Behavioral laterality in Yangtze finless porpoises ( Neophocaena asiaeorientalis asiaeorientalis )

Platto, Sara; Zhang, Chendi; Pine, Matthew K.; Wei, Feng; Yang, Lu; Irwin, Alicia E.; Wang, D.

doi:10.1016/j.beproc.2017.04.015

Cited by 8 publications

(7 citation statements)

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“…Note however the deep occlusion facets and lack of any heel on the crowns of posterior maxillary teeth in Kwanzacetus khoisani , two significant differences with I. geoffrensis . In this context of potential partial ecological overlap, the asymmetric development of the left occipital protuberance observed in both I. geoffrensis and K. khoisani may indicate a similar degree of behavioral motor asymmetry (or laterality), a phenomenon reported in many cetaceans (review in Platto et al, 2017 ). Interestingly, although no clear correlation has been demonstrated with laterality, four species of freshwater dolphins, including I. geoffrensis , have been reported performing side-swimming ( Renjun et al, 1994 ; Platto et al, 2017 ).…”

Section: Discussionmentioning

confidence: 80%

“…In this context of potential partial ecological overlap, the asymmetric development of the left occipital protuberance observed in both I. geoffrensis and K. khoisani may indicate a similar degree of behavioral motor asymmetry (or laterality), a phenomenon reported in many cetaceans (review in Platto et al, 2017 ). Interestingly, although no clear correlation has been demonstrated with laterality, four species of freshwater dolphins, including I. geoffrensis , have been reported performing side-swimming ( Renjun et al, 1994 ; Platto et al, 2017 ). The preference for one side during swimming and/or feeding may explain the presence of a larger left occipital protuberance, for stronger neck muscles (M. semispinalis capitis or rectus capitis posterior major), presumably also present in the last common ancestor of I. geoffrensis and K. khoisani .…”

Section: Discussionmentioning

confidence: 80%

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A close relative of the Amazon river dolphin in marine deposits: a new Iniidae from the late Miocene of Angola

Lambert

Auclair

Cauxeiro

et al. 2018

PeerJ

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BackgroundA few odontocetes (echolocating toothed cetaceans) have been able to independently colonize freshwater ecosystems. Although some extant species of delphinids (true dolphins) and phocoenids (porpoises) at least occasionally migrate upstream of large river systems, they have close relatives in fully marine regions. This contrasts with the three odontocete families only containing extant species with a strictly freshwater habitat (Iniidae in South America, the recently extinct Lipotidae in China, and Platanistidae in southeast Asia). Among those, the fossil record of Iniidae includes taxa from freshwater deposits of South America, partly overlapping geographically with the extant Amazon river dolphin Inia geoffrensis, whereas a few marine species from the Americas were only tentatively referred to the family, leaving the transition from a marine to freshwater environment poorly understood.MethodsBased on a partial odontocete skeleton including the cranium, discovered in late Miocene (Tortonian-Messinian) marine deposits near the estuary of the Cuanza River, Angola, we describe a new large iniid genus and species. The new taxon is compared to other extinct and extant iniids, and its phylogenetic relationships with the latter are investigated through cladistic analysis.Results and DiscussionThe new genus and species Kwanzacetus khoisani shares a series of morphological features with Inia geoffrensis, including the combination of a frontal boss with nasals being lower on the anterior wall of the vertex, the laterally directed postorbital process of the frontal, the anteroposterior thickening of the nuchal crest, and robust teeth with wrinkled enamel. As confirmed (although with a low support) with the phylogenetic analysis, this makes the new taxon the closest relative of I. geoffrensis found in marine deposits. The geographic provenance of K. khoisani, on the eastern coast of South Atlantic, suggests that the transition from the marine environment to a freshwater, Amazonian habitat may have occurred on the Atlantic side of South America. This new record further increases the inioid diversity during the late Miocene, a time interval confirmed here as the heyday for this superfamily. Finally, this first description of a Neogene cetacean from inland deposits of western sub-Saharan Africa reveals the potential of this large coastal area for deciphering key steps of the evolutionary history of modern cetaceans in the South Atlantic.

