Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community
A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Coastal Marine Systems Science The purpose of this dissertation research was to investigate how predation affects oyster distribution and reef community structure by examining: 1) non lethal...
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fttexasamucorpus:oai:tamucc-ir.tdl.org:1969.6/283 2023-10-25T01:43:14+02:00 Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community Johnson, Keith Smee, Delbert Lee 2012-07-23T21:11:47Z application/pdf http://hdl.handle.net/1969.6/283 en_US eng http://hdl.handle.net/1969.6/283 This material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher. Crassostrea virginica oyster reef community mud crab top down forces lethal and non lethal effects blue crabs red drum Text Dissertation 2012 fttexasamucorpus 2023-09-25T10:20:55Z A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Coastal Marine Systems Science The purpose of this dissertation research was to investigate how predation affects oyster distribution and reef community structure by examining: 1) non lethal predation effects on bivalves by size of prey; 2) the lethal and non lethal effects that influence survival and resource allocation in oysters; 3) predation affects distribution patterns of oysters; 4) top-down forces and seasonal effects on oyster reef community structure. Although Eastern oysters, Crassostrea virginica, are ecologically and economically important, oyster populations are declining in many areas and have decreased 85% worldwide. Like many communities, predation or top-down forces can have significant effects on the structure and function of oyster reef communities. The purpose of this study was to ascertain how oyster recruitment, survival, growth and distribution as well as oyster reef community structure were influenced by lethal and non lethal effects of predators. Results from a series of manipulative field experiments indicate that predators have significant effects on oyster reef community structure and oyster recruitment, but, these effects are significantly more important in the fall than spring. Oyster recruitment and spat survival is strongly affected by the abundance of intermediate consumers, most notably the Atlantic mud crab (Panopeus herbstii). In the absence of higher order predators including blue crabs (Callinectes sapidus) and red drum (Scianops ocellatus), mud crabs increased in number and preyed more heavily on newly settled oysters. Mud crabs also caused oysters to change their resource allocation to more shell and less tissue at a cost of lowering fecundity. Finally, oysters are limited to intertidal habitats in Corpus Christi Bay, and these results indicate that oysters are restricted to intertidal habitats by predators. This study elucidates how predators have significant ... Doctoral or Postdoctoral Thesis Red drum Texas A&M University - Corpus Christi: DSpace Repository |
institution |
Open Polar |
collection |
Texas A&M University - Corpus Christi: DSpace Repository |
op_collection_id |
fttexasamucorpus |
language |
English |
topic |
Crassostrea virginica oyster reef community mud crab top down forces lethal and non lethal effects blue crabs red drum |
spellingShingle |
Crassostrea virginica oyster reef community mud crab top down forces lethal and non lethal effects blue crabs red drum Johnson, Keith Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
topic_facet |
Crassostrea virginica oyster reef community mud crab top down forces lethal and non lethal effects blue crabs red drum |
description |
A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Coastal Marine Systems Science The purpose of this dissertation research was to investigate how predation affects oyster distribution and reef community structure by examining: 1) non lethal predation effects on bivalves by size of prey; 2) the lethal and non lethal effects that influence survival and resource allocation in oysters; 3) predation affects distribution patterns of oysters; 4) top-down forces and seasonal effects on oyster reef community structure. Although Eastern oysters, Crassostrea virginica, are ecologically and economically important, oyster populations are declining in many areas and have decreased 85% worldwide. Like many communities, predation or top-down forces can have significant effects on the structure and function of oyster reef communities. The purpose of this study was to ascertain how oyster recruitment, survival, growth and distribution as well as oyster reef community structure were influenced by lethal and non lethal effects of predators. Results from a series of manipulative field experiments indicate that predators have significant effects on oyster reef community structure and oyster recruitment, but, these effects are significantly more important in the fall than spring. Oyster recruitment and spat survival is strongly affected by the abundance of intermediate consumers, most notably the Atlantic mud crab (Panopeus herbstii). In the absence of higher order predators including blue crabs (Callinectes sapidus) and red drum (Scianops ocellatus), mud crabs increased in number and preyed more heavily on newly settled oysters. Mud crabs also caused oysters to change their resource allocation to more shell and less tissue at a cost of lowering fecundity. Finally, oysters are limited to intertidal habitats in Corpus Christi Bay, and these results indicate that oysters are restricted to intertidal habitats by predators. This study elucidates how predators have significant ... |
author2 |
Smee, Delbert Lee |
format |
Doctoral or Postdoctoral Thesis |
author |
Johnson, Keith |
author_facet |
Johnson, Keith |
author_sort |
Johnson, Keith |
title |
Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
title_short |
Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
title_full |
Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
title_fullStr |
Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
title_full_unstemmed |
Eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
title_sort |
eastern oysters offer no pearl, but they might be in peril: understanding how lethal and non lethal predator effects influence oyster distribution and reef community |
publishDate |
2012 |
url |
http://hdl.handle.net/1969.6/283 |
genre |
Red drum |
genre_facet |
Red drum |
op_relation |
http://hdl.handle.net/1969.6/283 |
op_rights |
This material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher. |
_version_ |
1780740039964098560 |