Fish Ecology and Conservation Physiology Laboratory, Department of Biology, Ottawa-Carleton Institute for Biology, Carleton University, 1125 Colonel By Drive, Ottawa, Ontario K1S 5B6, Canada.
J Fish Biol. 2010 Jan;76(1):280-300. doi: 10.1111/j.1095-8649.2009.02482.x.
The energetic and physiological status of parental smallmouth bass Micropterus dolomieu was investigated across the majority of their latitudinal range at the onset and near the end of care. Variables such as tissue lipid stores, plasma indicators of nutritional status and chronic stress and white muscle were used to define energetic and physiological status. Results showed that northern males (48 degrees N) were larger and heavier than mid-northern (44 degrees N) and southern (36 degrees N) latitude males. For a given body size, northern males had greater whole-body lipid across the parental care period and tended to feed more (based on gut contents) than mid-northern and southern latitude conspecifics. Indicators of nutritional status were also highest in northern males. Conversely, the southern males exhibited the greatest capacity for biosynthesis across the entire parental care period as indicated by the highest level of nucleoside diphosphate kinase activities. Collectively, these finding suggest that the energetic costs and physiological consequences of care vary across latitudes, providing some of the first mechanistic evidence of how environmental conditions can influence both the ecological and physiological costs of reproduction for wild animals during parental care. The data also suggest that lake-specific processes that can vary independently of latitude may be important, necessitating additional research on fish reproductive physiology across landscapes.
研究了在繁殖期开始和接近结束时，亲鱼小口黑鲈（Micropterus dolomieu）在其大部分纬度范围内的能量和生理状态。使用组织脂质储存、营养状况和慢性应激的血浆指标以及白肌等变量来定义能量和生理状态。结果表明，北纬（48 度）的雄性个体比中北纬（44 度）和南纬（36 度）的雄性个体更大、更重。对于给定的体型，整个亲代照顾期间，北方雄性个体的全身脂质含量更高，并且比中北纬和南纬同种个体更倾向于进食（根据肠道内容物）。营养状况的指标在北方雄性个体中也最高。相反，在整个亲代照顾期间，南方雄性个体表现出最高的生物合成能力，这表明核苷二磷酸激酶活性水平最高。总的来说，这些发现表明，照顾的能量成本和生理后果在不同纬度之间存在差异，为环境条件如何影响野生动物在亲代照顾期间繁殖的生态和生理成本提供了一些首批机制证据。这些数据还表明，可能独立于纬度变化的湖泊特定过程很重要，因此需要在景观尺度上对鱼类生殖生理学进行更多研究。
