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Long-term effects of colonization-extinction dynamics of generalist versus specialist wood-decaying fungi

Moor, Helen and Norden, Jenni and Penttila, Reijo and Siitonen, Juha and Snäll, Tord (2021). Long-term effects of colonization-extinction dynamics of generalist versus specialist wood-decaying fungi. Journal of Ecology. 109 , 491-503
[Research article]

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Abstract

Long-term metapopulation persistence is mediated by the dynamics of colonization and extinction. To understand and predict future species occupancy in changing landscapes, we must account for the dynamic rates that shape the occupancy and disentangle their dependence on environmental conditions. Specialist and generalist species may differ in their dynamics in systematic ways.Using an extensive, large-scale repeat survey dataset for wood-decaying fungi, we fitted dynamic metapopulation models for ten species, ranging from generalists to specialists with differing resource requirements. We first estimated base rates of colonization and extinction and tested their relationships to species' degree of specialization. We then tested for effects of local and landscape scale variables on the colonization and extinction rates. Finally, using the fitted models and a scenario of future forest development we projected future colonization-extinction dynamics over 100 years to test for differences in species occupancies between production stands and set-aside stands.Our study revealed a striking pattern of decreasing colonization rates with increasing degree of specialization across species, along with concomitantly increasing extinction rates. Strong sensitivity of colonization probabilities to local habitat quality (dead wood volume and stand age) in specialist but not generalist species constrained the regional occupancy of specialists, especially in production forest. We found evidence for short-range dispersal limitation in two specialists, but no effect of our measure for landscape-scale connectivity on colonization rates. Simulations of future metapopulation dynamics resulted in decreasing and lower final occupancy in production forest than in set-asides, especially of specialist species. In set-aside stands, however, specialists increased over time to relatively high occupancies.Synthesis. Colonization-extinction dynamics of wood-decaying fungi varied with species' degree of specialization. Increasing specialization was associated with increasing sensitivity of colonization rates to habitat conditions, and partly local connectivity, as well as with increasing extinction rates. Low landscape-scale occupancies of specialist as compared to generalist wood-decaying fungi are thus maintained by a combination of lower colonization rates, particularly in production forest, and higher extinction rates.

Authors/Creators:Moor, Helen and Norden, Jenni and Penttila, Reijo and Siitonen, Juha and Snäll, Tord
Title:Long-term effects of colonization-extinction dynamics of generalist versus specialist wood-decaying fungi
Series Name/Journal:Journal of Ecology
Year of publishing :2021
Volume:109
Page range:491-503
Number of Pages:13
Publisher:WILEY
ISSN:0022-0477
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:colonization–extinction dynamics, decomposer fungi, dynamic occupancy model, ecological specialization, forestry, landscape ecology, land‐use scenario, metapopulation
URN:NBN:urn:nbn:se:slu:epsilon-p-108698
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108698
Additional ID:
Type of IDID
DOI10.1111/1365-2745.13526
Web of Science (WoS)000583054400001
ID Code:25513
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Swedish Species Information Centre
Deposited By: SLUpub Connector
Deposited On:27 Sep 2021 12:25
Metadata Last Modified:27 Sep 2021 12:31

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