Deltamethrin is a widespread environmental hormone with endocrine-disrupting properties, but its effect on embryonic development of reptiles is largely unexplored. We investigated the effects of deltamethrin on embryo...Deltamethrin is a widespread environmental hormone with endocrine-disrupting properties, but its effect on embryonic development of reptiles is largely unexplored. We investigated the effects of deltamethrin on embryonic development and offspring traits in two turtle species, one with parchment-shelled eggs and the other with rigidshelled eggs. Deltamethrin exposure during egg incubation did not affect hatching success and hatchling body size in either species. However, embryonic exposure to deltamethrin resulted in reduced hatchling locomotor performance in the red-eared slider turtle（Trachemys scripta） with parchment-shelled eggs, but not in the Chinese three-keeled pond turtle（Chinemys reevesii） with rigid-shelled eggs. These results suggest that parchment-shelled eggs are likely more vulnerable to deltamethrin than rigid-shelled eggs.展开更多
A total of 51 Chinese three-keeled pond turtle Chinemys reevesii egg s were incubated on wet and dry substrates (water potentials of -12 kPa and -3 00 kPa, respectively) at 30 ℃ to assess the influence of the hydric ...A total of 51 Chinese three-keeled pond turtle Chinemys reevesii egg s were incubated on wet and dry substrates (water potentials of -12 kPa and -3 00 kPa, respectively) at 30 ℃ to assess the influence of the hydric environment s on egg survival and hatchling traits. Eggs incubated in the dry condition lost weight, whereas those incubated in the wet condition did not. The hydric enviro nments did not affect incubation lengths (60 3 vs 60 7 days) as well as ha tching successes (69 2% vs 88 0%). Except for wet body mass and carapace width, which were larger for hatchlings from the -12 kPa treatment than from the -300 kPa tr eatment, the hydric environments did not affect most hatchling traits. These una ffected traits included dry body mass, carapace length, tail length, limb length , hatchling components (carcass, residual yolk and fat bodies), swimming perform ance and critical thermal minimum. In conclusion, within the water potential of -12 to -300 kPa, hydric environments have little effect on embryonic developme nt and hatchling traits in Chinese three-keeled pond turtles .展开更多
文摘Deltamethrin is a widespread environmental hormone with endocrine-disrupting properties, but its effect on embryonic development of reptiles is largely unexplored. We investigated the effects of deltamethrin on embryonic development and offspring traits in two turtle species, one with parchment-shelled eggs and the other with rigidshelled eggs. Deltamethrin exposure during egg incubation did not affect hatching success and hatchling body size in either species. However, embryonic exposure to deltamethrin resulted in reduced hatchling locomotor performance in the red-eared slider turtle（Trachemys scripta） with parchment-shelled eggs, but not in the Chinese three-keeled pond turtle（Chinemys reevesii） with rigid-shelled eggs. These results suggest that parchment-shelled eggs are likely more vulnerable to deltamethrin than rigid-shelled eggs.
文摘A total of 51 Chinese three-keeled pond turtle Chinemys reevesii egg s were incubated on wet and dry substrates (water potentials of -12 kPa and -3 00 kPa, respectively) at 30 ℃ to assess the influence of the hydric environment s on egg survival and hatchling traits. Eggs incubated in the dry condition lost weight, whereas those incubated in the wet condition did not. The hydric enviro nments did not affect incubation lengths (60 3 vs 60 7 days) as well as ha tching successes (69 2% vs 88 0%). Except for wet body mass and carapace width, which were larger for hatchlings from the -12 kPa treatment than from the -300 kPa tr eatment, the hydric environments did not affect most hatchling traits. These una ffected traits included dry body mass, carapace length, tail length, limb length , hatchling components (carcass, residual yolk and fat bodies), swimming perform ance and critical thermal minimum. In conclusion, within the water potential of -12 to -300 kPa, hydric environments have little effect on embryonic developme nt and hatchling traits in Chinese three-keeled pond turtles .
