Are perch (Perca fluviatilis L.) getting larger or smaller in Swedish lakes?

IF 1.6 3区 农林科学 Q3 FISHERIES Ecology of Freshwater Fish Pub Date : 2023-03-30 DOI:10.1111/eff.12719
Holmgren Kerstin, Erik Petersson
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引用次数: 1

Abstract

Space- for-time approaches are often used to indicate current or future changes over time. A European gillnet standard facilitates spatial-scale comparisons of fish communities in European lakes. Fish size was generally lower and densities higher in warmer lakes, but less is known about trends over decadal time scales. We analysed the size of European perch ( Perca fluviatilis L.) in 2121 Swedish lakes sampled during 1996– 2021. The aim was to test whether size changed over time, and whether trends were similar in southern and northern regions. We analysed mean length and occurrence or relative abundance of size classes from the smallest ( < 100 mm) to the largest individuals (≥350 mm), and length at 1 and 5 years. The large data set was used to find general trends over time within regions, and within-lake trends were tested for 40 time-series lakes. The mean length of perch decreased in the southern and increased in the northern region. The proportion of the smallest perch increased

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在瑞典的湖泊里,鲈鱼(pera fluviatilis L.)变大了还是变小了?
空间换时间的方法通常用于表示当前或未来随时间的变化。欧洲刺网标准促进了欧洲湖泊鱼类群落的空间尺度比较。在温暖的湖泊中,鱼的大小通常更小,密度更高,但对十年时间尺度的趋势知之甚少。我们分析了1996-2021年期间瑞典2121个湖泊中欧洲鲈鱼(pera fluviatilis L.)的大小。目的是测试大小是否随时间而变化,以及南部和北部地区的趋势是否相似。我们分析了从最小个体(<100 mm)到最大个体(≥350 mm)的平均长度和大小类别的发生率或相对丰度,以及1年和5年的长度。大数据集用于寻找区域内随时间变化的总体趋势,并对40个时间序列湖泊的湖内趋势进行了测试。鲈鱼的平均长度南部减少,北部增加。最小鲈鱼的比例在南部增加,但在北部没有增加。最普遍的趋势是,在大型数据集中,这两个地区最大的鲈鱼的发生率和比例都在增加。大数据集南部地区的平均趋势在时间序列湖泊中也表现为主导趋势,尽管在每个区域的一些湖泊中出现相反的趋势。这项研究还显示,1岁时的鲈鱼大小往往随着时间的推移而增加,而5岁时的大小变化趋势更大。在本研究的时间范围内,生长季节的持续时间普遍增加,而同一区域的湖泊之间的其他变化可能有所不同。我们建议开展更多基于鱼类监测时间序列的研究,包括对瑞典湖泊中超大型鲈鱼数量增加的可能原因的研究。
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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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