Both host-plant phylogeny and chemistry have shaped the African seed-beetle radiation

Kergoat, Gaël J.; Delobel, Alex; Fédière, Gilles; Rü, Bruno Le; Silvain, Jean‐François

doi:10.1016/j.ympev.2004.12.024

Cited by 60 publications

(64 citation statements)

References 61 publications

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“…Feeding specialization thus constitutes a major factor promoting species diversity, of which insects, and Coleoptera in particular, are a paradigmatic example. In beetles, high species richness is frequently associated with phytophagy and diversity of host plants (Farrell and Mitter 1998;Kergoat et al 2005;Hunt et al 2007). Host plantherbivore interactions may result in differences in allometric shape or in body size in response to specialized feeding, which may lead to species diversification (e.g., Farrell and Mitter 1998;Kergoat et al 2005;Toju and Sota 2006a; see Strauss and Zangerl 2002 for a review).…”

Section: Introductionmentioning

confidence: 99%

Complex selection on life-history traits and the maintenance of variation in exaggerated rostrum length in acorn weevils

2011

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Trophic interactions can trigger the development of exaggerated specialized characters and promote morphological diversification. For example, acorn weevils (genus Curculio) present strikingly long rostrums, which are used by females to perforate oviposition holes through the seed coat. Species exhibiting longer rostrums are known to exploit larger acorns, and therefore rostrum length is thought to be subject to selection to match the preferred acorn type. However, rostrum length is strongly correlated with body size, and morphological divergence could result from either selection on rostrum length for optimal food exploitation or from other pressures acting on body size. We collected infested acorns at oak forests where the large Curculio elephas and the small-bodied Curculio glandium co-occur. There were no interspecific differences in adult female body size to rostrum length allometric relationships, and rostrum length is equally correlated with body size in either species. MtDNA-based species identification showed that C. glandium larvae were present within acorns of all sizes, whereas C. elephas larvae were restricted to acorns above a minimum size, irrespective of oak species. Hence, exploitation of large acorns can hardly have triggered rostrum enlargement, as the small sized C. glandium adults (with short rostrums) could perforate and oviposit in both small and large acorns. Rather, increased rostrum length is probably a by-product of the larger body sizes of individuals emerging from bigger acorns, which allow increased larval size and enhance larval survival likelihood. Summarizing, when exaggerated feeding traits co-vary with other body features, interspecific morphological variability may result from contrasting selective pressures acting on these correlated characters.

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Section: Introductionmentioning

confidence: 99%

Complex selection on life-history traits and the maintenance of variation in exaggerated rostrum length in acorn weevils

2011

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“…Attempts to identify and evaluate factors involved in cladogenesis and species diversiWcation in several groups of seed beetles have recently been undertaken (Kergoat et al , 2005aMorse and Farrell 2005). Updated biological data on Bruchinae (identiWcation of new host plants and clariWcation of the host status of plants mentioned in older records) were given by Delobel andDelobel (2003, 2005).…”

Section: Introductionmentioning

confidence: 99%

Dietary specialization in European species groups of seed beetles (Coleoptera: Bruchidae: Bruchinae)

Delobel

2006

Oecologia

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Because of their particular biology, seed beetles exhibit a strong relationship with their larval host plants. In Europe, however, field data have long been scarce and unreliable. The results of Legume seed collections of nearly 1,000 samples belonging to 292 species from various locations in Europe are summarized. The status of current Bruchidius species groups is amended on morphological and phylogenetic bases. Recent advances in the knowledge of phylogenetic structures of both Fabaceae and Bruchinae provide a new picture of Bruchinae-Fabaceae interactions. It reveals a certain level of host conservatism. The hypothesis of radiative adaptation seems the most compatible with observed data.

