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Characterization of habitat requirements of European fishing spiders

Lisa Dickel, View ORCID ProfileJérémy Monsimet, Denis Lafage, Olivier Devineau
doi: https://doi.org/10.1101/2020.12.13.422580
Lisa Dickel
1Department of Forestry and Wildlife management, Inland Norway University of Applied Sciences, Campus Evenstad, Koppang, Norway
2Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Sciences and Technology (NTNU)
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  • For correspondence: jeremy.monsimet@inn.no
Jérémy Monsimet
1Department of Forestry and Wildlife management, Inland Norway University of Applied Sciences, Campus Evenstad, Koppang, Norway
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  • For correspondence: jeremy.monsimet@inn.no
Denis Lafage
3UMR CNRS 6553 ECOBIO, Université de Rennes, Rennes, France
4Department of Environmental and Life Sciences/Biology, Karlstad University, Karlstad, Sweden
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Olivier Devineau
1Department of Forestry and Wildlife management, Inland Norway University of Applied Sciences, Campus Evenstad, Koppang, Norway
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Abstract

Wetlands are among the most threatened habitats in the world, and so are their species, which suffer habitat loss due to climate and land use changes. Freshwater species and arthropods receive little attention in research and conservation, and the goals to stop and reverse the destruction of wetlands published 25 years ago in a manifesto by the Union of Concerned Scientists have not been reached. In this study, we investigated the occurrence and habitat requirements at two spatial scales of two species of European fishing spiders Dolomedes, which rely heavily on declining wetland habitats in Sweden and southern Norway.

We collected occurrence data for Dolomedes plantarius and Dolomedes fimbriatus, using a live-determination-method. We modelled the placement of nursery webs to describe fine scaled habitat requirements related to vegetation and microclimate. Using a machine learning approach, we described the habitat features for each species, and for co-occurrence sites, to provide insight into variables relevant for the detectability of Dolomedes.

We found that habitat requirements were narrower for D. plantarius compared to D. fimbriatus; that the detection of nursery webs can be affected by weather conditions and that nursery placement is mostly dependent on the proximity to water, the presence of Carex sp. (Sedges) and of crossing vegetation structures, and on humidity. Furthermore, co-occurring sites were more similar to D. plantarius sites than to D. fimbriatus sites, whereby surrounding forest, water type and velocity, elevation and latitude were of importance for explaining which species of Dolomedes was present.

We provide a detailed field protocol for Dolomedes studies, including a novel live-determination method, and recommendations for future field protocols.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 13, 2020.
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Characterization of habitat requirements of European fishing spiders
Lisa Dickel, Jérémy Monsimet, Denis Lafage, Olivier Devineau
bioRxiv 2020.12.13.422580; doi: https://doi.org/10.1101/2020.12.13.422580
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Characterization of habitat requirements of European fishing spiders
Lisa Dickel, Jérémy Monsimet, Denis Lafage, Olivier Devineau
bioRxiv 2020.12.13.422580; doi: https://doi.org/10.1101/2020.12.13.422580

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