In the estuary of a river where an endangered species (Clithon retropictum) and an exotic species (Pomacea canaliculata) coexist, we analyze the population characteristics of the two species, the aquatic environmental factors affecting them, and the genetic diversity of (Clithon retropictum) in the ...
In the estuary of a river where an endangered species (Clithon retropictum) and an exotic species (Pomacea canaliculata) coexist, we analyze the population characteristics of the two species, the aquatic environmental factors affecting them, and the genetic diversity of (Clithon retropictum) in the upper and lower sections of weir. a conservation plan was proposed. As a result, the population size of (Clithon retropictum) was larger in the place where there was no exotic species, Pomacea canaliculata, which is judged to be the result of competition for food between the two species in the coexisting place. The riverbed where the two species live is an environment with almost no soil as the bedrock ratio exceeds 50%, and they feed on algae attached to gravel or rocks. the range of the measured environment is water temperature (℃) (22.41±2.05), water depth (cm) (18.14±7.74), pH (10.24±0.07), DO (%) (149.42±31.59), TDS ((g/L) It was 12.86±18.67, salinity (psu) 7.97±15.68, and electrical conductivity (m s) 10.21±9.57. there was no difference in genetic diversity between the upper and lower parts of the weir, which was judged to be the result of the mixing of the upper and lower populations due to the movement of the young at high tide. from the above results, it is judged that the removal of Pomacea canaliculata, which competes for food, is necessary for the conservation of Clithon retropictum in the field because there is no effect of weir on the population and the effect of exotic species is remarkable.
In the estuary of a river where an endangered species (Clithon retropictum) and an exotic species (Pomacea canaliculata) coexist, we analyze the population characteristics of the two species, the aquatic environmental factors affecting them, and the genetic diversity of (Clithon retropictum) in the upper and lower sections of weir. a conservation plan was proposed. As a result, the population size of (Clithon retropictum) was larger in the place where there was no exotic species, Pomacea canaliculata, which is judged to be the result of competition for food between the two species in the coexisting place. The riverbed where the two species live is an environment with almost no soil as the bedrock ratio exceeds 50%, and they feed on algae attached to gravel or rocks. the range of the measured environment is water temperature (℃) (22.41±2.05), water depth (cm) (18.14±7.74), pH (10.24±0.07), DO (%) (149.42±31.59), TDS ((g/L) It was 12.86±18.67, salinity (psu) 7.97±15.68, and electrical conductivity (m s) 10.21±9.57. there was no difference in genetic diversity between the upper and lower parts of the weir, which was judged to be the result of the mixing of the upper and lower populations due to the movement of the young at high tide. from the above results, it is judged that the removal of Pomacea canaliculata, which competes for food, is necessary for the conservation of Clithon retropictum in the field because there is no effect of weir on the population and the effect of exotic species is remarkable.
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