Long-term monitoring of pikeperch (Sander lucioperca) populations under increasing temperatures and predator abundances in the Finnish coastal waters of the Baltic Sea

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-04-23 DOI:10.1111/eff.12721
Mikko Olin, Outi Heikinheimo, Topi K. Lehtonen, Jari Raitaniemi
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引用次数: 1

Abstract

The Baltic Sea has been under intense environmental changes in the recent decades, such as climate change, eutrophication and increasing abundance of top-predators, which pose serious challenges to its aquatic life. For informed conservation measures and sustainable yields, we need to understand how the populations are being affected. Accordingly, we used long-term data series (covering the period between 1980 and 2021) to assess how these changes have affected populations of an ecologically and economically important predatory fish, the pikeperch (Sander lucioperca), in the coastal waters of Finland in the northern Baltic Sea. We investigated the estimates of abundance and recruitment, commercial and recreational catch statistics and growth and mortality rates. We found a clear increase in the total catches in the northernmost part of the Finnish coast (Bothnian Bay) that were not explained by changes in fishing effort, indicating increased abundance, most likely due to higher water temperature. In the southern part of the study area (Archipelago Sea), density-dependent factors prevented the development of particularly strong year classes, despite the beneficial conditions of warming seawater and consecutive warm summers. Individual growth has increased in younger age groups, contributing to an upward trend in the spawning population biomass. We also uncovered a declining trend in the total mortality in the southern area, despite increased abundances of cormorants and seals, explained by reduced total fishing mortality. These results show that the pikeperch is one of the species that has, thus far, benefited from the environmental change in the northern Baltic Sea, strengthening its role in the ecosystem.

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波罗的海芬兰沿海水域在不断增加的温度和捕食者丰度下对pikepers(Sander lucioperca)种群的长期监测
近几十年来,波罗的海经历了剧烈的环境变化,如气候变化、富营养化和顶级捕食者数量的增加,对其水生生物构成了严重挑战。为了明智的保护措施和可持续的产量,我们需要了解种群是如何受到影响的。因此,我们使用长期数据系列(涵盖1980年至2021年期间)来评估这些变化如何影响波罗的海北部芬兰沿海水域的一种生态和经济上重要的掠食性鱼类——刺鲈(Sander lucioperca)的种群。我们调查了丰度和招募、商业和娱乐捕捞统计以及生长和死亡率的估计。我们发现芬兰海岸最北端的总捕鱼量明显增加,这不能用捕鱼努力的变化来解释,这表明丰度增加,很可能是由于水温升高。在研究区域的南部(群岛海),尽管海水变暖和连续温暖的夏季是有利的条件,但密度依赖因素阻止了特别强的年类的发展。在较年轻的年龄组中,个体生长有所增加,导致产卵种群生物量呈上升趋势。我们还发现,尽管南部地区的鸬鹚和海豹数量增加,但总死亡率呈下降趋势,这可以解释为捕捞总死亡率降低。这些结果表明,到目前为止,猪鲈是受益于波罗的海北部环境变化的物种之一,加强了它在生态系统中的作用。
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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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