Redaelli Laura

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Last Name
Redaelli
First Name
Laura
ORCID
0000-0002-6409-5032

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  • Article
    Seasonal trends and diel patterns of downsweep and SEP calls in Chilean blue whales
    (MDPI, 2022-02-23) Redaelli, Laura ; Mangia Woods, Sari ; Landea Briones, Rafaela ; Sayigh, Laela S.
    To learn more about the occurrence and behaviour of a recently discovered population of blue whales, passive acoustic data were collected between January 2012 and April 2013 in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SEP calls) and D calls, which were then analysed to gain insights into temporal calling patterns. We found that D call rates were extremely low during winter (June–August) but gradually increased in spring and summer, decreasing again later during fall. SEP calls were absent for most winter and spring months (July–November) but increased in summer and fall, peaking between March and April. Thus, our results support previous studies documenting the austral summer residency of blue whales in this region, while suggesting that some individuals stay longer, highlighting the importance of this area as a blue whale habitat. We also investigated the daily occurrence of each call type and found that D calls occurred more frequently during dusk and night hours compared to dawn and day periods, whereas SEP calls did not show any significant diel patterns. Overall, these findings help to understand the occurrence and behaviour of endangered Chilean blue whales, enhancing our ability to develop conservation strategies in this important Southern Hemisphere habitat.
  • Dataset
    Seasonal trends and diel patterns of downsweep and SEP calls in Chilean blue whales (Balaenoptera musculus)
    (Woods Hole Oceanographic Institution, 2022-01-13) Redaelli, Laura ; Mangia Woods, Sari ; Landea Briones, Rafaela ; Sayigh, Laela S.
    To learn more about occurrence and behavior of a recently discovered population of blue whales, passive acoustic data were collected for 15 consecutive months (January 2012 – April 2013) in the Chiloense ecoregion of southern Chile. Automatic detectors and manual auditing were used to detect blue whale songs (SEP calls) and D calls, which were then analyzed to gain insights into temporal calling patterns. We found a year-round acoustic presence of D calls, with the majority occurring during austral summer (December to April), with several sub-monthly peaks. On the other hand, no SEP calls were found during austral winter. Thus, our results support previous studies documenting austral summer residency of blue whales in the Chiloense ecoregion, although they suggest that some individuals remain in the area year-round, highlighting the importance of the Chiloense ecoregion as blue whale habitat. We also investigated daily occurrence of each call type and found that D calls occurred more frequently during dusk and night hours compared to dawn and day periods, whereas SEP calls did not show any significant diel differences. Overall, these findings contribute to a better understanding of occurrence and behavior of endangered Chilean blue whales, which can enhance our ability to develop conservation strategies in this important southern hemisphere habitat.