Effects of 17α-ethinylestradiol on the reproduction of the cladoceran species Ceriodaphnia reticulata and Sida crystallina

2003 ◽  
Vol 28 (7) ◽  
pp. 633-638 ◽  
Author(s):  
W Jaser
Keyword(s):  
Cladoceran Species ◽  
Sida Crystallina ◽  
Ceriodaphnia Reticulata

Interactions between a planktivorous fish and planktonic microcrustaceans mediated by the biomass of aquatic macrophytes

2021 ◽  
Author(s):  
Bárbara Angélio Quirino ◽  
Franco Teixeira de Mello ◽  
Sabrina Deosti ◽  
Claudia Costa Bonecker ◽  
Ana Lúcia Paz Cardozo ◽  
...  
Keyword(s):  
Aquatic Macrophyte ◽  
Plant Biomass ◽  
Flow Speed ◽  
Trophic Niche ◽  
Planktivorous Fish ◽  
Low Flow ◽  
High Biomass ◽  
Predator Prey ◽  
Cladoceran Species ◽  
Macrophyte Biomass

Abstract Habitat complexity is recognized to mediate predator–prey relationships by offering refuge or not. We investigated the availability of planktonic microcrustaceans and the diet of a planktivorous fish (Hyphessobrycon eques) at different levels (low, intermediate and high) of aquatic macrophyte biomass. Sampling was carried out in a river with low flow speed, located in a Neotropical floodplain. We collected fish and microcrustaceans in macrophyte stands with variations in biomass. There were no differences in microcrustacean density in the water among the levels of macrophyte biomass, but microcrustacean richness and diet composition of H. eques differed. Microcrustacean richness and trophic niche breadth of the planktivorous fish were higher in high biomass stands. There was high consumption of a small cladoceran species in low macrophyte biomass, which was replaced by larger species, such as copepods, in intermediate and high biomass. Thus, the selection of some species was different among the biomass levels. These results suggest that plant biomass plays an important role in the interaction between fish and microcrustaceans, and prey characteristics such as size, escape ability and energy value make them more or less subject to predation by fish according to habitat structuring.

Changes in the crustacean communities of Lakes Michigan, Huron, and Erie following the invasion of the predatory cladoceran Bythotrephes longimanus

2004 ◽  
Vol 61 (11) ◽  
pp. 2111-2125 ◽  
Author(s):  
Richard P Barbiero ◽  
Marc L Tuchman
Keyword(s):  
Zooplankton Community ◽  
Crustacean Zooplankton ◽  
Bythotrephes Longimanus ◽  
Zooplankton Community Structure ◽  
Cladoceran Species ◽  
Invertebrate Predators ◽  
Predatory Cladoceran ◽  
Leptodora Kindti ◽  
Escape Responses ◽  
Zooplankton Communities

The crustacean zooplankton communities in Lakes Michigan and Huron and the central and eastern basins of Lake Erie have shown substantial, persistent changes since the invasion of the predatory cladoceran Bythotrephes in the mid-1980s. A number of cladoceran species have declined dramatically since the invasion, including Eubosmina coregoni, Holopedium gibberum, Daphnia retrocurva, Daphnia pulicaria, and Leptodora kindti, and overall species richness has decreased as a result. Copepods have been relatively unaffected, with the notable exception of Meso cyclops edax, which has virtually disappeared from the lakes. These species shifts have for the most part been consistent and equally pronounced across all three lakes. Responses of crustacean species to the Bythotrephes invasion do not appear to be solely a consequence of size, and it is likely that other factors, e.g., morphology, vertical distribution, or escape responses, are important determinants of vulnerability to predation. Our results indicate that invertebrate predators in general, and invasive ones in particular, can have pronounced, lasting effects on zooplankton community structure.

scholarly journals Variations de la structure trophique du lac-réservoir oligotrophe Bin El Ouidane (Maroc)

2005 ◽  
Vol 15 (1) ◽  
pp. 193-208 ◽  
Author(s):  
O. Cherifi ◽  
M. Loudiki
Keyword(s):  
Ceriodaphnia Dubia ◽  
Régime Alimentaire ◽  
Tube Digestif ◽  
Tinca Tinca ◽  
Daphnia Longispina ◽  
Tractus Digestif ◽  
Diaphanosoma Brachyurum ◽  
Bin El Ouidane ◽  
Ceriodaphnia Reticulata ◽  
Spectre Alimentaire

