Temporal and Spatial Dynamics of Planktonic Rotifers in the Elbe Estuary during Spring

Holst, Henry; Zimmermann, Heike; Kausch, Hartmut; Koste, Walter

doi:10.1006/ecss.1998.0364

Cited by 49 publications

(36 citation statements)

References 63 publications

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“…Environmental matching (BEST), as per the PRIMER analysis ( Table 2), showed that temperature, conductivity, salinity and phosphate were the best combination of variables that determined the abundance and distribution of rotifers in Vembanad estuary with a rho value of 0.86 (Table 2). Salinity gradient and conductivity are known to be important factors limiting the growth of planktonic rotifer populations in the Vembanad estuary, which was in agreement with the studies of Holst et al (1998). Shiel (1979), while studying rotifers of the South Australia, also observed that no single factor can be defined as limiting, but increasing salinity had the most marked impact on the rotifer population, when a decrease in species diversity was recorded.…”

Section: Rotiferssupporting

confidence: 87%

Species Diversity and Community Assemblage of Planktonic Rotifers from Vembanad Estuary-Kerala, India

Cleetus¹,

Asha²,

Suson³

et al. 2014

International J. of Oceanography and Marine Ecological System

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Among the zooplankton, Rotifera comprise an integral part of the food chain and are important link between nanoplankton and carnivorous zooplankton. The diversity of rotifers is indicative of the ecological factors of the water body as they respond more quickly to environmental changes and appear as sensitive indicators of changes of water quality. In this context, species diversity of planktonic rotifers and its community assemblage in Vembanad backwater (Ramsar site) has been carried out from March 2012 to February 2013 from ten selected stations on North and South of the Thanneermukkom barrage. Abiotic and biotic parameters were determined and correlated with rotifer abundance to gain information about the forces that assembles the rotifer community in this dynamic environment. Maximum abundance was observed during monsoon (av. 8934 individual . During the present study 26 species of the rotifers belonging to 10 families were observed, with maximum abundance of Brachionus sp. (60%). Predominant species were Brachionus rotundiformis (16.4%), B. calyciflorus (6.6%), B. urceolaris (5.5%), B. plicatilis (4.05%), Keratella tropica (3.2%) and Asplanchna sp. (2.2%). Most of the dominant species observed were eurytopic freshwater forms that became less abundant towards downstream (station 8, 9 and 10) with respect to the salinity gradient prevailing in the estuary. Highest Shannon diversity index (4.51) was observed in station 3 (Rani) and lowest (2.73) in station 10 (Aroor). Multivariate Bio-Env (BEST) analysis showed that temperature, conductivity, salinity and phosphate best determined the abundance and distribution of rotifers in the Vembanad estuary. As the trophic status and rotifer assemblages of an ecosystem are very much related, a comprehensive study on the species diversity and community assemblage of rotifers in Vembanad estuary can furnish a valuable integrative index for further ecological assessment and monitoring of estuarine ecosystems.

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Section: Rotiferssupporting

confidence: 87%

Species Diversity and Community Assemblage of Planktonic Rotifers from Vembanad Estuary-Kerala, India

Cleetus¹,

Asha²,

Suson³

et al. 2014

International J. of Oceanography and Marine Ecological System

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“…Differently from the above-cited literature, freshwater species are not displaced by saline ones at the river mouth of the Alcantara River, during the study period, probably because conductivity remains in a freshwater range, representing a salinity barrier to marine species. This is also confirmed by the absence of brackish water genera, such as Synchaeta (Hartmut et al, 1990;Gallegos, 1991, 1992;Lopes, 1994;Gaughan and Potter, 1995;Holst et al, 1998). The abundance pattern found in Alcantara River is consistent with groups separated by cluster analysis, in which it may be distinguished an upstream community, characterized by low densities; an intermediate and a downstream communities with increasing abundance patterns, that reached the maximum at the river mouth.…”

Section: Discussionsupporting

confidence: 54%

Spring rotifer community structure in the Alcantara River (Sicily, Italy), using different mesh size nets: relation to environmental factors

Rodríguez

Granata

Guglielmo

et al. 2013

Ann. Limnol. - Int. J. Lim.

