Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure
The hadal zone is the common name for the deepest section of the ocean (6,000-11,000 m depth). It encompasses 45 % of the ocean’s depth range, and is mostly represented by oceanic trenches. Trench habitats lack sufficient sampling and the communities within are not well understood. Often, samples ar...
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ftvuwellington:oai:researcharchive.vuw.ac.nz:10063/5052 2023-08-15T12:41:11+02:00 Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure Wilson, James Peter Ashley Ryan, Ken Schnabel, Kareen 2015 http://researcharchive.vuw.ac.nz/handle/10063/5052 en_NZ eng Victoria University of Wellington http://researcharchive.vuw.ac.nz/handle/10063/5052 Amphipoda Trench Morphometrics Text Master's 2015 ftvuwellington 2023-07-25T17:25:46Z The hadal zone is the common name for the deepest section of the ocean (6,000-11,000 m depth). It encompasses 45 % of the ocean’s depth range, and is mostly represented by oceanic trenches. Trench habitats lack sufficient sampling and the communities within are not well understood. Often, samples are derived from a single depth and thus the population dynamics of trench communities have not been analysed comprehensively. Scavenging amphipods are abundant and diverse taxa in the trench environment, and have been found in every trench sampled to date. They rapidly intercept and consume carrion falls at the deepest trench depths, and act as key prey items to predators in the shallower depths of the hadal zone. There appears to be a relationship of increasing abundance and decreasing diversity of scavenging amphipods with depth. However in the Tonga Trench, sampling of hadal amphipods has been limited, and these patterns remain unclear. The QUELLE (Quest for the Limit of Life) project in 2013 was led by The Japan Agency for Marine-Earth Science and Technology (JAMSTEC). As part of this project, the YOK 13-10 voyage examined scavenging amphipods in the Tonga Trench. The voyage used baited traps to sample depths of ˜6,250 m and ˜10,800 m from October 6 – October 21 in 2013. The main objectives of the present study were to: identify scavenging amphipod assemblages within the Tonga Trench and compare them to other trenches of the South Pacific; analyse the population structure of Hirondellea dubia between depths in the Tonga Trench; and identify a suitable total length proxy for H. dubia. Six species of amphipods were identified from depths of ˜6,250 m and ˜10,800 m in the Tonga Trench. At ˜6,250 m Alicella gigantea, Eurythenes gryllus, H. dubia, Bathycallisoma schellenbergi, an alicellid species, and a gammarid species were recovered. In contrast, H. dubia was the only species recovered from ˜10,800 m. The abundance of amphipods was higher at the ˜10,800 m site while the diversity was much lower. The assemblage of ... Master Thesis Eurythenes gryllus Victoria University of Wellington: ResearchArchive Pacific Tonga ENVELOPE(7.990,7.990,63.065,63.065) |
institution |
Open Polar |
collection |
Victoria University of Wellington: ResearchArchive |
op_collection_id |
ftvuwellington |
language |
English |
topic |
Amphipoda Trench Morphometrics |
spellingShingle |
Amphipoda Trench Morphometrics Wilson, James Peter Ashley Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
topic_facet |
Amphipoda Trench Morphometrics |
description |
The hadal zone is the common name for the deepest section of the ocean (6,000-11,000 m depth). It encompasses 45 % of the ocean’s depth range, and is mostly represented by oceanic trenches. Trench habitats lack sufficient sampling and the communities within are not well understood. Often, samples are derived from a single depth and thus the population dynamics of trench communities have not been analysed comprehensively. Scavenging amphipods are abundant and diverse taxa in the trench environment, and have been found in every trench sampled to date. They rapidly intercept and consume carrion falls at the deepest trench depths, and act as key prey items to predators in the shallower depths of the hadal zone. There appears to be a relationship of increasing abundance and decreasing diversity of scavenging amphipods with depth. However in the Tonga Trench, sampling of hadal amphipods has been limited, and these patterns remain unclear. The QUELLE (Quest for the Limit of Life) project in 2013 was led by The Japan Agency for Marine-Earth Science and Technology (JAMSTEC). As part of this project, the YOK 13-10 voyage examined scavenging amphipods in the Tonga Trench. The voyage used baited traps to sample depths of ˜6,250 m and ˜10,800 m from October 6 – October 21 in 2013. The main objectives of the present study were to: identify scavenging amphipod assemblages within the Tonga Trench and compare them to other trenches of the South Pacific; analyse the population structure of Hirondellea dubia between depths in the Tonga Trench; and identify a suitable total length proxy for H. dubia. Six species of amphipods were identified from depths of ˜6,250 m and ˜10,800 m in the Tonga Trench. At ˜6,250 m Alicella gigantea, Eurythenes gryllus, H. dubia, Bathycallisoma schellenbergi, an alicellid species, and a gammarid species were recovered. In contrast, H. dubia was the only species recovered from ˜10,800 m. The abundance of amphipods was higher at the ˜10,800 m site while the diversity was much lower. The assemblage of ... |
author2 |
Ryan, Ken Schnabel, Kareen |
format |
Master Thesis |
author |
Wilson, James Peter Ashley |
author_facet |
Wilson, James Peter Ashley |
author_sort |
Wilson, James Peter Ashley |
title |
Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
title_short |
Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
title_full |
Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
title_fullStr |
Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
title_full_unstemmed |
Scavenging amphipods of the Tonga Trench: an analysis of community assemblage and population structure |
title_sort |
scavenging amphipods of the tonga trench: an analysis of community assemblage and population structure |
publisher |
Victoria University of Wellington |
publishDate |
2015 |
url |
http://researcharchive.vuw.ac.nz/handle/10063/5052 |
long_lat |
ENVELOPE(7.990,7.990,63.065,63.065) |
geographic |
Pacific Tonga |
geographic_facet |
Pacific Tonga |
genre |
Eurythenes gryllus |
genre_facet |
Eurythenes gryllus |
op_relation |
http://researcharchive.vuw.ac.nz/handle/10063/5052 |
_version_ |
1774294355591299072 |