Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers
Abstract In 2001, we began long‐term monitoring using scan sampling methodology to study the relative abundance and distribution of humpback whales ( Megaptera novaeangliae ) on their Hawaiian breeding grounds. Samples were collected annually (2001–2019) from a shore site overlooking Kawaihae Bay, H...
Published in: | Marine Mammal Science |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2021
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mms.12856 |
id |
crwiley:10.1111/mms.12856 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/mms.12856 2024-09-30T14:36:19+00:00 Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers Frankel, Adam S. Gabriele, Christine M. Yin, Suzanne Rickards, Susan H. 2021 http://dx.doi.org/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mms.12856 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 38, issue 1, page 118-138 ISSN 0824-0469 1748-7692 journal-article 2021 crwiley https://doi.org/10.1111/mms.12856 2024-09-05T05:05:00Z Abstract In 2001, we began long‐term monitoring using scan sampling methodology to study the relative abundance and distribution of humpback whales ( Megaptera novaeangliae ) on their Hawaiian breeding grounds. Samples were collected annually (2001–2019) from a shore site overlooking Kawaihae Bay, Hawaiʻi Island. Each sample included the number of whales, pod composition, and position. Whale numbers increased from 2001 to 2015, with increasing variability after 2010. Numbers then declined, including a precipitous 60% drop between 2015 and 2016. Crude birth rate fell from 6.5% in 2015 to 1.1% in 2016. We used generalized additive models, including predictor variables of year, date, observational conditions, and observer, to establish a base model. Climatic indices were individually added to base models, and their contributions were evaluated using Akaike information criteria. Models indicated that whale numbers and crude birth rate fell when climate indices reflected warmer water on high latitude feeding grounds in the North Pacific. Our results show that oceanographic conditions during prior feeding seasons correspond with the reproductive rate and the number of whales in Hawaiʻi. Continued long‐term monitoring of whale populations is essential to documenting and understanding marine ecosystem responses to global climate change. Article in Journal/Newspaper Humpback Whale Megaptera novaeangliae Wiley Online Library Pacific Marine Mammal Science |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract In 2001, we began long‐term monitoring using scan sampling methodology to study the relative abundance and distribution of humpback whales ( Megaptera novaeangliae ) on their Hawaiian breeding grounds. Samples were collected annually (2001–2019) from a shore site overlooking Kawaihae Bay, Hawaiʻi Island. Each sample included the number of whales, pod composition, and position. Whale numbers increased from 2001 to 2015, with increasing variability after 2010. Numbers then declined, including a precipitous 60% drop between 2015 and 2016. Crude birth rate fell from 6.5% in 2015 to 1.1% in 2016. We used generalized additive models, including predictor variables of year, date, observational conditions, and observer, to establish a base model. Climatic indices were individually added to base models, and their contributions were evaluated using Akaike information criteria. Models indicated that whale numbers and crude birth rate fell when climate indices reflected warmer water on high latitude feeding grounds in the North Pacific. Our results show that oceanographic conditions during prior feeding seasons correspond with the reproductive rate and the number of whales in Hawaiʻi. Continued long‐term monitoring of whale populations is essential to documenting and understanding marine ecosystem responses to global climate change. |
format |
Article in Journal/Newspaper |
author |
Frankel, Adam S. Gabriele, Christine M. Yin, Suzanne Rickards, Susan H. |
spellingShingle |
Frankel, Adam S. Gabriele, Christine M. Yin, Suzanne Rickards, Susan H. Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
author_facet |
Frankel, Adam S. Gabriele, Christine M. Yin, Suzanne Rickards, Susan H. |
author_sort |
Frankel, Adam S. |
title |
Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
title_short |
Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
title_full |
Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
title_fullStr |
Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
title_full_unstemmed |
Humpback whale abundance in Hawai‘i: Temporal trends and response to climatic drivers |
title_sort |
humpback whale abundance in hawai‘i: temporal trends and response to climatic drivers |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12856 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/mms.12856 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Humpback Whale Megaptera novaeangliae |
genre_facet |
Humpback Whale Megaptera novaeangliae |
op_source |
Marine Mammal Science volume 38, issue 1, page 118-138 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mms.12856 |
container_title |
Marine Mammal Science |
_version_ |
1811639408526360576 |