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-The present study focus on some aspects of zooplankton structure in the Alcantara River (Sicily, Italy), in relation to environmental factors. Zooplankton samplings were performed in spring in four sites, located from up-to downstream along the river course. Four low-flow velocity station points were chosen along a transversal river section in each site. Samples were taken from all station points in the four sites by two different mesh sizes (55 and 100 mm) rectangular nets. Rotifer abundances were an order of magnitude higher in 55 mm mesh size samples than in 100 mm mesh size ones. The two communities also resulted significantly different (ANOSIM test, r = 0.212; P = 0.1%). Generally, low abundances (from 3470 ¡ 5133 to 422 ¡ 474 ind.m x3 ) were explained by low chlorophyll a concentration and the highflow regime of this river. Rotifer dominated the zooplankton community. Cladocerans, copepods and nauplii occurred with considerably lower abundances than rotifers. However, the relative contributions of these taxa to total abundances depended on the mesh sizes used. Euchlanis and Adineta genera exhibited the highest abundances in the rotifer assemblage. Conductivity alone or in association with temperature and dissolved oxygen was the most important environmental factor affecting rotifer community distribution. Cephalodella sp., Lepadella sp. and Trichotria pocillum showed a high positive relation to pico-plankton, showing this fraction as a possible rotifer food item. This paper demonstrated a higher efficiency of the finest net to characterize riverine zooplankton community that increases from up to downstream in terms of abundances and diversity.

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“…Synchaeta sp. has also been found abundant in spring to early summer (Elliott 1977;Holst et al 1998), while Ploesoma truncatum showed higher abundance in summer according to Berzins & Pejler (1989) and Ferrara et al (2002). Finally, Gastropus stylifer was present from spring to autumn in the study area, as in Lake Trichonis (Doulka & Kehayias 2008).…”

Section: Seasonal Variability Of Zooplanktonmentioning

confidence: 69%

Zooplankton dynamics in the upstream part of Stratos reservoir (Greece)

Kehayias

Chalkia

et al. 2008

Biologia

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The investigation of the zooplankton community in the upstream part of Stratos reservoir during a 24 months survey (September 2004 -August 2006 revealed 26 invertebrate species (14 rotifers, 6 cladocerans, 5 copepods and one mollusk larva). The mean abundance of the total zooplankton was higher in the first sampling period (2004)(2005) and ranged between 8.81 and 47.74 ind. L −1 , than the second period (2005)(2006) when fluctuated between 1.91 and 43.09 ind. L −1 . The seasonal variation was strongly influenced by the presence of rotifers, which accounting on average for 68.4% in total. Among them Keratella cochlearis and the order Bdelloidea were numerically the most important, while Macrocyclops albidus prevailed among the copepods and Bosmina longirostris among the cladocerans. Dreissena polymorpha was the only mollusk found in the zooplankton community. Rotifers, copepods and cladocerans showed a seasonal succession with the former preceding in the abundance having their first maximum in spring, while copepods and cladocerans followed, having peaks of abundance in early summer and in autumn, respectively. No seasonal succession among the cladoceran species was observed. The intense water flow in the upstream part of the reservoir, as well as temperature, conductivity, DO, pH, phosphates and silicates, were significant parameters controlling abiotic and biotic elements of the ecosystem and consequently influencing the seasonal variation and the dynamics of the zooplankton community.

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Temporal and Spatial Dynamics of Planktonic Rotifers in the Elbe Estuary during Spring

Cited by 49 publications

References 63 publications

Species Diversity and Community Assemblage of Planktonic Rotifers from Vembanad Estuary-Kerala, India

Species Diversity and Community Assemblage of Planktonic Rotifers from Vembanad Estuary-Kerala, India

Spring rotifer community structure in the Alcantara River (Sicily, Italy), using different mesh size nets: relation to environmental factors

Zooplankton dynamics in the upstream part of Stratos reservoir (Greece)

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