Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland
This study examines spatial and temporal variability in distribution of Atlantic cod (Gadus morhua L.) eggs and larvae in Placentia Bay, Newfoundland, from three directions. The first chapter reviews the literature regarding the roles of transport and behavior in planktonic egg and larval pattern fo...
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
Memorial University of Newfoundland
2000
|
Subjects: | |
Online Access: | https://research.library.mun.ca/780/ https://research.library.mun.ca/780/1/Bradbury_IanR.pdf https://research.library.mun.ca/780/3/Bradbury_IanR.pdf |
id |
ftmemorialuniv:oai:research.library.mun.ca:780 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialuniv:oai:research.library.mun.ca:780 2023-10-01T03:54:31+02:00 Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland Bradbury, Ian R. 2000 application/pdf https://research.library.mun.ca/780/ https://research.library.mun.ca/780/1/Bradbury_IanR.pdf https://research.library.mun.ca/780/3/Bradbury_IanR.pdf en eng Memorial University of Newfoundland https://research.library.mun.ca/780/1/Bradbury_IanR.pdf https://research.library.mun.ca/780/3/Bradbury_IanR.pdf Bradbury, Ian R. <https://research.library.mun.ca/view/creator_az/Bradbury=3AIan_R=2E=3A=3A.html> (2000) Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland. Masters thesis, Memorial University of Newfoundland. thesis_license Thesis NonPeerReviewed 2000 ftmemorialuniv 2023-09-03T06:44:03Z This study examines spatial and temporal variability in distribution of Atlantic cod (Gadus morhua L.) eggs and larvae in Placentia Bay, Newfoundland, from three directions. The first chapter reviews the literature regarding the roles of transport and behavior in planktonic egg and larval pattern for benthic marine invertebrates and fish. This review suggests that the processes affecting each group are very similar, acknowledging that differences may be found in the capacity to contribute actively to dispersal and habitat selection. The second chapter provides evidence that variation in location and timing of spawning of Atlantic cod has a major impact on occurrence, distribution and development of eggs and larvae in Placentia Bay. Repeated ichthyoplankton surveys of the bay during the spawning and post-spawning periods indicate that eggs spawned early in the year (March - May) are lost from the bay. By contrast, elevated egg production late in summer of 1998 (July) resulted in a dramatic increase in larval densities. The third chapter combines modeling and field examination of the relationships between mortality, transport, and temperature during the egg stage, and demonstrates that consistent transport out of the bay may limit numbers hatching within the bay. Thus, the appearance of larvae is confined to summer months when development times are shortest. This thesis demonstrates the importance of cod spawning timing and location, as well as temperature and hydrographic influences on the transport and development of planktonic eggs and larvae in coastal Newfoundland. Thesis atlantic cod Gadus morhua Newfoundland Memorial University of Newfoundland: Research Repository |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Research Repository |
op_collection_id |
ftmemorialuniv |
language |
English |
description |
This study examines spatial and temporal variability in distribution of Atlantic cod (Gadus morhua L.) eggs and larvae in Placentia Bay, Newfoundland, from three directions. The first chapter reviews the literature regarding the roles of transport and behavior in planktonic egg and larval pattern for benthic marine invertebrates and fish. This review suggests that the processes affecting each group are very similar, acknowledging that differences may be found in the capacity to contribute actively to dispersal and habitat selection. The second chapter provides evidence that variation in location and timing of spawning of Atlantic cod has a major impact on occurrence, distribution and development of eggs and larvae in Placentia Bay. Repeated ichthyoplankton surveys of the bay during the spawning and post-spawning periods indicate that eggs spawned early in the year (March - May) are lost from the bay. By contrast, elevated egg production late in summer of 1998 (July) resulted in a dramatic increase in larval densities. The third chapter combines modeling and field examination of the relationships between mortality, transport, and temperature during the egg stage, and demonstrates that consistent transport out of the bay may limit numbers hatching within the bay. Thus, the appearance of larvae is confined to summer months when development times are shortest. This thesis demonstrates the importance of cod spawning timing and location, as well as temperature and hydrographic influences on the transport and development of planktonic eggs and larvae in coastal Newfoundland. |
format |
Thesis |
author |
Bradbury, Ian R. |
spellingShingle |
Bradbury, Ian R. Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
author_facet |
Bradbury, Ian R. |
author_sort |
Bradbury, Ian R. |
title |
Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
title_short |
Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
title_full |
Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
title_fullStr |
Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
title_full_unstemmed |
Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland |
title_sort |
environmental influences on the distribution and transport of atlantic cod, gadus morhua, eggs and larvae in coastal newfoundland |
publisher |
Memorial University of Newfoundland |
publishDate |
2000 |
url |
https://research.library.mun.ca/780/ https://research.library.mun.ca/780/1/Bradbury_IanR.pdf https://research.library.mun.ca/780/3/Bradbury_IanR.pdf |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_relation |
https://research.library.mun.ca/780/1/Bradbury_IanR.pdf https://research.library.mun.ca/780/3/Bradbury_IanR.pdf Bradbury, Ian R. <https://research.library.mun.ca/view/creator_az/Bradbury=3AIan_R=2E=3A=3A.html> (2000) Environmental influences on the distribution and transport of Atlantic cod, Gadus morhua, eggs and larvae in coastal Newfoundland. Masters thesis, Memorial University of Newfoundland. |
op_rights |
thesis_license |
_version_ |
1778522259308150784 |