Propagule pressure and native community connectivity interact to influence invasion success in metacommunities
Propagule pressure and native community connectivity interact to influence invasion success in metacommunities
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繁殖压力和本地群落连通性相互作用，影响元群落中的入侵成功
DOI：
10.1111/oik.06354
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发表时间：
2019
期刊：
影响因子：
3.4
通讯作者：
Howeth, Jennifer G.
中科院分区：
文献类型：
--
作者：
King, Gabrielle E.;Howeth, Jennifer G.
入侵生物学的机械论观点表明，外来物种的繁殖压力和本地群落结构可以独立地影响建立成功。然而，原生群落通过物种扩散的连通性及其与繁殖压力的潜在相互作用在元群落的入侵成功中的作用仍不清楚。原生群落的连通性可能通过提高物种丰富度和均匀度来提高生物对入侵的抵抗力，但其效果可能取决于繁殖压力的水平。在这项研究中，我们使用中胚层实验来评估外来繁殖压力和本地群落连通性对入侵成功的独立和联合影响。通过物种扩散连接的本地浮游动物群落与非本地物种连接的本地浮游动物群落，以及与没有本地物种的对照，评估了三种水平的外来大型水蚤繁殖压力对群落建立成功率、群落结构和生态系统属性的影响。外来物种的建立表现出繁殖剂量依赖关系，高水平的繁殖压力导致最大的建立成功。然而，当地群落的连通性有效地减少了在低繁殖压力水平下的建立，并通过繁殖压力处理进一步增加了当地物种的丰富度。繁殖压力在很大程度上决定了外来物种对本地物种丰富度、本地生物量和可食用生产者生物量的负面影响。结果表明，在低繁殖剂量下，本地群落的连通性可以降低入侵成功率，降低本地竞争对手的灭绝风险，但高的繁殖压力可以克服连通性介导的生物抗性，从而影响外来物种的建立和影响。总之，这些结果强调了繁殖压力和群落连通性作为入侵成功调节器的相互作用的重要性，并主张维持元群落连通性来增强入侵抗性。
Mechanistic insights from invasion biology indicate that propagule pressure of exotic species and native community structure can independently influence establishment success. The role of native community connectivity via species dispersal and its potential interaction with propagule pressure on invasion success in metacommunities, however, remains unknown. Native community connectivity may increase biotic resistance to invasion by enhancing species richness and evenness, but the effects could depend upon the level of propagule pressure. In this study, a mesocosm experiment was used to evaluate the independent and combined effects of exotic propagule pressure and native community connectivity on invasion success. The effects of three levels of exoticDaphnia lumholtzipropagule pressure on establishment success, community structure and ecosystem attributes were evaluated in native zooplankton communities connected by species dispersal versus unconnected communities, and relative to a control without native species. Establishment of the exotic species exhibited a propagule dose‐dependent relationship with high levels of propagule pressure resulting in the greatest establishment success. Native community connectivity, however, effectively reduced establishment at the low level of propagule pressure and further augmented native species richness across propagule pressure treatments. Propagule pressure largely determined the negative impacts of the exotic species on native species richness, native biomass and edible producer biomass. The results highlight that native community connectivity can reduce invasion success at a low propagule dose and decrease extinction risk of native competitors, but high propagule pressure can overcome connectivity‐mediated biotic resistance to influence establishment and impact of the exotic species. Together, the results emphasize the importance of the interaction of propagule pressure and community connectivity as a regulator of invasion success, and argue for the maintenance of metacommunity connectivity to confer invasion resistance.
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影响因子：
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作者：
Puth, LM;Post, DM
通讯作者：
Post, DM
DOI：
10.1098/rspb.2012.0496
发表时间：
2012-08
期刊：
Proceedings of the Royal Society B: Biological Sciences
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2012
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