Contribution of fungal biomass to the growth of the shredder, Pycnopsyche gentilis (Trichoptera: Limnephilidae)
Contribution of fungal biomass to the growth of the shredder, Pycnopsyche gentilis (Trichoptera: Limnephilidae)
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真菌生物量对粉碎机 Pycnopsyche gentilis 生长的贡献（毛翅目：Limnephilidae）
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
K. Suberkropp
中科院分区：
文献类型：
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作者：
N. Chung;K. Suberkropp
总结
1. 1. 它已被接受，水生丝孢菌殖民沉水叶叶增加叶碎屑的营养价值，并建议真菌生物量在碎纸机的生长比叶组织本身发挥更大的作用。然而，目前还不清楚粉碎机的营养需求中有多大比例是由真菌生物质满足的。
2.以水生丝孢菌Anguillospora filiformis（丝状鳗孢菌）定殖的鹅掌楸叶盘为材料，对不同发育阶段的叶蝉幼虫进行了碳源示踪，并对真菌碳源对叶蝉幼虫生长的影响进行了定量分析。 还估计了这种饮食的幼虫的瞬时生长率。
3.当提供真菌定殖的叶子（14-16%真菌生物量）时，三龄和五龄的棉叶甲幼虫的生长速率分别为0.061和0.034天-1，但在无菌叶子的饮食中，两个幼虫龄的体重都减轻了。 真菌碳的掺入率为31.6 μg C mg−1 AFDM day−1，占3龄幼虫日生长率的100%;真菌碳的掺入率为8.6 μg C mg−1 AFDM day−1，占5龄幼虫日生长率的50%。
4.这些结果表明，被A. 丝状真菌是棉大蚊幼虫的优质食物资源，真菌生物量对棉大蚊幼虫的生长有重要贡献。摄食行为和消化生理的差异可以解释真菌生物量的同化作用显着更大的早期比最后一个年龄。为了满足其营养需求的五龄幼虫将不得不同化碎屑质量，可能已被修改的真菌胞外酶。
Summary
1. 1. It has been accepted that aquatic hyphomycetes colonising submerged leaves increase the nutritional value of leaf detritus and suggested that fungal biomass plays a greater role in the growth of shredders than leaf tissue itself. However, it is not clear what proportion of the nutritional needs of shredders is met by fungal biomass.
2. We fed Pycnopsyche gentilis larvae with tulip poplar (Liriodendron tulipifera) leaf discs colonised by the aquatic hyphomycete, Anguillospora filiformis, which had been radiolabelled to quantify the contribution of fungal carbon to the growth of the shredder at different larval developmental stages. Instantaneous growth rates of larvae on this diet were also estimated.
3. When provided with fungal-colonised leaves (14–16% fungal biomass), the third and the fifth instar larvae of P. gentilis grew at the rates of 0.061 and 0.034 day−1, respectively, but on a diet of sterile leaves, both larval instars lost weight. The incorporation rates of fungal carbon were 31.6 μg C mg−1 AFDM day−1, accounting for 100% of the daily growth rate of the third instar larvae and 8.6 μg C mg−1 AFDM day−1, accounting for 50% of the daily growth rate of the fifth instar larvae.
4. These results suggest that leaf material colonised by A. filiformis is a high quality food resource for P. gentilis larvae, and that fungal biomass can contribute significantly to the growth of these larvae. Differences in feeding behaviour and digestive physiology may explain the significantly greater assimilation of fungal biomass by the earlier instar than the final instar. To satisfy their nutritional needs the fifth instar larvae would have to assimilate detrital mass that may have been modified by fungal exoenzymes.