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SC/69A/CMP/02
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Resource ID
19959
Access
Open
Document Number
SC/69A/CMP/02
Full Title
Southern Right Whale Eubalaena australis in the Golfo San Matías (Patagonia, Argentina): an update of recolonization process
Author
Magdalena Arias, Mariano A. Coscarella, Enrique A. Crespo, Raúl A. González (1)
Authors Summary
The paper updates the rate of increase and a relative abundance of each age and sex of southern right whale for the Golfo San Matias, Argentina, in a context of a recolonization process. The results indicate a high interannual variability in the total number of whales in the
coastal area counted by aerial surveys. An increase in sightings of mother calf pairs in in Bahía San Antonio Marine Protected Area was recorded indicated the beginning of a new stage in the recolonization process. There were differences observed between the aerial and on-board surveys underlining the significance of monitoring both the coastal zone and the
offshore area.
Publication Year
2023
Abstract
1. Southern Right Whales is thought to be experiencing a density-dependent process
while expanding its distribution range in Patagonia.
2. The recovery of the species and the increase in the number of SRW sightings in GSM
created a new opportunity to develop the whale-watching activity in Bahía San
Antonio Marine Protected Area.
3. This paper reports an update of the population growth trend and changes in the age
and sex classes of the right whale in the Golfo San Matias estimated from a data set
collected through both aerial censuses and on-board whale-watching surveys.
4. Aerial counts show showed a high variability between years, and consequently no
significant change in abundance was recorded over the years.
5. For the first time in the last 9 years of monitoring the whale-watching activity, mother
calf pairs were the predominant group sighted during all months of the season.
6. The increase in sightings of mother calf pairs in in Bahía San Antonio Marine
Protected Area indicates the beginning of a new stage in the recolonization process.
7. The differences observed between the aerial and on-board surveys underlining the
significance of monitoring both the coastal zone and the offshore area.