Have fishes had their chips? The dilemma of threatened fishes

Bruton, Michael N.

doi:10.1007/bf00001812

Cited by 135 publications

(99 citation statements)

References 97 publications

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“…The freshwater ecosystem is the system that is most threatened globally (Sala et al, 2000), and freshwater fish rank second only to amphibians as endangered biota (Bruton, 1995). However, large civil engineering projects that affect rivers, such as dam and weir construction, dredging, and reclamation, proceed apace.…”

Section: Introductionmentioning

confidence: 99%

Distribution patterns of fish communities with respect to environmental gradients in Korean streams

Yoon

Kim

Byeon

et al. 2011

Ann. Limnol. - Int. J. Lim.

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-Stream development can generate environmental changes that impact fish communities. In temperate streams, the distribution of fish species is associated with environmental gradients. To analyze the relevant factors, large-scale exploration is required. Thus, to evaluate the distribution patterns of fish in Korea, sampling was conducted on a national scale at 720 sites over a 6-week period in 2009. A total of 124 fish species in 27 families were identified; Zacco platypus and Zacco koreanus of the Cyprinidae were the dominant and subdominant species, respectively. Of the species found, 46 (37.1%) were endemic and 4 (3.2%) exotic; of the latter, Micropterus salmoides and Lepomis macrochirus were widely distributed. Upon canonical correspondence analysis (CCA), both altitude and biological oxygen demand (BOD) were highly correlated with CCA axes 1 and 2, respectively. This explained 62.5% of the species-environment relationship. Altitude and stream order were longitudinally related to species distribution. The numbers of both total and endemic species gradually increased as streams grew in size to the fourth-fifth-order, and decreased in sixth-order, streams. Overall, fish communities were stable throughout the entire watershed, whereas some species showed site-specific occurrence patterns due to the paleogeomorphological characteristics of Korean peninsula. However, various anthropogenic activities may negatively affect fish communities. Therefore, both short-and long-term sustainable management strategies are required to conserve native fish fauna.

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Section: Introductionmentioning

confidence: 99%

Distribution patterns of fish communities with respect to environmental gradients in Korean streams

Yoon

Kim

Byeon

et al. 2011

Ann. Limnol. - Int. J. Lim.

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“…Freshwater fishes are not only the most diverse group of vertebrates but also the one that features the greatest proportion of threatened species (Bruton, 1995;Leidy and Moyle, 1998;Duncan and Lockwood, 2001). The relatively limited space occupied by freshwater fishes (i.e.…”

Section: Introductionmentioning

confidence: 99%

Fish fauna in Iberian Mediterranean river basins: biodiversity, introduced species and damming impacts

Clavero

Blanco

Prenda

2004

Aquatic Conservation

143

137

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1.We used a basin approximation to analyse distribution patterns of different components of biodiversity (taxonomic richness, endemicity, taxonomic singularity, rarity) and conservation status of freshwater fish fauna in 27 Mediterranean Iberian rivers. 2.Basin area alone explained more than 80% of variation in native species richness. Larger basins featured not only a higher number of native species, but also more endemic and rare species and less diversified genera than smaller ones. 3.In contrast, smaller basins scored higher community conservation values, due to their lower degree of invasion by introduced species. 4.The presence of dams was the most important factor determining the conservation status of fish communities, and it was also positively associated with the number of introduced species. 5.While the most important components of Iberian freshwater fish biodiversity are located in large basins, small unregulated ones feature better conserved fish communities.2

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“…The population dynamic models used in these tasks generally describe only the harvested species and do not account for their interactions with the wider ecosystem. This approach is partly responsible for the widespread failure to maintain the desired abundance of fish stocks (Hutchings, 1996), to prevent fishing operations from damaging other parts of the ecosystem (Turner et al, 1999), and to control the impact of other human activities on fisheries (Bruton, 1995). It is now widely acknowledged that fisheries must be managed in a way that recognises their interdependence with the wider ecosystem.…”

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confidence: 99%

Modelling Southern Ocean ecosystems: krill, the food-web, and the impacts of harvesting

Hill¹,

Murphy²,

Reid³

et al. 2006

Biol. Rev.

106

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The ecosystem approach to fisheries recognises the interdependence between harvested species and other ecosystem components. It aims to account for the propagation of the effects of harvesting through the food-web. The formulation and evaluation of ecosystem-based management strategies requires reliable models of ecosystem dynamics to predict these effects. The krill-based system in the Southern Models of the Southern Ocean ecosystem. 2Ocean was the focus of some of the earliest models exploring such effects. It is also a suitable example for the development of models to support the ecosystem approach to fisheries because it has a relatively simple food-web structure and progress has been made in developing models of the key species and interactions, some of which has been motivated by the need to develop ecosystem-based management. Antarctic krill, Euphausia superba, is the main target species for the fishery and the main prey of many top predators. It is therefore critical to capture the processes affecting the dynamics and distribution of krill in ecosystem dynamics models. These processes include environmental influences on recruitment and the spatially variable influence of advection. Models must also capture the interactions between krill and its consumers, which are mediated by the spatial structure of the environment. Various models have explored predator-prey population dynamics with simplistic representations of these interactions, while others have focused on specific details of the interactions. There is now a pressing need to develop plausible and practical models of ecosystem dynamics that link processes occurring at these different scales.Many studies have highlighted uncertainties in our understanding of the system, which indicates future priorities in terms of both data collection and developing methods to evaluate the effects of these uncertainties on model predictions. We propose a modelling approach that focuses on harvested species and their monitored consumers and that evaluates model uncertainty by using alternative structures and functional forms in a Monte Carlo framework.

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Have fishes had their chips? The dilemma of threatened fishes

Cited by 135 publications

References 97 publications

Distribution patterns of fish communities with respect to environmental gradients in Korean streams

Distribution patterns of fish communities with respect to environmental gradients in Korean streams

Fish fauna in Iberian Mediterranean river basins: biodiversity, introduced species and damming impacts

Modelling Southern Ocean ecosystems: krill, the food-web, and the impacts of harvesting

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