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2012-Transgenerational_variation_in_metabolism_and_life-history_traits_induced_by_maternal_hypoxia_in_daphnia_magna.pdf (466.9 kB)

Transgenerational variation in metabolism and life-history traits induced by maternal hypoxia in Daphnia magna

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posted on 2023-05-20, 02:11 authored by Sarah AndrewarthaSarah Andrewartha, Burggren, WW
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). O2 consumption across a wide PO2 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 V·O2 was repeatedly observed across a wide PO2 range (21–2 kPa) throughout neonatal development.

History

Publication title

Physiological and Biochemical Zoology

Volume

85

Issue

6

Pagination

625-634

ISSN

1522-2152

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Univ Chicago Press

Place of publication

1427 E 60Th St, Chicago, USA, Il, 60637-2954

Rights statement

Copyright 2012 by The University of Chicago

Repository Status

  • Open

Socio-economic Objectives

Expanding knowledge in the biological sciences

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