scholarly journals Omnidirectional passive acoustic identification tags for underwater navigation

2020 ◽  
Vol 147 (6) ◽  
pp. EL517-EL522
Author(s):  
Aprameya Satish ◽  
David Trivett ◽  
Karim G. Sabra
Keyword(s):  
Underwater Navigation ◽  
Identification Tags ◽  
Acoustic Identification ◽  
Passive Acoustic

scholarly journals Acoustic Censusing and Individual Identification of Birds in the Wild

2021 ◽  
Author(s):  
Carol L. Bedoya ◽  
Laura E. Molles
Keyword(s):  
Population Size ◽  
Fuzzy Classification ◽  
Individual Identification ◽  
Vocal Individuality ◽  
Neuro Fuzzy ◽  
In The Wild ◽  
Acoustic Censusing ◽  
Acoustic Identification ◽  
Using Data ◽  
Passive Acoustic

Avian vocal individuality carries information that can be utilized as an alternative to physical tagging of individuals. However, it is rarely used in conservation tasks despite rapidly-expanding use of passive acoustic monitoring techniques. Reliable acoustic individual recognizers and accurate quantifiers of population size remain elusive, which discourages the use of vocal individuality for monitoring, wildlife management, and ecological research. We propose a neuro-fuzzy framework that allows discrimination of individuals by their calls, the discovery of unexpected individuals in a set of recordings, and estimation of population size using solely sound. Our method, tested using data collected in the wild, allows rapid individual identification and even acoustic censusing without prior information from the recorded individuals. We achieve this by integrating a fuzzy classification and clustering methodology (LAMDA) into a Convolutional Deep Clustering Neural Network (CDCN). Our approach will benefit monitoring for conservation, and paves the way towards robust individual acoustic identification in species whose handling is time-consuming, culturally or ethically problematic, or logistically difficult.

Contextual rhythmic analysis of beaked whale clicks for passive acoustic identification.

2010 ◽  
Vol 127 (3) ◽  
pp. 2004-2004
Author(s):  
Natalia Sidorovskaia ◽  
Philip Schexnayder ◽  
George E. Ioup ◽  
Juliette W. Ioup ◽  
Christopher O. Tiemann ◽  
...  
Keyword(s):  
Beaked Whale ◽  
Acoustic Identification ◽  
Passive Acoustic

Spatiotemporal distribution of foraging in a marine predator: behavioural drivers of hotspot formation

2020 ◽  
Vol 635 ◽  
pp. 187-202
Author(s):  
T Brough ◽  
W Rayment ◽  
E Slooten ◽  
S Dawson
Keyword(s):  
Time Of Day ◽  
Spatiotemporal Distribution ◽  
Temporal Effects ◽  
Marine Predator ◽  
Marine Predators ◽  
Additive Mixed Models ◽  
Density Analysis ◽  
The Times ◽  
Passive Acoustic ◽  
Spatial Locations

Many species of marine predators display defined hotspots in their distribution, although the reasons why this happens are not well understood in some species. Understanding whether hotspots are used for certain behaviours provides insights into the importance of these areas for the predators’ ecology and population viability. In this study, we investigated the spatiotemporal distribution of foraging behaviour in Hector’s dolphin Cephalorhynchus hectori, a small, endangered species from New Zealand. Passive acoustic monitoring of foraging ‘buzzes’ was carried out at 4 hotspots and 6 lower-use, ‘reference areas’, chosen randomly based on a previous density analysis of visual sightings. The distribution of buzzes was modelled among spatial locations and on 3 temporal scales (season, time of day, tidal state) with generalised additive mixed models using 82000 h of monitoring data. Foraging rates were significantly influenced by all 3 temporal effects, with substantial variation in the importance and nature of each effect among locations. The complexity of the temporal effects on foraging is likely due to the patchy nature of prey distributions and shows how foraging is highly variable at fine scales. Foraging rates were highest at the hotspots, suggesting that feeding opportunities shape fine-scale distribution in Hector’s dolphin. Foraging can be disrupted by anthropogenic influences. Thus, information from this study can be used to manage threats to this vital behaviour in the locations and at the times where it is most prevalent.

First in situ passive acoustic monitoring for marine mammals during operation of a tidal turbine in Ramsey Sound, Wales

2018 ◽  
Vol 590 ◽  
pp. 247-266 ◽  
Author(s):  
CE Malinka ◽  
DM Gillespie ◽  
JDJ Macaulay ◽  
R Joy ◽  
CE Sparling
Keyword(s):  
Marine Mammals ◽  
Acoustic Monitoring ◽  
Passive Acoustic Monitoring ◽  
Tidal Turbine ◽  
Passive Acoustic
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