NDLI: Avoidance of mussel farms by dusky dolphins (Lagenorhynchus obscurus) in New Zealand

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Avoidance of mussel farms by dusky dolphins (Lagenorhynchus obscurus) in New Zealand

Content Provider	Scilit
Author	Pearson, Hc Vaughn-Hirshorn, Rl Srinivasan, M. Würsig, B.
Copyright Year	2012
Description	Journal: New Zealand Journal of Marine and Freshwater Research We describe fine-scale interactions between dusky dolphins and mussel farms in Admiralty Bay, New Zealand. We examined dusky dolphin presence in nearshore mussel farms, coordinated feeding behaviours in and near mussel farms, and long-term changes in regional population abundance. Sampling methods included boat-based surveys, focal follows, underwater observations, and photo-identification. Correcting for area, dusky dolphins spent significantly less time inside mussel farms versus outside mussel farms and other nearshore areas (both P<0.001). Prey balls entered or moved adjacent to mussel farms during 2/52 feeding bouts, after which dusky dolphin feeding behaviour ceased. Total estimated abundance during winter 2005–2006 was 712 (95% CI: 511–1134) with a declining trend in annual abundance after 2003. Results suggest that: (1) dusky dolphins rarely use mussel farms; (2) mussel farms may hinder coordinated feeding strategies; and (3) the number of dusky dolphins using this foraging habitat varies between years and may be declining.
Related Links	https://www.tandfonline.com/doi/pdf/10.1080/00288330.2012.712977?needAccess=true
Ending Page	574
Page Count	8
Starting Page	567
ISSN	00288330
e-ISSN	11758805
DOI	10.1080/00288330.2012.712977
Journal	New Zealand Journal of Marine and Freshwater Research
Issue Number	4
Volume Number	46
Language	English
Publisher	Informa UK Limited
Publisher Date	2012-09-12
Access Restriction	Open
Subject Keyword	Journal: New Zealand Journal of Marine and Freshwater Research Marine and Freshwater Biology Conservation Dusky Dolphin Lagenorhynchus Obscurus
Content Type	Text
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics Water Science and Technology

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