Fróðskaparrit - 01.01.1992, Side 11

THE INTERNATIONAL RESEARCH .. .
15
of some schools differed significantly from
that of the remainder. This heterogeneity,
however, cannot be explained by any obvi-
ous geographical or seasonal pattern. The
schools presenting a significant deviation
in allele frequencies from most of the other
schools were landed at the following places
and dates, presented in descending order in
allele frequencies, beginning with Tórs-
havn, 081087 as the school most different
from the others, followed by Leynar
120786; then at the same level Víðvík,
270986; Hvalvík, 241186; Miðvágur,
240787; Leynar, 100688; and Funnings-
fjørður, 201086. The rest of the schools
showed some degree of genetic differentia-
tion, but not as frequently as the above-
mentioned.
The females within one group were more
related to each other than with the females
of other groups and this could suggest a
strong matemal family stmcture with
breeding males migrating between the
schools.
Analyses of genetic variation at three
polymorphic allozyme loci using a selec-
tion component analysis is currently being
carried out. It has already provided further
genetic evidence for migration of breeding
males between schools. Modelling of the
population stmcture based on genetic vari-
ation will be undertaken (Andersen, pers.
comm.).
Andersen, L. W. 1987. An investigation of the population
structure of the long-finned pilot whale, Globicephala
melaena, around the Faroe Islands on basis of isoen-
zyme. Paper SC/39/SM13 presented to the IWC
Scientific Committee, May 1987 (unpublished). 1-10.
Andersen, L.W. 1988. Electrophoretic differentiation
among local populations of the long-fmned pilot whale.
Globicephala melaena, at the Faroe Islands. Can. J.
Zool. 66: 1884-1892.
Andersen, L.W. 1989. Further studies on the population
structure of Globicephala melas off the Faroe Islands.
Paper SC/41/SM17 presented to the IWC Scientific
Committee, May 1989 (unpublished). 1-21.
Andersen, L.W. 1990. The population structure and sex
determination of the long-fmned pilot whale,
Globicephala melas, and the harbour porpoise,
Phocoena phocoena. PhD thesis, Aarhus University,
Denmark. 1-65.
Andersen, L. W. In press. Further studies on the population
structure of Globicephala melas, off the Faroe Islands.
Rep.int.Whal.Commn (Special Issue 14).
Andersen, L.W. and Siegismund, H.R. in press. Genetic
evidence for migration of males between schools of the
long-finned pilot whale, Globicephala melas off the
Faroe Islands. Marine Ecology Progress.
Comparison of morphological parameters:
Faroese pilot whale data is being compared
with pilot whale data from the New-
foundland drive fishery (Sergeant, 1962a;
1962b), Icelandic mass strandings (J.
Sigurjónsson, pers. comm.), and French
strandings (A. Collet, pers. comm.).
Preliminary results from morphological
comparison indicate that long-finned pilot
whales off Newfoundland differ signifi-
cantly from pilot whales off the Faroes.
Northwest Atlantic pilot whales seem to
have longer skulls and shorter torsoes than
the Northeast Atlantic ones. Flipper lengths
are longer in Newfoundland males than in
Faroese ones. Sea current pattems and
oceanic topographical conditions have
been linked to data on distribution.
Bloch, D. and Lastein, L. 1992. Biometrical segregation of
pilot whales off eastem and westem North Atlantic.
ICES C. M. 1992/N:21 (unpublished). 1-18.
Bloch, D. and Lastein, L. 1993. Biometrical segregation
of pilot whales off eastern and western North Atlantic.
Ophelia 38(2): 55-68.