Bottom-Up Effects on Biomass Versus Top-Down Effects on Identity: A Multiple-Lake Fish Community Manipulation Experiment

Lemmens, Pieter; Declerck, Steven; Tuytens, Karen; Vanderstukken, Maarten; Meester, Luc De

doi:10.1007/s10021-017-0144-x

Cited by 38 publications

(20 citation statements)

References 55 publications

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“…Furthermore, fish biomass in lakes is primarily driven by bottom-up effects (e.g. Hanson & Leggett, 1982; Lemmens et al , 2018; Matsuzaki et al , 2018) – a finding also revealed in our study at the aggregate biomass level, which did not differ among lake types despite radically different fish community composition. As species richness was substantially lower in unmanaged lakes, the lake type-specific small-bodied non-game species that colonized unmanaged lakes can reach higher biomasses and abundances in these lakes types compared to managed lakes.…”

Section: Discussionsupporting

confidence: 83%

Impact of recreational fisheries management on fish biodiversity in gravel pit lakes with contrasts to unmanaged lakes

Matern

Emmrich²,

Klefoth³

et al. 2018

Preprint

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20Gravel pit lakes constitute novel ecosystems that can be colonized by fishes through 21 natural or anthropogenic pathways. Many of these man-made lakes are used by 22 recreational anglers and experience regular fish stocking. Recreationally unmanaged 23 gravel pits may also be affected by fish introductions, e.g., through illegal fish 24 releases, thereby contributing to the formation of site-specific communities. Our 25 objective was to compare the fish biodiversity in gravel pit lakes with and without the 26 recent influence of recreational fisheries management. We sampled 23 small (< 20 27 ha) gravel pit lakes (16 managed and 7 unmanaged) in north-western Germany and 28 compared fish community and diversity metrics obtained using littoral electrofishing 29 and multimesh gillnet catch per unit effort data. Given the size of the lakes we 30 sampled we expected species poor communities and elevated fish diversity in the 31 managed systems due to stocking. The two lake types were primarily mesotrophic 32 and did not differ in key abiotic and biotic environmental characteristics. Both lakes 33 types hosted similar fish abundance and biomass, but were substantially different in 34 terms of the fish community structure and species richness. Fish were present in all 35 lakes with at least three species. We discovered a higher α-diversity and a lower β-36 diversity in managed gravel pit lakes compared to unmanaged lakes. Thus, 37 recreational fisheries management appeared to foster homogenization of fish 38 communities, likely because fisheries managers stock these lakes with desired fish 39 species (e.g., piscivorous fishes and large bodied cyprinids). However, we also 40 detected anthropogenic pathways in the colonization of unmanaged gravel pit lakes, 41 presumably from illegal releases by private people. Importantly, hardly any non-42 native species were detected in the gravel pits we studied, suggesting that 43 recreational fisheries management not necessarily promotes the spread of exotic 44 species. 45 Fish conservation; novel ecosystems; non-native species; fish stocking; recreational 47 fishing; fish community composition 48 49 Significance Statement 50 3Little is known about fish communities in artificially created gravel pit lakes. We 51 compared those managed by recreational fishers with those lacking fisheries 52 management in north-western Germany. We found fishes in all gravel pit lakes and 53 demonstrated a higher α-diversity but more homogenized fish communities in 54 managed gravel pit lakes compared to unmanaged lakes. We did not detect the 55 establishment of relevant abundances of non-natives fishes despite intensive 56 fisheries management. 57 58

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Section: Discussionsupporting

confidence: 83%

Impact of recreational fisheries management on fish biodiversity in gravel pit lakes with contrasts to unmanaged lakes

Matern

Emmrich²,

Klefoth³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…cladocerans such as Bosmina longirostris, Dunhevedia, and cyclopoid copepods) of fish. This is in line with earlier investigations on the impact of predation by fish on zooplankton (Lemmens, Declerck, Tuytens, Vanderstukken, & De Meester, 2018;Mamani, Koncurat, & Boveri, 2019).…”

