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Effects of temperature on hard clam (Mercenaria mercenaria) feeding and energetics
Descriptive
TitleInfo
Title
Effects of temperature on hard clam (Mercenaria mercenaria) feeding and energetics
Name
(type = personal)
NamePart
(type = family)
Specht
NamePart
(type = given)
Jaclyn A.
NamePart
(type = date)
1989-
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Jaclyn A. Specht
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(authority = RULIB)
author
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(type = personal)
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(type = family)
Fuchs
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(type = given)
Heidi
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Heidi Fuchs
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Advisory Committee
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chair
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(type = personal)
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Munroe
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Daphne
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Daphne Munroe
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Advisory Committee
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internal member
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(type = personal)
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(type = family)
Saba
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(type = given)
Grace
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Grace Saba
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Advisory Committee
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(authority = RULIB)
internal member
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Rutgers University
Role
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(authority = RULIB)
degree grantor
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School of Graduate Studies
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school
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Text
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theses
OriginInfo
DateCreated
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2017
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2017-10
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2017
Place
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xx
Language
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eng
Abstract
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Temperature can affect hard clam (Mercenaria mercenaria) health through its influences on metabolism, dissolved oxygen concentration, and suspension feeding. Warming seawater raises the standard metabolic rate by raising the kinetic energy and increasing the rates of biochemical reactions. Warming seawater also reduces the concentration of dissolved oxygen in the seawater. To compensate for the reduced dissolved oxygen concentration, hard clams may increase pumping efforts, raising the active metabolic rate. Higher pumping rates are also associated with higher food uptake rates from suspension feeding. However, it is unknown under what temperature conditions the metabolic gains from feeding can offset the increases in metabolic costs. Warming also decreases seawater viscosity and may affect ingestion rates through temperature-induced changes in viscous forces acting on ciliary beating. I conducted laboratory experiments to quantify the effects of temperature and temperature-induced viscosity change on M. mercenaria feeding and ciliary beat rates. I also quantified the effects of temperature on respiration and ingestion rates, and based on an energetic balance, I determined the net rate of energy change for hard clams over a temperature range of 4 to 36 ˚C. Ingestion and clearance rates varied with temperature but not with viscosity, and unresponsiveness to viscosity was confirmed by separate ciliary beat measurements on isolated gill preparations at different viscosities. The lack of feeding and ciliary response to viscosity indicates that M. mercenaria ingestion rates are driven by the thermal—not viscous—effects of temperature, a result that differs from previous findings for the mussel Mytilus edulis. Respiration and ingestion rates varied with temperature and peaked at 28 and 24 ˚C, respectively. The net rate of energy change peaked at 20 ˚C, 4 ˚C higher than mean New Jersey sea surface temperatures. These results have important implications for hard clams’ ability to survive and grow in a warming ocean and indicate that hard clams may benefit from moderate ocean warming, provided, among other factors, that there is sufficient food available.
Subject
(authority = RUETD)
Topic
Oceanography
Subject
(authority = ETD-LCSH)
Topic
Clams
Subject
(authority = ETD-LCSH)
Topic
Northern quahog--Physiology
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Rutgers University Electronic Theses and Dissertations
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ETD_8300
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (xii, 81 p. : ill.)
Note
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M.S.
Note
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Includes bibliographical references
Note
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by Jaclyn A. Specht
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School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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NjNbRU
Identifier
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doi:10.7282/T3B85C80
Genre
(authority = ExL-Esploro)
ETD graduate
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Rights
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The author owns the copyright to this work.
RightsHolder
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Name
FamilyName
Specht
GivenName
Jaclyn
MiddleName
A.
Role
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Type
Permission or license
DateTime
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2017-08-22 16:53:54
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Name
Jaclyn Specht
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Affiliation
Rutgers University. School of Graduate Studies
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License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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2017-10-31
DateTime
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2019-10-31
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2019.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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