Ontogenetic Variation in Blade Toughness May Contribute to the Spread of Turbinaria ornata Across the South Pacific

Ontogenetic Variation in Blade Toughness May Contribute to the Spread of Turbinaria ornata Across the South Pacific
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叶片韧性的个体发生变化可能有助于Turbinaria ornata在南太平洋的传播

DOI:
10.1111/jpy.13292
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发表时间:
2022
影响因子:
2.9
通讯作者:
Fong, Caitlin R.
Fong, Caitlin R.
中科院分区:
生物学3区
文献类型:
--
作者:
Betancourt, Austin M.;Fenwick, Ileana F.;Howard, Hunter B.;Long, Alexys E.;Fong, Peggy;Barber, Paul H.;Fong, Caitlin R.

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珊瑚礁正在从珊瑚转向全球藻类主导的生态系统。最近,Turbinaria ornata,一种原产于南太平洋珊瑚礁的海洋生物,在范围和栖息地使用方面都有传播。给定T.虽然ornatacan可以作为珊瑚礁的替代稳定状态,但必须了解其成功的基础因素。我们检验了T. ornata演示了个体发育的变化分配到反草食动物防御,特别是叶片韧性与叶状体大小非线性变化。我们量化了T. ornatablade韧性和叶状体的大小为个别菌体内的藻类看台(N= 345)沿着北岸的莫雷阿,法属波利尼西亚的七个边缘礁。我们发现,叶片的韧性是最大的中间尺寸,通常形成檐篷,与整体降低的韧性,在较小的个人,避难所内的林下和老年人的生殖个体,最终分离,形成浮动筏。我们认为,这种叶片韧性的变化减少了对最暴露于食草动物的菌体的食草性,并可能促进分散阶段的繁殖,这两者都可能有助于T的增殖。装饰。
Coral reefs are shifting from coral to algal‐dominated ecosystems worldwide. Recently,Turbinaria ornata, a marine alga native to coral reefs of the South Pacific, has spread in both range and habitat usage. Given dense stands ofT. ornatacan function as an alternative stable state on coral reefs, it is imperative to understand the factors that underlie its success. We tested the hypothesis thatT. ornatademonstrates ontogenetic variation in allocation to anti‐herbivore defense, specifically that blade toughness varied nonlinearly with thallus size. We quantified the relationship betweenT. ornatablade toughness and thallus size for individual thalli within algal stands (N= 345) on seven fringing reefs along the north shore of Moorea, French Polynesia. We found that blade toughness was greatest at intermediate sizes that typically form canopies, with overall reduced toughness in both smaller individuals that refuge within the understory and older reproductive individuals that ultimately detach and form floating rafts. We posit this variation in blade toughness reduces herbivory on the thalli that are most exposed to herbivores and may facilitate reproduction in dispersing stages, both of which may aid the proliferation ofT. ornata.
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