Subject: Abstract Cetaceans Observations in Chilean Waters (fwd)

Mike Williamson (
Sun, 20 Sep 1998 19:22:10 -0400 (EDT)

---------- Forwarded message ----------
Date: Sat, 19 Sep 1998 14:01:17 -0300
From: Veronica Isabel Vallejos Marchant <>
Subject: Abstract Cetaceans Observations in Chilean Waters

Aguayo, A., R. Bernal, C. Olavarria, V. Vallejos & R. Hucke-Gaete. 1998.
Cetacean observations carried out between Valparamso and Easter Island,
Chile, in the winters of 1993, 1994 and 1995. Revista de Biologia Marina y
Oceanografia 33 (1): 101-123.

        The aim of this paper is to report the different species of cetaceans
sighted between Valparamso and Easter Island (Rapa Nui), during five
cruises made during winter seasons of 1993 to 1995, to explain  their
spatial distribution during the winter months.The cetacean species  sighted
were: Balaenoptera musculus intermedia, Balaenoptera physalus quoyi,
Balaenoptera borealis schlegelii, Balaenoptera edeni, Balaenoptera
bonaerensis, Megaptera novaeangliae australis, Physeter catodon, Ziphius
cavirostris, Mesoplodon densirostris, Orcinus orca, Pseudorca crassidens,
Globicephala melas edwardii, Delphinus delphis, Tursiops truncatus,
Lissodelphis peronii and Lagenorhynchus obscurus.The distribution of the
records showed three subareas of animal concentration. First,  between 112:
and 91: W. Second, between 90: and 77: W. Third, between 76: W and
Valparamso (71037' W). The possible indicative species of each subarea
were: Subarea 1.   B. bonaerensis, M. densirostris, P. crassidens and Z.
cavirostris. Subarea 2.  B. borealis schlegelii, B. edeni and M.
novaeangliae australis. Subarea 3. G. melas edwardii, L. peronii and L.
obscurus. The first records of the following cetaceans species in the study
area are: B. musculus intermedia, B. bonaerensis, M. densirostris and Z.
cavirostris in the waters of the first subarea; B. musculus intermedia and
B. edeni in the waters of the second subarea. The species mostly sighted
was P. catodon (1.65 sight per day), which also had the wider range of
distribution during those winter seasons, followed by B. physalus quoyi
(1.27), D. delphis (1.01), B. bonaerensis (0.89), T. truncatus (0.76) and
B. borealis schlegelii (0.51). However, as it was expected, the most
abundant species, expressed in animals per day, was the small odontocetes
D. delphis (212.78) and T. truncatus (54.55), followed by P. catodon

Reprint requests should be sent to:
Anelio Aguayo
Instituto Antartico Chileno
Casilla 16521, Correo 9, Santiago, Chile
Fax: (56-2) 232 04 40