Host specialization in phytophagous insects
WebMay 27, 2024 · Host specialization has long been hypothesized to explain the extraordinary diversity of phytophagous insects in the tropics. However, addressing this hypothesis has proved challenging because of the risk of over-looking rare interactions, and hence biasing specialization estimations, and the difficulties to separate the diversity component … WebWe investigated site-specific host records for more than 7,500 species of insect herbivores. Although host specialists predominate, the proportion of specialists is affected by the …
Host specialization in phytophagous insects
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WebJun 30, 2024 · Ecological specialization and generalism in insects reflect the existence of an evolutionary bidirectional continuum, involving complex, multidimensional scenarios. It has often been assumed that ecological generalism in phytophagous insects comes at the expense of the less intense exploitation of specific resources, and that this trade-off ... WebPHYTOPHAGOUS INSECTS 245 fitness, assumed to be independent of the number of insects using a particular host species, is governed by another. If a newly encountered host plant (e.g. a resistant crop variety or an introduced weed) is accepted for oviposition but is less suitable for development than are ancestral hosts, then an insect popula-
WebApr 8, 2013 · Host specialization is a ubiquitous character of phytophagous insects. The polyphagous population is usually composed of some subpopulations that can use only a … WebApr 8, 2013 · Host specialization is a ubiquitous character of phytophagous insects. The polyphagous population is usually composed of some subpopulations that can use only a few closely related plants. Cotton-melon aphids, Aphis gossypii Glover exhibited strong host specialization, and the cotton- and cucurbits-specialized biotypes had been clearly …
WebThe evolution of host specialization in phytophagous insects is generally thought to involve genetic trade-offs that prevent individuals from maximizing fitness simultaneously on two or more hosts. Several hypotheses, however, have suggested that trade-offs may not be evident in experiments comparing larval performance on normal and novel hosts. WebJun 14, 2024 · Introduction. Host-selection in phytophagous insects is a complex process mediated by many factors including oviposition stimulants [1, 2], feeding stimulants (phagostimulants) [], vision [], experience [], and deterrents [].The preference-performance hypothesis explains the phenomenon of host specificity by positing that adult insects …
WebSep 20, 2016 · Phytophagous insects differ in their degree of specialisation on host plants, and range from strictly monophagous species that can develop on only one host plant to extremely polyphagous species that can develop on hundreds of …
WebDec 11, 2009 · Host specialization to form biotypes is common among phytophagous insects, and it has been hypothesised that biotypes of Dactylopius tomentosus L. (Hemiptera: Dactylopiidae) occur. D. tomentosus is an important biological control agent for Cylindropuntia cacti when they occur as weeds. Additionally, there is uncertainty … ed buck actorWebMar 13, 2013 · Parasitoids of herbivorous insects have frequently evolved specialized lineages exploiting hosts occurring on different plants. This study investigated whether … ed buckbee huntsvilleWebPhytophagous insects possess the key criteria of cybernetic regulators, that is, small biomass, rapid amplification of effect at the ecosystem level, sensitivity to airborne or … ed buck blackWebOct 21, 2024 · Download a PDF of the paper titled Testing host-plant driven speciation in phytophagous insects : a phylogenetic perspective, by Emmanuelle Jousselin and 1 other … ed buck and democratsWebNov 1, 1990 · Host Specialization In Phytophagous Insects November 1990 Annual Review of Ecology and Systematics 21 (1):243-273 Authors: John … conditioned stimulus definition ap psychWebMar 7, 2011 · The many previous comparisons of closely related phytophagous insect species and their host affiliation provide insight into the evolutionary history of host plant specialization/host shift and its impact on speciation (25, 39–41); in addition, some examples have compared different host affiliations within a species (42, 43). However, … conditioned stimulus conditioned responseWebFeb 21, 2008 · Most phytophagous insects tend to be host plant specialists, feeding and carrying out virtually all key life-history activities (e.g., mate-acquisition and reproduction) on one or a relatively small subset of closely related plant species (Futuyma 1991; Bernays and Chapman 1994; Thompson 1994; Novotny and Basset 2005). ed buck cnn