In this study, the relationship of the growth of invasion fish with water eutrophication processes was explored in Yangtze estuary, China. High water ammonia nitrogen concentration produced high effects on the growth ...In this study, the relationship of the growth of invasion fish with water eutrophication processes was explored in Yangtze estuary, China. High water ammonia nitrogen concentration produced high effects on the growth and survival of mosquitofish Gambusia affinis. When the ammonia nitrogen was higher than 51.75 mg/l, the fish death rate obviously increased with days, and at the 4th day fish presented the highest mortality, while 23.72 mg/l ammonia nitrogen conditions have been able to ensure fish survival for two days in experiment treatment. Therefore, ammonia nitrogen of Grade V polluted water (national water quality criteria) is just 3 mg/l, and the water can be enough to support fish normal survival. Our results suggest mosquitofish was a suitable pioneer species for restoring polluted water ecology and purify water.展开更多
Climate change has been considered a major cause of the increase in the average water temperature of many water systems worldwide and has become a leading factor affecting various ecosystems.The rise in water temperat...Climate change has been considered a major cause of the increase in the average water temperature of many water systems worldwide and has become a leading factor affecting various ecosystems.The rise in water temperature causes a threat to aquatic ecosystems.Most reports focus on assessing the direct impact of water temperature changes on the behavior,physiology,and distribution of aquatic species.This study used experimental models with two small fish species,Japanese medaka(Oryzias latipes)and mosquitofish(Gambusia affinis),which are commonly found living in the same habitat of shallow freshwater,to assess their tolerance to changes in water temperature over a wide temperature range(6-36℃)and their interactions in cohabitation at different temperatures.The results showed that mosquitofish has a better ability to adapt to high water temperature ranges than medaka while medaka adapt better than mosquitofish to low water temperature ranges.In a cohabitation environment,increases in water temperature boosted the mortality of medaka.Observations of the behavior of the two fish species at temperatures of 18 and 28℃ showed that when shifting between these two temperatures,the aggressive behavior of male and female mosquitofish towards male and female medaka changed.In medaka,this change only appeared in males.These findings have important implications for a better understanding of the profound impacts of climate change on species interactions in natural conditions in aquatic ecosystems.展开更多
文摘In this study, the relationship of the growth of invasion fish with water eutrophication processes was explored in Yangtze estuary, China. High water ammonia nitrogen concentration produced high effects on the growth and survival of mosquitofish Gambusia affinis. When the ammonia nitrogen was higher than 51.75 mg/l, the fish death rate obviously increased with days, and at the 4th day fish presented the highest mortality, while 23.72 mg/l ammonia nitrogen conditions have been able to ensure fish survival for two days in experiment treatment. Therefore, ammonia nitrogen of Grade V polluted water (national water quality criteria) is just 3 mg/l, and the water can be enough to support fish normal survival. Our results suggest mosquitofish was a suitable pioneer species for restoring polluted water ecology and purify water.
文摘Climate change has been considered a major cause of the increase in the average water temperature of many water systems worldwide and has become a leading factor affecting various ecosystems.The rise in water temperature causes a threat to aquatic ecosystems.Most reports focus on assessing the direct impact of water temperature changes on the behavior,physiology,and distribution of aquatic species.This study used experimental models with two small fish species,Japanese medaka(Oryzias latipes)and mosquitofish(Gambusia affinis),which are commonly found living in the same habitat of shallow freshwater,to assess their tolerance to changes in water temperature over a wide temperature range(6-36℃)and their interactions in cohabitation at different temperatures.The results showed that mosquitofish has a better ability to adapt to high water temperature ranges than medaka while medaka adapt better than mosquitofish to low water temperature ranges.In a cohabitation environment,increases in water temperature boosted the mortality of medaka.Observations of the behavior of the two fish species at temperatures of 18 and 28℃ showed that when shifting between these two temperatures,the aggressive behavior of male and female mosquitofish towards male and female medaka changed.In medaka,this change only appeared in males.These findings have important implications for a better understanding of the profound impacts of climate change on species interactions in natural conditions in aquatic ecosystems.
