id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_wurjsm4bxbhc3nrgqsajdm56he	Meike Scheidat	Cetacean surveys in the Southern Ocean using icebreaker-supported helicopters	2011.0	10	.pdf	application/pdf	6803	579	65	Helicopter surveys allow the collection of additional information on sightings, (e.g. group size, Alternatively, aerial surveys using ship-based helicopters could allow information to be obtained on cetacean and pack ice zones (Southwell 2005), but very few surveys have included cetaceans as target species (Plötz line-transect surveys of cetaceans in Antarctic waters; (2) of diVerent cetacean species with respect to sea ice. whale presence and sea ice conditions, we ran a classiWcation and regression tree (CART) analysis. between baleen whale sightings with proximity to the marginal ice edge and the total concentration of sea ice where Fig. 3 CART diagram showing the relationships between three cetacean species and sea ice. ice cover in the Weddell Sea. In our current study, we demonstrate a horizontal separation of minke from other baleen whales with respect to Helicopter surveys and whale sightings Helicopter surveys and whale sightings Whale sightings in relation to ice conditions Whale sightings in relation to ice conditions	./cache/work_wurjsm4bxbhc3nrgqsajdm56he.pdf	./txt/work_wurjsm4bxbhc3nrgqsajdm56he.txt