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Spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus).

Morisaka T, Sakai M, Kogi K, Nakasuji A, Sakakibara K, Kasanuki Y, Yoshioka M - PLoS ONE (2013)

Bottom Line: Spontaneous ejaculation, which is defined as the release of seminal fluids without apparent sexual stimulation, has been documented in boreoeutherian mammals.Here we report spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus), and present a video of this rare behavior.This is the first report of spontaneous ejaculation by an aquatic mammal, and the first video of this behavior in animals to be published in a scientific journal.

View Article: PubMed Central - PubMed

Affiliation: Wildlife Research Center of Kyoto University, Kyoto, Japan.

ABSTRACT
Spontaneous ejaculation, which is defined as the release of seminal fluids without apparent sexual stimulation, has been documented in boreoeutherian mammals. Here we report spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus), and present a video of this rare behavior. This is the first report of spontaneous ejaculation by an aquatic mammal, and the first video of this behavior in animals to be published in a scientific journal.

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Related in: MedlinePlus

Spontaneous ejaculation by a wild Indo-Pacific bottlenose dolphin off Mikura Island, Japan.(A) Dense seminal fluid was ejaculated from the tip of the penis with initial contraction of the peduncle muscle downward. (B) A few seconds after the first ejaculation of seminal fluid, the remaining seminal fluid was ejaculated for 0.86 s (26 frames at (1/30 s)/frame).
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pone-0072879-g001: Spontaneous ejaculation by a wild Indo-Pacific bottlenose dolphin off Mikura Island, Japan.(A) Dense seminal fluid was ejaculated from the tip of the penis with initial contraction of the peduncle muscle downward. (B) A few seconds after the first ejaculation of seminal fluid, the remaining seminal fluid was ejaculated for 0.86 s (26 frames at (1/30 s)/frame).

Mentions: Dolphin #266 was first filmed with another male (ID number #557; 11 years old), neither of which had an erect penis. At the time, neither #266 nor #557 was moving their peduncle flukes and both were swimming by inertia. The left eye of #557 was closed. Ten seconds later, #266 was filmed again with a fully erect penis without peduncle fluke movement, and with a closed left eye. The eye opened at 3.2 s (96 frames at (1/30 s)/frame) before spontaneous ejaculation. #266 seemed to move his peduncle flukes gently downward 1 s before spontaneous ejaculation. Spontaneous ejaculation lasted 0.43 s (13 frames at (1/30 s)/frame) with the contraction of the peduncle muscle downward and dense seminal fluid being ejaculated from the tip of the penis (Figure 1A and Video S1). The dolphin stretched his peduncle muscle upward and a few seconds later the remaining seminal fluid was ejaculated, lasting 0.73 s (22 frames at (1/30 s)/frame) (Figure 1B and Video S1). After ejaculation, the dolphin gently swam away.


Spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus).

Morisaka T, Sakai M, Kogi K, Nakasuji A, Sakakibara K, Kasanuki Y, Yoshioka M - PLoS ONE (2013)

Spontaneous ejaculation by a wild Indo-Pacific bottlenose dolphin off Mikura Island, Japan.(A) Dense seminal fluid was ejaculated from the tip of the penis with initial contraction of the peduncle muscle downward. (B) A few seconds after the first ejaculation of seminal fluid, the remaining seminal fluid was ejaculated for 0.86 s (26 frames at (1/30 s)/frame).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3755988&req=5

pone-0072879-g001: Spontaneous ejaculation by a wild Indo-Pacific bottlenose dolphin off Mikura Island, Japan.(A) Dense seminal fluid was ejaculated from the tip of the penis with initial contraction of the peduncle muscle downward. (B) A few seconds after the first ejaculation of seminal fluid, the remaining seminal fluid was ejaculated for 0.86 s (26 frames at (1/30 s)/frame).
Mentions: Dolphin #266 was first filmed with another male (ID number #557; 11 years old), neither of which had an erect penis. At the time, neither #266 nor #557 was moving their peduncle flukes and both were swimming by inertia. The left eye of #557 was closed. Ten seconds later, #266 was filmed again with a fully erect penis without peduncle fluke movement, and with a closed left eye. The eye opened at 3.2 s (96 frames at (1/30 s)/frame) before spontaneous ejaculation. #266 seemed to move his peduncle flukes gently downward 1 s before spontaneous ejaculation. Spontaneous ejaculation lasted 0.43 s (13 frames at (1/30 s)/frame) with the contraction of the peduncle muscle downward and dense seminal fluid being ejaculated from the tip of the penis (Figure 1A and Video S1). The dolphin stretched his peduncle muscle upward and a few seconds later the remaining seminal fluid was ejaculated, lasting 0.73 s (22 frames at (1/30 s)/frame) (Figure 1B and Video S1). After ejaculation, the dolphin gently swam away.

Bottom Line: Spontaneous ejaculation, which is defined as the release of seminal fluids without apparent sexual stimulation, has been documented in boreoeutherian mammals.Here we report spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus), and present a video of this rare behavior.This is the first report of spontaneous ejaculation by an aquatic mammal, and the first video of this behavior in animals to be published in a scientific journal.

View Article: PubMed Central - PubMed

Affiliation: Wildlife Research Center of Kyoto University, Kyoto, Japan.

ABSTRACT
Spontaneous ejaculation, which is defined as the release of seminal fluids without apparent sexual stimulation, has been documented in boreoeutherian mammals. Here we report spontaneous ejaculation in a wild Indo-Pacific bottlenose dolphin (Tursiops aduncus), and present a video of this rare behavior. This is the first report of spontaneous ejaculation by an aquatic mammal, and the first video of this behavior in animals to be published in a scientific journal.

Show MeSH
Related in: MedlinePlus