science. A total list for the Laptev Sea includes 76 species from 18 families. Interstitial and phytal forms are poorly represented, due to the rarity of suitable biotopes and/or undersampling. The majority of the provisional endemics were found in the bathyal and abyssal zones of the sea, while widely distributed species, except for the plankton, belong to the fauna of the soft sediments of the littoral zone. Comparative analysis of harpacticoids from the Arctic region (the Laptev, White, Barents, Kara, East Siberian and Beaufort Seas and the Greenland area) shows the considerable distinction between the Eastern (Siberian) and Western sub-regions. Further investigations are necessary to reveal a more detailed pattern in Harpacticoida distribution and to evaluate possible vectors of dispersal and biogeographic relationships in the high Arctic.
-
Harpacticoida copepoda of the caspian sea faunistics ecology and biogeography
Journal of Experimental Marine Biology and Ecology, 2017Co-Authors: E. S. Chertoprud, Agniya M Sokolova, L.a. GarlitskaAbstract:Based on original material collected in the Caspian Sea, the harpacticoid fauna and its taxocene structure were described. The complied list of the Caspian harpacticoids includes 28 species of 16 genera and 10 families. Three species are new to science. Endemics make up 21% of the total species number, while cosmopolitans compose 36%. Four types of taxocenes in the soft littoral sediments of the Caspian Sea were described. High inter-annual variability in the structure of the harpacticoid taxocenes was observed in the Caspian littoral zone in February–March. This may be caused by strong climatic variations in the maritime area, with sporadic alternation of warm and cold winters. A comparative analysis of the faunas of the Caspian, Aral, Azov, Black and Mediterranean Seas was performed. The faunas clearly diverge into two groups: the Mediterranean and the Sarmatian, which indicates the relationships among the faunas of the fragments of the common relict Sarmatian Sea Basin. The harpacticoid fauna also differs considerably within the Sarmatian cluster. The faunas of the Azov, Caspian and Aral Seas are mainly represented by brackish-water species, while marine species dominate in the Black Sea. However, these faunas share numerous brackish species that likely formed earlier the major part of the harpacticoid fauna of the Sarmatian Basin.
-
Harpacticoida copepoda of the northern east sea the sea of japan and the southern sea of okhotsk diversity taxocenes and biogeographical aspects
Journal of Natural History, 2015Co-Authors: E. S. Chertoprud, Svetlana E Frenkel, Kichoon Kim, Wonchoel LeeAbstract:Based on novel data and a literature review, an inventory of Harpacticoida from the northern part of the East Sea and the southern part of Sea of Okhotsk is compiled. A total of 151 species belonging to 70 genera and 26 families, of which 16 species are deemed to be new to science, are recognized from the region. Twelve harpacticoid species assemblages are described from marine and brackish water soft sediments and the phytal zone. Estuarine faunas were similar throughout the East Sea and Sea of Okhotsk, both in species composition and dominant-taxon structure. Conversely, the fauna of marine soft sediment and phytal zones differed greatly throughout this region. This distinction may have been caused by differences in dispersal rates or by differences in environmental conditions. The distribution of littoral and sublittoral harpacticoids was determined primarily by climatic factors and the temperature of surface waters. Three basic sub-regions were distinguished within the survey area: Korean, which inclu...
-
Harpacticoida (Copepoda) fauna and the taxocenes structure of brackish lagoons and estuaries of the Russian far east
Oceanology, 2014Co-Authors: E. S. Chertoprud, S. E. Frenkel, Anna A. Novichkova, S. S. Vodop’yanovAbstract:On the basis of original data and literature sources, the species composition of Harpacticoida (Copepoda) in the plankton of the brackish waters of four Far Eastern regions was described: Khabarovsk krai, Sakhalin Island, Kamchatka Peninsula, and the Commander Islands. The compiled list includes 32 harpacticoid species of 22 genera and 10 families. The representatives of the typical brackish families Canthocamptidae and Ectinosomatidae account for about one-third of the total. Six of the species are new to science: 4 species of Halectinosoma, Amphiascus sp. 1, and Schizopera sp. 1. Cosmopolitan species constitute the major portion of the fauna (38% of the total number), while a smaller proportion is typical of endemics (25%), as well as species with the arctic (12%), tropical (9%), and North American (9%) types of areas. There are 17 types of harpacticoid taxocenes of the observed water bodies. Also, the influence of the salinity and temperature on these species complexes was characterized. The hypotheses about the cosmopolitanism of the brackish water fauna and the intrazonality of the estuarine harpacticoid taxocenes structure were tested. It is shown that the structure of the genera dominance in the taxocenes allocated for the temperature latitudes of the Far East demonstrates significant similarity with the arctic and tropical regions.
-
Harpacticoida (Crustacea: Copepoda) of the South China Sea: faunistic and biogeographical analysis
Hydrobiologia, 2010Co-Authors: E. S. Chertoprud, Hendrik Gheerardyn, Samuel GómezAbstract:Based on original and on published databases, a compendium of the Harpacticoida of the South China Sea is presented, and the distributional range of species is discussed. Up to now, a total of 77 harpacticoid species belonging to 57 genera and 19 families have been recorded in this region. Twenty of these species, collected in Nha-Trang Bay (Vietnam), have not hitherto been described. The most speciose families are the Miraciidae (20 species) and the Laophontidae (9 species). Thirteen families were represented by one to three species only and six families by four to seven species. A brief comparison is presented between the harpacticoid fauna of the South China Sea, the Philippine Islands, the inner Malayan Archipelago (Java, Flores, Banda, and Celebes Seas), New Guinea, the Yellow Sea, and the Andaman and Nicobar Islands. The overall similarity between the species lists of these areas was observed to be extremely low (average value of Simpson index is 0.15 ± 0.08). The lists of planktonic species from the different areas showed the highest similarity. The lowest similarity (highest endemism) was observed between the lists of interstitial species. It is likely that one of the factors determining the differences between the faunas is the poor knowledge about the composition and distribution of benthic harpacticoids in tropical latitudes.
