Climatic aridity increases temporal nestedness of invertebrate communities in naturally drying rivers

Vander Vorste, R., Stubbington, R. ORCID: 0000-0001-8475-5109, Acuña, V., Bogan, M.T., Bonada, N., Cid, N., Datry, T., Storey, R., Wood, P.J. and Ruhi, A., 2021. Climatic aridity increases temporal nestedness of invertebrate communities in naturally drying rivers. Ecography. ISSN 0906-7590

[img]
Preview
Text
1411103_Stubbington.pdf - Published version

Download (1MB) | Preview

Abstract

Climate change is altering the water cycle globally, increasing the frequency and magnitude of floods and droughts. An outstanding question is whether biodiversity responses to hydrological disturbance depend on background climatic context – and if so, which contexts increase vulnerability to disturbance. Answering this question requires comparison of organismal responses across environmental gradients. However, opportunities to track disturbed communities against an undisturbed baseline remain rare. Here we gathered a global dataset capturing responses of aquatic invertebrate communities to river drying, which includes 112 sites spanning a gradient of climatic aridity. We measured the effects of river drying on taxonomic richness and temporal β‐diversity (turnover and nestedness components). We also measured the relative abundance of aquatic invertebrates with strategies that confer resilience (or resistance) to drying. Contrary to our expectations, we found that taxonomic richness recovered from drying similarly across the aridity gradient. The turnover component of β‐diversity (i.e. species replacements over time) largely accounted for differences in community composition before versus after drying. However, increasing aridity was associated with greater nestedness‐driven compositional changes at intermittent sites – that is, after drying communities became subsets of those before drying. These results show that climatic context can explain variation in community responses to the same hydrological disturbance (drying), and suggest that increased aridity will constrain biodiversity responses at regional scales. Further consideration of the climatic context in hydroecological research may help improve predictions of the local impacts of hydrological disturbance by identifying climate regions where communities are more (or less) sensitive to extremes, including river drying events.

Item Type: Journal article
Publication Title: Ecography
Creators: Vander Vorste, R., Stubbington, R., Acuña, V., Bogan, M.T., Bonada, N., Cid, N., Datry, T., Storey, R., Wood, P.J. and Ruhi, A.
Publisher: Wiley
Date: 23 February 2021
ISSN: 0906-7590
Identifiers:
NumberType
10.1111/ecog.05349DOI
1411091Other
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 26 Feb 2021 11:38
Last Modified: 26 Feb 2021 11:38
URI: http://irep.ntu.ac.uk/id/eprint/42400

Actions (login required)

Edit View Edit View

Views

Views per month over past year

Downloads

Downloads per month over past year