Feeding range studies of Rodolia cardinalis (Mulsant), a candidate biological control agent of Icerya purchasi Maskell in the Galapagos islands
Feeding range studies of Rodolia cardinalis (Mulsant), a candidate biological control agent of Icerya purchasi Maskell in the Galapagos islands
复制标题
DOI：
10.1016/j.biocontrol.2003.07.002
复制
发表时间：
2004-03-01
影响因子：
4.2
通讯作者：
Poulsom, TGA
中科院分区：
文献类型：
--
作者：
Causton, CE;Lincango, MP;Poulsom, TGA
棉垫蚧Icerya purchasi Maskell（同翅目：珠蚧科）对加拉帕戈斯群岛濒危植物群保护的直接威胁促使保护组织评估与引入其天敌Rodolia cardinalis（Mulsant）（鞘翅目：瓢虫科）相关的风险。虽然R.红雀已被广泛用于控制这种外来害虫，很少有资料证实其假定的狭窄的取食范围。因此，认为有必要进行研究，以确定引进红胸蛙是否会损害岛上的本地无脊椎动物，特别是稀有或受威胁的物种。采用无选择试验方法，对该虫的新生幼虫和三龄幼虫进行了测定。红雀对16和11个潜在的猎物物种分别。有进食经验的成年人。purchasi对8个非目标物种和幼稚的成年人（那些没有以I.购买）进行了测试，对六个。这些试验包括多达35%的同翅目物种的保护价值，假定有最高的风险被捕食的R。红雀。为了最大限度地扩大暴露于R的物种范围。还对一些引入的物种进行了饲养试验，这些物种代表了含有未定位用于测试的潜在非目标物种的群体。红腹圆蚧不能在任何一种猎物上完成其生活史，只能取食与棉垫蚧关系密切的相似珠蚧莫里森（同翅目：珠蚧科）。M.然而，similis是地下的，在它的自然栖息地是没有风险的觅食R。红雀。根据这些试验，我们认为，未成熟阶段的R。cardinalis不会对加拉帕戈斯群岛的非目标无脊椎动物群产生影响，因为它们专门研究Margarodidae。虽然我们的测试的有限性使我们无法对R的猎物范围得出明确的结论。cardinalis成虫，我们的结果表明，它也是狭窄的。根据我们的现场和实验室研究，生态位重叠同翅目的本地捕食者将是最小的，不应该发生的行会内捕食。(C)2003年爱思唯尔公司All rights reserved.
The immediate threat of the cottony cushion scale, Icerya purchasi Maskell (Homoptera: Margarodidae), to the conservation of endangered flora in the Galapagos islands prompted conservation groups to assess the risks associated with the introduction of its natural enemy, Rodolia cardinalis (Mulsant) (Coleoptera: Coccinellidae). Although R. cardinalis has been widely used for controlling this exotic pest, little information was found to confirm its presumed narrow feeding range. Consequently, studies were deemed necessary to determine whether the introduction of R cardinalis would harm the island's native invertebrate fauna, in particular rare or threatened species. Using no-choice trials, we tested neonate and third instar larvae of R. cardinalis against 16 and 11 potential prey species, respectively. Adults with prior feeding experience on I. purchasi were tested against eight non-target species and naive adults (those that had not fed on I. purchasi) were tested against six. These trials included up to 35% of the Homoptera species of conservation value presumed to have the highest risk of being preyed upon by R. cardinalis. To maximize the range of species exposed to R. cardinalis, feeding trials were also carried out with some introduced species representative of groups containing potential non-target species that were not located for testing. P, cardinalis was unable to complete its life cycle on any of the test prey species and only fed on Margarodes similis Morrison (Homoptera: Margarodidae), a species closely related to the cottony cushion scale. M. similis, however, is subterranean and in its natural habitat is not at risk from foraging by R. cardinalis. Based on these trials, we believe that immature stages of R. cardinalis will have no impact on the non-target invertebrate fauna of the Galapagos islands because they specialize on Margarodidae. Although the limited nature of our testing prevents us from reaching a definitive conclusion about the prey range of R. cardinalis adults, our results indicate that it is also narrow. According to our field and laboratory studies, niche overlap with native predators of Homoptera will be minimal and intraguild predation should not occur. (C) 2003 Elsevier Inc. All rights reserved.