Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats
Many marine ecosystems are facing the growing threat of biological invasions. These invasions can have a variety of different impacts on ecosystems and their inhabitants. The Pacific oyster, Crassostrea gigas, is currently in the relatively early stages of invasion in San Diego estuaries. Crassostre...
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ftunivsandiego:oai:digital.sandiego.edu:theses-1055 2023-05-15T15:57:28+02:00 Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats Jansen-Yee, Noah 2022-01-14T08:00:00Z application/pdf https://digital.sandiego.edu/theses/53 https://digital.sandiego.edu/cgi/viewcontent.cgi?article=1055&context=theses unknown Digital USD https://digital.sandiego.edu/theses/53 https://digital.sandiego.edu/cgi/viewcontent.cgi?article=1055&context=theses Theses Oyster Ecology Invasive Species Ecosystem Engineer Crassostrea Gigas Marine Macrofauna Infauna Aquaculture and Fisheries Biodiversity Marine Biology text 2022 ftunivsandiego 2022-05-02T06:48:00Z Many marine ecosystems are facing the growing threat of biological invasions. These invasions can have a variety of different impacts on ecosystems and their inhabitants. The Pacific oyster, Crassostrea gigas, is currently in the relatively early stages of invasion in San Diego estuaries. Crassostrea gigas is a large, filter-feeding bivalve that forms dense oyster beds on hard substrate. These oysters are known to outcompete native counterparts and drastically alter habitats where they are present. Crassostrea gigas is an ecosystem engineer that, through shell creation and formation of a dense oyster matrix, impacts ecosystems in a variety of direct and indirect ways. However, the impacts of this ecosystem engineer at an early stage of invasion are not well-understood. To investigate the effects of C. gigas in a relatively recently-invaded site, this study examined the relationships between oyster beds and macrofaunal assemblages in Los Peñasquitos Lagoon, San Diego, California, USA. Mudflat areas with oyster beds had markedly higher total abundance, species richness, and biomass of resident macrofauna, with bivalves (not counting the oysters themselves), amphipods, and decapods tending to have higher densities and biomass in oyster beds. Interestingly, for the range of oyster beds examined here, there were minimal associations between the amount of actual shell material present and macrofaunal properties, suggesting that there may be a threshold associated with bed impacts. Overall, the findings of this study align with similar conclusions of other global studies in suggesting that C. gigas as invaders and ecosystem engineers have potentially large impacts on the biodiversity, and that this should be an important consideration in considering management of this non-native bivalve and coastal ecosystems. Text Crassostrea gigas Pacific oyster University of San Diego: Digital@USanDiego Pacific |
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collection |
University of San Diego: Digital@USanDiego |
op_collection_id |
ftunivsandiego |
language |
unknown |
topic |
Oyster Ecology Invasive Species Ecosystem Engineer Crassostrea Gigas Marine Macrofauna Infauna Aquaculture and Fisheries Biodiversity Marine Biology |
spellingShingle |
Oyster Ecology Invasive Species Ecosystem Engineer Crassostrea Gigas Marine Macrofauna Infauna Aquaculture and Fisheries Biodiversity Marine Biology Jansen-Yee, Noah Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
topic_facet |
Oyster Ecology Invasive Species Ecosystem Engineer Crassostrea Gigas Marine Macrofauna Infauna Aquaculture and Fisheries Biodiversity Marine Biology |
description |
Many marine ecosystems are facing the growing threat of biological invasions. These invasions can have a variety of different impacts on ecosystems and their inhabitants. The Pacific oyster, Crassostrea gigas, is currently in the relatively early stages of invasion in San Diego estuaries. Crassostrea gigas is a large, filter-feeding bivalve that forms dense oyster beds on hard substrate. These oysters are known to outcompete native counterparts and drastically alter habitats where they are present. Crassostrea gigas is an ecosystem engineer that, through shell creation and formation of a dense oyster matrix, impacts ecosystems in a variety of direct and indirect ways. However, the impacts of this ecosystem engineer at an early stage of invasion are not well-understood. To investigate the effects of C. gigas in a relatively recently-invaded site, this study examined the relationships between oyster beds and macrofaunal assemblages in Los Peñasquitos Lagoon, San Diego, California, USA. Mudflat areas with oyster beds had markedly higher total abundance, species richness, and biomass of resident macrofauna, with bivalves (not counting the oysters themselves), amphipods, and decapods tending to have higher densities and biomass in oyster beds. Interestingly, for the range of oyster beds examined here, there were minimal associations between the amount of actual shell material present and macrofaunal properties, suggesting that there may be a threshold associated with bed impacts. Overall, the findings of this study align with similar conclusions of other global studies in suggesting that C. gigas as invaders and ecosystem engineers have potentially large impacts on the biodiversity, and that this should be an important consideration in considering management of this non-native bivalve and coastal ecosystems. |
format |
Text |
author |
Jansen-Yee, Noah |
author_facet |
Jansen-Yee, Noah |
author_sort |
Jansen-Yee, Noah |
title |
Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
title_short |
Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
title_full |
Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
title_fullStr |
Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
title_full_unstemmed |
Crassostrea gigas Invasion in Southern California: Macrofaunal Diversity and Local Community Impacts of Ecosystem Engineers on Estuarine Habitats |
title_sort |
crassostrea gigas invasion in southern california: macrofaunal diversity and local community impacts of ecosystem engineers on estuarine habitats |
publisher |
Digital USD |
publishDate |
2022 |
url |
https://digital.sandiego.edu/theses/53 https://digital.sandiego.edu/cgi/viewcontent.cgi?article=1055&context=theses |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Crassostrea gigas Pacific oyster |
genre_facet |
Crassostrea gigas Pacific oyster |
op_source |
Theses |
op_relation |
https://digital.sandiego.edu/theses/53 https://digital.sandiego.edu/cgi/viewcontent.cgi?article=1055&context=theses |
_version_ |
1766393128589197312 |