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Article

Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range

by
Kristofer Bergström
*,
Hanna Berggren
,
Oscar Nordahl
,
Per Koch-Schmidt
,
Petter Tibblin
and
Per Larsson
Ecology and Evolution in Microbial Model Systems, EEMiS, Department of Biology and Environmental Science, Linnaeus University, SE-391 82 Kalmar, Sweden
*
Author to whom correspondence should be addressed.
Fishes 2024, 9(7), 280; https://doi.org/10.3390/fishes9070280
Submission received: 11 June 2024 / Revised: 5 July 2024 / Accepted: 10 July 2024 / Published: 14 July 2024
(This article belongs to the Special Issue Biomonitoring and Conservation of Freshwater & Marine Fishes)
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Abstract

Fish behavior often varies across a species’ distribution range. Documenting how behaviors vary at fringes in comparison to core habitats is key to understanding the impact of environmental variation and the evolution of local adaptations. Here, we studied the behavior of Wels catfish (Silurus glanis) in Lake Möckeln, Sweden, which represent a European northern fringe population. Adult individuals (101–195 cm, N = 55) were caught and externally marked with data storage tags (DSTs). Fifteen DSTs were recovered a year after tagging, of which 11 tags contained long-term high-resolution behavioral data on the use of vertical (depth) and thermal habitats. This showed that the catfish already became active in late winter (<5 °C) and displayed nocturnal activity primarily during summer and late autumn. The latter included a transition from the bottom to the surface layer at dusk, continuous and high activity close to the surface during the night, and then descent back to deeper water at dawn. During the daytime, the catfish were mainly inactive in the bottom layer. These behaviors contrast with what is documented in conspecifics from the core distribution area, perhaps reflecting adaptive strategies to cope with lower temperatures and shorter summers.
Keywords: peripheral population; Siluriformes; behavior; data storage tags; biologgers; apex predator; freshwater peripheral population; Siluriformes; behavior; data storage tags; biologgers; apex predator; freshwater

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MDPI and ACS Style

Bergström, K.; Berggren, H.; Nordahl, O.; Koch-Schmidt, P.; Tibblin, P.; Larsson, P. Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range. Fishes 2024, 9, 280. https://doi.org/10.3390/fishes9070280

AMA Style

Bergström K, Berggren H, Nordahl O, Koch-Schmidt P, Tibblin P, Larsson P. Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range. Fishes. 2024; 9(7):280. https://doi.org/10.3390/fishes9070280

Chicago/Turabian Style

Bergström, Kristofer, Hanna Berggren, Oscar Nordahl, Per Koch-Schmidt, Petter Tibblin, and Per Larsson. 2024. "Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range" Fishes 9, no. 7: 280. https://doi.org/10.3390/fishes9070280

APA Style

Bergström, K., Berggren, H., Nordahl, O., Koch-Schmidt, P., Tibblin, P., & Larsson, P. (2024). Seasonal and Daily Movement Patterns by Wels Catfish (Silurus glanis) at the Northern Fringe of Its Distribution Range. Fishes, 9(7), 280. https://doi.org/10.3390/fishes9070280

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