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Transgenerational Variation in Metabolism and Life-History Traits Induced by Maternal Hypoxia in Daphnia magna *.
MedLine Citation:
PMID:  23099460     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Abstract Hypoxic stress can alter conspecific phenotype and additionally alter phenotypes of the filial generation, for example, via maternal or epigenetic processes. Lasting effects can also be seen across development and generations even after stressors have been removed. This study utilized the model of rapidly developing, parthenogenetic Daphnia to examine the intraspecific variability of response of exposure of a parental generation to hypoxia (4 kPa) within a single clone line across development, across broods, and across generations. Body mass across development and reproductive output were monitored in the parental generation and the first three broods of the first filial generation (which were not directly exposed to hypoxia). O(2) consumption across a wide Po(2) range (normoxia to anoxia) was assessed to determine whether exposure of the parental generation to hypoxia conferred hypoxia tolerance on the offspring and whether this transgenerational, epigenetic phenomenon varied intraspecifically. Differences in mass occurred in both the parental generation (hypoxia-exposed smaller during brood 1 and brood 2 neonate production) and the filial generation (e.g., brood 1 and 2 neonates from hypoxic mothers were initially smaller than control neonates). However, differences in mass were not accompanied by changes in reproductive output (assessed by brood number and neonate size). At day 0, first filial generation brood 1 neonates from hypoxia-exposed mothers had a higher metabolic rate than control neonates. However, this effect, like that of body mass, dissipated with development within a brood but also with subsequent broods. An isometric scaling exponent for [Formula: see text] was repeatedly observed across a wide Po(2) range (21-2 kPa) throughout neonatal development.
Authors:
Sarah J Andrewartha; Warren W Burggren
Publication Detail:
Type:  Journal Article     Date:  2012-08-02
Journal Detail:
Title:  Physiological and biochemical zoology : PBZ     Volume:  85     ISSN:  1537-5293     ISO Abbreviation:  Physiol. Biochem. Zool.     Publication Date:    2012 Nov-Dec
Date Detail:
Created Date:  2012-10-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883369     Medline TA:  Physiol Biochem Zool     Country:  United States    
Other Details:
Languages:  eng     Pagination:  625-34     Citation Subset:  IM    
Affiliation:
Developmental and Integrative Biology, Department of Biological Sciences, University of North Texas, 1155 Union Circle #305220, Denton, Texas 76203.
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