[MARMAM] Risso dolphin paper

Dorete Bloch doreteb at savn.fo
Mon Aug 20 10:23:57 PDT 2012


This paper has just appeared. A pdf.file can be send you from doreteb at savn.fo<mailto:doreteb at savn.fo> or taken online from the journal later in this month.
Dorete Bloch

Bloch, D., Desportes, G., Harvey, P., Lockyer, C. and Mikkelsen, M. 2012. Life History of Risso's Dolphin, Grampus griseus (G. Cuvier, 1812), in the Faroe Islands. Aquatic Mammals Journal 38: 250-266.

Abstract:


AbstractRisso's dolphins (Grampus griseus) were taken for the first time by the opportunistic drive fishery in the Faroe Islands in two separate incidents: three in September 2009 and 21 in April 2010, with in total 16 females and eight males. Their sizes ranged from 193 to 308 cm in length and 60 to 395 kg in weight for females, and 186 to 323 cm in length and 70 to 505 kg in weight for males; the maximum weights are heavier than previously documented for this species. The smallest mature female was 277 cm long, while the youngest and also lightest mature female was 8 y old and weighed 280 kg. Sperm competition and a pro-miscuous mating system were suggested for the species based on large testicular masses. The diet was composed of cephalopods from both the water column (Todarodes and Loligo) and the ocean floor (Eledona and Todaropsis). Although both schools landed showed a mixed diet, the September school diet centred on a pelagic squid (Todarodes sagit-tatus), while the April school diet centred upon a benthic octopod (Eledona cirrhosa). Since August 2009, Risso's dolphins have been observed on five occasions in waters around the Faroese north of 61º 34' N, the northernmost observation situated at a latitude of 62º 23' N. Sightings of the spe-cies off Shetland occur mostly between April and September, with a peak in August and September, the observations in Faroese waters (2 in April, 1 in August, and 2 in September) falling within this period. While the species had not previously been observed in this area north of the Shetland-Faroe Channel, these observations in Faroese territorial waters indicate a likely northward extension of the known range of the species.



NB: New e-mail address and phones
Dorete Bloch
Prof., PhD.
Museum of Natural History
Fútalág 40
FO-100 Tórshavn
Faroe Islands
E-mail address: doreteb at savn.fo<mailto:doreteb at savn.fo>
Phone: +298 34 05 78
Mobile: +298 79 05 78
www.ngs.fo<http://www.ngs.fo>
Private phone: +298 32 80 45
Private mobile: +298 21 81 45

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