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Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia

This study examined the stomach contents of seven Indo-Pacific finless porpoises (Neophocaena phocaenoides), two Irrawaddy dolphins (Orcaella brevirostris), and one Indo-Pacific humpback dolphin (Sousa chinensis) retrieved from stranding and bycatch events along the Sarawak coastline. From these s...

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Main Authors: Ernadia Elsie Jaya, Lawrence, Cindy, Peter, Gianna, Minton, Jongkar, Grinang, melvin terry, gumal, Anna Norliza, Zulkifli Poh, Vivian, Soon, Amanda, Wilson, James, Bali, Samantha, Ambie, Dayang Nuriza, Abang Abdillah, Ian Levi, Jackery, Sandy Choo, Ling, Andrew Alek, Tuen
Format: Article
Language:English
Published: Elsevier Science, Ltd. 2025
Subjects:
QL Zoology
Online Access:http://ir.unimas.my/id/eprint/46969/1/Lawrence%20et%20al.%2C%202025%20-%20Pages%201%20and%209.pdf
http://ir.unimas.my/id/eprint/46969/
https://www.sciencedirect.com/science/article/pii/S0964569124005076
https://doi.org/10.1016/j.ocecoaman.2024.107522
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spelling my.unimas.ir-469692024-12-20T08:01:20Z http://ir.unimas.my/id/eprint/46969/ Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia Ernadia Elsie Jaya, Lawrence Cindy, Peter Gianna, Minton Jongkar, Grinang melvin terry, gumal Anna Norliza, Zulkifli Poh Vivian, Soon Amanda, Wilson James, Bali Samantha, Ambie Dayang Nuriza, Abang Abdillah Ian Levi, Jackery Sandy Choo, Ling Andrew Alek, Tuen QL Zoology This study examined the stomach contents of seven Indo-Pacific finless porpoises (Neophocaena phocaenoides), two Irrawaddy dolphins (Orcaella brevirostris), and one Indo-Pacific humpback dolphin (Sousa chinensis) retrieved from stranding and bycatch events along the Sarawak coastline. From these stomach contents, 170 fish, 150 cephalopod, and six crustacean loose prey items were found, representing 23 prey species from 18 families. Prey item importance was assessed using the percentage by number and percentage by frequency of occurrence methods as well as a modified index of relative importance. The diet of finless porpoises comprised 64% cephalopods, 33% fish and 3% crustaceans. The prey items found in Irrawaddy dolphins stomachs comprised 99% fish and 1% cephalopods. All three cetacean species were found to feed on fish across a wide range of trophic levels. Finless porpoises and Irrawaddy dolphins shared the most numerically important fish family, the Engraulidae (anchovies). Meanwhile, the Ariidae (catfish) family was the most numerically important fish family for the humpback dolphin. A few prey species found in the stomach contents (i.e. anchovies, drums or croakers, marine catfish and false trevally) are commercially important fish species in Sarawak. This overlap, coupled with previous studies that demonstrate co-occurrence of cetacean hotspots and artisanal and commercial fishing effort, suggests a high likelihood of cetacean-fisheries interactions and elevated risk of cetacean entanglement and mortality. This is a serious concern, as humpback dolphins and finless porpoises are considered Vulnerable and Irrawaddy dolphins Endangered on the IUCN Red List of Threatened Species. All dolphins and finless porpoises are also listed as Totally Protected in Sarawak’s Wild Life Protection Ordinance (1998). Elsevier Science, Ltd. 2025 Article PeerReviewed text en http://ir.unimas.my/id/eprint/46969/1/Lawrence%20et%20al.%2C%202025%20-%20Pages%201%20and%209.pdf Ernadia Elsie Jaya, Lawrence and Cindy, Peter and Gianna, Minton and Jongkar, Grinang and melvin terry, gumal and Anna Norliza, Zulkifli Poh and Vivian, Soon and Amanda, Wilson and James, Bali and Samantha, Ambie and Dayang Nuriza, Abang Abdillah and Ian Levi, Jackery and Sandy Choo, Ling and Andrew Alek, Tuen (2025) Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia. Ocean and Coastal Management, 261 (107522). pp. 1-11. ISSN 0964-5691 https://www.sciencedirect.com/science/article/pii/S0964569124005076 https://doi.org/10.1016/j.ocecoaman.2024.107522
