Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua)
Settlement and growth of age 0+ cod were monitored using snorkel and self-contained underwater breathing apparatus (SCUBA) in four distinct habitat types (sand, seagrass, cobble, and rock reef) in St. Margaret's Bay, Nova Scotia. Newly settled cod were marked with acrylic dye, allowing repeated...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
1995
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f95-176 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-176 |
id |
crcansciencepubl:10.1139/f95-176 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f95-176 2024-05-19T07:37:05+00:00 Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) Tupper, M. Boutilier, R. G. 1995 http://dx.doi.org/10.1139/f95-176 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-176 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 9, page 1834-1841 ISSN 0706-652X 1205-7533 journal-article 1995 crcansciencepubl https://doi.org/10.1139/f95-176 2024-04-25T06:52:00Z Settlement and growth of age 0+ cod were monitored using snorkel and self-contained underwater breathing apparatus (SCUBA) in four distinct habitat types (sand, seagrass, cobble, and rock reef) in St. Margaret's Bay, Nova Scotia. Newly settled cod were marked with acrylic dye, allowing repeated visual length estimates of individual fish. Settlement of cod did not differ between habitat types, but postsettlement survival and subsequent juvenile densities were higher in more structurally complex habitats. These differences appear to be due to increased shelter availability and decreased predator efficiency in structurally complex habitats. Growth rate was highest in seagrass beds, while the efficiency of cod predators was lowest and cod survival was highest on rocky reefs and cobble bottoms. Thus, trade-offs occur between energy gain and predation risk. In St. Margaret's Bay, the population structure of Atlantic cod may be less influenced by patterns of larval supply than by postsettlement processes such as habitat-specific growth and mortality. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 52 9 1834 1841 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Settlement and growth of age 0+ cod were monitored using snorkel and self-contained underwater breathing apparatus (SCUBA) in four distinct habitat types (sand, seagrass, cobble, and rock reef) in St. Margaret's Bay, Nova Scotia. Newly settled cod were marked with acrylic dye, allowing repeated visual length estimates of individual fish. Settlement of cod did not differ between habitat types, but postsettlement survival and subsequent juvenile densities were higher in more structurally complex habitats. These differences appear to be due to increased shelter availability and decreased predator efficiency in structurally complex habitats. Growth rate was highest in seagrass beds, while the efficiency of cod predators was lowest and cod survival was highest on rocky reefs and cobble bottoms. Thus, trade-offs occur between energy gain and predation risk. In St. Margaret's Bay, the population structure of Atlantic cod may be less influenced by patterns of larval supply than by postsettlement processes such as habitat-specific growth and mortality. |
format |
Article in Journal/Newspaper |
author |
Tupper, M. Boutilier, R. G. |
spellingShingle |
Tupper, M. Boutilier, R. G. Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
author_facet |
Tupper, M. Boutilier, R. G. |
author_sort |
Tupper, M. |
title |
Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
title_short |
Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
title_full |
Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
title_fullStr |
Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
title_full_unstemmed |
Effects of habitat on settlement, growth, and postsettlement survival of Atlantic cod ( Gadus morhua) |
title_sort |
effects of habitat on settlement, growth, and postsettlement survival of atlantic cod ( gadus morhua) |
publisher |
Canadian Science Publishing |
publishDate |
1995 |
url |
http://dx.doi.org/10.1139/f95-176 http://www.nrcresearchpress.com/doi/pdf/10.1139/f95-176 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 52, issue 9, page 1834-1841 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f95-176 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
52 |
container_issue |
9 |
container_start_page |
1834 |
op_container_end_page |
1841 |
_version_ |
1799476323544989696 |