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Hybrid abalone are more robust to multi-stressor environments than pure parental species

Citation

Alter, K and Andrewartha, SJ and Morash, AJ and Clark, TD and Hellicar, AD and Leon, RI and Elliott, NG, Hybrid abalone are more robust to multi-stressor environments than pure parental species, Aquaculture, 478 pp. 25-34. ISSN 0044-8486 (2017) [Refereed Article]


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Copyright Statement

2017 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.aquaculture.2017.04.035

Abstract

Many hybrids of marine molluscs show improved growth in comparison to their pure parental species. Yet, little is known about the physiological mechanisms underlying the better hybrid performance. In this study, movement, oxygen consumption rate (View the MathML source), and heart rate were determined in 22month old cultured abalone Haliotis rubra, H. laevigata and their interspecies hybrid, the latter of which exhibits improved growth rate. Abalone were exposed to an acute temperature increase following acclimation to 16 or 23C at high and low oxygen levels (100% or 70% air saturation, respectively). Movement of hybrids and H. laevigata was generally not affected by temperature and oxygen levels, yet H. rubra showed a strong thermal response. Heart rate and View the MathML source/temperature slopes revealed that hybrids were least affected by oxygen levels. Arrhenius break-point temperatures of hybrids and H. laevigata, but not H. rubra, were generally higher when abalone were acclimated to 23C in comparison to 16C. The hybrid had more stable maximum heart rate and View the MathML source values across acclimation conditions in comparison to H. laevigata and H. rubra. Thus, it appears that hybrids are able to maintain physiological functions over a broader environmental range. This improved tolerance to environmental fluctuations may bolster energy metabolism and improve growth in variable environments such as aquaculture farms.

Item Details

Item Type:Refereed Article
Keywords:abalone aquaculture, environmental variability
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Physiological Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
Author:Alter, K (Ms Katharina Alter)
Author:Andrewartha, SJ (Dr Sarah Andrewartha)
Author:Clark, TD (Dr Timothy Clark)
Author:Leon, RI (Mr Rafael Leon)
ID Code:116101
Year Published:2017
Deposited By:Centre for Fisheries and Aquaculture
Deposited On:2017-05-01
Last Modified:2017-07-10
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