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


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]


Copyright Statement

2017 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.aquaculture.2017.04.035


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 (ṀO2), and heart rate were determined in 22 month 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 23 C 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 ṀO2/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 ṀO2 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, hybrid vigor, abalone, heart rate, oxygen consumption rate, movement
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal physiological ecology
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Alter, K (Ms Katharina Alter)
UTAS Author:Andrewartha, SJ (Dr Sarah Andrewartha)
UTAS Author:Clark, TD (Dr Timothy Clark)
UTAS Author:Leon, RI (Mr Rafael Leon)
ID Code:116101
Year Published:2017
Web of Science® Times Cited:8
Deposited By:Fisheries and Aquaculture
Deposited On:2017-05-01
Last Modified:2018-03-21
Downloads:7 View Download Statistics

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