Random Mate Searching: Male Sea Turtle Targets Juvenile for Mating Behavior

  title={Random Mate Searching: Male Sea Turtle Targets Juvenile for Mating Behavior},
  author={Junichi Okuyama and Shiro Kagawa and Nobuaki Arai},
Abstract Here, we report an incidental observation obtained by an animal-borne video logger of courtship behavior by an adult male green turtle (Chelonia mydas) directed toward an immature green turtle. Our result hypothesized that males may select a mating partner mainly using a visual cue based on size, but without high acuity, so that they can distinguish the size of mature females from that of immature turtles. Hence, male turtles may visualize the objects moving underwater that have the… 

Captive green turtles (Chelonia mydas)

It was found that the turtles exhibited a polygynandrous mating system and mated during periods of rising temperatures between 20.3°–26.2° C, indicating that the males may find potential mates not only by visual cues, but potentially also by olfactory stimulation.

The Impact of Temperature-Dependent Sex Determination on the Population Dynamics of Green Sea Turtles (Chelonia mydas)

A novel continuous model is developed to analyze the dynamics of the green sea turtle population longterm and determines the safe operating space for the proportion of eggs that become male at which the population of green sea turtles can exist without going to extinction.

Where Has Turtle Ecology Been, and Where Is It Going?

Abstract Over 9000 articles have been published on turtles and tortoises (excluding sea turtles) since 1950 according to the Web of Science, including over 8000 contained in a personal bibliography

Application of a computer vision technique to animal-borne video data: extraction of head movement to understand sea turtles’ visual assessment of surroundings

A new method of data analysis for animal-borne videos using a computer vision technique referred to as template matching enables researchers to quantitatively extract information regarding vision cognition and behavioral responses in green turtles in the wild that could not otherwise be obtained from other sensors used in previous studies.



Behavioural studies on the green turtle (Chelonia mydas) in the sea

The green turtle, Chelonia mydas, in Queensland: breeding males in the southern Great Barrier Reef

Breeding male green turtles, Chelonia mydas, at any one courtship area in the southern Great Barrier Reef mate with females that will nest on rookeries spread throughout the region, and a higher proportion of males remigrate for additional breeding seasons at 1-2-year intervals.

Ethogram of Immature Green Turtles: Behavioral Strategies for Somatic Growth in Large Marine Herbivores

This work investigated fine-scale behavioral patterns (feeding, resting and other behaviors), microhabitat use and time spent on each behavior for eight immature green turtles using data loggers including: depth, global positioning system, head acceleration, speed and video sensors.


Telemetered males of L. olivacea departed the Gulf of Papagayo by late September, which coincided with a notable decrease in the number of males that were observed in the breeding ground and with the mid-season peak in the numbers of females emerging to lay eggs at Nancite Beach.

Loggerhead Turtles (Caretta caretta) Use Vision to Forage on Gelatinous Prey in Mid-Water

This study uses an animal-borne imaging system and three-dimensional data logger simultaneously to observe the foraging behaviour of large juvenile and adult sized loggerhead turtles in their natural environment and finds that mid-water foraging events share the common feature of a marked deceleration phase associated with the capture and handling of the sluggish prey.

Migratory and reproductive movements of male leatherback turtles (Dermochelys coriacea)

Male migration to and residency in waters adjacent low-latitude nesting beaches in the western Atlantic suggest that this is where mating occurs, and return migration to these areas reveals male fidelity for breeding sites.

Behaviour analysis of the loggerhead sea turtle Caretta caretta from direct in-water observation

Direct observation of animal behaviour is essential for the effective conservation of endangered species in their natural habitat, understanding their function within ecosystems and val- idating

Population genetics and phylogeography of sea turtles

The biogeographic, behavioural, and ecological factors that shape the distribution of genetic diversity in sea turtles are reviewed, including natal homing, maternally inherited markers show strong population structure among nesting colonies while nuclear loci reveal a contrasting pattern of male‐mediated gene flow.

Pre-reproductive Movements of Leatherback Sea Turtles (Dermochelys coriacea) Nesting in the Caribbean

The data suggest that gravid turtles do not arrive from temperate latitudes until just prior to nesting, and that they go directly to a preferred nesting beach rather than nesting opportunistically en route.

Nonparametric regression modelling of green sea turtle growth rates (southern Great Barrier Reef)

Distinct sex-specific growth patterns were found, adults displayed constant negligible growth while inter-annual variability in immature female growth attributable to major oceanographic events was evident, and growth characteristics for green sea turtles resident in the southern Great Barrier Reef foraging grounds were modelled using nonparametrlc regression.