Temporal biodiversity change following disturbance varies along an environmental gradient

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http://hdl.handle.net/10138/330987

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Kaarlejarvi , E , Salemaa , M , Tonteri , T , Merila , P & Laine , A-L 2021 , ' Temporal biodiversity change following disturbance varies along an environmental gradient ' , Global Ecology and Biogeography , vol. 30 , no. 2 , pp. 476-489 . https://doi.org/10.1111/geb.13233

Title: Temporal biodiversity change following disturbance varies along an environmental gradient
Author: Kaarlejarvi, Elina; Salemaa, Maija; Tonteri, Tiina; Merila, Paivi; Laine, Anna-Liisa
Contributor: University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Research Centre for Ecological Change
Date: 2021-02
Language: eng
Number of pages: 14
Belongs to series: Global Ecology and Biogeography
ISSN: 1466-822X
URI: http://hdl.handle.net/10138/330987
Abstract: Aim The diversity and composition of natural communities are rapidly changing due to anthropogenic disturbances. Magnitude of this compositional reorganization varies across the globe, but reasons behind the variation remain largely unknown. Disturbances induce temporal turnover by stimulating species colonizations, causing local extinctions, altering dominance structure, or all of these. We test which of these processes drive temporal community changes, and whether they are constrained by natural environmental gradients. Moreover, we assess to what degree identity shifts translate to changes in dominance structure. Location Finland. Time period Observations 1985-2006, disturbance history > 140 years. Major taxa studied Vascular plants. Methods We investigated temporal turnover of boreal forest understorey in response to disturbance, here forest management, along a soil fertility gradient. We disentangle the roles of species gains, losses and abundance changes in driving temporal turnover in response to and after disturbance by comparing turnover rates in different forest age categories along a fertility gradient. We quantify temporal turnover using richness-based complement of Jaccard's similarity index and proportional-abundance based dissimilarity index. We also test whether disturbance history or fertility influence the relationship between identity shifts and dominance structure. Results We found that the impact of disturbance on temporal turnover depends on soil fertility. The greatest turnover occurred in the most fertile forests immediately after disturbance. There, species gains and losses strongly altered dominance structure leading to high turnover, whereas undisturbed old forests and nutrient-poor habitats were characterized by stable dominant species even when the majority of species shifted their identity. Main conclusions Our results suggest that human impacts on temporal biodiversity change vary along environmental gradients. In boreal forests, the fertile habitats have a higher probability than nutrient-poor sites of changing their composition in response to anthropogenic disturbances. Resource availability and disturbance history may thus influence consequences of temporal turnover for ecosystem functioning.
Subject: beta diversity
clear&#8208
cut
forestry
gains
losses
nitrogen
nutrient
richness
succession
temporal turnover
SPECIES RICHNESS
UNDERSTORY VEGETATION
FOREST MANAGEMENT
BETA DIVERSITY
BOREAL
SUCCESSION
TURNOVER
DYNAMICS
CONSEQUENCES
PRODUCTIVITY
1181 Ecology, evolutionary biology
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