Seabird diversity and biomass enhance cross-ecosystem nutrient subsidies.
Seabird diversity and biomass enhance cross-ecosystem nutrient subsidies.
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海鸟多样性和生物质增强了跨生态系统的营养补贴。
DOI：
10.1098/rspb.2022.0195
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发表时间：
2022-05-11
期刊：
影响因子：
--
通讯作者：
Graham NAJ
中科院分区：
文献类型：
--
作者：
Benkwitt CE;Carr P;Wilson SK;Graham NAJ
移动消费者是跨生态系统营养的关键载体，但经历了人口下降，威胁到他们履行这一角色的能力。尽管消费者生物多样性很重要，也很脆弱，但除了生物量外，关于消费者生物多样性如何影响营养补贴的规模的信息很少。在这里，我们表明，海鸟的生物量和多样性都加强了热带岛屿和珊瑚礁的营养供应，但它们的相对影响在不同的系统中有所不同。海鸟的生物量对于陆地和近岸的补贴和提高鱼类生物量特别重要，而海鸟的多样性与更远的近海的营养补贴有关。多样性的积极影响可能是由于海鸟物种之间在与养分储存和供应有关的特征上具有高度的功能互补性。然而，引入老鼠和非原生植被降低了海鸟的生物量和多样性，其中老鼠对生物量的影响较大，植被对多样性的影响较大。因此，当消除这两个应激源时，恢复海鸟提供的跨生态系统营养流可能是最成功的，从而保护高生物量和多样性。认识到移动消费者多样性和生物量及其潜在驱动因素的重要性，是保护这些物种及其提供的生态系统功能的必要步骤。
Mobile consumers are key vectors of cross-ecosystem nutrients, yet have experienced population declines which threaten their ability to fill this role. Despite their importance and vulnerability, there is little information on how consumer biodiversity, in addition to biomass, influences the magnitude of nutrient subsidies. Here, we show that both biomass and diversity of seabirds enhanced the provisioning of nutrients across tropical islands and coral reefs, but their relative influence varied across systems. Seabird biomass was particularly important for terrestrial and near-shore subsidies and enhancing fish biomass, while seabird diversity was associated with nutrient subsidies further offshore. The positive effects of diversity were likely driven by high functional complementarity among seabird species in traits related to nutrient storage and provisioning. However, introduced rats and non-native vegetation reduced seabird biomass and diversity, with rats having a stronger effect on biomass and vegetation having a stronger effect on diversity. Accordingly, the restoration of cross-ecosystem nutrient flows provided by seabirds will likely be most successful when both stressors are removed, thus protecting both high biomass and diversity. Recognizing the importance of mobile consumer diversity and biomass, and their underlying drivers, is a necessary step to conserving these species and the ecosystem functions they provide.
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影响因子：
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作者：
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DOI：
10.1073/pnas.1704949114
发表时间：
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影响因子：
11.1
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通讯作者：
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DOI：
10.1073/pnas.1502549112
发表时间：
2016-01-26
影响因子：
11.1
作者：
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