Comparison of Genetic Structures Among Sympatric, Red-Listed Salt-Marsh Snails in Mainland Japan (Gastropoda: Ellobiidae).

"," "", and are Red-Listed snail species of the family Ellobiidae that co-occur on salt marshes in mainland Japan. Here, we report the genetic diversity and population structures of the former two taxa in comparison with our previous data on for the evaluation of connectivity and conservation values of their local populations. Analyses of 655-bp or 652-bp sequences of the mitochondrial cytochrome oxidase subunit I gene showed the highest genetic diversity and panmictic structure for sp.

Mechanisms that can cause population decline under heavily skewed male-biased adult sex ratios.

While adult sex ratio (ASR) is a crucial component for population management, there is still a limited understanding of how its fluctuation affects population dynamics. To demonstrate mechanisms that hinder population growth under a biased ASR, we examined changes in reproductive success with ASR using a decapod crustacean exposed to female-selective harvesting. We examined the effect of ASR on the spawning success of females.