Concurrent effects of resource pulse amount, type, and frequency on community and population properties of consumers in detritus-based systems.
Concurrent effects of resource pulse amount, type, and frequency on community and population properties of consumers in detritus-based systems.
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DOI：
10.1007/s00442-011-2209-4
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发表时间：
2012-06
期刊：
影响因子：
2.7
通讯作者：
Juliano, Steven A.
中科院分区：
文献类型：
--
作者：
Yee, Donald A.;Juliano, Steven A.
间歇性资源投入（即豆类）可以影响食物网特性和群落动态，但对这种影响的详细机制理解仍然难以捉摸。天然水生微系统（例如树洞、人造容器）被无脊椎动物定殖，形成复杂的食物网，依赖于来自邻近陆地环境的间歇性、有时是大量的外来碎屑输入。我们研究了脉冲频率、数量和资源类型的变化如何相互作用，从而影响森林栖息地中充满水的轮胎和树洞类似物中定植的无脊椎动物的丰富度、丰度、组成和种群规模。使用不同的容器类型来评估两种环境背景下影响的普遍性。容器接收同一时期分布的不同累积量的大量不频繁或少量频繁的动物或树叶碎屑脉冲。在六月和九月，当两个脉冲频率的累积碎屑输入相等时，对无脊椎动物进行了采样。脉冲频率和碎屑类型相互作用，影响这两个月的丰富度和丰度的响应；仅六月份的脉冲频率就影响了丰富度和丰度之间的关系。无论碎屑类型如何，碎屑越多，丰富度和丰度也越高。滤食性动物这一群体在推动豆类丰度和丰富度的响应方面发挥着最重要的作用，尤其是在六月。这项工作强调了社区和人群对资源脉冲的反应的潜在复杂性，并暗示某些群体利用碎屑资源脉冲的能力是理解社区一级对脉冲的反应的关键。
Episodic resource inputs (i.e., pulses) can affect food web properties and community dynamics, but detailed mechanistic understanding of such effects remain elusive. Natural aquatic microsystems (e.g., tree holes, human-made containers) are colonized by invertebrates that form complex food webs dependent on episodic and sometimes sizeable inputs of allochthonous detritus from adjacent terrestrial environments. We investigated how variation in pulse frequency, amount, and resource type interacted to affect richness, abundance, composition, and population sizes of colonizing invertebrates in water-filled tires and tree hole analogs in a forest habitat. Different container types were used to assess the generality of effects across two environmental contexts. Containers received large infrequent or small frequent pulses of animal or leaf detritus of different cumulative amounts distributed over the same period. Invertebrates were sampled in June and September when cumulative detritus input was equal for the two pulse frequencies. Pulse frequency and detritus type interacted to affect the responses of richness and abundance in both months; pulse frequency alone in June affected the relationship between richness and abundance. Richness and abundance were also greater with more detritus regardless of detritus type. One group, the filter feeders, were most important in driving the response of abundance and richness to pulses, especially in June. This work highlights the potential complex nature of responses of communities and populations to resource pulses and implicates the ability of certain groups to exploit pulses of detrital resources as a key to understanding community-level responses to pulses.
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影响因子：
4.8
作者：
ABRAMS, PA
通讯作者：
ABRAMS, PA
影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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Carde, Ring T.
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作者：
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