Predator–prey dynamics mediate long-term production trends of cisco (Coregonus artedi) in a northern Wisconsin lake
Predator–prey dynamics mediate long-term production trends of cisco (Coregonus artedi) in a northern Wisconsin lake
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捕食者-猎物动态调节威斯康星州北部湖泊中思科（Coregonus artedi）的长期生产趋势
DOI：
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发表时间：
2018
影响因子：
2.4
通讯作者：
A. Rypel
中科院分区：
文献类型：
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作者：
Timothy P. Parks;A. Rypel
我们量化了美国威斯康星州Trout Lake的思科(Coregonus Artedi)的产量、生物量和产量与生物量的比率(P/B)(2001-2015)。年生产量、生物量和P/B的变化范围分别为0.6~30.2 kg·ha−1·a−1、1.2~39.7 kg·ha−1和0.4~0.9·a−1。思科产量出现了明显的下降。然而，生物量和P/B都没有随着时间的推移发生显著变化。环境条件的长期模式在研究期间保持不变，与思科生产无关。然而，湖泊鲑鱼(Salvelinus Namaycush)的相对丰度与思科产量和生物量呈显著负相关。随着时间的推移，这个湖里发生了大量的湖泊鲑鱼放养，以保护该物种的一种独特的遗传品系。这些管理努力可能产生了意想不到的后果，放大了对思科的自上而下的掠夺。由于思科盈亏平衡在很大程度上没有变化，预计思科产量将迅速反弹，以适应湖鲑鱼库存的减少。湖泊鲑鱼数量的进一步增加可能会使这两个种群面临崩溃的风险。这项研究为了解和养护冷水渔业，特别是在以Ciscoes为主的湖泊中的冷水渔业提供了一个渔业生产方法的例子。
We quantified production, biomass, and production to biomass (P/B) ratios for cisco (Coregonus artedi) in Trout Lake, Wisconsin, USA (2001–2015). Across all years, annual production, biomass, and P/B were variable ranging 0.6–30.2 kg·ha−1·year−1, 1.2–39.7 kg·ha−1, and 0.4–0.9·year−1, respectively. Cisco production exhibited obvious decline. However, neither biomass nor P/B changed significantly over time. Long-term patterns of environmental conditions remained unchanged during the study and were unrelated to cisco production. However, lake trout (Salvelinus namaycush) relative abundance showed a strong inverse relationship with cisco production and biomass. Intense lake trout stocking has occurred in this lake over time to conserve a genetically unique strain of the species. These management efforts may have had the unintended consequence of amplifying top-down predation on cisco. Since cisco P/B has gone largely unchanged, cisco production would be predicted to rebound quickly to adaptive reductions in lake trout stocking. Further increases in lake trout numbers could place both populations at risk of collapse. This study provides an example of a fisheries production approach for understanding and conserving cold-water fisheries, especially in lakes dominated by ciscoes.