Species differences, but not habitat, influence catch rate hyperstability across a recreational fishery landscape

Species differences, but not habitat, influence catch rate hyperstability across a recreational fishery landscape
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物种差异而非栖息地影响休闲渔业景观的捕获率超稳定性

DOI:
10.1016/j.fishres.2022.106438
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发表时间:
2022
期刊:
影响因子:
2.4
通讯作者:
Jones, Stuart E.
Jones, Stuart E.
中科院分区:
农林科学2区
文献类型:
--
作者:
Mosley, Camille L.;Dassow, Colin J.;Caffarelli, John;Ross, Alexander J.;G. Sass, Greg;Shaw, Stephanie L.;Solomon, Christopher T.;Jones, Stuart E.

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在商业和休闲渔业中,捕捞率通常被认为与种群规模成比例,并被管理人员和渔民用作渔业可持续性的指标。如果捕获率与种群规模成正比,它可能预示着种群的下降,管理人员可以实施限制性的捕捞政策,或者休闲垂钓者可以转移到一个新的系统,让过度开发的系统反弹。越来越多的文献记载,即使在鱼类种群减少的情况下,渔获量仍然很高(即,捕捞率的超稳定性),导致管理干预的延迟和过度捕捞。虽然最近的证据表明,在休闲渔业捕捞率的超稳定性的存在,超稳定性是否不同物种或系统类型仍然未知。为了调查捕捞率超稳定性是否在物种或系统之间变化,我们首先测试了电捕鱼单位努力量(efCPUE)是否是真实丰度的适当代理。然后,我们比较了垂钓者捕获率和鱼类丰度之间的关系,为常见的淡水运动鱼类在梯度的栖息地可用性。我们发现物种之间的超稳定性的强度显着差异。我们没有发现一个一致的影响栖息地的超稳定性的渔获量。垂钓者的偏好和行为可以解释一些非比例捕捞率的差异。未来的研究调查垂钓者的行为,人口规模结构,在这些系统中的人口动态可能会确定关键的相互作用,创造人口崩溃的脆弱性的差异。
In commercial and recreational fisheries, catch rate is often assumed to be proportional to stock size and is used by managers and fishers as an indicator of fishery sustainability. If catch rate is proportional to stock size, it can signal a decline of stocks and managers can impose restrictive harvest policies or recreational anglers can move to a new system and allow the over-exploited system to rebound. A growing literature has documented catch rates remaining high even as fish stocks decline (i.e., hyperstability of catch rates) leading to delayed management intervention and overexploitation. Although recent evidence has indicated the presence of hyperstability of catch rates in recreational fisheries, whether hyperstability differs across species or system types remains unknown. To investigate whether catch rate hyperstability varies amongst species or systems, we first tested whether electrofishing catch per unit effort (efCPUE) was an appropriate proxy for true abundance. We then compared the relationship between angler catch rate and fish abundance for common freshwater sport fishes across gradients of habitat availability. We found significant differences in the strength of hyperstability amongst species. We did not identify a consistent influence of habitat on hyperstability of catch rates. Angler preferences and behavior may explain some of the variance in non-proportional catch rates. Future research investigating angler behavior, population size structure, and population dynamics in these systems may identify key interactions that create differences in vulnerability to population collapse.
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