Invasive species in Weddell Sea : Effects on food web structure
The cold water of Antarctica has a unique endemic fauna, where durophagous predators are rare or absent. Due to climate change the water is heating up and the predators have begun to return to the Southern Ocean, which could bring a lot of changes to the food web. There is a high risk it will lead t...
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Linköpings universitet, Institutionen för fysik, kemi och biologi
2020
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ftlinkoepinguniv:oai:DiVA.org:liu-170744 2023-05-15T13:53:33+02:00 Invasive species in Weddell Sea : Effects on food web structure Wohlfarth, Inger-Marie 2020 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170744 eng eng Linköpings universitet, Institutionen för fysik, kemi och biologi http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170744 info:eu-repo/semantics/openAccess Centrality Climate change Food webs Google PageRank Invasive species Structure Weddell Sea Ecology Ekologi Student thesis info:eu-repo/semantics/bachelorThesis text 2020 ftlinkoepinguniv 2022-05-01T08:23:15Z The cold water of Antarctica has a unique endemic fauna, where durophagous predators are rare or absent. Due to climate change the water is heating up and the predators have begun to return to the Southern Ocean, which could bring a lot of changes to the food web. There is a high risk it will lead to losses in the unique marine fauna of Antarctica. The aim of this study is therefore to examine the potential effect these invasive species has on the food web structure in the Weddell Sea. To study this, several general network metrics were used (connectance, number of interactions, vulnerability and generality, trait distributions), as well as a number of centrality metrics (betweenness, closeness, PageRank). The analyses showed that none of the invasive species become important in the Weddell Sea food web. Nor do they significantly change the food web structure in any way which impact the importance of the native species. Their great opportunism regarding their prey species, and thereby their connectedness and thus their position in the network, are probably the main reason why theses invasive species did not become important in this food web. The lack of changes in the food web structure due to the presence of these invasive species are probably also a result of not including factors such as abundances and network dynamics in the analyses, which seem to be the driving forces when it comes to changes in food web structure caused by invasion of species. Bachelor Thesis Antarc* Antarctica Southern Ocean Weddell Sea LIU - Linköping University: Publications (DiVA) Southern Ocean Weddell Sea Weddell |
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Open Polar |
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LIU - Linköping University: Publications (DiVA) |
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ftlinkoepinguniv |
language |
English |
topic |
Centrality Climate change Food webs Google PageRank Invasive species Structure Weddell Sea Ecology Ekologi |
spellingShingle |
Centrality Climate change Food webs Google PageRank Invasive species Structure Weddell Sea Ecology Ekologi Wohlfarth, Inger-Marie Invasive species in Weddell Sea : Effects on food web structure |
topic_facet |
Centrality Climate change Food webs Google PageRank Invasive species Structure Weddell Sea Ecology Ekologi |
description |
The cold water of Antarctica has a unique endemic fauna, where durophagous predators are rare or absent. Due to climate change the water is heating up and the predators have begun to return to the Southern Ocean, which could bring a lot of changes to the food web. There is a high risk it will lead to losses in the unique marine fauna of Antarctica. The aim of this study is therefore to examine the potential effect these invasive species has on the food web structure in the Weddell Sea. To study this, several general network metrics were used (connectance, number of interactions, vulnerability and generality, trait distributions), as well as a number of centrality metrics (betweenness, closeness, PageRank). The analyses showed that none of the invasive species become important in the Weddell Sea food web. Nor do they significantly change the food web structure in any way which impact the importance of the native species. Their great opportunism regarding their prey species, and thereby their connectedness and thus their position in the network, are probably the main reason why theses invasive species did not become important in this food web. The lack of changes in the food web structure due to the presence of these invasive species are probably also a result of not including factors such as abundances and network dynamics in the analyses, which seem to be the driving forces when it comes to changes in food web structure caused by invasion of species. |
format |
Bachelor Thesis |
author |
Wohlfarth, Inger-Marie |
author_facet |
Wohlfarth, Inger-Marie |
author_sort |
Wohlfarth, Inger-Marie |
title |
Invasive species in Weddell Sea : Effects on food web structure |
title_short |
Invasive species in Weddell Sea : Effects on food web structure |
title_full |
Invasive species in Weddell Sea : Effects on food web structure |
title_fullStr |
Invasive species in Weddell Sea : Effects on food web structure |
title_full_unstemmed |
Invasive species in Weddell Sea : Effects on food web structure |
title_sort |
invasive species in weddell sea : effects on food web structure |
publisher |
Linköpings universitet, Institutionen för fysik, kemi och biologi |
publishDate |
2020 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170744 |
geographic |
Southern Ocean Weddell Sea Weddell |
geographic_facet |
Southern Ocean Weddell Sea Weddell |
genre |
Antarc* Antarctica Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctica Southern Ocean Weddell Sea |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170744 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766258731972034560 |