Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana
With marshes deteriorating rapidly across the Louisiana coast, the role of seagrasses in sustaining fisheries has come into question. Seagrasses are known to shelter small fish from larger predators. Seagrasses also act as a foraging ground for commercially important species, including spotted seatr...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
LSU Scholarly Repository
2007
|
Subjects: | |
Online Access: | https://repository.lsu.edu/gradschool_theses/1137 https://doi.org/10.31390/gradschool_theses.1137 https://repository.lsu.edu/context/gradschool_theses/article/2136/viewcontent/Maiaro_thesis.pdf |
id |
ftlouisianastuir:oai:repository.lsu.edu:gradschool_theses-2136 |
---|---|
record_format |
openpolar |
spelling |
ftlouisianastuir:oai:repository.lsu.edu:gradschool_theses-2136 2024-09-15T18:41:07+00:00 Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana Maiaro, Jamie Lynn 2007-01-01T08:00:00Z application/pdf https://repository.lsu.edu/gradschool_theses/1137 https://doi.org/10.31390/gradschool_theses.1137 https://repository.lsu.edu/context/gradschool_theses/article/2136/viewcontent/Maiaro_thesis.pdf unknown LSU Scholarly Repository https://repository.lsu.edu/gradschool_theses/1137 doi:10.31390/gradschool_theses.1137 https://repository.lsu.edu/context/gradschool_theses/article/2136/viewcontent/Maiaro_thesis.pdf LSU Master's Theses species composition community structure seagrass Hurricane Cindy Huricane Katrina Zannichellia palustris Ruppia maritima Oceanography and Atmospheric Sciences and Meteorology text 2007 ftlouisianastuir https://doi.org/10.31390/gradschool_theses.1137 2024-08-08T04:27:16Z With marshes deteriorating rapidly across the Louisiana coast, the role of seagrasses in sustaining fisheries has come into question. Seagrasses are known to shelter small fish from larger predators. Seagrasses also act as a foraging ground for commercially important species, including spotted seatrout. Thirty samples, fifteen from seagrass habitats and fifteen from bare substrate habitats, were collected inside Biloxi Marsh using a drop sampler in May 2005. After the passage of Hurricanes Cindy and Katrina on July 6, 2005 and August 29, 2005, respectively, the seagrasses in Biloxi Marsh were either uprooted, buried, or both. The May 2005 sites were re-sampled in August 2005 and May 2006 for comparison of pre- and post-hurricane communities. Multidimensional Scaling (MDS) analysis, followed by MANOVA was used to assess overall community structure and species composition, whereas canonical correlation was used to assess the influence of environmental variables on communities. Results show differences in seagrass and bare substrate communities prior to hurricane passage in May 2005. However, post-Cindy, the sites with remaining seagrass resembled the seagrass sites of May 2005, while those without seagrass resembled the bare sites of May 2005. After Cindy, canonical correlation analysis showed that the variables of bottom type, habitat type, month, salinity, turbidity, dry weight of seagrasses, Farfantepenaeus aztecus, Lucania parva, Palaemonetes pugio and Syngnathus scovelli loaded heavily on the first canonical variable, while habitat type, month, substrate, and Sphoeroides parvus loaded heavily on the second. Post-Katrina, all sites were bare, and thus resembled the bare substrate sites of May 2005. Post-Katrina canonical correlation revealed heavy loadings of bottom type, habitat type, year, salinity, dissolved oxygen, turbidity, dry weight, Anchoa mitchilli, Lucania parva, Mysidopsis spp., Palaemonetes pugio, and Syngnathus scovelli. Changes in community structure and species composition observed after the ... Text Zannichellia palustris LSU Digital Commons (Louisiana State University) |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
species composition community structure seagrass Hurricane Cindy Huricane Katrina Zannichellia palustris Ruppia maritima Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
species composition community structure seagrass Hurricane Cindy Huricane Katrina Zannichellia palustris Ruppia maritima Oceanography and Atmospheric Sciences and Meteorology Maiaro, Jamie Lynn Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
topic_facet |
species composition community structure seagrass Hurricane Cindy Huricane Katrina Zannichellia palustris Ruppia maritima Oceanography and Atmospheric Sciences and Meteorology |
description |
With marshes deteriorating rapidly across the Louisiana coast, the role of seagrasses in sustaining fisheries has come into question. Seagrasses are known to shelter small fish from larger predators. Seagrasses also act as a foraging ground for commercially important species, including spotted seatrout. Thirty samples, fifteen from seagrass habitats and fifteen from bare substrate habitats, were collected inside Biloxi Marsh using a drop sampler in May 2005. After the passage of Hurricanes Cindy and Katrina on July 6, 2005 and August 29, 2005, respectively, the seagrasses in Biloxi Marsh were either uprooted, buried, or both. The May 2005 sites were re-sampled in August 2005 and May 2006 for comparison of pre- and post-hurricane communities. Multidimensional Scaling (MDS) analysis, followed by MANOVA was used to assess overall community structure and species composition, whereas canonical correlation was used to assess the influence of environmental variables on communities. Results show differences in seagrass and bare substrate communities prior to hurricane passage in May 2005. However, post-Cindy, the sites with remaining seagrass resembled the seagrass sites of May 2005, while those without seagrass resembled the bare sites of May 2005. After Cindy, canonical correlation analysis showed that the variables of bottom type, habitat type, month, salinity, turbidity, dry weight of seagrasses, Farfantepenaeus aztecus, Lucania parva, Palaemonetes pugio and Syngnathus scovelli loaded heavily on the first canonical variable, while habitat type, month, substrate, and Sphoeroides parvus loaded heavily on the second. Post-Katrina, all sites were bare, and thus resembled the bare substrate sites of May 2005. Post-Katrina canonical correlation revealed heavy loadings of bottom type, habitat type, year, salinity, dissolved oxygen, turbidity, dry weight, Anchoa mitchilli, Lucania parva, Mysidopsis spp., Palaemonetes pugio, and Syngnathus scovelli. Changes in community structure and species composition observed after the ... |
format |
Text |
author |
Maiaro, Jamie Lynn |
author_facet |
Maiaro, Jamie Lynn |
author_sort |
Maiaro, Jamie Lynn |
title |
Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
title_short |
Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
title_full |
Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
title_fullStr |
Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
title_full_unstemmed |
Disturbance effects on nekton communities of seagrasses and bare substrates in Biloxi Marsh, Louisiana |
title_sort |
disturbance effects on nekton communities of seagrasses and bare substrates in biloxi marsh, louisiana |
publisher |
LSU Scholarly Repository |
publishDate |
2007 |
url |
https://repository.lsu.edu/gradschool_theses/1137 https://doi.org/10.31390/gradschool_theses.1137 https://repository.lsu.edu/context/gradschool_theses/article/2136/viewcontent/Maiaro_thesis.pdf |
genre |
Zannichellia palustris |
genre_facet |
Zannichellia palustris |
op_source |
LSU Master's Theses |
op_relation |
https://repository.lsu.edu/gradschool_theses/1137 doi:10.31390/gradschool_theses.1137 https://repository.lsu.edu/context/gradschool_theses/article/2136/viewcontent/Maiaro_thesis.pdf |
op_doi |
https://doi.org/10.31390/gradschool_theses.1137 |
_version_ |
1810485549022052352 |