Section: Effects Of Lhc On the Taxonomic And Trait Community Compossupporting

confidence: 93%

Lateral hydrological connectivity differentially affects the community characteristics of multiple groups of aquatic invertebrates in tropical wetland pans in South Africa

et al. 2019

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River–floodplain connectivity (i.e. lateral hydrological connectivity, LHC) can directly affect the community characteristics by promoting dispersal of organisms but can also have profound indirect effects by altering local habitat characteristics. A major challenge is to disentangle the relative importance of direct and indirect effects of LHC on organisms. Combining taxonomic data with trait information allows a more mechanistic understanding of how LHC affect biotic communities in floodplains. Here, we attempted to determine the relative importance of the direct and indirect effects of LHC on local environmental variables and community characteristics (taxonomic and trait composition) of three different taxonomic organism groups in a set of 33 temporary floodplain pans along a gradient of LHC. In addition, we specifically aimed to unravel the underlying mechanisms shaping patterns of taxonomic diversity by partitioning compositional dissimilarity between ponds into components of nestedness and spatial turnover. Variation partitioning revealed that most differences in macroinvertebrate and zooplankton community composition between pans resulted from variation in local environmental variables, particularly macrophyte cover and the presence of fish. For large branchiopod crustaceans, however, partitioning indicated that LHC did significantly affect both taxonomic and trait community composition, and reduced local taxon diversity. Partitioning taxonomic and trait β‐diversity showed that community dissimilarity between pans was largely determined by turnover, rather than by nestedness. Overall, our study revealed that the effects of LHC on aquatic invertebrate communities act mainly indirectly by altering local environmental conditions. Although the effects of LHC were significant, they were small compared to those of environmental variables. Our results from the partitioning of taxonomic and trait β‐diversity have important implications for biodiversity conservation efforts in the Ndumo region. We demonstrate the need to conserve multiple pans along the LHC gradient to sustain high regional diversity. A common practice in the study area mainly focuses on the conservation of river‐connected or larger pans.

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“…Submerged plant communities play a central role in the ecological condition and sustainability of freshwater systems, and changes in the abundance and composition of such communities may have significant effects, not least on water quality. In shallow lakes, submerged plants play a key role in suppressing phytoplankton growth (Lemmens et al, 2018) and improving and maintaining water clarity. Any impact of common carp activities is thus likely to be ecologically significant.…”

Section: Introductionmentioning

confidence: 99%

Effects of common carp (Cyprinus carpio) on water quality in aquatic ecosystems dominated by submerged plants: a mesocosm study

Xiaochang

Mei

Razlutskij

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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Common carp (Cyprinus carpio) have been introduced into aquatic systems across the world, where their benthivorous feeding behavior has resulted in serious water quality problems. A 12-week mesocosm experiment was set up to test the hypotheses that common carp increase water column nutrient levels and decrease water clarity in aquatic ecosystems dominated by submerged plants. Further, we tested whether the effect of common carp on macrophytes depended on the species of plants. Relative to the controls, the presence of carp decreased water clarity by increasing total suspended solids (TSS) and light attenuation. However, levels of total nitrogen (TN) and total phosphorus (TP) in the water column were reduced. No significant change in phytoplankton biomass (measured as chlorophyll a) and the biomass of Hydrilla verticillata was observed between common carp treatment mesocosms and controls, but the common carp did reduce the biomass of the submerged macrophyte Vallisneria denseserrulata. We conclude that removal of common carp is likely to improve water clarity in aquatic ecosystems dominated by submerged plants primarily by decreasing TSS and that the effect of common carp on macrophytes is stronger for the meadow forming Vallisneria than for the canopy forming Hydrilla.

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Bottom-Up Effects on Biomass Versus Top-Down Effects on Identity: A Multiple-Lake Fish Community Manipulation Experiment

Cited by 38 publications

References 55 publications

Impact of recreational fisheries management on fish biodiversity in gravel pit lakes with contrasts to unmanaged lakes

Impact of recreational fisheries management on fish biodiversity in gravel pit lakes with contrasts to unmanaged lakes

Lateral hydrological connectivity differentially affects the community characteristics of multiple groups of aquatic invertebrates in tropical wetland pans in South Africa

Effects of common carp (Cyprinus carpio) on water quality in aquatic ecosystems dominated by submerged plants: a mesocosm study

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