L'étude combinée des apports par les crues, du plancton, des contenus algaux du tractus digestif des Cladocères et du régime alimentaire de quelques espèces de poissons dans le lac de barrage oligotrophe Bin El Ouidane a permis de dégager les conclusions suivantes : - les apports particulaires et dissous par les crues durant la période d'étude 1995-1997 ont une influence marquée sur la dynamique saisonnière du zooplancton via les changements dans la dynamique du peuplement phytoplanctonique ; - durant les trois années d'étude, le maximum de biomasse zooplanctonique se situe généralement juste après les pics printanier et estival du phytoplancton mettant ainsi en évidence l'importance du zooplancton herbivore dans la chaîne alimentaire pélagique du lac ; - l'étude des contenus algaux du tractus digestif des Cladocères Daphnia longispina, Daphnia lumholtzi, Diaphanosoma brachyurum, Ceriodaphnia dubia, Ceriodaphnia reticulata et Bosmina longirostris a montré que l'essentiel des espèces sont des filtreuses herbivores qui adoptent un comportement nutritionnel variable en fonction du temps lié à la disponibilité en phytoplancton, à leur âge et aux caractéristiques biotiques et abiotiques de l'écosystème lacustre ; - l'étude préliminaire du régime alimentaire de trois espèces de poissons Tinca tinca, Eupomotis gibbosus et Cyprinus carpio montre que leur spectre alimentaire est nettement dominé par le plancton. La fraction faunistique au niveau de leur tube digestif est représentée essentiellement par les Cladocères de grande taille et les Chironomes. Ceci met en évidence l'importance de ces poissons, à régime essentiellement planctonophage, dans la régulation des peuplements planctoniques de la retenue Bin El Ouidane.

Zooplankton dynamics during autumn circulation in a small, wind-sheltered, Mediterranean lake

2006 ◽  
Vol 57 (4) ◽  
pp. 441 ◽  
Author(s):  
M. Alvarez-Cobelas ◽  
A. Baltanás ◽  
J. L. Velasco ◽  
C. Rojo
Keyword(s):  
Water Temperature ◽  
Current Model ◽  
Fish Predation ◽  
Controlling Factors ◽  
Heterotrophic Nanoflagellates ◽  
Delayed Effects ◽  
Zooplankton Dynamics ◽  
Mediterranean Lake ◽  
Fish Abundances ◽  
Ceriodaphnia Reticulata

Few studies have been undertaken on zooplankton dynamics during the transition from late stratification to early mixing in lakes. The Plankton Ecology Group (PEG) model of plankton seasonality only considers water temperature, edible phytoplankton and fish predation as zooplankton-controlling factors during that period. The water-column edible algal and bacterial fractions, heterotrophic nanoflagellates, ciliates, rotifers, cladocerans and copepods were studied during 93 consecutive days of mixing-transition in a wind-sheltered, Mediterranean lake without planktivorous fish. Abundances of all zooplankton populations except ciliates, Daphnia longispina and copepodites, were related to water temperature. In addition to PEG controlling factors, time series analysis indicated competition between ciliates and Ceriodaphnia reticulata and Polyarthra dolichoptera and D. longispina, predation of Arctodiaptomus salinus on ciliates, herbivory of adult copepods on the 5–20 μm phytoplanktonic size and delayed effects shorter than one week. The remaining zooplankton populations did not show any edible size preference. Ceriodaphnia reticulata showed evidence of herbivory on bacteria and picoplankton and competition with Hexarthra fennica in shorter periods. Phyto- and zooplankton production were decoupled. These results, and others from warmer periods and latitudes, suggest that the current model of lake plankton seasonality must be reviewed.

scholarly journals The inverted trophic cascade in tropical plankton communities: impacts of exotic fish in the Middle Rio Doce lake district, Minas Gerais, Brazil

