Functional traits of indigenous and exotic ground-dwelling arthropods show contrasting responses to land-use change in an oceanic island, Terceira, Azores

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Rigal , F , Cardoso , P , Lobo , J M , Triantis , K A , Whittaker , R J , Amorim , I R & Borges , P A V 2018 , ' Functional traits of indigenous and exotic ground-dwelling arthropods show contrasting responses to land-use change in an oceanic island, Terceira, Azores ' , Diversity and Distributions , vol. 24 , no. 1 , pp. 36-47 . https://doi.org/10.1111/ddi.12655

Title: Functional traits of indigenous and exotic ground-dwelling arthropods show contrasting responses to land-use change in an oceanic island, Terceira, Azores
Author: Rigal, Francois; Cardoso, Pedro; Lobo, Jorge M.; Triantis, Kostas A.; Whittaker, Robert J.; Amorim, Isabel R.; Borges, Paulo A. V.
Contributor: University of Helsinki, Finnish Museum of Natural History
Date: 2018-01
Language: eng
Number of pages: 12
Belongs to series: Diversity and Distributions
ISSN: 1366-9516
URI: http://hdl.handle.net/10138/238078
Abstract: Aim: Land-use change typically goes hand in hand with the introduction of exotic-species, which mingle with indigenous species to form novel assemblages. Here, we compare the functional structure of indigenous and exotic elements of ground-dwelling arthropod assemblages across four land-uses of varying management intensity. Location: Terceira Island (Azores, North Atlantic). Methods: We used pitfall traps to sample arthropods in 36 sites across the four land-uses and collated traits related to dispersal ability, body size and resource use. For both indigenous and exotic species, we examined the impact of land-uses on trait diversity and tested for the existence of non-random assembly processes using null models. We analysed differences in trait composition among land-uses for both indigenous and exotic species with multivariate analyses. We used point-biserial correlations to identity traits significantly correlated with specific land-uses for each element. Results: We recorded 86 indigenous and 116 exotic arthropod species. Under high-intensity land-use, both indigenous and exotic elements showed significant trait clustering. Trait composition strongly shifted across land-uses, with indigenous and exotic species being functionally dissimilar in all land-uses. Large-bodied herbivores dominated exotic elements in low-intensity land-uses, while small-bodied spiders dominated exotic elements in high-intensity land-uses. In contrast, with increasing land-use intensity, indigenous species changed from functionally diverse to being dominated by piercing and cutting herbivores. Main conclusions: Our study revealed two main findings: first, in high-intensity - land-uses, trait clustering characterized both indigenous and exotic elements; second, exotic species differed in their functional profile from indigenous species in all land-use types. Overall, our results provide new insights into the functional role of exotic species in a land-use context, suggesting that, in agricultural landscape, exotic species may contribute positively to the maintenance of some ecosystem functions.
Subject: 1172 Environmental sciences
arthropods
Azores
community assembly
exotic species
functional diversity
indigenous species
USE INTENSIFICATION
AGRICULTURAL LANDSCAPES
MACARONESIAN SPIDERS
COMMUNITY ECOLOGY
DIVERSITY
BIODIVERSITY
MANAGEMENT
RICHNESS
HABITAT
PREDATORS
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