Fish community response to the longitudinal environmental gradient in Czech deep-valley reservoirs: Implications for ecological monitoring and management

Vašek, Mojmír; Prchalová, Marie; Říha, Milan; Blabolil, Petr; Čech, Martin; Draštík, Vladislav; Frouzová, Jaroslava; Jůza, Tomáš; Kratochvíl, Michal; Muška, Milan; Sajdlová, Zuzana; Šmejkal, Marek; Tušer, Michal; Vejřík, Lukáš; Znachor, Petr; Mrkvička, Tomáš; Seďa, Jaromír; Kubečka, Jan

doi:10.1016/j.ecolind.2015.11.061

Cited by 35 publications

(28 citation statements)

References 76 publications

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“…The presence of extremely high predation pressure in the Vír Reservoir in 2010 is supported by the occurrence of small-sized Daphnia cucullata in the dam section. This species commonly occurs only in the tributary section of reservoirs [ 44 , 56 ] where high fish biomass induces high predation pressure on zooplankton [ 57 ]. High predation pressure on zooplankton from YOY perch is also apparent from the gut content of other cyprinids.…”

Section: Discussionmentioning

confidence: 99%

Who Is Who: An Anomalous Predator-Prey Role Exchange between Cyprinids and Perch

et al. 2016

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Piscivory in cyprinids (Cyprinidae) is extremely rare. Specifically, common bream (Abramis brama) and common carp (Cyprinus carpio) are zooplanktivorous fish in deep lentic waters. Nevertheless, we observed predation by these two cyprinids under natural conditions in the Vír Reservoir, Czech Republic. We conducted diet analysis for cyprinids caught by trawling and gillnets and the large amount of young-of-the-year (YOY) perch (Perca fluviatilis), with sizes of 37–52 mm standard length, were found in their digestive tracts. In 2010, a large amount of YOY perch caused a significant decrease in Daphnia spp. size and abundance in the reservoir. Hence, a food deficit was induced for the cyprinids, apparent also from the poor nutritional condition of common bream which was much worse than the condition of those in similar reservoirs. Common carp and common bream shifted to forced piscivory, and they utilized the YOY perch as an alternative food source. In contrast, smaller species, such as roach (Rutilus rutilus) and bleak (Alburnus alburnus), widely utilized planktonic cyanobacteria. In the following year, YOY perch occurred in significantly lower numbers and conversely, Daphnia spp. size and abundance were significantly higher. The forced piscivory was not observed. Our results indicate a switch to forced piscivory by cyprinids, which was caused by a shortage of their natural food source. Moreover, this phenomenon presents an effective mechanism for reduction in the numbers of YOY perch, ensuring the stability of the ecosystem.

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Section: Discussionmentioning

confidence: 99%

Who Is Who: An Anomalous Predator-Prey Role Exchange between Cyprinids and Perch

et al. 2016

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“…The study was carried out in two reservoirs located in South Bohemia, (Čech et al, 2009;Vašek et al, 2016). Asp and pikeperch naturally reproduce in both reservoirs Jůza et al, 2013).…”

Section: Study Sitesmentioning

confidence: 99%

“…In contrast, Římov Reservoir (hereafter Římov; 48°51′00″N, 14°29′28″E), situated on the Malše River, is a deep canyon-type lake (Table 1) that is strongly thermally stratified during the summer season. Both reservoirs have similar water clarity and a moderately eutrophic trophic status (Table 1) (Čech et al, 2009;Vašek et al, 2016). Asp and pikeperch naturally reproduce in both reservoirs Jůza et al, 2013).…”

Section: Study Sitesmentioning

confidence: 99%

Stable isotopes and gut contents indicate differential resource use by coexisting asp (Leuciscus aspius) and pikeperch (Sander lucioperca)

