Temperature-dependent benefits of bacterial exposure in embryonic development of Daphnia magna resting eggs

The Journal of Experimental Biology
Alexandra A MushegianDieter Ebert

Abstract

The environments in which animals develop and evolve are profoundly shaped by bacteria, which affect animals both indirectly through their role in biogeochemical processes and directly through antagonistic or beneficial interactions. The outcomes of these activities can differ according to environmental context. In a series of laboratory experiments with diapausing eggs of the water flea Daphnia magna, we manipulated two environmental parameters, temperature and presence of bacteria, and examined their effect on development. At elevated temperatures (≥ 26 °C), resting eggs developing without live bacteria had reduced hatching success and correspondingly higher rates of severe morphological abnormalities compared with eggs with bacteria in their environment. The beneficial effect of bacteria was strongly reduced at 20 °C. Neither temperature nor the presence of bacteria affected directly developing parthenogenetic eggs. The mechanistic basis of this effect of bacteria on development is unclear, but these results highlight the complex interplay of biotic and abiotic factors influencing animal development after diapause.

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Citations

May 31, 2017·The Journal of Animal Ecology·Alexandra A MushegianDieter Ebert
Mar 12, 2021·Journal of Evolutionary Biology·Luca CornettiDieter Ebert
Nov 22, 2019·Environmental Science & Technology·Jiunn C FongMarilou P Sison-Mangus

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