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Accepted Manuscript Accepted Manuscript The evolution of food preferences in Coccinellidae José Adriano Giorgi, Natalia J. Vandenberg, Joseph V. McHugh, Juanita A. Forrester, S. Adam Ślipiński, Kelly B. Miller, Lori R. Shapiro, Michael F. Whiting PII: S1049-9644(09)00145-5 DOI: 10.1016/j.biocontrol.2009.05.019 Reference: YBCON 2291 To appear in: Biological Control Received Date: 24 December 2008 Revised Date: 21 May 2009 Accepted Date: 25 May 2009 Please cite this article as: Giorgi, J.A., Vandenberg, N.J., McHugh, J.V., Forrester, J.A., Ślipiński, S.A., Miller, K.B., Shapiro, L.R., Whiting, M.F., The evolution of food preferences in Coccinellidae, Biological Control (2009), doi: 10.1016/j.biocontrol.2009.05.019 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT 1 The evolution of food preferences in Coccinellidae 2 3 José Adriano Giorgi1*, Natalia J. Vandenberg2, Joseph V. McHugh1, Juanita A. Forrester1, 4 S. Adam Ślipiński3, Kelly B. Miller4, Lori R. Shapiro5, and Michael F. Whiting6 5 6 1 Department of Entomology, University of Georgia, Athens, GA 30602, USA 7 2 USDA-ARS, Systematic Entomology Lab, c/o National Museum of Natural History, Smithsonian 8 Institution, P.O. Box 37012, MRC-168, Washington, DC 20013, USA 9 3 CSIRO Entomology, GPO Box 1700, Canberra, ACT 2601, Australia 10 4 Department of Biology, University of New Mexico, 167 Castetter Hall, MSC03 2020, 11 Albuquerque, NM, 87131, USA 12 5 Department of Entomology, The Pennsylvania State University, 509 Ag. Sciences & Industries 13 Building, University Park, PA 16802, USA 14 6 Department of Biology and M. L. Bean Life Science Museum, 693 Widtsoe Building, Brigham 15 Young University, Provo, UT 84602, USA 16 *Corresponding author: 706-542-2279 +1 ;[email protected] 17 Key words: 18 lady beetles, ladybirds, ladybugs, food preference, prey, evolution, trophic 19 shifts, phylogeny, Coleoptera, Coccinellidae, Cerylonid Series, Cucujoidea 20 21 1 ACCEPTED MANUSCRIPT 22 ABSTRACT 23 Despite the familiarity and economic significance of Coccinellidae, the family has thus 24 far escaped analysis by rigorous phylogenetic methods. As a result, the internal classification 25 remains unstable and there is no framework with which to interpret evolutionary events within 26 the family. Coccinellids exhibit a wide range of preferred food types, spanning kingdoms and 27 trophic levels. To provide an evolutionary perspective on coccinellid feeding preferences, we 28 performed a phylogenetic analysis of 62 taxa based on the ribosomal nuclear genes 18S and 28S. 29 The entire dataset consists of 3,957 aligned nucleotide sites, 787 of which are parsimony 30 informative. Bayesian and parsimony analyses were performed. Host preferences were mapped 31 onto the Bayesian tree to infer food preference transitions. Our results indicate that the ancestral 32 feeding condition for Coccinellidae is coccidophagy. From the ancestral condition, there have 33 been at least three transitions to aphidophagy and one transition to leaf-eating phytophagy. A 34 second transition to leaf-eating phytophagy arose within an aphidophagous/pollinivorous clade. 35 The mycophagous condition in Halyziini originated from aphidophagy. Our findings suggest 36 that polyphagy served as an evolutionary stepping stone for primarily predaceous groups to 37 adopt new feeding habits. The analyses recovered a clade comprising Serangiini plus 38 Microweiseini as the sister group to the rest of Coccinellidae. The subfamilies Coccinellinae and 39 Epilachninae are monophyletic; however, Sticholotidinae, Chilocorinae, Scymninae and 40 Coccidulinae are paraphyletic. Our results do not support the traditional view of phylogenetic 41 relationships among the coccinellid subfamilies. These results indicate that the current 42 classification system poorly reflects the evolution of Coccinellidae and therefore requires 43 revision. 44 2 ACCEPTED MANUSCRIPT 45 1. Introduction 46 47 Of all the predaceous beetle groups, perhaps the most familiar to non-specialists is the 48 lady beetle family, Coccinellidae. It is widely known that this charismatic group includes many 49 beneficial species that are voracious predators of pestiferous aphids and scale insects. Indeed, 50 the first successful classical biological control effort involved the introduction of the vedalia 51 beetle, Rodolia cardinalis (Mulsant), to control cottony cushion scale, Icerya purchasi Maskell 52 (Heteroptera: Margarodidae), on citrus plants in California during the late 1880’s (Caltagirone 53 and Doutt, 1989). 