New record of Hexanchus griseus in the northwestern Mediterranean Sea with insights into its biology and feeding ecology: predator or scavenger?
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6 mars 2023
- handle: 10670/1.z48xk9
Ce document est lié à :
https://ejournals.epublishing.ekt.gr/index.php/hcm [...]
Ce document est lié à :
https://ejournals.epublishing.ekt.gr/index.php/hcm [...]
Copyright (c) 2023 Mediterranean Marine Science
Mots-clés
bluntnose sixgill shark reproductive biology predation scavenging behaviour stomach content striped dolphinSujets proches
Domestic animals--Feeding and feeds Feeding of animals Livestock--Feeding and feeds Feeding Feeding, Animal Animals--Feeding and feeds Stenella styx Stenella crotaphiscus Stenella euphrosyne Delphinus coeruleo-albus Stenella asthenops Stenella coeruleoalba Stenella tethyos Mare NostrumCiter ce document
DAVID RUIZ-GARCÍA et al., « New record of Hexanchus griseus in the northwestern Mediterranean Sea with insights into its biology and feeding ecology: predator or scavenger? », eJournals, ID : 10670/1.z48xk9
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Résumé
On 15 March 2021, a male Hexanchus griseus was incidentally captured by a commercial bottom trawler at 550-730 m depth in the Gulf of Valencia (Spain). The specimen measured 251.8 cm in total length, weighed 86.2 kg and its reproductive system was fully developed, characterizing it as the smallest mature male bluntnose sixgill shark recorded in the Mediterranean Sea. The specimen hosted the ectoparasitic copepod Demoleus heptapus. Remains of a Stenella coeruleoalba calf were identified in its stomach content by applying molecular methods. The feeding behaviour of H. griseus as either actively preying on live cetaceans or as scavenging on carcasses is reviewed and discussed to better understand the species’ role in marine food webs.