Influence of patch size and resource quantity on litter invertebrate assemblages in dry treeholes
Influence of patch size and resource quantity on litter invertebrate assemblages in dry treeholes
复制标题
斑块大小和资源数量对干树洞凋落物无脊椎动物群落的影响
DOI：
10.1080/13416979.2017.1337261
复制
发表时间：
2017
影响因子：
1.5
通讯作者：
Ayabe Y.
中科院分区：
文献类型：
--
作者：
Yoshida T.;Miyamatsu T.;Ayabe Y.
树洞是森林生态系统地上部分的干燥或充满水的洞穴，支持陆生和水生无脊椎动物。与充满水的树洞中的水生无脊椎动物群落相比，很少有人知道斑块大小或资源量对干燥树洞中陆生无脊椎动物群落的影响有多大。因此，我们研究的因素，影响陆地无脊椎动物组合在干树洞使用人工树洞和调查天然树洞，无论是在日本中部的阔叶林的实地实验。在人工树洞中，最终凋落物密度（每单位树洞体积的最终凋落物重量），这表明了资源集中的程度，与总无脊椎动物丰度呈正相关，并在实验结束时剩余的凋落物的比例呈负相关。这些结果表明，更大的凋落物密度的结果在无脊椎动物的丰度和凋落物分解的增加。然而，在天然树洞中，陆生无脊椎动物的总丰度与凋落物密度，凋落物重量，或树洞体积并不显着相关。凋落物的数量，其中主要包括细颗粒有机物，增加与树洞开口的大小（面积）和体积，这表明已经分解的凋落物被填充，这取决于树洞体积。这可能是由于在自然条件下陆生无脊椎动物丰度的结果不显著。因此，我们认为，凋落物重量和密度是重要的因素，在确定丰富的无脊椎动物在干树洞，即使他们的影响是削弱在自然树洞的其他因素的影响。
Treeholes are dry or water-filled cavities that occur in the aboveground parts of forest ecosystems and support terrestrial and aquatic invertebrates. Compared with aquatic invertebrate assemblages in water-filled treeholes, little is known about how strongly patch size or resource quantity affects the terrestrial invertebrate assemblages in dry treeholes. Therefore, we examined the factors that affect terrestrial invertebrate assemblages in dry treeholes using a field experiment with artificial treeholes and by investigating natural treeholes, both in broad-leaved forests in central Japan. In the artificial treeholes, final litter density (final litter weight per unit treehole volume), which indicates the extent of resource concentration, was positively correlated with total invertebrate abundance and negatively correlated with the proportion of litter remaining at the end of the experiment. These results suggest that greater litter density results in an increase in both invertebrate abundance and litter decomposition. In natural treeholes, however, the total abundance of terrestrial invertebrates was not significantly correlated with litter density, litter weight, or treehole volume. The quantity of litter, which consisted mainly of fine particulate organic matter, increased with treehole opening size (area) and volume, suggesting that already decomposed litter was filled, depending on the treehole volume. This may have been attributed to the nonsignificant results concerning the abundance of terrestrial invertebrates in natural conditions. Thus, we suggest that both litter weight and density are important factors in determining the abundance of invertebrate in dry treeholes, even though their influence is weakened in natural treeholes by the effects of other factors.