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Burrowing behavior protects a threatened freshwater mussel in drying rivers
Journal article   Peer reviewed

Burrowing behavior protects a threatened freshwater mussel in drying rivers

A.J. Lymbery, L. Ma, S.J. Lymbery, M.W. Klunzinger, S.J. Beatty and D.L. Morgan
Hydrobiologia, Vol.848, pp.3141-3152
2021
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Abstract

Reduced streamflow because of climate change presents a major threat to aquatic biodiversity in arid, semi-arid and Mediterranean climatic regions. Freshwater mussels are particularly sensitive to this threat, because of their sedentary nature and limited mobility as juveniles or adults. The freshwater mussel Westralunio carteri, which is endemic to south-western Australia, has undergone a 49% reduction in range in the last 50 years, and a drying climate presents substantial extinction risk, as highlighted by two recent cases of mass mortality. Experimental studies found that mussels respond to water emersion by first tracking receding water levels, then burrowing. The amount of horizontal movement by mussels was not affected by size, but smaller mussels initiated burrowing sooner and were also more likely to be predated if they remained on the surface. Burrowing and shading both significantly reduced mortality rate and increased survival time when mussels were exposed to drying; when shaded or allowed to burrow, mussels could survive at least 62 days out of water. Predicted future reductions in streamflow are likely to increase the mortality rate in W. carteri, but it may be possible to partially avert the adverse effects of drying rivers by increasing riparian shading.

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UN Sustainable Development Goals (SDGs)

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#14 Life Below Water

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Collaboration types
Domestic collaboration
International collaboration
Citation topics
3 Agriculture, Environment & Ecology
3.2 Marine Biology
3.2.1002 Bivalve Ecology
Web Of Science research areas
Marine & Freshwater Biology
ESI research areas
Plant & Animal Science
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