Dear MARMAM recipients,
my co-authors and I are pleased to announce the publication of our
article in Frontiers in Remote Sensing:
Caruso F, Giorli G, Dong L, Zhao L, Liu M, Lin M and Li S (2022),
Large-scale monitoring of Indo-Pacific finless porpoises (/Neophocaena
phocaenoides/) using multiple static acoustic sensors. Front. Remote
Sens. 3:987105. doi: 10.3389/frsen.2022.987105
ABSTRACT
The distribution of Indo-Pacific finless porpoise (IPFP, /Neophocaena
phocaenoides/) around the Hainan Island (China) is unknown, but
evidences for a resident population have recently emerged. Passive
acoustic data were collected from 10 locations along the south-west area
of the island using static sensors (about 200 km of coastline), over a
total period of 476 days from 25th February 2018 to 16th June 2019
(154,884 5-min recordings). A supervised machine learning technique was
used to classify IPFP clicks and acoustic features were measured for
2,654 short-narrowband pulses detected within 47 days across the 10
sites. Detections were verified by a trained operator using spectrogram
analysis and the detection range of the clicks was estimated using a
Transmission Loss (TL) model. The animals were not detected at all
locations and the site with the highest number of detections was
characterized by low levels of ambient noise, abundance of soniferous
fishes and the presence of another marine mammal species, the Indo-Pacific
humpback dolphin (/Sousa chinensis/). The northernmost region had no
detections and only two recorded files containing IPFP clicks were found
at the two nearby locations (one file each). In general, the low number
of detections in the study area are most likely a result of the limited
detection range (about 200 m) of IPFP echolocation signals. This is a
nationally protected species and the Hainan population is increasingly
subject to many threats. The large-scale and long-term monitoring
approach provides information regarding the spatial acoustic occurrence
of this vulnerable, nearshore and small-size cetacean.
https://doi.org/10.3389/frsen.2022.987105
Best,
Francesco
--
Francesco Caruso, PhD
Researcher, Marine Biologist and Ecologist
https://www.researchgate.net/profile/Francesco-Caruso
Stazione Zoologica Anton Dohrn (http://www.szn.it/en/)
Department of Marine Animal Conservation and Public Engagement
National Institute of Marine Biology, Ecology and Biotechnology
Villa Comunale, Naples, 80121, Italy
Phone:+390815833461
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