Trends in Ecology & Evolution
ReviewSexual competition among females: What causes courtship-role reversal?
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2020, Advances in the Study of BehaviorCitation Excerpt :Sex role reversal is characterized by choosy males and aggressive, competitive, and polygamous females (Andersson, 1994; Eens & Pinxten, 2000). The primary ecological driver of sex role reversal is a shift in the OSR in favor of females; this happens when males become the reproductively limiting resource, usually as a result of increased male reproductive investment, causing in turn a decrease in male PRR (Eens & Pinxten, 2000; Gwynne, 1991; Parker & Simmons, 1996). Among pipefishes (Syngnathidae), for example, whereas females furnish males with eggs but engage in no further reproductive investment, males brood developing embryos, exchange nutrients with offspring, and experience resource limitations of time and energy (Rosenqvist & Berglund, 2011).
Getting ready for mating: The importance of male touching as an accelerator of ovarian growth in a caridean shrimp
2018, ZoologyCitation Excerpt :In this context, inhibitory interactions may be a way to delay sexual maturity in juveniles and reduce intrasexual competition. However, information on whether juveniles grow up isolated or in contact with adults and on the operational sex ratio of the species in its natural environment would be necessary to confirm this (Gwynne, 1991; Kraus et al., 1999). The stimulatory effect of males and the inhibitory effect of females on ovarian maturation may be potentiated in nature by the nearby presence of other males or females, respectively, due to the gregarious behavior of N. davidi.