Se registran por primera vez para las aguas cubanas dos familias, tres géneros y tres especies de copépodos harpacticoides bentónicos. Además, se brinda la profundidad y el tipo de sustrato en que ...fueron encontrados.
Our research provides valuable insights into the uneven distribution of groundwater copepods in the lowland river valley ecosystem using an integrative taxonomy approach. The study was conducted in ...101 wells in the Biebrza River Valley (northeastern Poland), which is one of the largest and best-preserved lowland rivers in Europe. It stands out for its exceptional biodiversity and pristine natural landscapes. Groundwater copepods were found in 49 of the 101 analyzed wells. We identified ten species of Copepoda and eight species of Cladocera. The most frequent copepods were Diacyclops bicuspidatus, Diacyclops crassicaudis, Canthocamptus staphylinus, Paracyclops cf. fimbriatus, Diacyclops bisetosus, and Eucyclops serrulatus. The aforementioned species were categorized as stygophiles, and no stygobionts were detected. Our findings suggest that the groundwater Copepoda community in this region is relatively stable and composed mostly of stygophiles along with stygoxenes. We did not find any significant impact of environmental parameters or different aquifers on the distribution of copepods, suggesting a patchy distribution of groundwater copepods in the lowland river valley. The relatively high presence of stygoxenes suggests that the exchange of organisms between surface water and groundwater plays a vital role in maintaining the diversity of microcrustaceans in lowland river valleys. Our study contributes to filling the knowledge gap regarding groundwater fauna in lowland Europe, particularly in areas affected by Pleistocene glaciations.
The present study gives new data on a poorly studied group of brackish harpacticoids from the North-West coast of the Black Sea, Ukraine. Seven harpacticoids species (Crustacea, Copepoda) collected ...in July 1988 from the Budakskyi (Shabolatskyi) Lagoon are reported.
•First study of Harpacticoida/Canuelloida of the Mediterranean Anaximenes Seamount.•271 harpacticoid/canuelloid species were reported, 89.3% scientifically unknown.•Anaximenes Seamount presents a ...highly diverse harpacticoid/canuelloid fauna.•A revision of the Mediterranean deep-sea Harpacticoida/Canuelloida is provided.
During research cruise M71/1 of German FV METEOR in winter 2006, meiofauna sampling was undertaken on the eastern Mediterranean Anaximenes Seamount at six sites (the summit, northern slope, north-western slope, north-western base, north-eastern slope and eastern base). Analysis of the benthic Copepoda (i.e. Harpacticoida and Canuelloida) revealed a highly diverse fauna. This is in contrast to what is generally considered an impoverished bathyal and abyssal fauna in the surrounding eastern Mediterranean Sea: It is regarded as one of the most oligotrophic regions of the world’s oceans. This is attested to by comparison of the seamount fauna with that of a remote deep-sea (“Far-field”) site in the Rhodes Basin, which presented a clearly impoverished fauna with respect to abundance, higher-taxon diversity and species diversity. Comparison of sites across the seamount found no overall “seamount community” of benthic Copepoda. Instead, three different assemblages could be detected, with abundance and species diversity comparable to north-eastern Atlantic seamounts and islands. Regarding species composition, however, only four of the recorded species are shared with other Mediterranean and Atlantic elevations. The benthic copepod fauna at Anaximenes Seamount is composed mostly by “typical” deep-sea and eurybathic species, whilst “typical” shallow-water species were absent. Thus, it is concluded that Anaximenes Seamount does not play a role in the dispersal of shallow-water benthic Copepoda. Nonetheless, it appears important for the establishment of abundant and diverse deep-sea communities. Moreover, it constitutes no barrier for the dispersal of deep-sea benthic Copepoda in the Mediterranean.
•Meiofauna total abundance increase with increasing depth starting at 6000 m.•For Harpacticoida the relationship between depth and abundance is complex.•Ameiridae was the most abundant harpacticoid ...family.•The harpacticoid genus Zosime was clearly dominant in the hadal.•Sediment composition and food availability cause differences in abundance patterns.
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).
