Evaluating fishery impacts using metrics of community structure

Rice, Jake

doi:10.1006/jmsc.2000.0735

Cited by 157 publications

(89 citation statements)

References 45 publications

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“…It is based in r-K strategy of life cycle, and considers that under stress condition, the diversity decreases and r-strategist species are dominant (BERVOETS et al, 2005). This method is considered a more useful than the univariate ones and is easily contrasted and interpreted (RICE, 2000). Under stress conditions, there is a competitive balance, the diversity decreases, and the dominant species are r -strategists, small size and with short life cycle.…”

Section: Discussionmentioning

confidence: 99%

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

et al. 2017

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Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)The aim of this study was to investigate the ichthyofauna structure in the region of the north outfall of the Bertioga Channel (São Paulo, Brazil) and the possible effects of the environmental quality loss. The samples were collected in a monthly basis, from September to December 2005, at two oceanographic stations with an otter-trawl. The fish fauna structure was evaluated by ecological indicators and the environmental quality evaluated by the ABC analysis and the Estuarine Fish Communities Index (EFCI). A total of 1553 individuals from 50 species were sampled. Ariidae and Sciaenidae amounted to 60 % and Cathorops spixii represented 36 % of all specimens collected. The highest richness and ecological diversity were recorded in December, while the highest numerical abundance was found in October. The majority of the species were represented by juveniles. The cluster analysis and canonical correspondence analysis showed a consistent and clear difference between the sampling stations, and the abiotic factors analyzed (temperature, depth and salinity) do not seem to have influence on the community structure. The ABC analysis suggested a moderate disturbed environment and the EFCI allowed classifying the area as "poor", due to the 12 metrics analyzed, concerning the reduction of the species diversity, composition and abundance, and modifications in the nursery function and trophic integrity of the area.

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Section: Discussionmentioning

confidence: 99%

Ichthyofauna as an environmental quality indicator of the Bertioga Channel, São Paulo (Brazil)

et al. 2017

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“…This research does not necessarily mean that increases in biodiversity due to fishing are always beneficial. For example, fishing can increase evenness and hence that measure of biodiversity because it reduces the abundance of dominant species (23,24). The key point is to minimize fishing impacts on natural diversity to the extent possible because different ecosystem components sustain different ecosystem processes.…”

Section: Impacts Of 6-s Selection On Biodiversity and Fisheriesmentioning

confidence: 99%

Ecosystem-based fisheries management requires a change to the selective fishing philosophy

Zhou

Smith

Punt

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

305

226

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Globally, many fish species are overexploited, and many stocks have collapsed. This crisis, along with increasing concerns over flow-on effects on ecosystems, has caused a reevaluation of traditional fisheries management practices, and a new ecosystem-based fisheries management (EBFM) paradigm has emerged. As part of this approach, selective fishing is widely encouraged in the belief that nonselective fishing has many adverse impacts. In particular, incidental bycatch is seen as wasteful and a negative feature of fishing, and methods to reduce bycatch are implemented in many fisheries. However, recent advances in fishery science and ecology suggest that a selective approach may also result in undesirable impacts both to fisheries and marine ecosystems. Selective fishing applies one or more of the "6-S" selections: species, stock, size, sex, season, and space. However, selective fishing alters biodiversity, which in turn changes ecosystem functioning and may affect fisheries production, hindering rather than helping achieve the goals of EBFM. We argue here that a "balanced exploitation" approach might alleviate many of the ecological effects of fishing by avoiding intensive removal of particular components of the ecosystem, while still supporting sustainable fisheries. This concept may require reducing exploitation rates on certain target species or groups to protect vulnerable components of the ecosystem. Benefits to society could be maintained or even increased because a greater proportion of the entire suite of harvested species is used.balanced exploitation | biodiversity | sustainability | bycatch | 6-S selection

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“…Thus, fishing pressure creates two highly dangerous scenarios for the stability of trophic networks: removing a functional level in the network, or transforming a species previously belonging to a feeding guild and sharing its ecological function with other species, into a key species, which upon being impacted would seriously challenge the stability of the whole ecosystem. Attempts to measure the effect of fishing on community structure based on indices that describe community attributes (equitability, richness, Hill indices, and others) have shown limited success (Piet & Jennings, 2005) because cause-effect relationships as well as the direction of the fishing effect on these indices are unclear (Bianchi et al, 2000;Rice, 2000). Other indicators have also been explored as evidence of fishing effects on populations, communities, and ecosystems (Friedlander & DeMartini, 2002;Fulton et al, 2005).…”

Section: Structural Simplificationmentioning

confidence: 99%