Aquatic insects balance growth with future supply of algal food resources
Aquatic insects balance growth with future supply of algal food resources
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DOI：
10.1111/oik.09902
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发表时间：
2023-10-10
期刊：
影响因子：
3.4
通讯作者：
Ives，Anthony R.
中科院分区：
文献类型：
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作者：
Botsch，Jamieson C.;Book，K. Riley;Ives，Anthony R.
许多消费者依赖于他们的食物资源的同期增长。例如，Tanytarsus gracilentusmidges以藻类为食，由于摇蚊的世代时间比藻类长得多，因此个体摇蚊不仅受益于现存种群，而且受益于藻类在其生命周期中的生长。这意味着，一个中间的消费率最大限度地提高了蠓的体细胞生长：低消费率限制蠓的增长，因为他们没有充分利用现有的食物，而高消费率抑制藻类生物量的增长，从而限制未来的食物供应。一项操纵蠓存在和初始藻类丰度的实验表明，蠓可以抑制藻类生长，这是通过藻类总初级生产力（GPP）的变化来衡量的。我们还发现了GPP和吸浆虫生长之间的正相关关系。与实验数据拟合的消费者-资源模型显示了蠓消费率与其体细胞生长之间的驼峰形关系。在该模型中，预测的蠓体细胞生长速率与GPP呈正相关时，他们的消费率低于优化的值，蠓的增长。因此，在实验中，蠓并没有过度利用藻类。这项工作强调了依赖同期资源增长的消费者可能必须在短期增长和未来粮食供应之间取得平衡，以及当消费者“管理”好他们的资源时对他们的好处。
Many consumers depend on the contemporaneous growth of their food resources. For example,Tanytarsus gracilentusmidges feed on algae, and because midge generation time is much longer than that of algae, individual midges benefit not just from the standing stock but also from the growth of algae during their lifespans. This implies that an intermediate consumption rate maximizes midge somatic growth: low consumption rates constrain midge growth because they do not fully utilize the available food, whereas high consumption rates suppress algal biomass growth and consequently limit future food availability. An experiment manipulating midge presence and initial algal abundance showed that midges can suppress algal growth, as measured by changes in algal gross primary production (GPP). We also found a positive relationship between GPP and midge growth. A consumer–resource model fit to the experimental data showed a hump‐shaped relationship between midge consumption rates and their somatic growth. In the model, predicted midge somatic growth rates were only positively associated with GPP when their consumption rate was below the value that optimized midge growth. Therefore, midges did not overexploit algae in the experiment. This work highlights the balance that consumers which depend on contemporaneous resource growth might have to strike between short‐term growth and future food availability, and the benefits for consumers when they ‘manage' their resources well.