Vašek

Eloranta

Vejříková

et al. 2018

Ecology of Freshwater Fish

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Differential use of habitat and prey resources is an important mechanism that may allow coexistence of sympatric species. Unlike interactions between smaller cyprinid and percid fishes, the resource use by coexisting predatory asp (Leuciscus aspius) and pikeperch (Sander lucioperca) is relatively unknown. Here, gut content and stable isotope analyses were used to study ontogenetic dietary shifts and interspecific trophic niche overlap between asp and pikeperch coexisting in two reservoirs. The hypothesis that both species show an ontogenetic dietary shift from small invertebrates to large fish prey, but at the same time use different prey resources to reduce potential competitive interactions, was validated. The isotopic niches of the two predators showed no, or only a moderate, degree of overlap (0%-65%). The ontogenetic changes in the degree of interspecific isotopic niche overlap were different in the two reservoirs, suggesting that trophic segregation can be dynamic and variable among systems. Gut contents revealed that small (<100 mm standard length) asp consumed mostly terrestrial invertebrates and emerged aquatic insects, whereas small pikeperch foraged on zooplankton, larval and pupal stages of aquatic insects and fish. Larger individuals (>100 mm) of both species were predominantly piscivorous, with asp consuming more cyprinid prey and pikeperch more percid prey.Coexisting asp and pikeperch populations are able to utilise different prey resources, thereby reducing potential negative competitive interactions. K E Y W O R D Sdietary ontogeny, foraging strategy, interspecific competition, piscivory, stable isotopes

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“…Perch switch predominantly to piscivory when they reach two years of age and they exploit the open water zone (Parker et al, 2009). Unlike cyprinids, perch are efficient competitors and predators in clear water (Diehl, 1988;Radke & Gaupisch, 2005) and this species has a higher biomass in less productive, downstream areas (Va sek et al, 2016). Perch swim continuously parallel to the bank during the day and get close to the littoral zone to rest at night, exhibiting routine homing behavior (Zamora & Moreno-Amich, 2002).…”

Section: Complementarity Of Two High-resolution Spatiotemporal Methodsmentioning

confidence: 99%

Complementarity of two high-resolution spatiotemporal methods (hydroacoustics and acoustic telemetry) for assessing fish distribution in a reservoir

Goulon

Westrelin²,

Samedy

et al. 2018

Hydroécol. Appl.

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The complementarity of two high-resolution spatiotemporal acoustic methods, telemetry and hydroacoustics, was evaluated during the same time window to obtain fish distribution in a canyon-shaped reservoir, the Bariousses Reservoir (France). These methods act at an individual scale for telemetry and a community scale for hydroacoustics. The temporal scales are also different: telemetry offers continuous and long-term monitoring while a “snapshot” view is given by hydroacoustics. Day and night hydroacoustic surveys were carried out in this reservoir, during a 24-hour period in spring, using vertical and near-surface horizontal beaming. During this time window, 11 adult fish (length: 22–57 cm) from three species (roach, perch, and pikeperch) were tracked by telemetry. Four metrics were calculated with data collected by application of the two methods: distance to the nearest bank, distance to the tributary, fish depth, and bottom depth at the location. The contrasting (distance to the nearest bank, bottom depth) or partially similar results (distance to the tributary, fish depth) can be explained by the limitations associated with each method. The results obtained with telemetry are very sensitive to the species composition and the size of the tagged fish. The number of fish located in the epibenthic areas of the reservoir can be underestimated by hydroacoustics. This preliminary case study highlights that these methods act in a complementary way and their simultaneous use can provide better information on fish spatial distribution.

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Fish community response to the longitudinal environmental gradient in Czech deep-valley reservoirs: Implications for ecological monitoring and management

Cited by 35 publications

References 76 publications

Who Is Who: An Anomalous Predator-Prey Role Exchange between Cyprinids and Perch

Who Is Who: An Anomalous Predator-Prey Role Exchange between Cyprinids and Perch

Stable isotopes and gut contents indicate differential resource use by coexisting asp (Leuciscus aspius) and pikeperch (Sander lucioperca)

Complementarity of two high-resolution spatiotemporal methods (hydroacoustics and acoustic telemetry) for assessing fish distribution in a reservoir

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