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多少朋友鲨鱼会在facebook上吗

作者:admin 时间:2018-09-24

Sharks have a reputation of solitary predators。 They’;re not the life of the party, so to say; one new research casts doubt on this assumption, though。 The findings suggest that sharks, or at least Sand Tiger sharks, have a complex social structure not all that different in some instances from highly social mammals like dolphins, chimps or even humans。

Sand Tiger sharks often get mistaken for great whites。 They are in fact harmless and never attack humans。 Photo: Danielle Haulsee。

Sand Tiger sharks often get mistaken for great whites。 They are in fact harmless and never attack humans。 Photo: Danielle Haulsee。

Tracking sharks is very difficult。 Most studies follow sharks kept in pens or in a lab environment but the researchers at University of Delaware in Lewes used acoustic tags to track the movements of over 300 individual Sand Tiger sharks。 The tracking was made in the wild and took a whole year。

For this reason, not a lot is known about how sharks behave in the wild。 Every year Sand Tiger sharks undertake long migrations。 This means they always appear seasonally –; normally within a specific time period of several weeks –; at the same places。 In the summer, Sand Tigers congregate together in the shallow waters of the Delaware Bay。 For the rest of the year, though, it’;s all a black box for biologists。

The initial readings from only two sharks show that each individual encountered nearly 200 other sand tigers throughout the year, as well as several individuals from other shark species。 In some instances, the same sharks were encountered mul***le times throughout the year。 Interestingly, the sharks congregate in groups but only in some locations and for a limited time。 This is what the scientists called fission-fusion social behavior。

本文源自: 环亚娱乐

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