4.7 Article

Dead litter of resident species first facilitates and then inhibits sequential life stages of range-expanding species

期刊

JOURNAL OF ECOLOGY
卷 109, 期 4, 页码 1649-1664

出版社

WILEY
DOI: 10.1111/1365-2745.13586

关键词

biotic resistance; herbivory; invasive species; legacy effects; litter; mangroves; ontogenetic shifts; range expansion

资金

  1. National Science Foundation
  2. [LSSC-17-00095]
  3. [SAL-17-1958-SR]

向作者/读者索取更多资源

Resident species can either facilitate or inhibit invading species, depending on the context of species interactions and abiotic conditions. In the case of Spartina alterniflora and Avicennia germinans in northeast Florida salt marshes, wrack from the native marsh cordgrass influenced the establishment and survival of the black mangrove. The study showed that while the wrack initially facilitated the establishment of A. germinans, it later inhibited seedling survival due to smothering and attracting herbivores. Interactions between resident and invading species can vary in strength and direction with ontogeny, highlighting the importance of studying these interactions across different life stages and environmental gradients.
Resident species can facilitate invading species (biotic assistance) or inhibit their expansion (biotic resistance). Species interactions are often context-dependent and the relative importance of biotic assistance versus resistance could vary with abiotic conditions or the life stage of the invading species, as invader stress tolerances and resource requirements change with ontogeny. In northeast Florida salt marshes, the abundant dead litter (wrack) of the native marsh cordgrass, Spartina alterniflora, could influence the expansion success of the black mangrove, Avicennia germinans, a tropical species that is expanding its range northward. We used two field experiments to examine how S. alterniflora wrack affects A. germinans success during (a) propagule establishment and (b) subsequent seedling survival. We also conducted laboratory feeding assays to identify propagule consumers and assess how wrack presence influences herbivory on mangrove propagules. Spartina alterniflora wrack facilitated A. germinans establishment by promoting propagule recruitment, retention and rooting; the tidal regime influenced the magnitude of these effects. However, over time S. alterniflora wrack inhibited A. germinans seedling success by smothering seedlings and attracting herbivore consumers. Feeding assays identified rodents-which seek refuge in wrack-as consumers of A. germinans propagules. Synthesis. Our results suggest that the deleterious effects of S. alterniflora wrack on A. germinans seedling survival counterbalance the initial beneficial effects of wrack on A. germinans seed establishment. Such seed-seedling conflicts can arise when species stress tolerances and resource requirements change throughout development and vary with abiotic conditions. In concert with the tidal conditions, the relative importance of positive and negative interactions with wrack at each life stage can influence the rate of local and regional mangrove expansion. Because interaction strengths can change in direction and magnitude with ontogeny, it is essential to examine resident-invader interactions at multiple life stages and across environmental gradients to uncover the mechanisms of biotic assistance and resistance during invasion.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据