Blue whales off the Southern coast of Sri Lanka during the Southwest Monsoon Season

Observations of 37 individual blue whales (Balaenoptera musculus) were recorded off the southern coast of Sri Lanka during the Southwest Monsoon Season (SWM). Sightings were made during a scientific geophysical survey campaign conducted in July and August 2017. Whilst blue whales are regularly recor...

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Vydáno v:The journal of cetacean research and management Ročník 21; číslo 1; s. 1 - 7
Hlavní autoři: Russell, Grace, Bridge, Marcus, Nimak-Wood, Maja
Médium: Journal Article
Jazyk:angličtina
Vydáno: Cambridge International Whaling Commission 10.09.2020
Témata:
Aquatic mammals
Breeding
Cetacea
Continental slope
Geophysical surveys
Latitude
Marine mammals
Monsoons
Ocean circulation
Overwintering
Polls & surveys
Seasons
Surveying
Upwelling
Whales
Wind
Sri Lanka
ISSN:1561-0713, 2312-2706, 2312-2692
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Abstract Observations of 37 individual blue whales (Balaenoptera musculus) were recorded off the southern coast of Sri Lanka during the Southwest Monsoon Season (SWM). Sightings were made during a scientific geophysical survey campaign conducted in July and August 2017. Whilst blue whales are regularly recorded on the continental slope of southern Sri Lanka during the Northeast Monsoon Season (NEM) (December - March) and during the two inter-monsoonal periods (March - April and September - October), limited data is available for the SWM (May - September) mostly due to unfavourable weather conditions and very little survey effort. In the northern hemisphere blue whales undertake seasonal migrations from higher latitude feeding grounds to lower latitude breeding and wintering areas. However it has been suggested that a population of blue whales in the Northern India Ocean (NIO) remains in lower latitudes year round taking advantage of the rich upwelling areas off Somalia, southwest Arabia and western Sri Lanka. Data from this study nevertheless support a theory that a certain number of individuals remain off the southern coast off Sri Lanka during the SWM, suggesting that the productivity in this region is sufficient to support their year-round presence. This study therefore fills a knowledge gap regarding the presence and movement of blue whales in the NIO highlighting the importance of data obtained from platforms of opportunity.
AbstractList Observations of 37 individual blue whales were recorded off the southern coast of Sri Lanka during the southwest monsoon season. Sightings were made during a scientific geophysical survey campaign conducted in July and August 2017. Whilst blue whales are regularly recorded on the continental slope of southern Sri Lanka during the northeast monsoon season (NEM) (December–March) and during the two inter-monsoonal periods (March–April and September–October), limited data are available for the SWM (May–September) mostly due to unfavourable weather conditions and a lack of survey effort. In the Northern Hemisphere, blue whales generally undertake seasonal migrations from higher latitude feeding grounds to lower latitude breeding and wintering areas. However, it has been suggested that a population of blue whales in the northern Indian Ocean (NIO) remains in lower latitudes year-round, taking advantage of the rich upwelling areas off Somalia, southwest Arabia and western Sri Lanka. Data from this study support a hypothesis that a certain number of individuals remain off the southern coast of Sri Lanka during the SWM, suggesting that the productivity in this region is sufficient to support their year-round presence. This study fills a knowledge gap on the presence and movement of blue whales in the NIO, highlighting the importance of data that can be obtained from platforms of opportunity.
Observations of 37 individual blue whales (Balaenoptera musculus) were recorded off the southern coast of Sri Lanka during the Southwest Monsoon Season (SWM). Sightings were made during a scientific geophysical survey campaign conducted in July and August 2017. Whilst blue whales are regularly recorded on the continental slope of southern Sri Lanka during the Northeast Monsoon Season (NEM) (December - March) and during the two inter-monsoonal periods (March - April and September - October), limited data is available for the SWM (May - September) mostly due to unfavourable weather conditions and very little survey effort. In the northern hemisphere blue whales undertake seasonal migrations from higher latitude feeding grounds to lower latitude breeding and wintering areas. However it has been suggested that a population of blue whales in the Northern India Ocean (NIO) remains in lower latitudes year round taking advantage of the rich upwelling areas off Somalia, southwest Arabia and western Sri Lanka. Data from this study nevertheless support a theory that a certain number of individuals remain off the southern coast off Sri Lanka during the SWM, suggesting that the productivity in this region is sufficient to support their year-round presence. This study therefore fills a knowledge gap regarding the presence and movement of blue whales in the NIO highlighting the importance of data obtained from platforms of opportunity.
Author Bridge, Marcus
Russell, Grace
Nimak-Wood, Maja
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Snippet Observations of 37 individual blue whales (Balaenoptera musculus) were recorded off the southern coast of Sri Lanka during the Southwest Monsoon Season (SWM)....
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SubjectTerms Aquatic mammals
Breeding
Cetacea
Continental slope
Geophysical surveys
Latitude
Marine mammals
Monsoons
Ocean circulation
Overwintering
Polls & surveys
Seasons
Surveying
Upwelling
Whales
Wind
Title Blue whales off the Southern coast of Sri Lanka during the Southwest Monsoon Season
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