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic QL Zoology
spellingShingle QL Zoology
Ernadia Elsie Jaya, Lawrence
Cindy, Peter
Gianna, Minton
Jongkar, Grinang
melvin terry, gumal
Anna Norliza, Zulkifli Poh
Vivian, Soon
Amanda, Wilson
James, Bali
Samantha, Ambie
Dayang Nuriza, Abang Abdillah
Ian Levi, Jackery
Sandy Choo, Ling
Andrew Alek, Tuen
Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
description This study examined the stomach contents of seven Indo-Pacific finless porpoises (Neophocaena phocaenoides), two Irrawaddy dolphins (Orcaella brevirostris), and one Indo-Pacific humpback dolphin (Sousa chinensis) retrieved from stranding and bycatch events along the Sarawak coastline. From these stomach contents, 170 fish, 150 cephalopod, and six crustacean loose prey items were found, representing 23 prey species from 18 families. Prey item importance was assessed using the percentage by number and percentage by frequency of occurrence methods as well as a modified index of relative importance. The diet of finless porpoises comprised 64% cephalopods, 33% fish and 3% crustaceans. The prey items found in Irrawaddy dolphins stomachs comprised 99% fish and 1% cephalopods. All three cetacean species were found to feed on fish across a wide range of trophic levels. Finless porpoises and Irrawaddy dolphins shared the most numerically important fish family, the Engraulidae (anchovies). Meanwhile, the Ariidae (catfish) family was the most numerically important fish family for the humpback dolphin. A few prey species found in the stomach contents (i.e. anchovies, drums or croakers, marine catfish and false trevally) are commercially important fish species in Sarawak. This overlap, coupled with previous studies that demonstrate co-occurrence of cetacean hotspots and artisanal and commercial fishing effort, suggests a high likelihood of cetacean-fisheries interactions and elevated risk of cetacean entanglement and mortality. This is a serious concern, as humpback dolphins and finless porpoises are considered Vulnerable and Irrawaddy dolphins Endangered on the IUCN Red List of Threatened Species. All dolphins and finless porpoises are also listed as Totally Protected in Sarawak’s Wild Life Protection Ordinance (1998).
format Article
author Ernadia Elsie Jaya, Lawrence
Cindy, Peter
Gianna, Minton
Jongkar, Grinang
melvin terry, gumal
Anna Norliza, Zulkifli Poh
Vivian, Soon
Amanda, Wilson
James, Bali
Samantha, Ambie
Dayang Nuriza, Abang Abdillah
Ian Levi, Jackery
Sandy Choo, Ling
Andrew Alek, Tuen
author_facet Ernadia Elsie Jaya, Lawrence
Cindy, Peter
Gianna, Minton
Jongkar, Grinang
melvin terry, gumal
Anna Norliza, Zulkifli Poh
Vivian, Soon
Amanda, Wilson
James, Bali
Samantha, Ambie
Dayang Nuriza, Abang Abdillah
Ian Levi, Jackery
Sandy Choo, Ling
Andrew Alek, Tuen
author_sort Ernadia Elsie Jaya, Lawrence
title Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
title_short Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
title_full Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
title_fullStr Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
title_full_unstemmed Stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in Sarawak, Malaysia
title_sort stomach content analysis reveals insights into the feeding ecology of coastal cetaceans in sarawak, malaysia
publisher Elsevier Science, Ltd.
publishDate 2025
url http://ir.unimas.my/id/eprint/46969/1/Lawrence%20et%20al.%2C%202025%20-%20Pages%201%20and%209.pdf
http://ir.unimas.my/id/eprint/46969/
https://www.sciencedirect.com/science/article/pii/S0964569124005076
https://doi.org/10.1016/j.ocecoaman.2024.107522
_version_ 1819914974094426112
score 13.223943

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