The “sequential cues hypothesis”: a conceptual model to explain host location and ranking by polyphagous herbivores  

作　　者：Rehan Silva Anthony R.Clarke 

机构地区：[1]School of Earth.Environmental and Biological Sciences,Queensland University of Technology(QUT),Brisbane,Queensland,Australia

出　　处：《Insect Science》2020年第6期1136-1147,共12页昆虫科学（英文版）

基　　金：The authors acknowledge research support through the Centre for Fruit Fly Biosecurity Innovation,funded through the Australian Research CounciFs Industrial Transformation Training Centre Program(ARC ITTC).

摘　　要：Successfully locating a host plant is crucial for an insect herbivore to feed and/or oviposit.However,locating a host within a complex environment that may contain an array of different plant species is a difficult task.This is particularly the case for polyphagous herbivores,which must locate a host within environments that may simultaneously contain multiple suitable and unsuitable hosts.Here we review the mechanisms of host selection used by polyphagous herbivores,as well as exploring how prior experience may modify a generalist's response to host cues.We show that recent research demonstrates that polyphagous herbivores have the capacity to detect both common cues from multiple host species,as well as specific cues from individual host species.This creates a paradox in that generalists invariably rank hosts when given a choice,a finding at odds with the“neural limitations”hypothesis that says generalist insect herbivores should not have the neural capacity to identify cues specific to every possible host.To explain this paradox we propose a model,akin to parasitoid host location,that postulates that generalist herbivores use different cues sequentially in host location.We propose that initially common host cues,associated with all potential hosts,are used to place the herbivore within the host habitat and that,in the absence of any other host cues,these cues are sufficient in themselves to lead to host location.As such they are true “generalist”cues.However,once within the host habitat,we propose that the presence of a smaller group of cues may lead to further host searching and the location of preferred hosts:these are“specialist”cues.This model explains the current conflict in the literature where generalists can respond to both common and specific host-plant cues,while also exhibiting specialist and generalist host use behavior under different conditions.

关 键 词：diet breadth FORAGING insect behavior insect-plant relationship learning neural constraints visual cues volatile cues 

分 类 号：Q96[生物学—昆虫学]