Macroalgae size refuge from herbivory promotes alternative stable states on coral reefs.
Macroalgae size refuge from herbivory promotes alternative stable states on coral reefs.
复制标题
DOI：
10.1371/journal.pone.0202273
复制
发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Schmitt RJ
中科院分区：
文献类型：
--
作者：
Briggs CJ;Adam TC;Holbrook SJ;Schmitt RJ
珊瑚礁系统可以经历从珊瑚占主导地位的大型藻类占主导地位的状态下的干扰，模型表明，这些可能有时代表替代稳定状态之间的转变。虽然有几种机制可能会导致珊瑚礁的交替稳定状态，但只有少数几种在理论上进行了研究。我们探索了一个模型，说明了减少大型藻类的脆弱性，草食动物作为大型藻类的生长和成熟可能是一个重要的机制：当大型藻类是适口的草食动物作为青少年，但耐作为成年人，珊瑚为主和藻类为主的国家是在很大范围内的参数空间。我们比较了两种方法，全球敏感性分析排名的相对重要性的模型参数，在确定替代稳定状态的存在和大小，并发现，两个最有影响力的参数是珊瑚的死亡率和成熟的脆弱阶段的藻类的速度。随机森林方法的全球敏感性分析，最近采用的生态学家，提供了一个更有效的方法来排序参数的相对重要性比方差为基础的方法，已被计算机科学家和工程师经常使用。我们的研究结果表明，管理珊瑚礁以减少导致珊瑚死亡和/或提高藻类生长速度的慢性压力源可以帮助防止珊瑚礁被锁定在大型藻类占主导地位的状态。
Coral reef systems can undergo rapid transitions from coral-dominated to macroalgae-dominated states following disturbances, and models indicate that these may sometimes represent shifts between alternative stable states. While several mechanisms may lead to alternate stable states on coral reefs, only a few have been investigated theoretically. We explore a model that illustrates that reduced vulnerability of macroalgae to herbivory as macroalgae grow and mature could be an important mechanism: when macroalgae are palatable to herbivores as juveniles, but resistant as adults, coral-dominated and algae-dominated states are bistable across a wide range of parameter space. We compare two approaches to global sensitivity analysis to rank the relative importance of the model parameters in determining the presence and magnitude of alternative stable states, and find that the two most influential parameters are the death rate of coral and the rate of maturation of algae out of the vulnerable stage. The Random Forest approach for global sensitivity analysis, recently adopted by ecologists, provides a more efficient method for ranking the relative importance of parameters than a variance-based approach that has been used frequently by computer scientists and engineers. Our results suggest that managing reefs to reduce chronic stressors that cause coral mortality and/or enhance the growth rates of algae can help prevent reefs from becoming locked in a macroalgae-dominated state.
登录
查看更多内容
DOI：
10.1073/pnas.071524598
发表时间：
2001-04-24
影响因子：
11.1
作者：
Edmunds, PJ;Carpenter, RC
通讯作者：
Carpenter, RC
影响因子：
5
作者：
Harper, Elizabeth B.;Stella, John C.;Fremier, Alexander K.
通讯作者：
Fremier, Alexander K.
影响因子：
3.4
作者：
Mumby, Peter J.;Steneck, Robert S.;Hastings, Alan
通讯作者：
Hastings, Alan
影响因子：
2.9
作者：
Chase, JM
通讯作者：
Chase, JM
影响因子：
4.8
作者：
Bruno, John F.;Sweatman, Hugh;Schutte, Virginia G. W.
通讯作者：
Schutte, Virginia G. W.