Contest behaviour of maize weevil larvae when competing within seeds

Guedes, N. M. P.; Guedes, R. N. C.; Campbell, James F.; Throne, James E.

doi:10.1016/j.anbehav.2009.10.022

Cited by 35 publications

(28 citation statements)

References 60 publications

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“…It has been known that the snout varies greatly in length among the different species of weevils because each snout is adapted to eating certain parts of plants (Guedes et al . ; Wilhelm et al . ).…”

Section: Discussionmentioning

confidence: 99%

Microstructure of mandibulate mouthparts in the greater rice weevil, Sitophilus zeamais (Coleoptera: Curculionidae)

Moon

2014

Entomological Research

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The greater rice weevil, Sitophilus zeamais, is a serious pest of stored grain. It chews a hole in the grain and deposits an egg inside. For the purpose of excavating a tunnel, these weevils are equipped with effective mandibulate mouthparts for penetrating and boring holes. The mouthparts of the weevil are a long slender snout, which consist of a labrum, a pair of mandibles, a pair of maxillae and a labium. Mothparts exhibit typical morphology of phytophagous coleopteran beetles and have characteristics of chewing mouthparts. Mandibles are connected to the head capsule through dicondyous articulation, which allows movement along one single rotating axis. Both labrum and labium are fused to the snout and form the upper and lower lips, respectively. Along the depressed surface of the snout, a number of short sensory hairs are sparsely arranged. The distal apexes of the maxillary and labial palpi are deeply depressed into a sensillar field, and only one type of the basiconic sensilla, which function as chemo-or gustatory receptors, occurs in both sexes.

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Section: Discussionmentioning

confidence: 99%

Microstructure of mandibulate mouthparts in the greater rice weevil, Sitophilus zeamais (Coleoptera: Curculionidae)

Moon

2014

Entomological Research

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“…Regardless, competition is recognized as an important phenomenon among grain beetles driving their natural selection and population regulation ( Smith and Lessells, 1985 ; Smith, 1990 , 1991 ), and has been tested in few species so far, but never in the case of T. granarium ( Nicholson, 1954 ; De Jong, 1976 ; Connell, 1983 ; Krebs, 2002 ). Moreover, despite the considerable number of studies that are available for competition in stored-product beetles, such studies were usually focused in intraspecific competition, by conducting parallel experiments of life table characteristics of single species ( Smith and Lessells, 1985 ; Smith, 1990 ; Horn, 1997 ; Guedes et al, 2010 ; Oliveira et al, 2015 ), and not interspecific competition (i.e., simultaneous presence of different species in the same substrate). The outcome of this competition is apparently determined by several biotic and abiotic conditions, including temperature and type of commodity, but there is still inadequate information regarding the effect of these conditions in competition of T. granarium with other major stored-grain insects.…”

Section: Introductionmentioning

confidence: 99%

Invader Competition with Local Competitors: Displacement or Coexistence among the Invasive Khapra Beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), and Two Other Major Stored-Grain Beetles?

et al. 2017

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Local potential competitor species are important determinants of the invasibility of an environment even when widely recognized invasive species are concerned since it may compromise its establishment. Thus, the outcome of the direct competition among the invasive khapra beetle, Trogoderma granarium, and the cosmopolitan species lesser grain borer, Rhyzopertha dominica and rice weevil, Sitophilus oryzae, and thus the likelihood of establishment of T. granarium under their co-occurrence, was here explored in paddy rice and wheat, at temperatures between 25 and 35°C and through 200 days of storage. Insect infestations were higher in wheat rather than in paddy rice. Trogoderma granarium was unable to displace any of the competing species under two and three-species competition experiments retaining lower adult population than both local competitors at the lowest temperature level. Rhyzopertha dominica prevailed in paddy rice, while S. oryzae prevailed in wheat. Paradoxically, T. granarium adults retained low population growth but contributed more for the total frass production and grain loss, much more than that recorded for R. dominica. Nonetheless, T. granarium larvae exhibited high population numbers 130 days after the introduction of the parental individuals. At higher temperature levels (30 and 35°C) the numbers of T. granarium larvae were extremely high even after 65 days, while the numbers of the other two species rapidly declined. Interestingly, the simultaneous presence of R. dominica and S. oryzae was beneficial for the population growth of T. granarium. Consequently, T. granarium has the ability to outperform other primary stored-product insects at high temperatures, while its presence at low temperatures remains for long periods apparently unaffected by other co-occurring species. Hence, T. granarium, in wheat, is able to outcompete other major species of stored-product insects at elevated temperatures, while at 25°C this species can maintain low numbers of individuals for long periods, which can rapidly produce population outbursts when the prevailing conditions are suitable for its development.

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“…Numerous studies have shown that seed size greatly influences the oviposition decisions of adult seed beetles, and that size can often be used as a good indicator of seed quality for the developing larvae (Janzen, 1977;Fox and Czesak, 2000;Guedes et al, 2010;Chen et al, 2015b;Oliveira et al, 2015). Indeed, for seeds in the genus Phaseolus, seed size has been found to be the best predictor of oviposition choices (Moreira et al, 2015;Hernandez-Cumplido et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

The Large Seed Size of Domesticated Lima Beans Mitigates Intraspecific Competition among Seed Beetle Larvae

2017

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The domestication of beans has selected for larger seeds in cultivated plants compared to their wild relatives. This has not only resulted in an enhanced resource for humans, but also for the insects that feed on these seeds. Seed beetles that attack wild and cultivated seeds often lay several eggs on a single seed. We hypothesized that the larger seed size of domesticated beans will mitigate the competition among the larvae that hatch from these eggs, with important implications for their growth and survival. To test this we examined how seed size of wild and cultivated Phaseolus lunatus (lima bean) affect the performance of the Mexican bean weevil Zabrotes subfasciatus, an important pest of beans in Mexico. A negative correlation was found between the initial number of eggs on a seed and the weight of female beetles that emerged, but only for the much smaller wild seeds. Similarly, beetle survival was found to be negatively correlated with competition intensity only on wild seeds. Our results imply that by selecting for larger seeds, domestication of P. lunatus has reduced the intensity of intraspecific larval competition of Z. subfasciatus.

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Contest behaviour of maize weevil larvae when competing within seeds

Cited by 35 publications

References 60 publications

Microstructure of mandibulate mouthparts in the greater rice weevil, Sitophilus zeamais (Coleoptera: Curculionidae)

Microstructure of mandibulate mouthparts in the greater rice weevil, Sitophilus zeamais (Coleoptera: Curculionidae)

Invader Competition with Local Competitors: Displacement or Coexistence among the Invasive Khapra Beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), and Two Other Major Stored-Grain Beetles?

The Large Seed Size of Domesticated Lima Beans Mitigates Intraspecific Competition among Seed Beetle Larvae

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