This web application uses cookies and other tracking technologies to ensure you get the best experience.
SC/69B/CMP/04
Download this file582 KB |
Download |
View directly in browser582 KB |
View in browser |
Resource ID
22047
Access
Open
Document Number
SC/69B/CMP/04
Full Title
Temporal dynamic of the southern right whales in Pen¡nsula Vald‚s and Golfo San Mat¡as
Author
Mariano A. Coscarella, Magdalena Arias, Nicolas Sueyro , Santiago Fern ndez, M. Alejandra Romero , Ra£l Gonzalez And Enrique A. Crespo
Authors Summary
The exploitation of southern right whales (Eubalaena australis) (SRW) in the Western South Atlantic left the stock with a current population estimate of 4,749 whales of which approximately 36% frequents the waters of Pen¡nsula Vald‚s (PV) annually (Romero et al. 2022). The population is recovering, and the dynamics of this recovery process has been monitored in the area since 1999 by means of coastal air surveys. During this period, the relative abundance of SRW in the area increased with a reducing increasing rate over the last 15 years (6% in 2007 to a 2.9% in 2023). The falling increasing rate is restricted to the surveyed area, where other changes in the dynamics of the population have been observed. The PV area has now a higher relative abundance of mother with calves groups and a diminishing abundance of solitary individuals and breeding groups. Changes in distribution have also been noticed, with whales in deeper waters beyond the surveyed area and increasing abundance in Golfo San Mat¡as (GSM), 250km north of PV. In 2012 aerial surveys using the same methodology as in PV were started to record the phenomenon in GSM. The analyzed information in this study presents an integrated model that evaluates the dynamics of the arrival of whales to both areas, where the whales arrive earlier to PV than to GSM, with GSM receiving a 10% of the individuals. Also, the model suggests a temporal change in the arrival and departure of the whales to and from the area, arriving 25 days, peaking in their numbers 20 days and leaving the area 14 days earlier than they did in the past. This changes may have profound consequences in the way the whale watching activity is carried out in PV.
Publisher
IWC
Publication Year
2024
Abstract
Temporal dynamics of SRW in Peninsula Vald‚s and Golfo San Mat¡as analyzes the increasing of the south Atlantic population dynamics in the brreding ground, and how it changed in the last 25 years detecting temporal trends in the arrival and leaving time of the whales in both areas. It is discussed the implications it has for the whale watching ativities.