A review of a model for qualitative evaluation of exploitation levels in multi-species fisheries
A review of a model for qualitative evaluation of exploitation levels in multi-species fisheries
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DOI：
10.1046/j.1365-2400.1999.00137.x
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发表时间：
1999-02
影响因子：
2
通讯作者：
R. Welcomme
中科院分区：
文献类型：
--
作者：
R. Welcomme
内陆沃茨的动物群，特别是在热带地区，由许多物种的复杂组合组成，无法通过传统的种群评估方法进行分析。制定管理和养护政策需要有其他模式，能够预测这种组合在捕鱼或其他压力下的变化方式。从历史上看，根据简单参数对物种进行分组的模式已证明足以提供必要的咨询意见，以表明生态系统健康和渔业产量的可持续性。这种模式受到的关注相对较少，可以进一步发展和完善。本审查的结论是，在各种解释变量中，捕获的鱼的平均长度是最重要的变量之一，其他变量还有捕获物中的物种数量和在波动系统中捕获物应对洪水所需的时间。更复杂的指标是基于系统的紧急特征，如生产：生物量或捕食者：猎物的比例。三个主要的战略确定为管理的基础上增加努力的鱼类组合的反应。
The fauna of inland waters, especially in the tropics, consist of complex assemblages of numerous species, which are not accessible to analysis by conventional stock assessment methods. The formulation of policies for management and conservation requires alternative models which are capable of predicting the ways in which such assemblages change in response to fishing or other stresses. Historically, models which group species according to simple parameters have proved adequate to provide the level of advice needed to indicate ecosystem health and sustainability of yield from the fishery. Such models have received relatively little attention, and can be profitably further developed and refined. The present review concludes that, out of the various explanatory variables, the mean length of fish caught is one of the most significant together with the numbers of species in the catch and the time taken for catches in fluctuating systems to respond to floods. More complex indicators are based on emergent characteristics of the system such as the production:biomass or predator:prey ratios. Three major strategies are identified for management based on responses of fish assemblages to increases in effort.