AI Article Synopsis
- The study examined the reproductive biology and adaptability of the invasive amphipod species Crangonyx floridanus in Japan, focusing on both field observations and laboratory experiments.
- Researchers found that egg-bearing individuals are present year-round, showcasing an efficient reproductive system with fast egg maturation and high egg counts.
- The species is also highly adaptable to various water temperatures, thriving in a range from 4 to 20 degrees Celsius, and even surviving up to 30 degrees, contributing to its rapid population growth and spread in Japan.
Article Abstract
We studied the reproductive biology and adaptability of the alien freshwater crangonyctid amphipod Crangonyx floridanus, currently inhabiting a large portion of Japan, both in the field and under controlled laboratory conditions. In the Chikuma River population of this alien amphipod, egg-bearing individuals were found throughout the year. In terms of egg maturation cycle, egg development (during embryogenesis), and egg count per ovipositional cycle, these amphipods display a very efficient reproductive system. This study also established their adaptability to a wide range of water temperatures (primarily 4-20 degrees C, however in some cases, these individuals are able to survive at up to 30 degrees C). C. floridanus's strong capacity to adapt to broad and variable environmental conditions is certainly contributing to its high rate of population increase, and rapid dispersion throughout Japan.
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| http://dx.doi.org/10.2108/zsj.27.522 | DOI Listing |
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