Hydrodynamic sensory threshold in harbour seals (Phoca vitulina) for artificial flatfish breathing currents
نویسندگان
چکیده
منابع مشابه
Tracking of biogenic hydrodynamic trails in harbour seals (Phoca vitulina).
For seals hunting in dark and murky waters one source of sensory information for locating prey consists of fish-generated water movements, which they can detect using their highly sensitive mystacial vibrissae. As water movements in the wake of fishes can persist for several minutes, hydrodynamic trails of considerable length are generated. It has been demonstrated that seals can use their vibr...
متن کاملEarlier pupping in harbour seals, Phoca vitulina.
The annual reproductive cycle of most seal species is characterized by a tight synchrony of births. Typically, timing of birth shows little inter-annual variation. Here, however we show that harbour seals Phoca vitulina from the Wadden Sea (southeast North Sea) have shortened their yearly cycle, moving parturition to earlier dates since the early 1970s. Between 1974 and 2009, the birth date of ...
متن کاملDiving heart rate development in postnatal harbour seals, Phoca vitulina.
Harbour seals, Phoca vitulina, dive from birth, providing a means of mapping the development of the diving response, and so our objective was to investigate the postpartum development of diving bradycardia. The study was conducted May-July 2000 and 2001 in the St. Lawrence River Estuary (48 degrees 41'N, 68 degrees 01'W). Both depth and heart rate (HR) were remotely recorded during 86,931 dives...
متن کاملThe impact of glide phases on the trackability of hydrodynamic trails in harbour seals (Phoca vitulina).
The mystacial vibrissae of harbour seals (Phoca vitulina) constitute a highly sensitive hydrodynamic receptor system enabling the seals to detect and follow hydrodynamic trails. In the wild, hydrodynamic trails, as generated by swimming fish, consist of cyclic burst-and-glide phases, associated with various differences in the physical parameters of the trail. Here, we investigated the impact of...
متن کاملPlastic ingestion by harbour seals (Phoca vitulina) in The Netherlands.
Abundance of ingested debris by seals has been mentioned as a potential indicator of marine litter in the European Marine Strategy Framework Directive (MSFD). A sample of 107 stomachs, 100 intestines and 125 scats of harbour seals from the Netherlands was analysed for the presence of plastics. Incidence of plastic was 11% for stomachs, 1% for intestines, and 0% for scats. Younger animals, up to...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2017
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.158055