Automated classification of dolphin echolocation click types from the Gulf of Mexico

Frasier, Kaitlin E.; Roch, Marie A.; Soldevilla, Melissa S.; Wiggins, Sean M.; Garrison, Lance P.; Hildebrand, John A.

doi:10.1371/journal.pcbi.1005823

Cited by 55 publications

(65 citation statements)

References 41 publications

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“…Where there are increased broadband detections at the offshore locations, the data warrant further investigation, but classification is not possible. These areas would benefit from either increased visual survey effort or more advanced acoustic techniques that have recently shown promise in discriminating between common and bottlenose dolphins (Frasier et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…These areas would benefit from either increased visual survey effort or more advanced acoustic techniques that have recently shown promise in discriminating between common and bottlenose dolphins (Frasier et al, 2017). Where there are increased broadband detections at the offshore locations, the data warrant further investigation, but classification is not possible.…”

Section: Figurementioning

confidence: 99%

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Habitat use of a coastal delphinid population investigated using passive acoustic monitoring

Palmer

Brookes

Davies

et al. 2019

Aquatic Conservation

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1. The population of bottlenose dolphins in eastern Scotland has undergone significant range expansion since the 1990s, when a Special Area of Conservation was established for the population.2. Distribution of this population is well described within areas of its range where intensive work has been carried out, such as the inner Moray Firth, St Andrews Bay and the Tay estuary area. However, elsewhere in their range, habitat use is less well understood.3. In this study, a large-scale and long-term passive acoustic array was used to gain a better understanding of bottlenose dolphin habitat use in eastern Scottish waters, complementing and augmenting existing visual surveys. 4. Data from the array were analysed using a three-stage approach. First, acoustic occupancy results were reported; second, temporal trends were modelled; and third, a spatial-temporal-habitat model of acoustic occupancy was created. 5. Results from the acoustic occupancy are in agreement with visual studies that found that areas near known foraging locations were consistently occupied. Results from the temporal trend analysis were inconclusive. Habitat modelling showed that, throughout their range, bottlenose dolphins are most likely to be detected closer to shore, and at a constant distance from shore, in deeper water.

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Section: Discussionmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Habitat use of a coastal delphinid population investigated using passive acoustic monitoring

Palmer

Brookes

Davies

et al. 2019

Aquatic Conservation

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“…Click detection. Clicks were automatically detected from each chosen click train using an energy detector to identify impulse signals [43]. Click trains were first divided into several 5 ms segments.…”

Section: Data Analysesmentioning

confidence: 99%

Description and classification of echolocation clicks of Indian Ocean humpback (Sousa plumbea) and Indo-Pacific bottlenose (Tursiops aduncus) dolphins from Menai Bay, Zanzibar, East Africa

et al. 2020

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Passive acoustic monitoring (PAM) is a powerful method to study the occurrence, movement and behavior of echolocating odontocetes (toothed whales) in the wild. However, in areas occupied by more than one species, echolocation clicks need to be classified into species. The present study investigated whether the echolocation clicks produced by small, at-risk, resident sympatric populations of Indian Ocean humpback dolphin (Sousa plumbea) and Indo-Pacific bottlenose dolphin (Tursiops aduncus) in Menai Bay, Zanzibar, East Africa, could be classified to allow species specific monitoring. Underwater sounds of S. plumbea and T. aduncus groups were recorded using a SoundTrap 202HF in January and June-August 2015. Eight acoustic parameters, i.e.-10 dB duration, peak, centroid, lower-3 and lower-10 dB frequencies, and-3 dB,-10 dB and root-mean-squared bandwidth, were used to describe and compare the two species' echolocation clicks. Statistical analyses showed that S. plumbea clicks had significantly higher peak, centroid, lower-3 and lower-10 dB frequencies compared to T. aduncus, whereas duration and bandwidth parameters were similar for the two species. Random Forest (RF) classifiers were applied to determine parameters that could be used to classify the two species from echolocation clicks and achieved 28.6% and 90.2% correct species classification rates for S. plumbea and T. aduncus, respectively. Both species were classified at a higher rate than expected at random, however the identified classifiers would only be useful for T. aduncus monitoring. The frequency and bandwidth parameters provided most power for species classification. Further study is necessary to identify useful classifiers for S. plumbea. This study represents a first step in acoustic description and classification of S. plumbea and T. aduncus in the western Indian Ocean region, with potential application for future acoustic monitoring of species-specific temporal and spatial occurrence in these sympatric species.

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“…Another alternative for investigating timing is by looking at the intervals between consecutive events, or IEI [85][86][87] .…”

Section: Rhythm As Temporal Hierarchy In Human and Non-human Vocalizamentioning

confidence: 99%

Evolution of speech rhythm: a cross-species perspective

Ravignani

Bella

Falk

et al. 2019

Preprint

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Cognition and communication, at the core of human speech rhythm, do not leave a fossil record. However, if the purpose is to understand the origin and evolution of speech rhythm, alternative methods are available. A powerful tool is comparative approach: studying the presence or absence of cognitive/behavioral traits in other species, drawing conclusions on which traits are shared between species, and which are recent human inventions. Here we apply this approach to traits related to human speech rhythm. Many species exhibit temporal structure in their vocalizations but little is known about the range of rhythmic structures perceived and produced, their biological and developmental bases, and communicative functions. We review the literatures on human and non-human studies of rhythm in speech and animal vocalizations to survey similarities and differences. We report important links between vocal perception and motor coordination, and the differentiation of rhythm based on hierarchical temporal structure. We extend this review to quantitative techniques useful for computing rhythmic structure in acoustic sequences and hence facilitating cross-species research. While still far from a full comparative cross-species perspective of speech rhythm, we are closer to fitting missing pieces of the puzzle.

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Automated classification of dolphin echolocation click types from the Gulf of Mexico

Cited by 55 publications

References 41 publications

Habitat use of a coastal delphinid population investigated using passive acoustic monitoring

Habitat use of a coastal delphinid population investigated using passive acoustic monitoring

Description and classification of echolocation clicks of Indian Ocean humpback (Sousa plumbea) and Indo-Pacific bottlenose (Tursiops aduncus) dolphins from Menai Bay, Zanzibar, East Africa

Evolution of speech rhythm: a cross-species perspective

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