[MARMAM] Striped dolphins and short-beaked common dolphins in the Gulf of Corinth, Greece: abundance estimates from dorsal fin photographs
giovanni.bearzi at gmail.com
Fri Feb 11 20:16:05 PST 2011
The following article has become available online:
Striped dolphins and short-beaked common dolphins in the Gulf of Corinth,
Greece: abundance estimates from dorsal fin photographs
Giovanni BEARZI, Silvia BONIZZONI, Stefano AGAZZI, Joan GONZALVO, Rohan J.C.
Marine Mammal Science (2011)
Capture-recapture methods relying on dorsal fin natural markings have never
been applied successfully to striped dolphins, Stenella coeruleoalba, and
were rarely used to assess abundance of short-beaked common dolphins,
Delphinus delphis. We used digital photo-identification to obtain abundance
estimates of striped and common dolphins living in mixed groups in the Gulf
of Corinth, Greece. The proportion of either species was calculated based
on the relative number of photographs of adult animals showing relevant
portions of their body during conspicuous surfacings. Striped dolphins and
common dolphins averaged 95.0% and 3.2% of all individuals, respectively.
Animals showing intermediate pigmentation accounted for another 1.8%.
Striped dolphin numbers were relatively high, with a point estimate of 835
animals (95% CI = 6311,106). Common dolphins numbers were low (point
estimate 28 animals; 95% CI = 1173) and individuals were scattered within
striped dolphin groups, indicating that this common dolphin population may
be nonviable. Within a semiclosed Gulf exposed to considerable
anthropogenic impact, the future of both dolphin species is of concern due
to their suspected geographic isolation and restricted extent of occurrence.
Information provided here can be used to inform timely conservation efforts.
A pdf copy can be obtained from the journal's web site (subscribers only):
or from me:
giovanni.bearzi at gmail.com <mailto:giovanni.bearzi at gmail.com>
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