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The dynamics of coexistence: habitat sharing versus segregation patterns among three sympatric montane vipers

Mebert, Konrad and Jagar, Tomaz and Grzelj, Rok and Cafuta, Vesna and Luiselli, Luca and Ostanek, Erika and Golay, Philippe and Dubey, Sylvain and Golay, Joaquim and Ursenbacher, Sylvain. (2015) The dynamics of coexistence: habitat sharing versus segregation patterns among three sympatric montane vipers. Biological journal of the Linnean Society, 116 (2). pp. 364-376.

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Official URL: http://edoc.unibas.ch/41515/

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Abstract

Contact zones of closely related and ecologically similar species constitute rare opportunities to study the evolutionary consequences of past speciation processes. They represent natural laboratories in which strong competition could lead to the exclusion of one species, or the various species may switch into distinct ecological niches. Alternatively, if reproductive isolation has not yet been achieved, they may hybridize. We elucidate the degree of taxon integrity by comparing genetics and habitat use of three similar-sized congeneric viper species, Vipera ammodytes, Vipera aspis, and Vipera berus, of Nadiza Valley in western Slovenia. No hybridization was detected for either mitochondrial or nuclear genomes. Similarly, external intermediacy by a single prestudy viper (probably V. ammodytes 9 V. aspis) indicates that hybridization occasionally occurs, but should be very rare. Populations of the three related viperids are partially allopatric in Nadiza Valley, but they also coexist in a narrow contact zone in the montane grassland along the south-exposed slope of Mount Stol (1673 m a.s.l.). Here, the three species that occupy areas in or near patches of rocky microhabitats (e.g. stone piles, slides, and walls) live in syntopy. However, fine-scale measurements of structural components show partial habitat segregation, in which V. berus becomes more dominant at elevations above 1400 m and occupies mostly the mountain ridge and north-exposed slopes of Mount Stol, V. aspis occurs below 1300 m and is the only species to inhabit stoneless patches of grass and bushes around 1000 m and lower, and V. ammodytes occurs at all elevations up to 1500 m, but is restricted to a rocky microhabitat. We suggest that a high degree of microstructure divergence, slightly different environmental niches, and a generally favourable habitat for all three viper species, keep the pressure for mis-mating and hybridization low, although mechanisms such as reduced hybrid inferiority and temporal mating segregation cannot yet be excluded.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Naturschutzbiologie (Baur)
UniBasel Contributors:Ursenbacher, Sylvain and Mebert, Konrad
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Academic Press
ISSN:0024-4066
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:30 Aug 2016 09:01
Deposited On:30 Aug 2016 09:01

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