scholarly journals Distribution and abundance of beaked whales (Family Ziphiidae) Off Cape Hatteras, North Carolina, U.S.A.

2018 ◽  
Vol 34 (4) ◽  
pp. 997-1017 ◽  
Author(s):  
William A. McLellan ◽  
Ryan J. McAlarney ◽  
Erin W. Cummings ◽  
Andrew J. Read ◽  
Charles G. M. Paxton ◽  
...  
Keyword(s):  
North Carolina ◽  
Cape Hatteras ◽  
Beaked Whales

scholarly journals Diving behaviour of Cuvier's beaked whales ( Ziphius cavirostris ) off Cape Hatteras, North Carolina

2019 ◽  
Vol 6 (2) ◽  
pp. 181728 ◽  
Author(s):  
Jeanne M. Shearer ◽  
Nicola J. Quick ◽  
William R. Cioffi ◽  
Robin W. Baird ◽  
Daniel L. Webster ◽  
...  
Keyword(s):  
North Carolina ◽  
Median Duration ◽  
Regional Differences ◽  
Dive Depth ◽  
Diving Behaviour ◽  
Deep Diving ◽  
Cape Hatteras ◽  
Extended Surface ◽  
Beaked Whales ◽  
Behaviour Data

Cuvier's beaked whales exhibit exceptionally long and deep foraging dives. The species is little studied due to their deep-water, offshore distribution and limited time spent at the surface. We used LIMPET satellite tags to study the diving behaviour of Cuvier's beaked whales off Cape Hatteras, North Carolina from 2014 to 2016. We deployed 11 tags, recording 3242 h of behaviour data, encompassing 5926 dives. Dive types were highly bimodal; deep dives (greater than 800 m, n = 1408) had a median depth of 1456 m and median duration of 58.9 min; shallow dives (50–800 m, n = 4518) were to median depths of 280 m with a median duration of 18.7 min. Most surface intervals were very short (median 2.2 min), but all animals occasionally performed extended surface intervals. We found no diel differences in dive depth or the percentage of time spent deep diving, but whales spent significantly more time near the surface at night. Other populations of this species exhibit similar dive patterns, but with regional differences in depth, duration and inter-dive intervals. Satellite-linked tags allow for the collection of long periods of dive records, including the occurrence of anomalous behaviours, bringing new insights into the lives of these deep divers.

scholarly journals Effects of a scientific echo sounder on the behavior of short-finned pilot whales (Globicephala macrorhynchus)

2017 ◽  
Vol 74 (5) ◽  
pp. 716-726 ◽  
Author(s):  
Nicola Quick ◽  
Lindesay Scott-Hayward ◽  
Dina Sadykova ◽  
Doug Nowacek ◽  
Andrew Read
Keyword(s):  
North Carolina ◽  
Generalized Estimating Equations ◽  
Marine Mammals ◽  
Hidden Markov ◽  
Experimental Conditions ◽  
Cape Hatteras ◽  
Consistent Increase ◽  
Pilot Whales ◽  
Acoustic Recording ◽  
Echo Sounder

Active echo sounding devices are often employed for commercial or scientific purposes in the foraging habitats of marine mammals. We conducted an experiment off Cape Hatteras, North Carolina, USA, to assess whether the behavior of short-finned pilot whales (Globicephala macrorhynchus) changed when exposed to an EK60 scientific echo sounder. We attached digital acoustic recording tags (DTAGs) to nine individuals, five of which were exposed. A hidden Markov model to characterize diving states with and without exposure provided no evidence for a change in foraging behavior. However, generalized estimating equations to model changes in heading variance over the entire tag record under all experimental conditions showed a consistent increase in heading variance during exposure over all values of depth and pitch. This suggests that regardless of behavioral state, the whales changed their heading more frequently when the echo sounder was active. This response could represent increased vigilance in which whales maintained awareness of echo sounder location by increasing their heading variance and provides the first quantitative analysis on reactions of cetaceans to a scientific echo sounder.

Primary production on the continental shelf off Cape Hatteras, North Carolina

2002 ◽  
Vol 49 (20) ◽  
pp. 4479-4509 ◽  
Author(s):  
Steven E. Lohrenz ◽  
Donald G. Redalje ◽  
Peter G. Verity ◽  
Charles N. Flagg ◽  
Kenneth V. Matulewski
Keyword(s):  
North Carolina ◽  
Primary Production ◽  
Continental Shelf ◽  
Cape Hatteras
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