Clutch size and larval performance of pollen beetles on different host plants
Clutch size and larval performance of pollen beetles on different host plants
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DOI：
10.2307/3546546
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发表时间：
1998-10-01
期刊：
影响因子：
3.4
通讯作者：
Ekbom, B
中科院分区：
文献类型：
--
作者：
Ekbom, B
对食草性昆虫的偏好和表现之间的差异经常被用各种解释来解释。在这项研究中，窝卵数和幼虫性能之间的关系被认为是在偏好的背景下。采用序贯选择试验研究了花粉甲虫对5种不同植物的偏好性排序。在相同植物物种上的单独实验中测量作为一周后的幼虫重量估计的性能。M. aeneus对甘蓝型油菜、B. juncea和B.黑芥（Sinapis alba）和芸芥（Eruca sativa）相比。B上的总体幼虫性能。napus最高，E. sativa，B. nigra，B. juncea和S. alba（按降序排列）。因此，偏好和性能之间的差异被证明。这些差异中的一些可以解释时，离合器的大小和幼虫的竞争被认为是。每芽窝卵数在不同植物种间存在差异，E.唾液浓度在B组最低。黑鬼在B上表现出幼虫在芽中的竞争。nigra，B. juncea和S.阿尔巴。在这些物种的幼虫从芽含有四个或更多的幼虫重量小于幼虫从芽与一个单一的幼虫。从多个离合器的幼虫遭受的重量减少与每个植物物种的每个芽的幼虫的预期数量。幼虫对植物物种接收小窝卵数和维持高幼虫死亡率遭受最多的竞争。在具有较大窝卵数和幼虫死亡率小的植物物种上，幼虫之间没有竞争。窝卵数与不同植物种的平均芽大小相关。花粉甲虫根据幼虫对不同寄主植物的竞争期望来调整窝卵数。
Discrepancies found between preference and performance for herbivorous insects are often explained using a variety of interpretations. In this study the relationship between clutch size and larval performance is considered in the context of preference. Sequential choice trials were used to determine the preference ranking of the pollen beetle (Meligethes aeneus) for five different plant species. Performance estimated as larval weights after one week was measured in a separate experiment on the same plant species. M. aeneus showed a strong preference for three Brassica species (Brassica napus, B. juncea and B. nigra) when compared to Sinapis alba and Eruca sativa. Overall larval performance on B. napus was highest followed by E. sativa, B. nigra, B. juncea and S. alba (in descending order). Thus discrepancies between preference and performance were demonstrated. Some of these differences could be explained when clutch size and larval competition were considered. Clutch size per bud differed among plant species, from the highest on E. saliva to the lowest on B. nigra. Competition among larvae in a bud was demonstrated on B. nigra, B. juncea and S. alba. On these species larvae from buds containing four or more larvae weighed less than larvae from buds with a single larva. Reduction in weight suffered by larvae from multiple clutches was correlated to the expected number of larvae per bud for each plant species. Larvae on plant species receiving small clutch sizes and sustaining high larval mortality suffered most from competition. On plant species with larger clutch sizes and little larval mortality no competition among larvae was demonstrated. Clutch size was correlated to mean bud size on the different plant species. It is suggested that the pollen beetle modifies clutch size according to expectation of larval competition on different host plant species.