[MARMAM] New publication: Aerial photogrammetry - Sousa chinensis

agathe serres agathe.serres11 at gmail.com
Wed Feb 7 17:59:29 PST 2024

Dear colleagues,
My co-authors and I are pleased to announce the publication of our latest
article entitled "Skinny dolphins: Can poor body condition explain
population decline in Indo-Pacific humpback dolphins (Sousa chinensis)?" in
the journal Science of the Total Environment.

Here is the link to the article:

Below is the abstract of this article, please feel free to contact me if
you want a PDF copy.

*Abstract: *Indo-Pacific humpback dolphins (IPHDs) who form resident
populations along the Chinese coastline are facing a wide range of
anthropogenic disturbances including intense fishing and some populations
have been shown to experience a severe decline. Body condition is thought
to be a good indicator of health since it is linked to survival and
reproductive success. In order to better understand population trends, we
investigated whether the body condition of IPHDs is poorer in populations
whose status is alarming than in other populations. UAV flights were
conducted from 2022 to 2023 in four locations (i.e., Sanniang Bay, Leizhou
Bay, Jiangmen, and Lingding Bay) in the northern South China Sea. Body
ratios were calculated using the body length and widths of IPHDs and were
used to analyze differences among seasons, locations, and demographic
parameters. A PCA was then used to obtain a detailed picture of the body
condition composition of dolphins at each location. Results showed that
dolphins from Leizhou Bay and Jiangmen were in better body condition than
those from Sanniang Bay and Lingding Bay. Since populations inhabiting
Sanniang Bay and Lingding Bay have been shown to experience a sharp
decline, it can be hypothesized that poor body condition may have played a
role in such a trend. Further investigations of the factors impacting
IPHDs’ body condition are needed, including monitoring of prey density,
contaminant concentration, stress levels, and impacts of human activities
on dolphins’ behavior. In addition, the creation of a robust scoring method
would allow for regular monitoring of IPHDs’ body condition to inform
conservation measures.

All the best,

Agathe Serres, Ph.D.
Postdoctoral researcher
Institute of Deep Sea Science and Engineering, Sanya, China
agathe.serres11 at gmail.com
*agathe at idsse.ac.cn <agathe at idsse.ac.cn>*
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