[MARMAM] Marmam Posting: New Publication

jessica carvalho jcarvalho.dhs at gmail.com
Thu Sep 1 08:54:10 PDT 2022

 Aloha Colleagues,

On behalf of myself and my co-authors, Marc Lammers, Katherine Indeck, Adam
Pack, and Rita Castilho, I am pleased to share our paper "Comparing the
social signaling behavior of humpback whales in three group types on the
Hawaiian breeding grounds using acoustic tags" just published in the
journal *Frontiers in Remote Sensing*. Please find the abstract and the
full citation for the article below.

If you have any questions, don't hesitate to contact me at
jcarvalho.dhs at gmail.com.


Carvalho, J., M. O. Lammers, K. L. Indeck, A. A. Pack, and R. Castilho.
2022. Comparing the social signaling behavior of humpback whales in three
group types on the Hawaiian breeding grounds using acoustic tags. Frontiers
in Remote Sensing *3*. DOI: 10.3389/frsen.2022.910455



Humpback whales (Megaptera novaeangliae) are exceptionally vocal among
baleen whale species. While extensive research has been conducted on
humpback whale songs, gaps remain in our understanding of other forms of
communication, particularly non-song calls. Here, we compare the spectral
features and temporal parameters of non-song calls recorded from Acousonde
tagged humpback whales in three commonly observed group types in the
breeding grounds: adult dyads (N = 3), singly escorted mother-calf pairs (N
= 4), and competitive groups (N = 4). Recordings were collected off Maui,
Hawai’i during the winter breeding seasons of 2019–2021. Individual calls
were identified based on visual and aural inspection of spectrograms using
Raven Pro 1.6 software, with a total of 842 calls isolated from 47.6 h of
acoustic recordings. Competitive groups produced the most calls (N = 358);
however, after adjusting for the differences in recording hours and the
number of individuals, the call rate (calls/hour/whale) was not
significantly different between group compositions. The temporal parameters
and frequency measures of calls did not vary significantly across the
groups. However, interesting patterns of calling behavior were observed
(e.g., competitive groups had the shortest inter-call intervals and the
highest frequency calls, and escorted mother-calf pairs had the longest
inter-call intervals) and it is possible the lack of statistical
significance could be attributed to the small sample size of tag
deployments. This study provides new insights into humpback whale vocal
communication behavior in the Hawaiian Islands breeding grounds.
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