Biotic homogenisation in bird communities leads to large-scale changes in species associations

Rigal, Stanislas; Devictor,; Gaüzère, Pierre; Kéfi, Sonia; Jt, Forsman; Mh, Kajanus; Mönkkönen, Mikko; Dakos,

doi:10.1101/2020.11.13.380956

Cited by 6 publications

(10 citation statements)

References 132 publications

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“…Negative effects of pure conifer stands became even more obvious when moving from the plot level to the landscape scale and considering species turnover and gamma diversity. Lower gamma diversity of common bird species and correspondingly lower species turnover among sites in pure conifer stands mean that biotic homogenization is an important concern for larger scale forest management (see also Magura et al, 2008; Rigal et al, 2022). Our results suggest that local mixtures of beech with conifers might also be beneficial for bird diversity at the landscape scale, possibly because the potential structural and resource deficiencies of pure conifer stands discussed above are amplified at larger spatial scales.…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, our general understanding of stand diversification effects on biodiversity is hampered by a lack of data on biodiversity facets beyond species richness. Human alterations do not necessarily result in reduced species richness at local scales, but can nevertheless lead to marked changes in functional composition and to biotic homogenization through the loss of specialized species (Matthews et al, 2014; Rigal et al, 2022). Such effects are also expected to occur when tree species are planted outside their natural range, because especially generalist species might adapt to the novel resources these tree species provide (Gossner & Utschick, 2004; Pedley et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Tree mixtures mediate negative effects of introduced tree species on bird taxonomic and functional diversity

Schuldt

Huke

Glatthorn

et al. 2022

Journal of Applied Ecology

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1. Recent biodiversity loss has emphasized the necessity to critically evaluate the consequences of human alterations of forest ecosystems. Stand diversification via tree species mixtures and the use of non-native trees are two such alterations currently gaining importance as climate change adaptations. However, the effects of local versus regional tree mixing on associated biodiversity and notably the modifying role of tree species growing outside their natural range remain poorly understood.2. We assessed how monocultures and mixtures of native and introduced tree species influence the taxonomic and functional diversity of bird communities at stand and landscape scales in north-west Germany. We focused on the dominant natural tree species (Fagus sylvatica) and economically important conifer species planted outside their natural range (the native Picea abies and non-native Pseudotsuga menziesii).3. We found that bird species richness and functional diversity were generally higher in pure and mixed stands of native F. sylvatica than in pure conifer stands, especially in comparison to non-native P. menziesii. These differences were particularly strong at the landscape scale. Pure conifer stands harboured only a reduced set of functionally similar bird species. Structural diversity based on tree microhabitat availability emerged as a key predictor of bird diversity. Synthesis and applications.Our study suggests that tree species mixtures do not necessarily increase bird diversity compared to pure stands of native trees, but can promote bird diversity relative to pure stands of species planted outside their natural range. Moreover, local mixtures, rather than a mosaic of pure stands, may promote bird diversity also at the landscape scale. By contrast, pure stands of tree species planted outside their natural range can increase biotic homogenization of forest birds. Promoting structural diversity of microhabitats via tree retention and ensuring that non-native trees are planted in mixtures

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tree mixtures mediate negative effects of introduced tree species on bird taxonomic and functional diversity

Schuldt

Huke

Glatthorn

et al. 2022

Journal of Applied Ecology

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“…All the analyses were done with the R software (ver. 3.4.4, <http://www.r-project.org>) and the R scripts and data are available on Dryad (Rigal et al 2021).…”

Section: Methodsmentioning

confidence: 99%

“…Data are available from the Dryad Digital Repository: <https:// doi.org/10.5061/dryad.c2fqz616h> (Rigal et al 2021).…”

Section: Author Contributionsmentioning

confidence: 99%

Biotic homogenisation in bird communities leads to large‐scale changes in species associations

Rigal

Devictor

Gaüzère

et al. 2021

Oikos

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The impact of global change on biodiversity is commonly assessed in terms of changes in species distributions, community richness and community composition. Whether and how much associations between species are also changing is much less documented. In this study, we quantify changes in large-scale patterns of species associations in bird communities in relation to changes in species composition. We use network approaches to build three community-aggregated indices reflecting complementary aspects of species association networks. We characterise the spatio-temporal dynamics of these indices using a large-scale and high-resolution dataset of bird co-abundances of 109 species monitored for 17 years (2001-2017) from 1969 sites across France. We finally test whether spatial and temporal changes in species association networks are related to species homogenisation estimated as the spatio-temporal dynamics of species turnover (β-diversity) and community generalism (community generalisation index). The consistency of these relationships is tested across three main habitats, namely woodland, grassland and human settlements. We document a directional change in association-based indices in response to modifications in species turnover and community generalism in space and time. Weaker associations and sparser networks were related to lower spatial species turnover and higher community generalism, suggesting an overlooked aspect of biotic homogenisation affecting species associations and may also have an impact on species interactions. We report that this overall pattern is not constant across habitats, with opposite relationships between biotic homogenisation and change in species association networks in urban versus forest communities suggesting distinct homogenisation processes. Although species associations contain only partial signatures of species interactions, our study highlights that biotic homogenisation translates to finer changes in community structure by affecting the number, strength and type of species associations.

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“…competition and predation). The co‐occurrence of different species in a community thus reflects that their life‐history and ecological traits allow them to persist in the environment and, more importantly, that niche diversification and differences in resource exploitation exist among taxa (MacArthur and Leven 1967, Rigal et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Altitudinal dispersal process drives community assembly of montane small mammals

Wen

Feijó

et al. 2022

Ecography

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Montane small mammals are subjected to strong forces of dispersal limitation and habitat filtering that mainly operate on their community structures along the altitudinal direction. However, so far little is known about the relative contributions of dispersal and niche processes to their community assembly. By applying the newly proposed PER-SIMPER/DNCI (dispersal-niche continuum index) framework to small mammal occurrence data collected from 21 extensive altitudinal gradients, we quantitatively assessed the relative importance of dispersal and niche processes on mammalian community assembly in a large mountainous region of southwestern China. We compared the pairwise DNCI values among assemblages from low, middle and high altitudinal zones and overall DNCI values between glires and insectivores that differ in dispersal abilities to test three explicit (altitudinal connectivity, environmental difference and dispersal ability) hypotheses. The overall DNCI values for all small mammal species combined (−12.7 ± 0.4, 90 species), glires (−12.8 ± 0.5, 56 species) and insectivores (−13.5 ± 1.4, 34 species) values were all negative, while insectivores showed a lower value than glires. For both all species combined and glires, we found a lower pairwise DNCI value between the low and high altitudinal zones than that between the other two pairs of altitudinal zones. Our study indicated that an altitudinal dispersal process dominates the taxonomic composition of small mammal assemblages in this region. Importantly, the results reinforced the idea that community structures of less vagile taxa are more subject to dispersal limitation; and yet another idea that assemblages from further altitudinal areas are more differentiated by dispersal process was only supported in glires and all species combined. Community biologists should, therefore, pay attention to recent climate-induced upward range shifts by montane species, which may dramatically alter their community structures in different altitudinal zones through dynamics of immigration and mountaintop extinction.

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Biotic homogenisation in bird communities leads to large-scale changes in species associations

Cited by 6 publications

References 132 publications

Tree mixtures mediate negative effects of introduced tree species on bird taxonomic and functional diversity

Tree mixtures mediate negative effects of introduced tree species on bird taxonomic and functional diversity

Biotic homogenisation in bird communities leads to large‐scale changes in species associations

Altitudinal dispersal process drives community assembly of montane small mammals

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