First occurrence of Lepomis gibbosus (L.,1758) in the Segura river basin (SE, Spain)

Oliva‐Paterna, Francisco J.; Andreu, Asunción; Verdiell, D.; Torralva, Mar

doi:10.23818/limn.24.19

Cited by 10 publications

References 39 publications

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Eurasian otter Lutra lutra diet mirrors the decline of native fish assemblages in a semi-arid catchment (River Segura, SE Spain)

et al. 2022

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In semi-arid environments, the effects of irregularly distributed rainfall, flow regulation and water inter-basin transfer enhance the spread of non-native fish to the detriment of native communities. In the River Segura, since the 1980s the number of non-native fish species has progressively increased, also because of the building of water transfer facility connecting the rivers Segura and Tajo. With the aim of highlighting how man-driven changes in the diversity of fish communities affect the diet of top-predators, we compared Eurasian otter Lutra lutra diet in the span of 20 years, i.e. 1997–98 vs. 2016–19. As habitat quality affects the condition of Andalusian barbel Luciobarbus sclateri, the most widespread native fish, we also compared the size of preyed barbels to point out whether human activities may have lowered their profitability to otters. Fish and introduced red swamp crayfish Procambarus clarkii formed the bulk of otter diet in both study periods. In 2016–19 the contribution of non-native species to otter diet increased significantly, both for crayfish and fish, which included ten non-native species. Otter feeding habits faithfully mirrored the variation in the composition of the fish community and confirmed the importance of crayfish as alternative-to-fish prey in the Iberian Peninsula. The average length of preyed barbels was significantly lower in the second study period, consistently with a decline in barbel profitability for otters.

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Eurasian otter Lutra lutra diet mirrors the decline of native fish assemblages in a semi-arid catchment (River Segura, SE Spain)

et al. 2022

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Distribution and diet of recovering Eurasian otter (Lutra lutra) along the natural-to-urban habitat gradient (river Segura, SE Spain)

et al. 2021

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In the catchment of the River Segura (SE Spain), ongoing Eurasian otter (Lutra lutra) recovery and concurrent spread of human settlements are resulting in increasing otter records into urban areas. We analysed otter diet along a natural-to-urban gradient, with the main aim of assessing to which extent man-driven variation in food availability affects its feeding habits and how this secretive mustelid can thrive in apparently unsuitable habitats. From 2016 to 2019, we collected 521 spraints, monitoring 37 sampling stations (mean length ± SD = 0.5 ± 0.3 km). In natural areas, the percent cover of undisturbed banks was the highest, with the lowest number of water abstraction systems, whilst water pollution was the highest in urban areas. Introduced red swamp crayfish (Procambarus clarkii) and fish formed the bulk of otter diet. The two most preyed fish, Luciobarbus sclateri and Pseudochondrostoma polylepis, were among the most abundant species in the river, confirming the generalist feeding behaviour of the otter. The contribution of nonnative fish was on average low, while invasive crayfish exceeded the overall importance of fish in all habitats except urban areas. Overall, diet data did not allow attesting food as a limiting resource for otters in urban areas. In contrast, marking intensity varied consistently with the natural-to-urban gradient (from 0.31 to 0.65 spraints/100 m in urban-and natural areas, respectively), suggesting that human disturbance (i.e. habitat modification and water pollution) may play a major role in shaping otter distribution.

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Lepomis gibbosus (pumpkinseed)

Copp¹

2010

CABI Compendium

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First occurrence of Lepomis gibbosus (L.,1758) in the Segura river basin (SE, Spain)

Cited by 10 publications

References 39 publications

Eurasian otter Lutra lutra diet mirrors the decline of native fish assemblages in a semi-arid catchment (River Segura, SE Spain)

Eurasian otter Lutra lutra diet mirrors the decline of native fish assemblages in a semi-arid catchment (River Segura, SE Spain)

Distribution and diet of recovering Eurasian otter (Lutra lutra) along the natural-to-urban habitat gradient (river Segura, SE Spain)

Lepomis gibbosus (pumpkinseed)

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