Trophic Characterization, Pelagic Food Web Structure and Comparison of Two Mesotrophic Lakes in Brandenburg (Germany)

Kasprzak, Peter; Gervais, Frank; Adrian, Rita; Weiler, Winfried; Radke, Robert J.; Jäger, Ines; Riest, Silke; Siedel, Ulrike; Schneider, Bernd Uwe; Böhme, M.; Eckmann, Reiner; Walz, Norbert

doi:10.1002/(sici)1522-2632(200004)85:2/3<167::aid-iroh167>3.3.co;2-l

Cited by 15 publications

(28 citation statements)

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“…We cannot exclude, however, that there might Lake nutrient subsidy by fish feeding be some decisive subsidy of terrestrial-derived excreted SRP to lake phytoplankton during the late spring and summer months. In particular between May and July 2002, epilimnetic SRP concentrations were often Ͻ2 g L Ϫ1 (for seasonal data for previous years, see Kasprzak et al 2000). The average lakewide daily excretion rates of bleak from terrestrial insects were 0.33 g phosphorus L Ϫ1 but were highest during the summer (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…It can be assumed, therefore, that bleak is competitively inferior against both roach and perch while the fishes feed on scarce zooplankton resources. Indeed, zooplankton species and size structure in Lake Großer Vätersee reflect a strong top-down control by fishes, because Eudiaptomus graciloides was the numerically dominating crustacean species and the small Daphnia hyalina and D. hyalina ϫ galeata were the dominant cladocerans (Kasprzak et al 2000). A limited zooplankton availability to the fish is further corroborated by the low annual growth rates of roach, indicated by an average length of 107 mm for 3ϩ fish (Haertel and Eckmann 2002).…”

Section: Discussionmentioning

confidence: 99%

“…The study was conducted in the mesotrophic Lake Großer Vätersee (0.121 km 2 ; maximum depth, 11.5 m; mean depth, 5.2 m; volume, 633,000 m 3 ) (for more details, see Kasprzak et al 2000), situated in the Baltic lake region of northeast Germany, ϳ80 km north of Berlin. The lake is of glacial origin, has no surface in-or outflows, and is mainly surrounded by mixed or coniferous forest.…”

Section: Methodsmentioning

confidence: 99%

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Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

et al. 2005

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We estimated consumption and excretion rates of terrestrial-borne phosphorus by a population of the insectfeeding fish species bleak (Alburnus alburnus) in a 0.12-km 2 mesotrophic lake of the German lowlands. Fish abundance, growth rates, and diet composition were determined, and consumption and nutrient metabolism were calculated by a bioenergetics model. Mean bleak abundance was about 77,000 ind. km Ϫ2. About 84% of bleak consumption consisted of terrestrial insects. Annual consumption of lake-external phosphorus (P) by bleak was 432 g, representing ϳ2.1% of the lake internal P-pool. Annual excretion of terrestrial-derived phosphorus by bleak was equivalent to ϳ11% of the mean epilimnetic SRP concentration. A substantial subsidy of lake nutrient pools by insectivorous fish is more likely in lakes Ͻ0.03 km 2 owing to the increasing perimeter-to-area ratio between donor and recipient habitats. Terrestrial nutrient subsidy by fish feeding may be important only in small oligotrophic lakes in forested areas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

et al. 2005

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“…In the littoral zone, the nets were set perpendicular to the shoreline at the bottom. In the pelagic zone, floating nets 6 m high were used, fishing almost the entire zone where fish can survive as the lake is thermally stratified from late April to late October, with an anoxic zone beginning at about 7 m deep (Kasprzak et al 2000). The nets were set for 2 h during day (1000-1200) and immediately after nightfall.…”

Section: Fishing Food Analyses and Abundance Estimatesmentioning

confidence: 97%

“…The mesotrophic lake has no inflow or outflow, the water level depends on groundwater and the catchment is mostly covered by forest (see Kasprzak et al (2000) for further details). Most of the lakeshore and the adjacent littoral zones are covered by reed (Phragmites australis) and Chara sp.…”

Section: Study Sitementioning

confidence: 99%

Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake

Schulze¹,

Baade²,

Dörner³

et al. 2006

Can. J. Fish. Aquat. Sci.

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Although the effects of introduced predators on prey populations in aquatic ecosystems have been studied frequently, less is known about the interactions between predators. We performed a whole-lake experiment by stocking a non-native top predator (pikeperch (Sander lucioperca)) to two residential piscivores (Eurasian perch (Perca fluviatilis) and northern pike (Esox lucius)). By analyzing spatial distribution, diet composition, growth, and consumption rates of the piscivores before and after pikeperch introduction, we tested how both density-dependent and trait-mediated responses affected interactions between the three predators. Total piscivore biomass increased 1.5 times and annual consumption by the piscivores increased 1.7 times after stocking, attributable to the stocked pikeperch and increased northern pike abundances. Abundance, distribution, and consumption data indicated that northern pike was hardly affected by pikeperch stocking and even increased its biomass, whereas piscivorous perch shifted its habitat use towards the littoral lake areas in response to competition with pikeperch. Furthermore, all piscivores increasingly fed on small perch. The forced habitat shift of piscivorous perch in combination with increased predation on small perch led to a decreased abundance of large perch, attributable to the compensatory effects of intraguild predation and cannibalism.Résumé : Alors que les effets des prédateurs introduits sur les populations de proies dans les écosystèmes aquatiques ont souvent été étudiés, les interactions entre les prédateurs eux-mêmes sont moins bien connues. Dans une expérience à l'échelle d'un lac, nous avons ajouté un prédateur supérieur non indigène (« pikeperch » (Sander lucioperca)) à un peuplement de poissons ichtyophages résidents (la perche (Perca fluviatilis) et le grand brochet (Esox lucius)).

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Population Density of the Crayfish, Orconectes limosus, in Relation to Fish and Macroinvertebrate Densities in a Small Mesotrophic Lake – Implications for the Lake's Food Web

Haertel‐Borer

Zak

Eckmann

et al. 2005

International Review of Hydrobiology

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The population density of Orconectes limosus in a mesotrophic lake was assessed in the context of fish and macroinvertebrate biomasses, and crayfish consumption by fish. The average O. limosus (≥6 cm total length) abundance and biomass in the littoral zone was 2200 ind ha -1 and 32.2 kg ha 1 , respectively. O. limosus biomass accounted for a large percentage (49%) of the lake's macroinvertebrate biomass. O. limosus was equal to 35% of the non-predatory fish biomass and to 81% of the predatory fish biomass. O. limosus comprised 15 and 48% of the annual consumption of pike and predatory perch, respectively. Altogether, O. limosus was identified as quantitatively important for the lake's littoral food web, and might also subsidize the pelagic food web. This strengthens the need for an integrated view on lake food webs.

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Trophic Characterization, Pelagic Food Web Structure and Comparison of Two Mesotrophic Lakes in Brandenburg (Germany)

Cited by 15 publications

References 0 publications

Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

Can feeding of fish on terrestrial insects subsidize the nutrient pool of lakes?

Response of the residential piscivorous fish community to introduction of a new predator type in a mesotrophic lake

Population Density of the Crayfish, Orconectes limosus, in Relation to Fish and Macroinvertebrate Densities in a Small Mesotrophic Lake – Implications for the Lake's Food Web

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