Spore sensitivity to sunlight and freezing can restrict dispersal in wood-decay fungi

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http://hdl.handle.net/10138/162265

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Norros , V M , Karhu , E , Nordén , J , Vähätalo , A V & Ovaskainen , O T 2015 , ' Spore sensitivity to sunlight and freezing can restrict dispersal in wood-decay fungi ' , Ecology and Evolution , vol. 5 , no. 16 , pp. 3312-3326 . https://doi.org/10.1002/ece3.1589

Title: Spore sensitivity to sunlight and freezing can restrict dispersal in wood-decay fungi
Author: Norros, Veera Maria; Karhu, Elina; Nordén, Jenni; Vähätalo, Anssi Vesa; Ovaskainen, Otso Tapio
Contributor: University of Helsinki, Biosciences
University of Helsinki, Environmental Sciences
University of Helsinki, Biosciences
Date: 2015
Language: eng
Number of pages: 15
Belongs to series: Ecology and Evolution
ISSN: 2045-7758
URI: http://hdl.handle.net/10138/162265
Abstract: Assessment of the costs and benefits of dispersal is central to understanding species' life-history strategies as well as explaining and predicting spatial population dynamics in the changing world. While mortality during active movement has received much attention, few have studied the costs of passive movement such as the airborne transport of fungal spores. Here, we examine the potential of extreme environmental conditions to cause dispersal mortality in wood-decay fungi. These fungi play a key role as decomposers and habitat creators in forest ecosystems and the populations of many species have declined due to habitat loss and fragmentation. We measured the effect of simulated solar radiation (including ultraviolet A and B) and freezing at -25 degrees C on the spore germinability of 17 species. Both treatments but especially sunlight markedly reduced spore germinability in most species, and species with thin-walled spores were particularly light sensitive. Extrapolating the species' laboratory responses to natural irradiance conditions, we predict that sunlight is a relevant source of dispersal mortality at least at larger spatial scales. In addition, we found a positive effect of spore size on spore germinability, suggesting a trade-off between dispersal distance and establishment. We conclude that freezing and particularly sunlight can be important sources of dispersal mortality in wood-decay fungi which can make it difficult for some species to colonize isolated habitat patches and habitat edges.
Subject: 1181 Ecology, evolutionary biology
Basidiomycetes
connectivity
germination
habitat fragmentation
life-history evolution
long-distance dispersal
mortality
movement
spore viability
stress tolerance
ultraviolet radiation
SOLAR-RADIATION
AERIAL DISPERSAL
OZONE DEPLETION
self-inhibitor
BOREAL FORESTS
GERMINATION
ABUNDANCE
SURVIVAL
FRAGMENTATION
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