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“…This was confirmed 20 years later by several phylogenetic studies (e.g., Miller et al, 2003;Miller & Seigler, 2012), resulting in the placement of the African acacias into different genera (Senegalia and Vachellia) (e.g., Kyalangalilwa et al, 2013). The seeds of these genera are also utilised by spermophagous beetles, but by an entirely different group, the subfamily Bruchinae of Chrysomelidae (e.g., Kergoat et al, 2005Kergoat et al, , 2011Delobel & Le Ru, 2015;Yirgu, 2016).…”

Section: Host Associations Of Melanteriusmentioning

confidence: 83%

“…The records from the remaining 37 Acacia species are based on longer series of weevils, and often repeated collections, and many of these are likely to represent true associations. Proper assessment of these indicated associations, and of expected ones with other Acacia species, requires an extensive rearing program-the effort of rearing bruchines from seeds of 300 fabaceous plant species in Africa required numerous seed collectors and rearers and spanned 10 years (Kergoat et al, 2005).…”

Section: Host Associations Of Melanteriusmentioning

confidence: 99%

Feather mites of the subfamily Proctophyllodinae (Acari: Proctophyllodidae) from passerines (Aves: Passeriformes) in Costa Rica

Mironov

Literák

Sychra

et al. 2017

Zootaxa

948

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No part of this publication may be reproduced, stored, transmitted or disseminated, in any form, or by any means, without prior written permission from the publisher, to whom all requests to reproduce copyright material should be directed in writing.This authorization does not extend to any other kind of copying, by any means, in any form, and for any purpose other than private research use. AbstractThis paper presents the results of a three-year collecting and research project on Melanterius weevils in Australia, aimed mainly at discovering new host associations and assessing their fit to the emerging reconstruction of phylogenetic relationships in the large genus Acacia. A revised and extended diagnosis of the genus Melanterius is provided, as well as characters differentiating the genus from related and/or similar Australian genera classified in the tribe Cleogonini. Given the size (79 species) and morphological variation of Melanterius, and to facilitate the assessment of co-evolutionary patterns between the weevils and their hosts, the genus is divided into six tentative species groups characterised by particular morphological traits. New host and locality data are recorded for 23 species, including five species described as new to science, M. abbreviatus sp. n., M. curvistriatus sp. n., M. psittacoides sp. n., M. pungalinae sp. n. and M. tesseymani sp. n. For each species, salient characters and a summary of known host plant species are provided. Melanterius tasmaniensis (Lea, 1909) comb. et stat. n. is raised from a subspecies of Melanteriosoma costatum to species level. All recorded host associations of Melanterius known to us are summarised, including those published, those recorded on label data associated with specimens in the Australian National Insect Collection and those recorded during this study. These host records are differentiated into true host associations (based on specimens reared from seeds), putative associations (based on long series of specimens collected from plants) and coincidental associations (based on single specimens collected from PINZÓN-NAVARRO ET AL.4 · Zootaxa 4298 (1) © 2017 Magnolia Press plants). Altogether, Melanterius weevils are recorded from 71 species of Acacia, still a small number in view of the ca. 1000 described species of Acacia, but it is likely that many or most of the other species are also hosts of Melanterius species or of the closely related genus Lybaeba. The pattern of host associations in evidence indicates that most species of Melanterius are not host-specific, developing in the seeds of a number of apparently related Acacia species. Nevertheless, several Melanterius species appear to have the potential to be employed as biocontrol agents if their main hosts become invasive weeds.

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Both host-plant phylogeny and chemistry have shaped the African seed-beetle radiation

Cited by 60 publications

References 61 publications

Complex selection on life-history traits and the maintenance of variation in exaggerated rostrum length in acorn weevils

Complex selection on life-history traits and the maintenance of variation in exaggerated rostrum length in acorn weevils

Dietary specialization in European species groups of seed beetles (Coleoptera: Bruchidae: Bruchinae)

Feather mites of the subfamily Proctophyllodinae (Acari: Proctophyllodidae) from passerines (Aves: Passeriformes) in Costa Rica

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