Freshwater copepods and rotifers: predators and their prey

Brandl, Z.

doi:10.1007/1-4020-4408-9_49

Cited by 48 publications

(28 citation statements)

References 101 publications

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“…Most rotifer species showed a negative correlation with cyclopoids (especially adults and copepodite stages) and total rotifer abundances notably increased in the mesocosms with low cyclopoids, thus indicating a top down effect. The reported predation rates of A. robustus on rotifers are high enough to produce a top-down control (Hopp et al, 1997;Roche, 1990;Brandl, 2005). Food chain theory applied to the mesocosms with high fish, explain our results, i.e.…”

Section: Bottom-up and Top-down And Effects On System Variablessupporting

confidence: 50%

Fish and nutrient enrichment effects on rotifers in a Mediterranean shallow lake: a mesocosm experiment

2007

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A mesocosm experiment was conducted ''in situ'' in a Chara dominated shallow lake near Valencia (Spain) to study top-down and bottom-up effects on rotifers by means of nutrient and fish additions. Both processes were important in determining rotifer abundance, biomass and diversity. A total of 36 mesocoms were established with triplicate treatment combinations of three fish levels (from no fish to 45 individuals of Gambusia holbrooki males) and four nutrient enrichment levels (from no additions to 10 mg l À1 nitrate-N and 1 mg l À1 phosphate-P). The main effect was a notable increase of planktonic and plant associated rotifers densities with fish. Rotifers benefited from mosquitofish predation on microcrustaceans and chironomids. The results showed a marked negative relationship between rotifer and cyclopoid abundances, indicating the importance of the predatory pressure of cyclopoids on rotifers. Effects on rotifer diversity were also evident, in general rotifer diversity decreased with nutrients and increased with fish. The effects of nutrients analysed at species level showed two contrasting density responses: an increase or a decrease with nutrients, which levelled off at high nutrient concentrations. High-level nutrient additions (from 5 mg l À1 nitrate-N and 0.5 mg l À1 phosphate-P) induced a switch to a turbid state with macrophyte disappearance. Most planktonic rotifer species, as well as plant associated ones, diminished when the turbid state was well established, especially in the mesocosms without fish. In the turbid mesocosms, relative abundance of plant-associated rotifers (as a whole) was higher than that of planktonic rotifers. The changes in rotifer species composition after the switch from a clear to a turbid water state are also described. Species of the genus Anuraeopsis, Trichocerca and Hexarthra, dominant in the clear water state, practically disappeared in the turbid water state, in which Proalides tentaculatus and Lecane nana were the main species.

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Section: Bottom-up and Top-down And Effects On System Variablessupporting

confidence: 50%

Fish and nutrient enrichment effects on rotifers in a Mediterranean shallow lake: a mesocosm experiment

2007

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“…High numbers of copepod nauplii and Synchaeta coincided with higher death rates of Rhinoglena pointing to possible competitive advantage during the latter's mortality. A significant correlation between death rates and the occurrence of copepodids and adults of cyclopoids, which are known as potential predators (Brandl 2005) strengthens the idea of predatory impact (Table 6). …”

Section: Winter Zooplanktonmentioning

confidence: 70%

An analysis of long-term winter data on phytoplankton and zooplankton in Neusiedler See, a shallow temperate lake, Austria

