[MARMAM] [New paper] Bryde’s whales in South Brazil Bight: evidence of low genetic diversity and seasonal habitat use

Larissa Dalpaz lari.dalpaz at gmail.com
Mon Jun 19 20:19:12 PDT 2023


Dear MARMAMers,

We are happy to share our new paper on genetic diversity and habitat use of
Bryde's whales in Brazilian waters, published in Marine Biology.

Links to access the paper:
- https://rdcu.be/deUv0
- https://doi.org/10.1007/s00227-023-04241-0

Abstract
Bryde's whale (Balaenoptera brydei) is the only non-migratory (resident)
baleen whale in Brazil, remaining year-round in the subtropical seas, but
are among the least known whales. By combining genetics and spatial
analysis, we aim to characterize the genetic diversity and determine the
spatiotemporal distribution and habitat-use patterns for the Bryde’s whale
population in the South Brazil Bight, in the Santos Basin (23°S to 28°S /
40°W to 49°W). During surveys (n = 16) between 2015 and 2018, we recorded
82 Bryde’s whale groups and collected biopsy samples from 13 individuals.
Based on our samples, the population of Bryde's whales presented low
genetic diversity. Its distribution varied seasonally, with records
occurring mainly in the north of the study area, near Cabo Frio, during
warm seasons and in southern waters during cold seasons. The oceanographic
dynamics, characterized by diverse frontal systems that enhance
productivity on the shelf, likely drive the distribution of the whales, and
the seasonal shifts between core areas seem to reflect changes in
productivity and prey availability. Our results bring unprecedented
information to understand the ecology of Bryde's whales on the Brazilian
coast, and how their distribution and habitats are critically linked with
the South Brazil Bight marine environment and its dynamics.


Please feel free to email me for a pdf copy if you have any issues
accessing the links.

All my best,
Larissa Dalpaz
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