Prey decline leads to diet shift in the largest population of Indo‐Pacific humpback dolphins? | |
LIN, Wenzhi1,4,5; KARCZMARSKI, Leszek1,3; ZHOU, Ruilian5; MO, Yaqian5; GUO, Lang5; YIU, Sam King Fung2; NING, Xi5; WAI, Tak-Cheung2; WU, Yuping5 | |
刊名 | Integrative Zoology |
2021-07 | |
卷号 | 16期号:4页码:548 - 574 |
关键词 | feeding ecology Pearl River Delta prey decline Sousa chinensis stomach content analysis |
DOI | 10.1111/1749-4877.12548 |
通讯作者 | LIN, Wenzhi ; KARCZMARSKI, Leszek |
英文摘要 | The Pearl River Delta (PRD) region on the southeast coast of China has long been known as a highly productive fishing ground. Since the late 1980s, fishing pressure in the PRD has been intense, which warrants concerns of potential fishery-related impacts on the food resources and foraging ecology of apex marine predators in this region, such as the Indo-Pacific humpback dolphin (Sousa chinensis). In this study, we examined 54 stomachs with food remains, collected from beached carcasses of humpback dolphins recovered during fifteen years between 2003 and 2017. The 6043 identified prey items represent 62 teleost taxa, primarily small estuarine fish, but also larger reef fish. The dolphins appear to be opportunistic foragers, hunting across the water-column, with preference for shoaling and meaty fishes (e.g. Collichthys lucidus IRI% = 38.6%, Johnius belangerii IRI% = 23.1%, Mugil cephalus IRI% = 14.0%). Our findings suggest a dietary shift in recent years, from primarily demersal (as previously reported) to greater intake of neritic and pelagic fish. Dolphin foraging group size has decreased in recent years, which corresponds with declining size and numbers of prey items retrieved from dolphin stomachs. We suggest that these are indicators of declining food resources. Faced with a shortage of preferred prey, humpback dolphins may have broadened their dietary spectrum to maintain their daily energy intake, while their foraging group size decreased in response to the altered tradeoff between the costs and benefits of group foraging. |
语种 | 英语 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/9051] |
专题 | 深海科学研究部_深海生物学研究室_海洋哺乳动物与海洋生物声学研究组 |
通讯作者 | LIN, Wenzhi; KARCZMARSKI, Leszek |
作者单位 | 1.Division of Cetacean Ecology, Cetacea Research Institute, Lantau, Hong Kong SAR, China 2.State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong SAR, China 3.School of Biological Sciences, University of Hong Kong, Pokfulam, Hong Kong SAR, China 4.Marine Mammal and Marine Bioacoustics Laboratory, Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Sanya, China 5.School of Marine Sciences, Zhuhai Key Laboratory of Marine Bioresources and Environment, Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Southern Marine Science and Engineering Guangdong Laboratory, Sun Yat-Sen University, |
推荐引用方式 GB/T 7714 | LIN, Wenzhi,KARCZMARSKI, Leszek,ZHOU, Ruilian,et al. Prey decline leads to diet shift in the largest population of Indo‐Pacific humpback dolphins?[J]. Integrative Zoology,2021,16(4):548 - 574. |
APA | LIN, Wenzhi.,KARCZMARSKI, Leszek.,ZHOU, Ruilian.,MO, Yaqian.,GUO, Lang.,...&WU, Yuping.(2021).Prey decline leads to diet shift in the largest population of Indo‐Pacific humpback dolphins?.Integrative Zoology,16(4),548 - 574. |
MLA | LIN, Wenzhi,et al."Prey decline leads to diet shift in the largest population of Indo‐Pacific humpback dolphins?".Integrative Zoology 16.4(2021):548 - 574. |
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