Whistle Production Pre- and Post-Partum in Bottlenose Dolphins (&lt;I&gt;Tursiops truncatus&lt;/I&gt;) in Human Care

Mello, I. Froilano de; Amundin, Mats

doi:10.1578/am.31.2.2005.169

Cited by 20 publications

(31 citation statements)

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“…With the use of a hydrophone array and acoustic localization we were able to show that copying did not occur and that the elevation in postpartum signature whistle rate was due to the mothers calling more. We should also note that we observed no increase in prepartum signature whistle use as suggested in another study (Mello and Amundin ).…”

Section: Terms Used To Describe the Proximity Of The Mothers In Relatsupporting

confidence: 87%

“…Earlier studies provided some insight into maternal whistle production of bottlenose dolphins immediately following the birth of a calf in marine mammal facilities (Mello and Amundin , Fripp and Tyack ). Fripp and Tyack () reported that maternal signature whistle production increased 10 fold immediately after calves were born until the third week postpartum.…”

Section: Terms Used To Describe the Proximity Of The Mothers In Relatmentioning

confidence: 99%

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Further insights into postpartum signature whistle use in bottlenose dolphins (Tursiops truncatus)

King¹,

Guarino²,

Donegan³

et al. 2016

Marine Mammal Science

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Section: Terms Used To Describe the Proximity Of The Mothers In Relatsupporting

confidence: 87%

Section: Terms Used To Describe the Proximity Of The Mothers In Relatmentioning

confidence: 99%

Further insights into postpartum signature whistle use in bottlenose dolphins (Tursiops truncatus)

King¹,

Guarino²,

Donegan³

et al. 2016

Marine Mammal Science

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“…However, other studies focusing on signature whistles have found that whistle duration (and number of inflection points) increases with age (Caldwell & Caldwell, 1979;Caldwell et al, 1990). The differences in duration observed could therefore also be explained by increased rates of signature whistle production by adult animals, possibly mothers during separations from their offspring in the mother-calf groups (Mello & Amundin, 2005;Sayigh et al, 1990;Smolker, Mann, & Smuts, 1993). As in other studies (Hawkins & Gartside, 2010), calf presence in this population is highly correlated with group size, with calves being present in larger groups (Kriesell et al, 2014).…”

Section: Discussionsupporting

confidence: 56%

Changes in bottlenose dolphin whistle parameters related to vessel presence, surface behaviour and group composition

et al. 2016

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Cetacean watching from tour boats has increased in recent years and has been promoted as an ethically viable alternative to cetacean viewing in captive facilities or directed take. However, short-and long-term impacts of this industry on the behaviour and energetic expenditure of cetaceans have been documented. Although multiple studies have investigated the acoustic 1 response of dolphins to marine tourism, there are several covariates that could also explain some of these results and should be considered simultaneously. Here, we investigated whether common bottlenose dolphins, Tursiops truncatus, inhabiting Walvis Bay, Namibia vary their whistle parameters in relation to boat presence, surface behaviour and/or group composition. We detected an upward shift of up to 1.99 kHz in several whistle frequency parameters when dolphins were in the presence of one or more tour boats and the research vessel. No changes were demonstrated in the frequency range, number of inflection points or duration of whistles. A similar, although less pronounced difference was observed in response to engine noise generated by the research vessel when idling, suggesting that noise alone plays an important role in driving this shift in whistle frequency. Additionally, a strong effect of surface behaviour was observed, with the greatest difference in whistle parameters detected between resting and other behavioural states that are associated with higher degrees of emotional arousal. Group composition also contributed to the variation observed, with the impact of boats dependent on whether calves were present or not. Overall these results demonstrate high natural variation in the frequency parameters of whistles utilized by dolphins over varying behavioural states and group composition. Anthropogenic impact in the form of marine tour boats can influence the vocalization parameters of dolphins and such changes could have a long-term impact if they reduce the communication range of whistles or increase energy expenditure. Key wordsbottlenose dolphin, marine tourism, Namibia, Tursiops truncatus, vocal behaviour Wildlife tourism involving cetacean (whale, dolphin and porpoise) watching has experienced rapid growth since the 1990s (Hoyt, 2001;O'Connor, Campbell, Cortez, & Knowles, 2009). 2Globally, boat-based cetacean watching generates an estimated 2.2 billion US dollars annually (IWC, 2014). Revenue can provide a valuable subsidy to fishing communities and in some cases wild cetacean viewing has replaced direct hunting of whales and dolphins (Amir & Jiddawi, 2001;Berggren et al., 2007). Compared with captive facilities, responsible boatbased cetacean watching has been promoted as an ethically acceptable option for observing dolphins, providing a valuable forum for environmental education and promotion of conservation efforts (IFAW, 1997). However, a considerable body of work has shown that boats and boat-based cetacean watching can have multiple negative impacts on the behaviour of the focal individual, population or species (Parsons,...

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“…Coupling of sounds from the water may allow the fetus to hear its mother and nearby animals within the group. The developing cetacean inside the womb may hear a wide range of sounds long before it is born (Mello and Amundin ). This could be an advantage for cetaceans that live in groups compared to solitary species.…”

Section: Discussionmentioning

confidence: 99%

Delphinid brain development from neonate to adulthood with comparisons to other cetaceans and artiodactyls

Ridgway

Carlin

Alstyne

2017

Marine Mammal Science

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Why do neonatal and adult delphinids have much larger brains than artiodactyls when they have common ancestors? We explore relationships between neonatal brain size, gestation duration, maternal body mass, and body growth. Cetacean brains grow fast in the womb and longer gestation results in a larger brain. Allometry shows that the larger the mother's body mass, the larger the neonatal brain. After birth, delphinid bodies grow much faster than brains, and the index of encephalization decreases even as brains grow beyond maturity. Delphinids' larger brain growth during life at sea may be explained by at least three differences from artiodactyls' life on land. First, the sea offers high calorie prey to support growth of a large brain. Second, life in water offers relief from gravity, allowing for a large head to contain a large brain. Third, sound in water may pass through an immersed body. This allows sounds from the water to reach the fetus, driving early development of delphinoid auditory brain parts. As an example of this, the dolphin ear bone is very large at birth. Furthermore, the auditory nervous system appears mature well before birth. Compared with artiodactyls, these three differences likely result in a larger delphinid brain.

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Whistle Production Pre- and Post-Partum in Bottlenose Dolphins (<I>Tursiops truncatus</I>) in Human Care

Cited by 20 publications

References 0 publications

Further insights into postpartum signature whistle use in bottlenose dolphins (Tursiops truncatus)

Further insights into postpartum signature whistle use in bottlenose dolphins (Tursiops truncatus)

Changes in bottlenose dolphin whistle parameters related to vessel presence, surface behaviour and group composition

Delphinid brain development from neonate to adulthood with comparisons to other cetaceans and artiodactyls

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