C. A. Domesticus: A Case Study

Decent Essays
With increased competition for a female, males chirp more to outcompete their rival (Callander et al., 2013). However, some male A.domesticus do not depend on calls to attract females. Instead they remain silent and intercept their rival’s songs, when a female is present (Callander et al., 2013). This however, has proven to be unsuccessful in mating success, as studies have shown that calling is necessary for reproductive success (Nelson & Nolen, 1997; Wagner & Reiser, 1999). These non-calling males may also be unable to produce calls based on their physiology, or due to choosing to avoid predation risks, energy costs and aggressive encounters with rivals, over reproduction (Nelson & Nolen, 1997).
Female A.domesticus have also been observed to choose their mate based on their own predation risk (Hedrick, 1999). Increased chirping frequency and minimal latency is preferred by female A.domesticus, however, there is a high chance that the male cricket would provide locational information to possible predators (Hedrick, 1999). Thus males must regulate their calling latency and frequency to optimise reproductive attraction and success, while maintaining safety. According to Hardy & Shaw (1983), A.domesticus are able to differentiate genders via bodily contact and pheromones, and do not need to rely on calls to attract conspecific females.
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The present study aims to combine these two behavioural changes, to determine whether sex ratios have an effect on the song latency and frequency of male cricket calls, with a simulated predator presence. Based on previous literature, it was hypothesised that with increased competition for mates, represented by sex ratios, males would chirp sooner and more frequently despite the threat of predation, to increase their reproductive
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