Life history constraints explain negative relationship between fish productivity and dissolved organic carbon in lakes.
Life history constraints explain negative relationship between fish productivity and dissolved organic carbon in lakes.
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生活史的限制解释了鱼类生产力与湖泊中溶解有机碳之间的负相关关系。
DOI：
10.1002/ece3.3108
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发表时间：
2017-08
影响因子：
2.6
通讯作者：
Solomon CT
中科院分区：
文献类型：
--
作者：
Craig N;Jones SE;Weidel BC;Solomon CT
资源的可获得性限制了生物体可用的生活史策略，从而可能限制人口增长率和生产力。我们使用这个概念框架来探索驱动最近报道的鱼类生产力和湖泊中溶解有机碳（DOC）浓度之间的负相关关系的机制。我们研究了一组湖泊中的蓝鳃金龟（蓝鳃金龟）的种群，DOC浓度范围从3到24毫克/升;以前的工作已经证明，初级和次级生产力的食物网是负相关的DOC浓度在这个梯度。对于每个种群，我们量化了个体生长率，成熟年龄，年龄特异性繁殖力，最大年龄，长度-体重和长度-蛋大小关系以及其他生活史特征。我们观察到最大尺寸与DOC浓度之间存在很强的负相关关系;例如，在低DOC湖泊中，鱼的质量达到150至260 g，但在高DOC湖泊中，鱼的质量<120 g。生殖力和长度之间的关系，和鸡蛋的大小和长度之间，是恒定的DOC梯度。由于高DOC湖泊中的鱼类达到较小的尺寸，但在给定的尺寸下具有相似的繁殖力和卵大小，因此它们的总寿命繁殖力比低DOC湖泊中的鱼类低两个数量级。高DOC浓度似乎限制了蓝鳃金龟生活史策略的范围;高DOC湖泊中的种群总是具有较低的初始增长率和较高的成熟年龄，而低DOC湖泊中的种群在这些性状上表现出较高的变异性。这也是这些人口的自然增长的内在率的情况下，这总是在DOC梯度的高端低。高DOC湖泊鱼类种群从开发中恢复的能力可能较低，这对面临相当大的空间异质性和湖泊DOC浓度持续时间变化的休闲渔业的可持续管理具有明显的影响。
Resource availability constrains the life history strategies available to organisms and may thereby limit population growth rates and productivity. We used this conceptual framework to explore the mechanisms driving recently reported negative relationships between fish productivity and dissolved organic carbon (DOC) concentrations in lakes. We studied populations of bluegill (Lepomis macrochirus) in a set of lakes with DOC concentrations ranging from 3 to 24 mg/L; previous work has demonstrated that primary and secondary productivity of food webs is negatively related to DOC concentration across this gradient. For each population, we quantified individual growth rate, age at maturity, age‐specific fecundity, maximum age, length‐weight and length‐egg size relationships, and other life history characteristics. We observed a strong negative relationship between maximum size and DOC concentration; for instance, fish reached masses of 150 to 260 g in low‐DOC lakes but <120 g in high‐DOC lakes. Relationships between fecundity and length, and between egg size and length, were constant across the DOC gradient. Because fish in high‐DOC lakes reached smaller sizes but had similar fecundity and egg size at a given size, their total lifetime fecundity was as much as two orders of magnitude lower than fish in low‐DOC lakes. High DOC concentrations appeared to constrain the range of bluegill life history strategies available; populations in high‐DOC lakes always had low initial growth rates and high ages at maturity, whereas populations in low‐DOC showed higher variability in these traits. This was also the case for the intrinsic rates of natural increase of these populations, which were always low at the high end of the DOC gradient. The potentially lower capacity for fish populations in high‐DOC lakes to recover from exploitation has clear implications for the sustainable management of recreational fisheries in the face of considerable spatial heterogeneity and ongoing temporal change in lake DOC concentrations.
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