2008 ◽  
Vol 68 (4 suppl) ◽  
pp. 1025-1037 ◽  
Author(s):  
RM. Pinto-Coelho ◽  
JF. Bezerra-Neto ◽  
F. Miranda ◽  
TG. Mota ◽  
R. Resck ◽  
...  
Keyword(s):  
Fish Fauna ◽  
Zooplankton Community ◽  
Minas Gerais ◽  
Ecological Impacts ◽  
Trophic Levels ◽  
Lake District ◽  
Exotic Fish ◽  
Ecological Release ◽  
Piscivorous Fish ◽  
Cladoceran Species

The present study deals with the ecological impacts of the introduction of two alien species of piscivorous fish in several lakes of the Middle Rio Doce lake district in Minas Gerais, Brazil. It was demonstrated that these effects were not restricted only to the fish community. The introduction of the predatory red piranha Pygocentrus nattereri and the tucunaré Cichla cf. ocellaris caused not only a sharp decrease in the number of native fish species, but also major shifts in other trophic levels. Just after the fish were introduced, most lakes began to show conspicuous changes in phytoplankton species composition, in which Cyanophyceae gradually came to dominate. The zooplankton community lost several species, and in some cases, such as Lake Carioca, all the cladoceran species disappeared. On the other hand, invertebrate predators, represented by the dipteran Chaoboridae, boomed in the lake, with higher densities of exotic species, probably as a result of the "ecological release" by reduction of the original fish fauna. There was a general trend of species loss in different trophic levels. All these changes are apparently associated with decreases in water quality. The present situation in these lakes demands new approaches to the management and conservation of these ecosystems.

Resistance of Cladoceran species to toxic Microcystis

Limnetica ◽  
2001 ◽  
Vol 20 (1) ◽  
pp. 173-177
Author(s):  
P. Barros
Keyword(s):  
Cladoceran Species

scholarly journals Copepods act as omnivores in a (sub)tropical reservoir: Implication for the top-down effect on phytoplankton

2018 ◽  
Vol 77 (2) ◽  
Author(s):  
Qiuqi Lin ◽  
Liang Peng ◽  
Yang Yang ◽  
Bo-Ping Han
Keyword(s):  
Organic Matter ◽  
Trophic Position ◽  
Zooplankton Community ◽  
Nitrogen Isotope ◽  
Terrestrial Organic Matter ◽  
Tropical Reservoir ◽  
Cascading Effect ◽  
Cladoceran Species ◽  
Grazing Effect ◽  
One Year

Tropical reservoirs in China receive a high input of organic matter from surrounding watersheds and this represents a significant resource for zooplankton consumers. Copepods are often the dominant zooplankton group in the tropical systems. Whether copepods tend to be omnivorous and their potential cascading effect on phytoplankton are subjects of debate. We used stable carbon and nitrogen isotope analyses to elucidate the allochthony and trophic positions of two copepod species (Phyllodiaptomus tunguidus and Mesocyclops thermocyclopoides) and one cladoceran species (Diaphanosoma orghidani) over a one-year period in a tropical oligo-mesotrophic reservoir in China. We assumed the filter-feeding D. orghidani was herbivorous and we used it as a baseline indicator of δ15N to estimate the trophic position of the two copepods. P. tunguidus and M. thermocyclopoides had an average trophic level that was 0.7 and 0.5 higher, respectively, than that of D. orghidani. M. thermocyclopoides showed seasonal differences in trophic position and an increase in trophic position with rising temperatures, whereas P. tunguidus remained omnivorous throughout the year. All three zooplankton species had a much higher degree of allochthony in the flood season than in the dry season, and their allochthony was positively related to the allochthony of the particulate organic matter input. The two copepods’ omnivorous behavior suggests their allochthony was primarily linked to microbial food web based on the input of terrestrial organic matter. The chlorophyll a to total phosphorus ratio was much higher when P. tunguidus dominated the zooplankton community than when D. orghidani dominated. The ratio was positively related to the ratio of omnivorous adult copepods to cladoceran biomass but not to the zooplankton:phytoplankton biomass ratio. Our results suggest that copepods tended to be omnivorous and relied heavily on allochthonous material in the study reservoir. The indirect cascading effect is likely to be stronger than the direct grazing effect, resulting in a positive effect of copepods on the phytoplankton.

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