GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1
A bstract The annual return, seasonal occurrence, and site fidelity of Korean‐Okhotsk or western gray whales on their feeding grounds off northeastern Sakhalin Island, Russia, were assessed by boat‐based photo‐identification studies in 1994‐1998. A total of 262 pods were observed, ranging in size fr...
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crwiley:10.1111/j.1748-7692.1999.tb00886.x 2023-12-03T10:28:33+01:00 GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 Weller, David W. Würsig, Bernd Bradford, Amanda L. Burdin, Alexander M. Blokhin, Sergey A. Minakuchi, Hiroya Brownell, Robert L. 1999 http://dx.doi.org/10.1111/j.1748-7692.1999.tb00886.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1999.tb00886.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1999.tb00886.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 15, issue 4, page 1208-1227 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1999 crwiley https://doi.org/10.1111/j.1748-7692.1999.tb00886.x 2023-11-09T14:28:22Z A bstract The annual return, seasonal occurrence, and site fidelity of Korean‐Okhotsk or western gray whales on their feeding grounds off northeastern Sakhalin Island, Russia, were assessed by boat‐based photo‐identification studies in 1994‐1998. A total of 262 pods were observed, ranging in size from 1 to 9 whales with an overall mean of 2.0. Sixty‐nine whales were individually identified, and a majority of all whales (71.0%) were observed in multiple years. Annual sighting frequencies ranged from 1 to 18 d, with a mean of 5. 4 d. The percentage of whales reidentified from previous years showed a continuous annual increase, reaching 87.0% by the end of the study. Time between first and last sighting of identified individuals within a given year was 1‐85 d, with an overall mean of 40.6 d. Annual calf proportions ranged from 4.3% (1997) to 13.2% (1998), and mother‐calf separations generally occurred between July and September. The seasonal site fidelity and annual return of whales to this part of the Okhotsk Sea emphasize its importance as a primary feeding ground for this endangered population. Article in Journal/Newspaper okhotsk sea Sakhalin Wiley Online Library (via Crossref) Okhotsk Marine Mammal Science 15 4 1208 1227 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Weller, David W. Würsig, Bernd Bradford, Amanda L. Burdin, Alexander M. Blokhin, Sergey A. Minakuchi, Hiroya Brownell, Robert L. GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A bstract The annual return, seasonal occurrence, and site fidelity of Korean‐Okhotsk or western gray whales on their feeding grounds off northeastern Sakhalin Island, Russia, were assessed by boat‐based photo‐identification studies in 1994‐1998. A total of 262 pods were observed, ranging in size from 1 to 9 whales with an overall mean of 2.0. Sixty‐nine whales were individually identified, and a majority of all whales (71.0%) were observed in multiple years. Annual sighting frequencies ranged from 1 to 18 d, with a mean of 5. 4 d. The percentage of whales reidentified from previous years showed a continuous annual increase, reaching 87.0% by the end of the study. Time between first and last sighting of identified individuals within a given year was 1‐85 d, with an overall mean of 40.6 d. Annual calf proportions ranged from 4.3% (1997) to 13.2% (1998), and mother‐calf separations generally occurred between July and September. The seasonal site fidelity and annual return of whales to this part of the Okhotsk Sea emphasize its importance as a primary feeding ground for this endangered population. |
format |
Article in Journal/Newspaper |
author |
Weller, David W. Würsig, Bernd Bradford, Amanda L. Burdin, Alexander M. Blokhin, Sergey A. Minakuchi, Hiroya Brownell, Robert L. |
author_facet |
Weller, David W. Würsig, Bernd Bradford, Amanda L. Burdin, Alexander M. Blokhin, Sergey A. Minakuchi, Hiroya Brownell, Robert L. |
author_sort |
Weller, David W. |
title |
GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
title_short |
GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
title_full |
GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
title_fullStr |
GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
title_full_unstemmed |
GRAY WHALES ( ESCHRICHTIUS ROBUSTUS ) OFF SAKHALIN ISLAND, RUSSIA: SEASONAL AND ANNUAL PATTERNS OF OCCURRENCE 1 |
title_sort |
gray whales ( eschrichtius robustus ) off sakhalin island, russia: seasonal and annual patterns of occurrence 1 |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.1111/j.1748-7692.1999.tb00886.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.1999.tb00886.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.1999.tb00886.x |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea Sakhalin |
genre_facet |
okhotsk sea Sakhalin |
op_source |
Marine Mammal Science volume 15, issue 4, page 1208-1227 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.1999.tb00886.x |
container_title |
Marine Mammal Science |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1208 |
op_container_end_page |
1227 |
_version_ |
1784253283400941568 |