Group items tagged

Adult male sperm whales (Physeter macrocephalus) are long distance runners of the marine realm, feeding in high latitudes and mating in tropical and subtropical waters where stable social groups of females and immatures live. Several areas of uncertainty still limit our understanding of their social and breeding behavior, in particular concerning the potential existence of geographical and/or social fidelities. In this study, using underwater observation and sloughed-skin sampling, we looked for male social fidelity to a specific matrilineal sperm whale group near Mauritius. In addition, we captured a wider picture of kin relationships and genetic diversity of male sperm whales in the Indian Ocean thanks to biopsies of eight individuals taken in a feeding ground near the Kerguelen and Crozet Archipelagos (Southern Indian Ocean). Twenty-six adult male sperm whales were identified when socializing with adult females and immatures off Mauritius. Sloughed-skin samples were taken from thirteen of them for genetic analysis. Long-term underwater observation recorded several noteworthy social interactions between adult males and adult females and/or immatures. We identified seven possible male recaptures over different years (three by direct observation, and four at the gametic level), which supports a certain level of male social fidelity. Two probable first- and thirty second-degree kin relationships were highlighted between members of the social unit and adult males, confirming that some of the adult males observed in Mauritian waters are reproductive. Male social philopatry to their natal group can be excluded, as none of the males sampled shared the haplotype characteristic of the matrilineal social group. Mitochondrial DNA control region haplotype and nucleotide diversities calculated over the 21 total male sperm whales sampled were similar to values found by others in the Indian Ocean. Our study strongly supports the existence of some levels of male sperm whale socia

A photographer slips into the ocean to swim amoung hundreds of sperm whales - witnessing a rarely seen social spectacle.

Sperm whale's skin comes off during mass 'scratchathon'.

The freedivers who swim with whales.

Indonesians clean up the beach one sandal at a time.

Just a month after the start of the Vendée Globe, on 6th December in the middle of the Indian Ocean to the north of the CROZET Islands, Kito DE PAVANT and his Bastide Otio hit an unidentified floating object. The damage was fatal for the boat and the skipper was forced to abandon the race and his monohull.... Fortunately, the French vessel, the MARION-DUFRESNE, which delivers supplies to the French islands in the Antarctic and Southern Ocean, was sailing close to the area when the incident happened. Kito was rescued and taken aboard the ship, which continued her delivery trip. A few months later, they were able to watch the videos recorded on the hard disk aboard the boat, and discovered that the unidentified object was in fact a sperm whale, which was clearly visible in the wake of the boat. You can watch the video here. Hang on tight!

Whales at war! A battle between awesome predators.

Research project aims to unravel the mystery of deep-sea whales off Fujairah's coast.

Beached whales led out to sea off Indonesia's Aceh but 4 die.

What happens to beached whales?