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Evidence of surplus carrying capacity for benthic invertebrates with the poleward range extension of the tropical seagrass Halophila decipiens in SE Brazil

机译:底栖无脊椎动物的盈余承载能力剩余持有能力的证据,并在巴西的热带海草嗜睡烟草的膨胀范围延伸

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摘要

Seagrasses may enhance the abundance and diversity of benthic invertebrates through trophic facilitation. We investigated this potential ecological function for two seagrasses in SE Brazil: Halodule emarginata, a native species, and Halophila decipiens, a tropical seagrass recently established in the region. At Halophila sites, the organic matter (or carbon) in sediments decreased steadily from seagrass patches to isolated bare grounds, indicating surplus primary production. This was not observed at Halodule sites. At one of the two Halophila sites, localized trophic enrichment was also consistently linked to increased invertebrate abundance within patches, chiefly through increased carrying capacity of small mesoherbivores. Rather than spillover, edge effects were observed at bordering bare habitats, where polychaete predators were abundant. The transition from seagrass edges to isolated bare habitats was marked by an increase of the density of sipunculid worms. The current spread of Halophila may thus change the spatial distribution of benthic ecological functions.
机译:海草可以通过营养便利化提高底栖无脊椎动物的丰富和多样性。我们调查了Se Brazil中的两个海草的这种潜在生态功能:Halodule emarginata,天然物种和嗜睡酵母,最近在该地区建立的热带海草。在Halophila遗址,沉积物中的有机物质(或碳)从海草贴片稳定地降低到裸露的地面,表明剩余的初级生产。在Halodule位点未观察到这一点。在两种嗜睡症之一,局部营养性富集也一直与贴片内的无脊椎动物丰度增加,主要是通过增加小型中药性的载体能力。在裸境内观察到边缘效应而不是溢出,边缘效应,多档捕食者丰富。从海草边缘到孤立的裸境的过渡标志着Sipulid蠕虫的密度增加。因此,嗜睡的目前的蔓延可能会改变底栖生态功能的空间分布。

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