Energetic increases lead to niche packing in deep-sea wood falls

Energetic increases lead to niche packing in deep-sea wood falls
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能量的增加导致深海木材瀑布的生态位堆积

DOI:
10.1098/rsbl.2018.0294
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发表时间:
2018
期刊:
影响因子:
3.3
通讯作者:
Barry, James P.
Barry, James P.
中科院分区:
生物学2区
文献类型:
--
作者:
McClain, Craig R.;Nunnally, Clifton;Chapman, Abbie S.;Barry, James P.

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导致能量梯度上多样性变化的机制继续挑战着生态学家。多样性的变化可能反映了生态位填充增加或生态位空间扩大所带来的支持物种共存的环境容量。目前的生态学理论预测,能源的增加可能会导致这两种情况,但不会导致它们的相对优势。我们使用实验性的深海、木材群落,在那里能源供应可以控制,以测试生态位扩展和包装在能量梯度上的功能空间的重要性。对16种无脊椎动物群落进行了鉴定和统计。在太平洋的3203米海底,作业时间长达5年,作业体积从0.6到20.6 kg不等(与能源可用性相对应)。我们使用四种基本的能量物种水平功能特征-食物来源,营养类别,运动和分层-来表征物种生态位。木材能量的增加导致物种丰富度的增加。这种物种丰富度的增加是由于平均生态位重叠的大幅增加,表明能量的增加可能会减少竞争。
Mechanisms leading to variation in diversity over energetic gradients continue to challenge ecologists. Changes in diversity may reflect the environmental capacity to support species' coexistence through increased niche packing or niche space expansion. Current ecological theory predicts that increases in energy may lead to both scenarios but not their relative strengths. We use experimental deep-sea, wood-fall communities, where energy supply can be controlled, to test for the importance of niche expansion and packing in functional space over an energetic gradient. Invertebrate communities were identified and counted from 16Acaciasp. logs ranging in size from 0.6 to 20.6 kg in mass (corresponding to energy availability) deployed at 3203 m in the Pacific Ocean for 5 years. We use four fundamental energetic species-level functional traits—food source, trophic category, motility and tiering—to characterize species niches. Increases in energy on wood falls lead to increases in species richness. This higher species richness resulted from a substantial increase in mean niche overlap, suggesting that increases in energy may afford reduced competition.
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