NDLI: Responses to elevated CO2 exposure in a freshwater mussel, Fusconaia flava

Content Provider	Springer Nature Link
Author	Jeffrey, Jennifer D. Hannan, Kelly D. Hasler, Caleb T. Suski, Cory D.
Copyright Year	2016
Abstract	Freshwater mussels are some of the most imperiled species in North America and are particularly susceptible to environmental change. One environmental disturbance that mussels may encounter that remains understudied is an increase in the partial pressure of CO2 (pCO2). The present study quantified the impacts of acute (6 h) and chronic (up to 32 days) exposures to elevated pCO2 on genes associated with shell formation (chitin synthase; cs) and the stress response (heat shock protein 70; hsp70) in Fusconaia flava. Oxygen consumption (MO2) was also assessed over the chronic CO2 exposure period. Although mussels exhibited an increase in cs following an acute exposure to elevated pCO2, long-term exposure resulted in a decrease in cs mRNA abundance, suggesting that mussels may invest less in shell formation during chronic exposure to elevated pCO2. In response to an acute elevation in pCO2, mussels increased hsp70 mRNA abundance in mantle and adductor muscle and a similar increase was observed in the gill and adductor muscle in response to a chronic elevation in pCO2. A chronic elevation in pCO2 also increased mussel MO2. This overall increase in hsp70 mRNA levels and MO2 in F. flava indicates that exposure to elevated pCO2 initiates activation of the general stress response and an increased energy demand. Together, the results of the present study suggest that freshwater mussels respond to elevated pCO2 by increasing processes necessary to ‘deal with’ the stressor and, over the long-term, may reduce their investment in non-essential processes such as shell growth.
Starting Page	87
Ending Page	101
Page Count	15
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	187
Issue Number	1
e-ISSN	1432136X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-07-29
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chitin synthase Heat shock protein 70 Metabolic rate Bivalve Animal Physiology Biomedicine Human Physiology Zoology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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