Reproductive Ability of Elderly Male Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) in Captivity

Koga, Sotaro; Yanagisawa, Makio; Koga, Haruka; Kawazu, Isao; Tokutake, Kouji; Funasaka, Noriko; Yoshioka, Motoi; Miyahara, Hirokazu

doi:10.3106/ms2018-0044

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…The dolphins will overlap each other's backs, as shown in Figure 10, and the dolphin's reproductive organs will protrude. This observation coincided with the peak of serum testosterone in male dolphins during March [30], which led to relatively higher behavior occurrences. Reproductive behavior was found in 5 observation times.…”

Section: Reproductive Behaviorsupporting

confidence: 64%

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Rehabilitation of captive Indo-Pacific bottlenose dolphin (Tursiops aduncus) as a way to combat the effects of climate change

Josephine,

Adriani,

Mujiyanto

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Climate change caused by human industrialization is an unavoidable global problem which started in the 20th century. The high concentration of greenhouse gases has caused global warming, natural disaster, rising sea level, and threatened marine wildlife. It has been proven to decrease the survival rate of dolphins by 12%. This research aims to describe the behavior and assess the readiness to release rehabilitated Tursiops aduncus in Umah Lumba, Banyuwedang Bay, Bali, to boost the wild dolphin population. Visual observation was made on three individuals: Rambo, Rocky and Johnny, at Umah Lumba, Banyuwedang Bay Bali, on March 2021, who have been in the rehabilitation facility since September 2019. The three individuals can be identified by the physical characteristics of their head, mandible, and dorsal fin. The dolphins have developed nine wild-dolphin-like behaviors: respiratory, exploratory, resting, reproductive, social, predatory, spy-hopping, tail-clapping, and sneezing. This rehabilitation program is essential because it increases the population of wild dolphins by acclimating, adapting, and training former captive dolphins for release.

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Section: Reproductive Behaviorsupporting

confidence: 64%

“…Reproductive behavior : Similar to wild dolphins, captive dolphins also perform reproductive behavior. Serum testosterone in Tursiops aduncus in captivity began to increase in January and peaked from March to May [30].…”

Section: Resting Behaviormentioning

confidence: 99%

Rehabilitation of captive Indo-Pacific bottlenose dolphin (Tursiops aduncus) as a way to combat the effects of climate change

Josephine,

Adriani,

Mujiyanto

2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…These high levels were consistent with the breeding season of their male conspecifics in the same population (from March to August) (Brook 1997) and another captive population (from January to September) (Koga et al . 2019), and mating conceptions were mostly observed during this period (Fig. 3).…”

Section: Discussionmentioning

confidence: 86%

“…While the hormone concentration patterns in male T. aduncus was reported well (Yuen 2007; Koga et al . 2019), the hormone concentration pattern in the female dolphins is still unknown, leaving a crucial gap in the endocrine knowledge for this species.…”

Section: Introductionmentioning

confidence: 99%

Sexual maturity, seasonal estrus, and gestation in female Indo‐Pacific bottlenose dolphins Tursiops aduncus inferred from serum reproductive hormones

Zhang

Wei

Hui³

et al. 2020

Integr. Zool.

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Reproductive hormones in serum concentrations of progesterone, estradiol, and testosterone in female Indo-Pacific bottlenose dolphins (Tursiops aduncus, n = 12) housed in Ocean Park Hong Kong were investigated in the present study. Results showed that, onset of puberty of captive Indo-Pacific bottlenose dolphins was at 5 years while sexual maturity was at 6. Average serum progesterone concentrations in non-pregnant sexually mature individuals was 0.33 (0.25-0.97) ng/mL (interquartile), significantly higher than in immature ones 0.26 (0.25-0.38) ng/mL. This study found significant difference in serum estradiol concentrations between individuals at the onset of puberty (9.5 ± 1.7 pg/mL, ±SD) and not (below detection limit 9 pg/mL). A slightly seasonal breeding pattern, with progesterone values tend to be higher from February to October (0.38 [0.25-1.07] ng/mL) was inferred. During pregnancy, serum progesterone concentrations range from 10.54 ± 8.74 ng/mL (indexed month post-conception [IMPC] 0) to 25.49 ± 12.06 ng/mL (IMPC 2), and display a bimodal pattern with 2 peaks in early-(25.49 ± 12.06 ng/mL, IMPC 2) and late-pregnancy (21.71 ± 10.25 ng/mL, IMPC 12), respectively. Serum estradiol concentrations can seldom be detected in early-pregnancy and increase constantly in mid-(9.45 ± 1.83 pg/mL) and late-pregnancy (11.88 ± 3.81 pg/mL), with a spike (15.45 ± 6.78 pg/mL) 1 month prior to delivery. Serum testosterone concentrations elevate significantly in IMPC 7 (0.36 ± 0.10 ng/mL) compared to other months (0.16 ± 0.10 ng/mL) of the year. The present study provides normal concentration profiles for some reproductive hormones in female Indo-Pacific bottlenose dolphins and can contribute to the breeding monitoring of this species. Also, our study would shed further light on the reproductive physiology of small cetaceans.

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“…For example, according to a 2019 report (Valdivia et al, 2019), of 62 marine mammal and sea turtle species, 18 mammal (78%) and six turtle (75%) populations increased after being listing by the United States Endangered Species Act (ESA), while two marine mammal (9%) populations declined and three mammal (13%) and two turtle (25%) populations showed no change after ESA protection. And while some marine mammal species breed well in captivity [e.g., bottlenose dolphin (Tursiops truncatus) (Jaakkola and Willis, 2019), Indo-Pacific bottlenose dolphins (Tursiops aduncus) (Koga et al, 2019)], which can be a hedge against extinction in the wild, most do not. Thus, life history data from captive bred and wild animals are important for risk modeling, although it is limited for most marine mammal species (Davidson et al, 2012;IUCN, 2020).…”

Section: Introductionmentioning

confidence: 99%

Life Expectancy in Marine Mammals Is Unrelated to Telomere Length but Is Associated With Body Size

et al. 2021

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Marine mammals vary greatly in size and lifespan across species. This study determined whether measures of adult body weight, length and relative telomere length were related to lifespan. Skin tissue samples (n = 338) were obtained from 23 marine mammal species, including four Mysticeti, 19 Odontoceti and one dugong species, and the DNA extracted to measure relative telomere length using real-time PCR. Life span, adult body weight, and adult body length of each species were retrieved from existing databases. The phylogenetic signal analysis revealed that body length might be a significant factor for shaping evolutionary processes of cetacean species through time, especially for genus Balaenoptera that have an enormous size. Further, our study found correlations between lifespan and adult body weight (R2 = 0.6465, p < 0.001) and adult body length (R2 = 0.6142, p ≤0.001), but no correlations with relative telomere length (R2 = −0.0476, p = 0.9826). While data support our hypothesis that larger marine mammals live longer, relative telomere length is not a good predictor of species longevity.

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Reproductive Ability of Elderly Male Indo-Pacific Bottlenose Dolphins (Tursiops aduncus) in Captivity

Cited by 4 publications

References 6 publications

Rehabilitation of captive Indo-Pacific bottlenose dolphin (Tursiops aduncus) as a way to combat the effects of climate change

Rehabilitation of captive Indo-Pacific bottlenose dolphin (Tursiops aduncus) as a way to combat the effects of climate change

Sexual maturity, seasonal estrus, and gestation in female Indo‐Pacific bottlenose dolphins Tursiops aduncus inferred from serum reproductive hormones

Life Expectancy in Marine Mammals Is Unrelated to Telomere Length but Is Associated With Body Size

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