Durophagy in sharks: feeding mechanics of the hammerhead Sphyrna tiburo
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چکیده
منابع مشابه
Durophagy in sharks: feeding mechanics of the hammerhead Sphyrna tiburo.
This study investigates the motor pattern and head movements during feeding of a durophagus shark, the bonnethead Sphyrna tiburo, using electromyography and simultaneous high-speed video. Sphyrna tiburo feeds almost exclusively on hard-shelled crabs, with shrimp and fish taken occasionally. It captures crabs by ram feeding, then processes or reduces the prey by crushing it between molariform te...
متن کاملThe sexually dimorphic cephalofoil of bonnethead sharks, Sphyrna tiburo.
Sexually dimorphic head shape is common in vertebrates from teleosts to mammals. Herein we document that cephalic sexual dimorphism is also found in the cartilaginous fishes (Chondrichthyes). Male bonnethead sharks develop a prominent bulge along the anterior margin of the cephalofoil at the onset of sexual maturity. This contrasts with the uniformly rounded anterior margin of adult females and...
متن کاملPredominance of genetic monogamy by females in a hammerhead shark, Sphyrna tiburo: implications for shark conservation.
There is growing interest in the mating systems of sharks and their relatives (Class Chondrichthyes) because these ancient fishes occupy a key position in vertebrate phylogeny and are increasingly in need of conservation due to widespread overexploitation. Based on precious few genetic and field observational studies, current speculation is that polyandrous mating strategies and multiple patern...
متن کاملTracking the fin trade: genetic stock identification in western Atlantic scalloped hammerhead sharks Sphyrna lewini
Location or stock-specific landing data are necessary to improve management of shark stocks, especially those imperiled by overexploitation as a result of the international shark fin trade. In the current absence of catch monitoring directly at extraction sites, genetic stock identification of fins collected from major market supply chain endpoints offers an overlooked but potentially useful ap...
متن کاملBioenergetics of free-ranging juvenile scalloped hammerhead sharks (Sphyrna lewini) in Kāne’ohe Bay, Ō’ahu, HI
Metabolic and activity rates determined from free-ranging juvenile scalloped hammerhead shark pups (Sphyrna lewini) in Kāne’ohe Bay, Ō’ahu, HI, were used to develop a simplified energy budget for this population. Five shark pups were tracked using a specially designed acoustic tail beat transmitter. Previous laboratory experiments determined that tail beat frequency (TBF) and water temperature ...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2000
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.203.18.2781