Roman Motyka, Olle Calles, Lovisa Lind, Johan Watz
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引用次数: 1
Abstract
Understanding how the physical habitat influences growth and behaviour is essential for developing effective habitat restoration programmes of threatened and endangered fish species. In our study, we compared the growth and behaviour of juvenile European eel during 13 weeks in aquaria with either sand (0.8–2 mm) or pebbles (25–40 mm) as bottom substrate. In aquaria with the pebble substrate, eel grew significantly faster than in aquaria with sand (specific growth rate 0.15 vs. 0.11% day−1). Moreover, growth rates varied more for individuals inhabiting aquaria with sand than in those with pebbles (coefficient of variation 1.26 vs. 0.67). Habitat-dependent growth rates may partly be explained by the observed differences in behavioural patterns. In aquaria with sand, eel left the substrate more often and moved close to the bottom or freely in water column. In aquaria with pebbles, eel remained hidden in the substrate to a high degree, also during feeding. These results may be important for prioritising connectivity- and habitat-restoring measures and for optimization of restocking programmes.
了解自然栖息地如何影响生长和行为,对于制定有效的受威胁和濒危鱼类栖息地恢复计划至关重要。在我们的研究中,我们比较了13周内以沙子(0.8-2毫米)或鹅卵石(25-40毫米)为底基质的水族箱中幼鳗的生长和行为。在卵石基质水族箱中,鳗鱼的生长速度明显快于砂基质水族箱(比生长率0.15 vs 0.11% day - 1)。此外,在有沙子的水族箱中个体的生长速率比在有鹅卵石的水族箱中个体的生长速率变化更大(变异系数1.26比0.67)。所观察到的行为模式差异可能部分解释了依赖栖息地的增长率。在有沙子的水族箱中,鳗鱼更多地离开基质,靠近底部或自由地在水柱中移动。在有鹅卵石的水族箱中,鳗鱼在进食过程中也高度隐藏在基质中。这些结果对于确定连通性和栖息地恢复措施的优先次序以及优化再放养计划可能很重要。
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.