Dokulil

Herzig

2009

Aquat Ecol

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In the last 40 years, the shallow steppe lake, Neusiedler See, was ice covered between 0 and 97 days. The North Atlantic Oscillation (NAO) as well as the Mediterranean Oscillation affected the lake and its conditions during winter. Both climate indices correlated negatively with the duration of ice cover and the timing of ice-out. Average winter phytoplankton biomass increased from less than 0.2 (0.05-0.84) mg FM l -1 in the late 1960s/beginning of 1970s to 3.1 (1.72-5.61) mg FM l -1 in the years 2001-2004. The increase in annual winter biomass of phytoplankton was associated with a significant shift in the composition of the algal assemblage. In the winter 1997/1998, diatoms contributed between 40 and 80% to the phytoplankton biomass while in 2006/2007 cyanoprokaryotes contributed 46%. Mean chlorophyll-a concentrations during winter were significantly correlated with those of total phosphorus (P tot ). Together with cold-water species (rotifer Rhinoglena ferto¨ensis), perennial, eurythermal ones (copepod Arctodiaptomus spinosus) contributed to the zooplankton community. High zooplankton numbers were encountered when rotifers, particularly when densities of Rhinoglena ferto¨ensis were high (r 2 = 0.928). Zooplankton abundance and biomass varied from year to year but correlated positively with Chl-a (biomass -r 2 = 0.69; numbers -r 2 = 0.536). Winter zooplankton populations were primarily influenced by winter conditions, but in early winter also by survival of autumn populations, i.e., the more adults of Arctodiaptomus spinosus survived into winter, the higher was the zooplankton biomass in early winter. Phyto-and zooplankton dynamics in shallow lakes of the temperate region seem to critically depend on the biomass in autumn and on winter conditions, specifically on ice conditions and thus are related to climate signals such as the NAO.

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“…Rotifera were totally absent during winter in our samples. The Rotifera population might have been constrained by predatory zooplankton, other predatory animals associated with benthos and periphyton (Brandl, 2005) and also by lack of food (Nandini et al, 2008). Temperature might have also played a role here, as reported by Chen et al (2012) who found that rotifer assemblages followed a temperature gradient which determined its seasonality.…”

Section: ) Special Mention Can Be Made Of Thementioning

confidence: 77%

“…Dominance of copepods has been reported in many Indian water bodies (Shyam, 1991;Varghese and Naik, 1992;Paulose and Maheshwari, 2008). A detailed study on the predation of rotifers by copepods was discussed by Brandl (2005), according to which cyclopoid and calanoid copepodites are effi cient predators of rotifers, often causing a seasonal decline in the rotifer population. Based on their life-history strategies, the maximal rate of natural increase ( r ) occurs in Rotifera followed by Cladocera and Copepoda (Allan, 1976).…”

Section: Discussionmentioning

confidence: 99%

Zooplankton community of Keibul Lamjao National Park (KLNP) Manipur, India in relation to the physico-chemical variables of the water

Sharma

Gupta

Singh

2016

Chin. J. Ocean. Limnol.

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Keibul Lamjao National Park (KLNP), a fl oating park in Loktak Lake, Manipur (India) was studied from Winter (WIN) to Post Monsoon (POM) for its zooplankton composition and some selected water parameters. The resultant data were subjected to multivariate techniques  Principal Component Analysis (PCA) and Canonical Correspondence Analysis (CCA). Analyses of water parameters with PCA revealed that the fi rst PC axis (PC1) accounts for maximum variance in the seasonal data, explaining a variability of 91%. The PCA revealed that the seasonal variability in water parameters was due to the wet and dry cycle of seasons and the stations were distinguished on the basis of transparency and turbidity. Zooplankton abundance was dominated by copepods followed by cladocerans. Temporally, abundance of copepods reached a maximum during Post-monsoon (POM) (3 880 ind./L). Spatially, S6 was found to be most abundant of the other stations in zooplankton. Copepodites and nauplii larvae were the major components of zooplankton. The Rotifera were the least abundant among the three zooplankton groups. Brachionus formed the major component of Rotifera zooplankton at all the stations during the study period. In the Cladocera, Macrothrix was present during all the four seasons, while Pleuroxus , Oxyurella , Kurzia and, Diaphanosoma were rare. The CCA shows that maximal temporal variability in zooplankton abundance was explained by temperature and rainfall. ANOVA revealed no signifi cant diff erence in mean zooplankton abundance among the seasons, but there was a statistically signifi cant diff erence among the sites.

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Freshwater copepods and rotifers: predators and their prey

Cited by 48 publications

References 101 publications

Fish and nutrient enrichment effects on rotifers in a Mediterranean shallow lake: a mesocosm experiment

Fish and nutrient enrichment effects on rotifers in a Mediterranean shallow lake: a mesocosm experiment

An analysis of long-term winter data on phytoplankton and zooplankton in Neusiedler See, a shallow temperate lake, Austria

Zooplankton community of Keibul Lamjao National Park (KLNP) Manipur, India in relation to the physico-chemical variables of the water

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