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.
中科院分区:
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.
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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