Changes in epibenthic copepod populations markedly affect the population of benthic dwelling animals in rivers, estuaries and marine ecosystems. Unfortunately, studies focusing the environmental ...influence on the structure of epibenthic copepods are lacking. This study addresses the deficit of information focusing the environmental factors that affect the structure of epibenthic copepods in various lotic environments. The copepods community and environmental variables in water 0.3 m above the bottom of four areas (from 10 km upstream of the Kuantan River mouth to 5 km offshore) were studied monthly over one-year. The study area is characterised by a hot equatorial climate with the monsoon (more-rainy summer, October–March) and the non-monsoon (less-rainy summer, April–September). Totally forty-three species of copepods on thirteen groups were recorded, with harpacticoid copepod groups being dominant in all sampling zones except the upstream zone, where freshwater copepods were dominant and harpacticoid copepods were absent. The total abundance of copepods was greater at the coast and estuary than at the river. Phytoplankton density, salinity, total suspended solids (TSS) and dissolved oxygen (DO) significantly influenced the abundance of epibenthic copepod groups, but their influence on copepods was zone-specific. At the coastal and the estuarine zones, harpacticoid copepod groups were positively influenced by the abundance of phytoplankton, whereas the other copepod groups were negatively influenced by the TSS. The influence of TSS on cyclopoid and calanoid copepods was dependent on the density of phytoplankton with a higher density reducing the impact of TSS. At the downstream, harpacticoid copepod groups were positively influenced by the abundance of phytoplankton, DO and salinity while the other copepod groups were positively influenced by DO and salinity and negatively influenced by TSS. At the upstream, freshwater copepod groups were positively influenced by the DO concentration and negatively influenced by the salinity while, other copepod groups were positively influenced by both DO and salinity. Other environmental variables had a weak and insignificant influence on the densities of observed copepod groups. Both monsoon and non-monsoon seasons equally influenced the observed copepod groups. The observed results need to be regularly monitored to changing tropical environments for better elucidating the ecology of various groups of epibenthic copepods associated with the climate change and various anthropogenic activities.
•Epibenthic copepods dynamics in river, estuary and coastal waterbodies.•Influence of environmental factors on epibenthic copepods dynamics.•Seasonal influence on the epibenthic copepod groups.•Influence of monsoon and non-monsoon seasons on the environmental parameters.•Environmental parameters and structure of copepods in the oligohaline waterbody.
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.
Two new species of
Chappuis, 1929 from the Russian Arctic from the
species group are described:
and
A complete morphological comparison of the new species with the type species
(Claus, 1863) was ...carried out. Significant interspecific differences were shown at the level of microcharacters, such as integumental sensillae and pores, ornamentation of segments of mouthparts and swimming legs, and pores on swimming legs. A significant correlation has also been shown in the shape of the caudal rami of the females and the antennules of the males, which is likely caused by an evolutionary sexual arms race.
and
have a similar structure of caudal rami, but completely different male antennules, which may indicate a convergent origin of modifications and highlights the importance of depicting male antennules in the species descriptions.
•Microsatellite markers for five surface and groundwater species.•Populations of surface and groundwater species are highly variable and structured.•Neighboring populations share low levels of gene ...flow.•Genetic methods reveal hidden natural or man-made groundwater hydrological patterns.•The StygotracingⓇapproach represents a promising tool for drinking water management.
Groundwater is one of our most important resources, however groundwater ecosystems are among the most understudied habitats of the planet earth. Studies on groundwater organisms are hampered by the difficult accessibility of species, the lack of morphological differentiation and the limitation for laboratory cultures. One important approach to overcome these shortcomings is to provide sensitive genetic methods to unravel patterns of biodiversity, population structure and gene flow in natural populations. In this study we present five sets of microsatellite markers developed for the isopods Asellus aquaticus and Proasellus slavus, the cyclopoides Paracyclops fimbriatus and Acanthocyclops sensitivus and the harpacticoide Bryocamptus echinatus (Crustacea). Two of these species were subjected to detailed population genetic analyses: We studied 501 specimens of Asellus aquaticus from four different regions in Northern Germany using nine microsatellite markers and 70 specimens of Bryocamptus echinatus using nine microsatellite markers from three different sampling sites in South-Western Germany. Our results show that genetic diversity is high (A. aquaticus: 10 to 20 and B. echinatus: 4 to 18 alleles per locus) among populations of aquatic invertebrates, populations are highly differentiated (FST > 0.2) and genetic differentiation was associated with geographic patterns. Applications of molecular genetic methods and their use for the detection of hydrological exchange processes relevant for drinking water suppliers are demonstrated and discussed.
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