Ayal Y, Izhaki I
Mitrani Center for Desert Ecology, Jacob Blaustein Institute for Desert Research, Ben Gurion University Sede Boqer, 84 993, Israel.
Oecologia. 1993 Apr;93(4):518-523. doi: 10.1007/BF00328960.
The effect of feeding of the mirid bug Capsodes infuscatus on fruit production of the geophyte Asphodelus ramosus was studied in a desert area in Israel. Plant and bug densities and percent loss of fruit production were measured in a relatively dry lower colluvial slope, an intermediate upper colluvial slope, and a relatively mesic wadi. Overall damage levels were very high, with 100% loss of fruit production in many plants. Within each habitat, the number of nymphs per plant clone was positively correlated with the number of ramets per clone and percent damage was positively correlated with number of nymphs per clone. However, percent damage was not correlated with number of plants per clone in any habitat. Although damage did significantly increase with plant density in the slope habitats, mean damage to fruit production per clone was lowest (50%) in the wadi where Asphodelus density was highest. As new ramets are tightly interwoven with their mother plants, occupation of new microsites depends on establishment of new clones from seeds. Therefore, the strong and density-dependent reduction in fruit production inflicted by Capsodes on the Asphodelus population on the slope has the potential to regulate the plant density in this habitat.
在以色列的一个沙漠地区，研究了盲蝽Capsodes infuscatus取食对旱生植物分枝阿福花果实产量的影响。在相对干燥的下部洪积扇斜坡、中等的上部洪积扇斜坡和相对湿润的干谷中，测量了植物和盲蝽的密度以及果实产量的损失百分比。总体损害程度非常高，许多植物的果实产量损失达100%。在每个生境中，每个植物克隆上若虫的数量与每个克隆的分株数量呈正相关，损害百分比与每个克隆上若虫的数量呈正相关。然而，在任何生境中，损害百分比与每个克隆的植物数量均无相关性。虽然在斜坡生境中，损害确实随植物密度显著增加，但在阿福花密度最高的干谷中，每个克隆果实产量的平均损害最低（50%）。由于新的分株与母株紧密交织在一起，新微生境的占据取决于种子形成新的克隆。因此，盲蝽对斜坡上阿福花种群果实产量造成的强烈且依赖密度的降低，有可能调节该生境中的植物密度。
