scholarly journals ROTÍFEROS Y OTRAS ESPECIES ZOOPLANCTÓNICAS LITORALES DE LA LAGUNA DE PACA Y ÑAHUINPUQUIO, JUNÍN, PERÚ

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
José Iannacone ◽  
Neil Salazar ◽  
Lorena Alvariño ◽  
George Argota
Keyword(s):  
Keratella Cochlearis

Este trabajo tuvo como objetivo evaluar los rotíferos y otras especies zooplanctónicas litorales de las lagunas altoandinas (~3400 msnm) de Paca (75°30´LW; 11°40¨LS) y Ñahuinpuquio (75°32´LW; 11°46´LS), Junín, Perú. En agosto de 1994 fueron evaluados cuantitativamente los rotíferos y otras especies zooplanctónicas litorales en las lagunas de Paca y Ñahuinpuquio empleando una red de plancton de 45 um. Los valores son expresados en N° org·L-1. En las 16 estaciones de la laguna de Paca fueron registradas un total de 22 especies, un promedio de seis especies (0-12), 30 org·L-1 (0-164) y un valor del índice de Shannon-Wiener de 2,11 bits·ind-1. Los rotíferos registrados fueron: Keratella cochlearis (Gosse, 1851) (37,5% de las estaciones) y Rotaria sp. (12,5% de las estaciones). En las 17 estaciones de la laguna de Ñahuinpuquio fueron registradas un total de 34 especies, un promedio de 12 especies (0-27), 22 org·L-1 (0-53) y un valor del índice de Shannon-Wiener de 2,95 bits·ind-1. Los rotíferos encontrados fueron: K. cochlearis (58,88% de las estaciones), Rotaria sp. (5,88% de las estaciones), Platyias quadricornis (Ehrenberg, 1832) (5,88% de las estaciones) y Trichocerca bicristata (Gosse, 1887) (5,88% de las estaciones). La diversidad beta empleando el índice de similitud cualitativo de Jaccard (I ) y el J cuantitativo de Bray-Curtis (I ) señalaron para el zooplancton de las lagunas de Paca y B-C Ñahuinpuquio valores de 50% y 59,7%, respectivamente. Los estimadores del número de especies zooplanctónicas para la laguna de Paca y Ñahuinpuquio fueron según Chao-1 (22,5; 52), Jacknife-1 (22; 50) y Bootstrap (22; 45), respectivamente.

ZOOPLANKTON OF SMALL LAKES IN THE EASTERN PART OF THE CATCHMENT AREA OF LAKE VOZHE (VOLOGDA OBLAST)

2021 ◽  
pp. 84-103
Author(s):  
E. Lobunicheva ◽  
A. Litvin ◽  
N. Dumnich ◽  
M. Borisov
Keyword(s):  
Catchment Area ◽  
Daphnia Pulex ◽  
Plain Water ◽  
Small Lakes ◽  
Keratella Cochlearis ◽  
Vologda Oblast ◽  
Dominant Complex ◽  
Average Abundance ◽  
Asplanchna Priodonta ◽  
Landscape Types

In the summer period of 2017–2020, the authors studied the composition, dominant complex and the abun-dance of zooplankton in 23 small lakes in the eastern part of the Lake Vozhe catchment area (Vologda oblast). The lakes are located in lacustrine-glacial, moraine-hilly and moraine-plain landscapes. A total of 121 species are recorded in zooplankton of the lakes (Rotifera – 38, Cladocera – 56, Copepoda – 27) including Holopedium gibberum, Daphnia pulex, Bunops serricaudata, Paralona pigra, Chydorus ovalis, Acanthodiaptomus denticornus denticorn that are relatively rare species for the region. The highest occurrence is typical for eurybiontic species. The planktonic fauna of the waterbodies of lacustrine-glacial terrains is sui generis (the index of similarity with other lakes is 0.4). The level of similarity in the composition of zooplankton in moraine lakes is 0.7 on average. Zooplankton in the lakes of different landscape types differs in the structure of dominant complex. The set of dominants in the reservoirs of the lacustrine-glacial terrains is sui generis (Keratella cochlearis, Daphnia galeata, Eudiaptomus graciloides, Heterocope appendiculata). The composition of zooplankton dominants in moraine lakes is more diverse. Most of these waterbodies are dominated by Kellicottia longispina, Keratella cochlearis, Bosmina longirostris, Thermocyclops oithonoides. In the lakes of the moraine-hilly landscape, the set of dominants also includes Eudiaptomus gracilis and E. graciloides, and in the moraine-plain water bodies Asplanchna priodonta, Diaphanosoma brachyurum, Ceriodaphnia pulchella, Polyphemus pediculus are dominant. The highest average abundance (137.7 thousand ind./m3) and biomass (1.8 g/m3) are typical for the lakes in moraine-plain landscapes. The morphology of the depressions of these lakes contributes to the development of macrophyte thickets. The abundance and biomass of zooplankters in waterbodies of the lacustrine-glacial landscapes are 58.9 thousand ind./m3 and 0.8 g/m3, respectively. The development of macrophytes in these reservoirs is limited by a rapid increase in depth and the predominance of peat and peat-silt soils.

Zooplankton in a Danube River Arm near Rusovce (Slovakia)

Biologia ◽  
2008 ◽  
Vol 63 (4) ◽  
Author(s):  
Marta Illyová ◽  
Katarína Bukvayová ◽  
Danka Némethová
Keyword(s):  
Water Temperature ◽  
Zooplankton Biomass ◽  
Danube River ◽  
Total Abundance ◽  
Small Species ◽  
Annual Average ◽  
Keratella Cochlearis ◽  
Chydorus Sphaericus ◽  
Cyclops Vicinus ◽  
The Right

AbstractPoor quantity of zooplankton was recorded in a Danube arm situated on the right side of the Danube River in Slovakia (river km 1857) in 2002 and 2003. All over the year the arm is significantly influenced by groundwater by reason of seepage. Because of low mean water temperature (12°C) and poorly developed macrovegetation in particular, the arm reminds gravel pit-like. The annual average of zooplankton biomass was low and ranged from 0.35 g m−3 (2002) to 1.28 g m−3 (2003), because of low crustacean abundance. Total cladoceran abundance was excessively low in both years and ranged from 3.5 N L−1 (2002) to 16.6 N L−1 (2003). Small species, Bosmina longirostris and Chydorus sphaericus were dominant. Only four adult Copepoda — Cyclops vicinus, Thermocyclops crassus, Eurytemora velox and Eudiaptomus gracilis — were recorded in quantitative samples of both years. In the zooplankton assemblage dominated rotifers (Synchaeta pectinata, Synchaeta oblonga, Polyarthra dolichoptera and Keratella cochlearis) which represented 78% and 67% of total abundance respectively. The total of 19 species of rotifers, 34 Cladocera species and 16 taxa of Copepoda were found.

First study on the male inducing signal in Keratella cochlearis: Crowding is the key

Limnologica ◽  
2019 ◽  
Vol 77 ◽  
pp. 125688 ◽  
Author(s):  
A. Cieplinski ◽  
T. Weisse ◽  
U. Obertegger
Keyword(s):  
Keratella Cochlearis
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