NDLI: Genetically enhanced growth causes increased mortality in hypoxic environments

Content Provider	PubMed Central
Author	Sundt-hansen, L. Sundström, L. F Einum, S. Hindar, K. Fleming, I. A Devlin, R. H
Copyright Year	2007
Abstract	Rapid growth and development are associated with several fitness-related benefits. Yet, organisms usually grow more slowly than their physiological maximum, suggesting that rapid growth may carry costs. Here we use coho salmon (Oncorhynchus kisutch) eggs of wild and transgenic genotypes to test whether rapid growth causes reduced tolerance to low levels of oxygen (hypoxia). Eggs were exposed to four different durations of hypoxia, and survival and growth were recorded until the end of the larval stage. Survival rates decreased with increasing duration of hypoxia, but this decrease was most pronounced for the transgenic group. Larval mass was also negatively affected by hypoxia; however, transgenic genotypes were significantly larger than wild genotypes at the end of the larval stage. Oxygen can be a limiting factor for survival and development in a wide range of organisms, particularly during the egg stage. Thus, the reduced ability of fast-growing genotypes to cope with low oxygen levels identified in the present study may represent a general constraint on evolution of rapid growth across taxa.
Related Links	http://dx.doi.org/10.1098/rsbl.2006.0598
Ending Page	168
Page Count	4
Starting Page	165
File Format	PDF
ISSN	17449561
e-ISSN	1744957X
Journal	Biology Letters
Issue Number	2
Volume Number	3
Language	English
Publisher	The Royal Society
Publisher Date	2007-04-22
Access Restriction	Open
Rights Holder	The Royal Society
Subject Keyword	Agricultural and Biological Sciences (miscellaneous) Agricultural and Biological Sciences(all) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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