Plankton dynamics in planktivore- and piscivoredominated mesocosms

Bertolo, Andrea; Lacroix, Gérard; Lescher-Moutoué, Françoise; Cardinal-Legrand, C.

doi:10.1127/archiv-hydrobiol/147/2000/327

Cited by 24 publications

(24 citation statements)

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“…By also consuming plant-attached macroinvertebrate grazers (e.g., snails), fish may indirectly enhance periphyton growth as evidenced by experiments [14][15][16] and field data [17]; however, not all investigations concur on this point [18].…”

Section: Introductionmentioning

confidence: 99%

Fish but Not Macroinvertebrates Promote Trophic Cascading Effects in High Density Submersed Plant Experimental Lake Food Webs in Two Contrasting Climate Regions

Iglesias

Mazzeo

Pacheco

et al. 2017

Water

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Predators play a key role in the functioning of shallow lakes. Differences between the response of temperate and subtropical systems to fish predation have been proposed, but experimental evidence is scarce. To elucidate cascading effects produced by predators in contrasting climatic zones, we conducted a mesocosm experiment in three pairs of lakes in Uruguay and Denmark. We used two typical planktivorous-omnivorous fish species (Jenynsia multidentata + Cnesterodon decemmaculatus and Gasterosteus aculeatus + Perca fluviatilis) and one littoral omnivorous-predatory macroinvertebrate (Palaemonetes argentinus and Gammarus lacustris), alone and combined, in numbers resembling natural densities. Fish predation on zooplankton increased phytoplankton biomass in both climate zones, whereas the effects of predatory macroinvertebrates on zooplankton and phytoplankton were not significant in either climate zone. Macroinvertebrates (that freely colonized the sampling devices) were diminished by fish in both climate areas; however, periphyton biomass did not vary among treatments. Our experiments demonstrated that fish affected the structure of both planktonic and littoral herbivorous communities in both climate regions, with a visible positive cascading effect on phytoplankton biomass, but no effects on periphyton. Altogether, fish impacts appeared to be a strong driver of turbid water conditions in shallow lakes regardless of climatic zone by indirectly contributing to increasing phytoplankton biomass.

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Section: Introductionmentioning

confidence: 99%

Fish but Not Macroinvertebrates Promote Trophic Cascading Effects in High Density Submersed Plant Experimental Lake Food Webs in Two Contrasting Climate Regions

Iglesias

Mazzeo

Pacheco

et al. 2017

Water

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“…Generally, the main mechanism of algal control proposed for these biomanipulations is a higher grazing pressure by herbivorous zooplankton, resulting in an increase in water clarity (e.g. Bertolo et al 1999Bertolo et al , 2000. However, a decrease in the biomass of planktonic primary producers has sometimes been observed without any increase in the grazing capacity by zooplanktonic communities (e.g.…”

Section: Introductionmentioning

confidence: 99%

Influence of food web structure on the biochemical composition of seston, zooplankton and recently deposited sediment in experimental freshwater mesocosms

et al. 2010

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The effects of food web structure on the quantity and biochemical composition of seston, zooplankton and recently deposited sediment in experimental freshwater mesocosms were examined. Food web structure was manipulated by addition of zooplanktivorous fish. Biochemical characterisations were carried out using lipid biomarkers (sterols, fatty acids, chlorophyll-derived compounds and long-chain alkanediols). Fish addition decreased zooplankton biomass and increased seston biomass and deposited sediment through a trophic cascade. Fish presence strongly influenced the biochemical characteristics of seston and sediment. In contrast, food web structure had a minor impact on the lipid biomarker composition of zooplankton. Although the relative abundance of sterols in the different compartments did not differ strongly between treatments, sterol profiles in seston and sediment depended on food web structure. The predominance of D 7 -sterols in seston and sediment in the fish treatment indicated a major contribution of Chlorophyceae. In contrast, the distribution of sterols in seston and sediment in the fishless treatment, dominated by cholesterol, indicated a major zooplanktonic input. The distribution of fatty acids and the relative abundance of chlorophyll-derived compounds and long-chain alkanediols agreed with the predominant contribution of phytoplankton or zooplankton to seston and sediment in the two treatments. The relative abundance of bacterial biomarkers suggested that the contribution of bacteria was rather low. The high relative abundance of polyunsaturated fatty acids (PUFAs) and the absence of stanols in sediments suggested low microbial reworking of organic matter in the recently accumulated sediments. The trophic cascade, generated by the addition of fish, increased the relative abundance of PUFAs in deposited organic matter, thus enhancing sediment quality and potential degradability.

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“…In particular, reduction of zooplanktivorous and omnivorous fish often leads to decrease in phytoplankton total biomass through fish-mediated alteration of herbivory pressure by zooplankton. Those effects are either due to a reduction of zooplankton biomass (Carpenter and Kitchell, 1993;Brett and Goldman, 1996;Bertolo et al, 2000), or to an alteration of the specific composition of zooplankton communities without any change in zooplankton biomass (Bertolo et al, 1999b;Okun et al, 2008). The paradigm of trophic cascades has led to the development of ecological techniques such as 'biomanipulations ', aimed at reducing phytoplankton biomass and slowing down deleterious effects of eutrophication.…”

Section: Introductionmentioning

confidence: 99%

Food-web structure and functioning of temperate and tropical lakes: A stoichiometric viewpoint

Danger

Lacroix

Ka³

et al. 2009

Ann. Limnol. - Int. J. Lim.

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-Difficulties to simply transfer trophic cascade theory from temperate to tropical lakes are now well recognized. Many mechanisms trying to explain top-down divergences between these systems have been proposed, such as lack of key species of herbivorous zooplankton, absence of seasonality in fish reproduction, cyanobacteria development, or differences in fish foraging behaviour. Very few studies have considered bottom-up mechanisms, in particular differences in nutrient recycling and nutrient limitation between the two types of ecosystems. According to the ecological stoichiometry theory, fish-induced alterations of food-web structure could modify the efficiency of consumer-driven nutrient recycling by changing the relative biomass contribution of species in food webs. Consequently, by mostly considering top-down processes, one could underestimate consequences on nutrient availability for phytoplankton growth. In this paper, we compared the results of two mesocosm experiments carried out in temperate and tropical areas, each manipulating foodweb structure via the presence or absence of fish. We found trophic cascades in both experiments, but differences between fishless and fish treatments were greater in temperate than in tropical systems. In the tropical experiment, the observed effects could not be supported by classical zooplankton community alteration or by cyanobacteria prevalence. Our results suggest a key contribution of fish nitrogen-excretion to phytoplankton growth in mostly nitrogen-limited tropical systems. Differences in stoichiometric response to food-web structure alteration between temperate and tropical lakes could thus represent a major difference between the two systems. Our study stresses the need for further studies that would allow robust generalization on the functioning of freshwater temperate and tropical ecosystems.

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Plankton dynamics in planktivore- and piscivoredominated mesocosms

Cited by 24 publications

References 0 publications

Fish but Not Macroinvertebrates Promote Trophic Cascading Effects in High Density Submersed Plant Experimental Lake Food Webs in Two Contrasting Climate Regions

Fish but Not Macroinvertebrates Promote Trophic Cascading Effects in High Density Submersed Plant Experimental Lake Food Webs in Two Contrasting Climate Regions

Influence of food web structure on the biochemical composition of seston, zooplankton and recently deposited sediment in experimental freshwater mesocosms

Food-web structure and functioning of temperate and tropical lakes: A stoichiometric viewpoint

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