Effects of litter size and quality on processing by decomposers in a tropical savannah stream
Effects of litter size and quality on processing by decomposers in a tropical savannah stream
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DOI：
10.1111/btp.12547
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发表时间：
2018-07
期刊：
影响因子：
2.1
通讯作者：
Renan Souza Rezende;Gustavo F. M. Leite;Kamilla Ramos;Isabella Torres;A. Tonin;J. F. Gonçalves Júnior
中科院分区：
文献类型：
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作者：
Renan Souza Rezende;Gustavo F. M. Leite;Kamilla Ramos;Isabella Torres;A. Tonin;J. F. Gonçalves Júnior
由于分解者的不同利用，凋落物碎片的大小和质量对生态系统功能和全球生态地球化学循环有着深远的影响。在这里，我们研究这些因素对分解者的影响，从两个公会发现在热带萨凡纳流：无脊椎动物切碎机属Phylloicus和微生物。容器（16 × 16 × 12 cm，~ 3 L）的含Phylloicus（去除病例; N = 16）或含微生物的溪水（N = 16）的容器中提供来自Inga laurina、Maprounea guianensis和Richeria grandis的凋落物，并切成直径为18.7、13.2和8.1 mm的圆盘（3种尺寸× 3种=每个容器9个圆盘）。在仅微生物培养物中，较小的叶盘和较高质量的叶盘的相对分解更大。Phylloicus优先收获大的碎片用于案例构建，也喜欢M. guianensis和R. grandis，可能是由于案件形成的鲁棒性增加。微生物分解导致约20%的凋落物质量损失，而Phylloicus中为30%（其中8%用于案例建筑，24%用于食物）。因此，变化输入凋落物的大小，如减少干旱后的叶片大小，可能会改变微生物的分解，并可能影响碎纸机人口限制的外壳材料的可用性。
Litter fragment size and quality can have profound effects on ecosystem functioning and global biogeochemical cycling due to differential utilization by decomposers. Here we study the influence of these factors on decomposers from two guilds found in a tropical savannah stream: invertebrate shredders of the genus Phylloicus and microorganisms. Containers (16 × 16 × 12 cm, ~ 3L) with either Phylloicus (cases removed; N = 16) or stream water containing microorganisms (N = 16) were supplied with litter from the species Inga laurina, Maprounea guianensis, and Richeria grandis, and cut into disks of 18.7, 13.2, and 8.1 mm in diameter (3 sizes × 3 species = 9 disks per container). Relative decomposition was greater for smaller leaf disks and disks of higher quality in microbial‐only cultures. Phylloicus preferentially harvested large fragments for case building, also preferring the leaves of M. guianensis and R. grandis, likely due increased robustness for case formation. Microbial decomposition resulted in ~20% litter mass loss compared to 30% in Phylloicus (of which 8% was used for case building and 24% for food). Thus, changes to input litter size, such as a decrease in leaf size after drought, may alter microbial decomposition and potentially affect shredder populations by limiting the availability of casing material.