作者
Gail Schofield, Kostas A Katselidis, Martin KS Lilley, Richard D Reina, Graeme C Hays
发表日期
2017
期刊
Functional Ecology
卷号
31
期号
12
页码范围
2310–2319
出版商
Wiley
简介
- Offspring and breeding (operational) sex ratios (OSR) are a key component of demographic studies. While offspring sex ratios are often relatively easy to measure, measuring OSRs is often far more problematic. Yet, highly skewed OSRs, and a lack of male–female encounters, may be an important extinction driver.
- Using loggerhead sea turtles (Caretta caretta) as a case study, we showed the utility of drones, i.e. unmanned aerial vehicles (UAVs), to distinguish adult males and females in a marine breeding area, using a combination of morphological characteristics (tail length) and behavioural differences (active mating, courting and searching by males versus resting by females). Through repeated surveys, we documented seasonal changes in the OSR.
- While the number, and ratio, of males and females on the breeding grounds changed massively, the ratio of receptive females (derived from the rate of influx of …
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G Schofield, KA Katselidis, MKS Lilley, RD Reina… - Functional Ecology, 2017