Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri
The gammarid Paramoera walkeri is one of the most abundant amphipods in near-shore Antarctic waters. There has been increasing interest in P. walkeri as a test species for ecotoxicology studies and bio-monitoring for contaminants in Antarctica, but further information is needed to improve understand...
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Online Access: | https://epubs.scu.edu.au/esm_pubs/2628 https://doi.org/10.1007/s00300-015-1720-1 |
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ftsoutherncu:oai:epubs.scu.edu.au:esm_pubs-3642 2023-05-15T13:47:30+02:00 Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri Brown, Kathryn E King, Catherine K Harrison, Peter Lynton 2015-01-01T08:00:00Z https://epubs.scu.edu.au/esm_pubs/2628 https://doi.org/10.1007/s00300-015-1720-1 unknown ePublications@SCU School of Environment, Science and Engineering Papers Antarctica crustacean brooding reproduction post-marsupial development growth Environmental Sciences article 2015 ftsoutherncu https://doi.org/10.1007/s00300-015-1720-1 2019-08-06T12:54:03Z The gammarid Paramoera walkeri is one of the most abundant amphipods in near-shore Antarctic waters. There has been increasing interest in P. walkeri as a test species for ecotoxicology studies and bio-monitoring for contaminants in Antarctica, but further information is needed to improve understanding of its biology including reproduction, growth and early life history. Female P. walkeri brooding late-stage embryos were collected in summer from coastal waters in the Vestfold Hills region, East Antarctica, and were maintained in the laboratory. Timing of neonate release, brood size and early post-marsupial survival and growth (total length) of juveniles were recorded. Brood size ranged from 26 to 86 neonates per female, and juvenile survival rates were high (96 %). The increase in body length of juveniles ranged from 0.017 to 0.043 mm/day with a mean growth rate of 0.028 mm/day (0.94 % per day) over 11 weeks with strong evidence for exponential growth over time. The body lengths of laboratory-raised juveniles were not significantly different to those of wild-caught juveniles with the same number of segments (15) in the first antennae, indicating that growth may have progressed at a similar rate in vivo and in situ. Juvenile growth was similar when modelled over time or by addition of first antennal segments. This study provides new information on the reproductive biology and early life history of P. walkeri, with further evidence that Antarctic amphipods exhibit slow growth, even when food is not a limiting factor, compared with species from lower latitudes. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Southern Cross University: epublications@SCU Antarctic East Antarctica The Antarctic Vestfold Vestfold Hills Polar Biology 38 10 1583 1596 |
institution |
Open Polar |
collection |
Southern Cross University: epublications@SCU |
op_collection_id |
ftsoutherncu |
language |
unknown |
topic |
Antarctica crustacean brooding reproduction post-marsupial development growth Environmental Sciences |
spellingShingle |
Antarctica crustacean brooding reproduction post-marsupial development growth Environmental Sciences Brown, Kathryn E King, Catherine K Harrison, Peter Lynton Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
topic_facet |
Antarctica crustacean brooding reproduction post-marsupial development growth Environmental Sciences |
description |
The gammarid Paramoera walkeri is one of the most abundant amphipods in near-shore Antarctic waters. There has been increasing interest in P. walkeri as a test species for ecotoxicology studies and bio-monitoring for contaminants in Antarctica, but further information is needed to improve understanding of its biology including reproduction, growth and early life history. Female P. walkeri brooding late-stage embryos were collected in summer from coastal waters in the Vestfold Hills region, East Antarctica, and were maintained in the laboratory. Timing of neonate release, brood size and early post-marsupial survival and growth (total length) of juveniles were recorded. Brood size ranged from 26 to 86 neonates per female, and juvenile survival rates were high (96 %). The increase in body length of juveniles ranged from 0.017 to 0.043 mm/day with a mean growth rate of 0.028 mm/day (0.94 % per day) over 11 weeks with strong evidence for exponential growth over time. The body lengths of laboratory-raised juveniles were not significantly different to those of wild-caught juveniles with the same number of segments (15) in the first antennae, indicating that growth may have progressed at a similar rate in vivo and in situ. Juvenile growth was similar when modelled over time or by addition of first antennal segments. This study provides new information on the reproductive biology and early life history of P. walkeri, with further evidence that Antarctic amphipods exhibit slow growth, even when food is not a limiting factor, compared with species from lower latitudes. |
format |
Article in Journal/Newspaper |
author |
Brown, Kathryn E King, Catherine K Harrison, Peter Lynton |
author_facet |
Brown, Kathryn E King, Catherine K Harrison, Peter Lynton |
author_sort |
Brown, Kathryn E |
title |
Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
title_short |
Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
title_full |
Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
title_fullStr |
Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
title_full_unstemmed |
Reproduction, growth and early life history of the Antarctic gammarid amphipod Paramoera walkeri |
title_sort |
reproduction, growth and early life history of the antarctic gammarid amphipod paramoera walkeri |
publisher |
ePublications@SCU |
publishDate |
2015 |
url |
https://epubs.scu.edu.au/esm_pubs/2628 https://doi.org/10.1007/s00300-015-1720-1 |
geographic |
Antarctic East Antarctica The Antarctic Vestfold Vestfold Hills |
geographic_facet |
Antarctic East Antarctica The Antarctic Vestfold Vestfold Hills |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_source |
School of Environment, Science and Engineering Papers |
op_doi |
https://doi.org/10.1007/s00300-015-1720-1 |
container_title |
Polar Biology |
container_volume |
38 |
container_issue |
10 |
container_start_page |
1583 |
op_container_end_page |
1596 |
_version_ |
1766247245582172160 |