54 Despite this familiar stereotype of the family, Coccinellidae is far from homogeneous 55 with respect to feeding behavior (Figs. 1-8, Table 1). While most coccinellids are predaceous, 56 some are specialists on plant material (e.g., leaves), whereas others feed on fungi (Sutherland and 57 Parrella, 2009, this issue). Even among the predaceous coccinellids, feeding preferences vary 58 widely. Most of the preferred prey belong to the hemipteran suborder Sternorrhyncha (aphids, 59 aldelgids, scales, mealybugs, whiteflies, and psyllids) (Hodek and Honěk, 2009; Obrycki et al., 60 2009, this issue), but there are significant deviations from this pattern. Some coccinellid species 61 are known to feed on ants (Hymenoptera: Formicidae) (Harris, 1921; Pope and Lawrence, 1990; 62 Samways et al., 1997; Majerus et al., 2007). Other coccinellid species are specialists on non- 63 insects; for example, all members of the tribe Stethorini prey on tetranychid mites (Biddinger et 64 al., 2009, this issue). Thus, the evolution of Coccinellidae includes feeding transitions that cross 65 kingdoms of life (Plant, Animal, Fungus) and trophic levels (e.g., herbivore, primary carnivore). 66 Some feeding behaviors of Coccinellidae are especially interesting given the 67 phylogenetic position of the family. Coccinellidae is part of a monophyletic group, the 68 Cerylonid Series (C. S.), which includes seven other families of cucujoid beetles: Alexiidae, 3 ACCEPTED MANUSCRIPT 69 Bothrideridae, Cerylonidae, Corylophidae, Discolomatidae, Endomychidae, and Latridiidae 70 (Crowson, 1955; Robertson et al., 2008). C. S. includes approximately 9,600 species divided 71 among 646 genera (Robertson et al., 2008). Within this large and diverse clade, Coccinellidae is 72 remarkable for many of its feeding habits. In the C. S. clade, strict phytophagy is extremely rare 73 and possibly limited to the coccinellid subfamily Epilachninae and the coccinelline genus Bulaea 74 Mulsant, although there is an isolated report of an endomychid, Eumorphus quadriguttatus 75 (Illiger), inflicting damage on betel pepper plants, Piper betel (L.) (Piperaceae) (Mondal et al., 76 2003). 77 Even the predominantly predatory habit of Coccinellidae is odd because it constitutes a 78 major exception to the general feeding patterns of the C. S. clade. The other seven C. S. families 79 are primarily mycophagous, with isolated transitions to predation or parasitism being known for 80 only two groups, the genus Saula Gerstaecker (Endomychidae) (Sasaji, 1978; Takagi and Ogata, 81 1985; Wen, 1995; Takagi, 1999; Leschen, 2000; Chien et al., 2002) and the subfamily 82 Bothriderinae (Bothrideridae) (Crowson, 1981). Saula japonica Gorham preys mainly on scale 83 insects, but is known to feed occasionally on Aleyrodidae (Hemiptera) and Acari (Sasaji, 1978). 84 Bothriderinae are ectoparasites or predators of the immature stages of wood-dwelling Coleoptera 85 and Hymenoptera (Crowson, 1981; Lawrence, 1991). 86 Given the relevance of coccinellids for biological control, much attention has been given 87 to documenting feeding habits within the family. Although we now have a rudimentary 88 understanding of the food preferences for many species of Coccinellidae, the broad scale 89 evolutionary patterns of these traits remain unclear. 90 The lack of a phylogenetic framework for the family remains an impediment to 91 understanding the general feeding patterns that have been observed. Since the advent of modern 4 ACCEPTED MANUSCRIPT 92 phylogenetic theory and practice, there have been a few attempts to address the higher-level 93 phylogenetic relationships of Coccinellidae (Sasaji, 1971a; Yu, 1994; Kovář, 1996). 94 Unfortunately, these studies lack a broad taxonomic representation and did not utilize modern 95 phylogenetic methodologies. 96 The goal of this contribution is to conduct a rigorous phylogenetic analysis of 97 Coccinellidae to provide a framework within which to interpret the evolution of feeding patterns 98 for the family. A general overview of coccinellid classification, phylogeny, and food preferences 99 is provided. Comprehensive treatments of these subjects have been published recently by Hodek 100 and Honěk (1996) (food preferences and classification), Sloggett and Majerus (2000) (food 101 preferences), Ślipiński (2007) (food preferences and classification), and Vandenberg (2002) 102 (classification). 103 104 1.1. Food preference. Coccinellids consume many of the same foods as larvae and 105 adults (Majerus, 1994; Hodek, 1996; Vandenberg, 2002). Indirectly, the female even selects the 106 first meals for her offspring
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