Understanding latitudinal trends in fish body size through models of optimal seasonal energy allocation
Understanding latitudinal trends in fish body size through models of optimal seasonal energy allocation
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DOI：
10.1139/f03-083
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发表时间：
2003-08-01
影响因子：
2.4
通讯作者：
Marschall, EA
中科院分区：
文献类型：
--
作者：
Garvey, JE;Marschall, EA
对于高纬度地区的鱼类来说，短的生长季节应该限制年龄大小，尽管匡威的情况经常发生。我们使用了一个动态的状态变量模型，以找到能量分配策略的长度，脂肪和卵巢，最大限度地提高预期产蛋的大口黑鲈（Micropterus salmoides）。我们确定了纬度和口粮如何影响最优分配，然后使用最优策略模拟增长。理论上的互惠移植探讨了特定纬度的最佳策略如何影响其他纬度的增长。在低口粮，分配和增长是相似的纬度，长度选择在小的个人和生殖组织和脂肪在大的同行。在高口粮，低纬度的鱼投入最多的能量长度和繁殖，高纬度的鱼分配到长度在夏季和脂肪在秋季和发展卵巢在今年早些时候。移植显示，较小的尺寸在年龄发生在北方比在南方，符合现场模式大口鲈鱼。虽然北方的策略使鱼类在南方获得成功，但南方的策略在北方却不成功。特定的能量适应可能会损害鱼类移植到其本土分布之外的成功。
For fish at high latitudes, short growing seasons should constrain size-at-age, although the converse often occurs. We used a dynamic state variable model to find energy allocation strategies to length, fat, and ovaries that maximize expected egg production of largemouth bass (Micropterus salmoides). We determined how latitudes and rations affect optimal allocation and then simulated growth using optimal strategies. A theoretical reciprocal transplant explored how latitude-specific optimal strategies affected growth at other latitudes. At low ration, allocation and growth were similar among latitudes, with length selected in small individuals and reproductive tissue and fat in large counterparts. At high rations, low-latitude fish invested most energy to length and reproduction; high-latitude fish allocated to length during summer and fat during fall and developed ovaries earlier in the year. Transplants revealed that smaller size-at-age occurs in the north than in the south, consistent with field patterns for largemouth bass. Although northern strategies allowed fish to be successful in the south, southern strategies were unsuccessful in the north. Latitude-specific energetic adaptations may compromise success of fish transplanted beyond their native distribution.