Negative effect of turbidity on prey capture for both visual and non‐visual aquatic predators

Ortega, Jean C. G.; Figueiredo, Bruno R. S.; Graça, Weferson Júnio da; Agostinho, Ângelo Antônio; Bini, Luis Maurício

doi:10.1111/1365-2656.13329

Cited by 53 publications

(38 citation statements)

References 221 publications

(282 reference statements)

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“…Such changes in the turbidity and sedimentary organic matter clearly indicate a markedly reduction of physical disturbance on the benthic habitat. Past studies demonstrated that capture rates of predators decreased with an increase in turbidity (Ortega et al, 2020); however, piscivorous fishes tend to consume more prey and possess greater population sizes in low turbidity conditions (De Robertis et al, 2003;Wenger et al, 2013). Our study also concurred with the above findings by showing a negative relationship between the biomass of P. indicus and turbidity, suggesting that P. indicus improved their foraging efficiency under less turbid environment.…”

Section: Discussionsupporting

confidence: 90%

Improvements of Population Fitness and Trophic Status of a Benthic Predatory Fish Following a Trawling Ban

Tao

Mak

et al. 2021

Front. Mar. Sci.

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Trawl fisheries have been shown to cause overfishing and destruction of benthic habitats in the seabed. To mitigate these impacts, a trawling ban has been enforced in Hong Kong waters since December 31, 2012 to rehabilitate the ecosystem and enhance fisheries resources. Previous studies demonstrated that reduced trawling activities would increase the heterogeneity of benthic habitats, thereby enhancing species richness and abundance of benthic fauna and providing more prey resources for predatory fishes. This study aimed to test a hypothesis that the population and trophic dynamics of the Bartail flathead Platycephalus indicus, a heavily fished benthic predatory fish, at inner and outer Tolo Channel of Hong Kong (i.e., EI and EO) improved with increases in their body size, abundance, biomass, trophic niche, and trophic position after the trawl ban. Samples were collected from trawl surveys before and after the trawl ban to compare the pre-ban and post-ban populations of P. indicus from EI and EO. Body size, abundance, and biomass were assessed in 2004, 2013–2014, and 2015–2016, whereas trophic niche and trophic position were analyzed based on stable isotopes of fish samples collected in dry season of 2012, 2015, and 2018. Following the trawl ban, the abundance and biomass of P. indicus increased in EO, with body size increased in EI. Furthermore, as indicated by the results of stable isotope analysis (SIA) on their tissues and prey items, trophic niche, and trophic position of P. indicus increased in EI and EO, respectively. Our study demonstrated that the trawl ban had promoted the recovery of a predatory fish population through restoring size structure and trophic dynamics.

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Section: Discussionsupporting

confidence: 90%

Improvements of Population Fitness and Trophic Status of a Benthic Predatory Fish Following a Trawling Ban

Tao

Mak

et al. 2021

Front. Mar. Sci.

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“…For instance, the trout group (module 2) showed affinity to smaller lakes with greater Secchi depth, which serves as an integrative proxy for multiple terrestrial factors (e.g., sediment loading) and internal productivity (Tilzer, 1988). Smaller lakes with greater water clarity may therefore provide greater open‐water foraging success for salmonids (Ortega et al., 2020). In contrast, the northern group (module 4) was linked to larger lakes with greater influence of shield lithology, in addition to those with reduced water clarity (as encountered in areas overlaying glacial lake beds).…”

Section: Discussionmentioning

confidence: 99%

Bioregions are predominantly climatic for fishes of northern lakes

Loewen

Jackson

Chu

et al. 2021

Global Ecol Biogeogr

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Aim: Recurrent species assemblages integrate important biotic interactions and joint responses to environmental and spatial filters that enable local coexistence. Here, we applied a bipartite (site-species) network approach to develop a natural typology of lakes sharing distinct fish faunas and provide a detailed, hierarchical view of their bioregions. We then compared the roles of key biogeographical factors to evaluate alternative hypotheses about how fish communities are assembled from the regional species pool.

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“…Features of a complex heterogeneous environment and the presence of multidirectional flows form turbulence and turbidity in the water column of riverbed depressions (Mochek et al, 2019). These factors can have a protective effect on non-predatory fish (Figueiredo et al, 2016;Ehlman et al, 2019;Ortega et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Meander reshaping – the formation process of a wintering riverbed depression of fish

Chemagin

2021

Biosys. divers.

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The study of the spatiotemporal distribution of fish is an important and poorly studied aspect of the ecology of aquatic organisms. The research work was performed using the modern hydroacoustic method and geographic information systems. A section in the lower reaches of the Irtysh, a large transboundary Siberian river (in Western Siberia, Russian Federation), was studied. It has a strong development of meandering. The merging (i.e., reshaping of closely spaced meanders and erosion-accumulating channel processes) results in development of wintering riverbed depression, which is a critical “temporal bottleneck” during the winter period of the fish life cycle. The average density of fish in the study area in summer and autumn was 8,031 and 9,194 individuals per ha, respectively. Analysis of the distribution of fish showed that the distribution in the horizontal aspect had a more aggregated character in the autumn. In the vertical aspect, it had a more surface (pelagic) character. The ichthyofauna in the water area of the riverbed depression is mainly represented by cyprinids. The loop-shaped evolution of the channel formed a section of the river with multidirectional, circulating, and counter-current flows. It also created zones with depths exceeding 20 m and aggregations of fish. These features characterize the studied water area as a wintering riverbed depression of the fish of the Lower Irtysh. This section of the river should be included in the list of protected wintering biotopes of fish in the West Siberian fishery basin, which will ensure the conservation of fish at the critical stage of the life cycle.

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Negative effect of turbidity on prey capture for both visual and non‐visual aquatic predators

Abstract: The outcome of interactions between predators and prey can shape the structure of an entire community, influencing species composition, size structure and spatial distribution (Englund,

Cited by 53 publications

References 221 publications

Improvements of Population Fitness and Trophic Status of a Benthic Predatory Fish Following a Trawling Ban

Improvements of Population Fitness and Trophic Status of a Benthic Predatory Fish Following a Trawling Ban

Bioregions are predominantly climatic for fishes of northern lakes

Meander reshaping – the formation process of a wintering riverbed depression of fish

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