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 80%

A close relative of the Amazon river dolphin in marine deposits: a new Iniidae from the late Miocene of Angola

Lambert

Auclair

Cauxeiro

et al. 2018

PeerJ

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“…Laterality has been reported in captive Yangtze narrow-ridged nless porpoises 17 , where all 6 porpoises studied showed a strong tendency to swim around the tank in a clockwise direction. Weaker laterality was observed in the direction of the barrel roll and the side-swimming posture.…”

Section: Discussionmentioning

confidence: 79%

Population-Level Laterality In Foraging Finless Porpoises

Amano

Kawano

Kubo

et al. 2021

Preprint

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Laterality has been reported in many vertebrates, and asymmetrical cerebral hemisphere function has been hypothesized to cause a left-bias in social behavior and a right-bias in feeding behavior. In this paper, we provide the first report of behavioral laterality in free-ranging finless porpoises, which seemingly supports the aforementioned hypothesis. We observed the turning behavior of finless porpoises in Omura Bay, Japan, using land-based and unmanned aerial system observations. We found a strong tendency in finless porpoises to turn counterclockwise with their right side down when pursuing and catching fish at the surface of the water. Our results suggest that this population of finless porpoises shows consistent right-biased laterality. Right-biased laterality has been observed in various foraging cetaceans and is usually explained by the dominance of the right eye-left cerebral hemisphere in prey recognition; however, right-biased laterality in foraging cetaceans may have multiple causes.

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“…Previous research on cetacean species other than bottlenose dolphins generally confirms the right-eye visual advantage, especially during feeding (e.g., Karenina et al, 2016). However, several studies have found a lack of species-level laterality for other species, such as belugas, Pacific white-sided dolphins, and Yangtze finless porpoises (Neophocaena asiaeorientalis asiaeorientalis; Platto et al, 2017;Yeater et al, 2014). The roughtoothed dolphins in the present study did not display significant laterality at the group level, although, M$ descriptively, the left eye was used more than the right eye in the moving, unpredictable condition.…”

Section: Discussionmentioning

confidence: 92%

Laterality of Eye Use by Bottlenose (Tursiops truncatus) and Rough-Toothed (Steno bredanensis) Dolphins While Viewing Predictable and Unpredictable Stimuli

Lilley¹,

Vere²,

Yeater³

2020

IJCP

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Laterality of eye use has been increasingly studied in cetaceans. Research supports that many cetacean species keep prey on the right side while feeding and preferentially view unfamiliar objects with the right eye. In contrast, the left eye has been used more by calves while in close proximity to their mothers. Despite some discrepancies across and within species, laterality of eye use generally indicates functional specialization of brain hemispheres in cetaceans. The present study aimed to examine laterality of eye use in bottlenose dolphins (Tursiops truncatus) and rough-toothed dolphins (Steno bredanensis) under managed care. Subjects were video-recorded through an underwater window while viewing two different stimuli, one predictable and static and the other unpredictable and moving. Bottlenose dolphins displayed an overall right-eye preference, especially while viewing the unpredictable, moving stimulus. Rough-toothed dolphins did not display eye preference while viewing stimuli. No significant correlations between degree of laterality and behavioral interest in the stimuli were found. Only for bottlenose dolphins were the degree of laterality and curiosity ratings correlated. This study extends research on cetacean lateralization to a species not extensively examined and to stimuli that varied in movement and degree of predictability. Further research is needed to make conclusions regarding lateralization in cetaceans.

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Behavioral laterality in Yangtze finless porpoises ( Neophocaena asiaeorientalis asiaeorientalis )

Cited by 8 publications

References 93 publications

A close relative of the Amazon river dolphin in marine deposits: a new Iniidae from the late Miocene of Angola

A close relative of the Amazon river dolphin in marine deposits: a new Iniidae from the late Miocene of Angola

Population-Level Laterality In Foraging Finless Porpoises

Laterality of Eye Use by Bottlenose (Tursiops truncatus) and Rough-Toothed (Steno bredanensis) Dolphins While Viewing Predictable and Unpredictable Stimuli

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