Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence
Grey seals have been implicated in the continued decline of Atlantic cod in the southern Gulf of St. Lawrence. Experts were surveyed to identify plausible ecological hypotheses about the effect of seals on cod. Three interaction hypotheses ranked highly by experts (i.e. Aggregation, Belly-Biting, an...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Thesis |
Language: | English |
Published: |
University of Guelph
2010
|
Subjects: | |
Online Access: | https://hdl.handle.net/10214/20236 |
id |
ftunivguelph:oai:atrium.lib.uoguelph.ca:10214/20236 |
---|---|
record_format |
openpolar |
spelling |
ftunivguelph:oai:atrium.lib.uoguelph.ca:10214/20236 2023-11-05T03:40:22+01:00 Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence Caskenette, Amanda Lynn Crawford, S.S. McCann, K.S. 2010 application/pdf https://hdl.handle.net/10214/20236 en eng University of Guelph https://hdl.handle.net/10214/20236 All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated. Gulf of St. Lawrence Grey seals Atlantic cod Decline Mathematical models Thesis 2010 ftunivguelph 2023-10-08T06:10:48Z Grey seals have been implicated in the continued decline of Atlantic cod in the southern Gulf of St. Lawrence. Experts were surveyed to identify plausible ecological hypotheses about the effect of seals on cod. Three interaction hypotheses ranked highly by experts (i.e. Aggregation, Belly-Biting, and Foraging Restriction) were translated into mathematical models and combined with a cod population base model. Ability of each model to explain changes in relative cod abundance was evaluated. The 'Belly-Biting Hypothesis ' was highly ranked by model selection, however, none of the three selected hypotheses or combinations of hypotheses accounted for most of the variation observed in cod-seal interactions. Managers and researchers should continue to quantitatively evaluate other ecological hypotheses of cod population dynamics in a statistically defensible manner. Thesis atlantic cod Gadus morhua University of Guelph: DSpace digital archive |
institution |
Open Polar |
collection |
University of Guelph: DSpace digital archive |
op_collection_id |
ftunivguelph |
language |
English |
topic |
Gulf of St. Lawrence Grey seals Atlantic cod Decline Mathematical models |
spellingShingle |
Gulf of St. Lawrence Grey seals Atlantic cod Decline Mathematical models Caskenette, Amanda Lynn Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
topic_facet |
Gulf of St. Lawrence Grey seals Atlantic cod Decline Mathematical models |
description |
Grey seals have been implicated in the continued decline of Atlantic cod in the southern Gulf of St. Lawrence. Experts were surveyed to identify plausible ecological hypotheses about the effect of seals on cod. Three interaction hypotheses ranked highly by experts (i.e. Aggregation, Belly-Biting, and Foraging Restriction) were translated into mathematical models and combined with a cod population base model. Ability of each model to explain changes in relative cod abundance was evaluated. The 'Belly-Biting Hypothesis ' was highly ranked by model selection, however, none of the three selected hypotheses or combinations of hypotheses accounted for most of the variation observed in cod-seal interactions. Managers and researchers should continue to quantitatively evaluate other ecological hypotheses of cod population dynamics in a statistically defensible manner. |
author2 |
Crawford, S.S. McCann, K.S. |
format |
Thesis |
author |
Caskenette, Amanda Lynn |
author_facet |
Caskenette, Amanda Lynn |
author_sort |
Caskenette, Amanda Lynn |
title |
Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
title_short |
Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
title_full |
Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
title_fullStr |
Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
title_full_unstemmed |
Effects of grey seals (Halichoerus grypus) on Atlantic cod (Gadus morhua) in the southern Gulf of St. Lawrence |
title_sort |
effects of grey seals (halichoerus grypus) on atlantic cod (gadus morhua) in the southern gulf of st. lawrence |
publisher |
University of Guelph |
publishDate |
2010 |
url |
https://hdl.handle.net/10214/20236 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
https://hdl.handle.net/10214/20236 |
op_rights |
All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1781696394166272000 |