Kasey D. Fowler-FinnaBehavioral and Molecular Ecology Group, Department of Biological Sciences, University of Wisconsin-Milwaukee, Lapham Hall, 3209 N Maryland Avenue, Milwaukee WI, 53201, USA
Owen G. MilleraBehavioral and Molecular Ecology Group, Department of Biological Sciences, University of Wisconsin-Milwaukee, Lapham Hall, 3209 N Maryland Avenue, Milwaukee WI, 53201, USA
When mating interactions are influenced by multiple sources of selection, they may involve multiple stages of mate assessment. At each stage, a different set of morphological and behavioural traits may be important in determining the outcome of the interaction. Here, we test the potential for multiple sources of selection to shape mating interactions inLeiobunum vittatum harvestmen, commonly known as ‘daddy longlegs’. We provide a qualitative and quantitative study of mating interactions, and investigate the influence of multiple morphological traits on each of several distinct stages of their mating interactions. Mating interactions start with a struggle between males and females during which the male attempts to secure the females in a mating embrace. Success at this stage depends on the length of the male’s clasping pedipalps: those with shorter pedipalps (and thus greater mechanical advantage) were more successful. Male size relative to the female determines how quickly males achieve this embrace. Mating interactions then proceed to tactile exchanges between males and females, indicating the potential for mutual mate choice and/or peri- and post-copulatory selection. We found no morphological predictors of the timing of these later stages of the mating interactions, and suggest that the exchange of a nuptial gift is important for the dynamics of these stages. Overall, our results highlightL. vittatum as a potentially highly informative group for studying how traits involved in mating are shaped by the interaction of selection across multiple stages in mating interactions.
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AlexanderR.D.,MarshallD.,CooleyJ. (1997).Evolutionary perspectives on insect mating. — In:The evolution of mating systems in insects and arachnids. (ChoeJ.C.,CrespiB.J., eds).Cambridge University Press,Cambridge, p. 4-31.
ApontesP.,BrownC.A. (2005).Between-sex variation in running speed and a potential cost of leg autotomy in the wolf spiderPirata sedentarius. —Am. Midl. Nat.154:115-125.
BrennanP.L.R.,PrumR.O. (2012).The limits of sexual conflict in the narrow sense: new insights from waterfowl biology. —Phil. Trans. Roy. Soc. B367:2324-2338.
BurnsM.,HedinM.,ShultzJ.W. (2012).Molecular phylogeny of the leiobunine harvestment of eastern North American (Opiliones: Sclerosomatidae: Leiobuninae). —Mol. Phylogenet. Evol.63:291-298.
BurnsM.,HedinM.,ShultzJ.W. (2013).Comparative analyses of reproductive structures in harvestmen (Opiliones) reveal multiple transitions from courtship to precopulatory antagonism. —PLoS One8:e66767.
CorderoC.,EberhardW.G. (2003).Female choice of sexually antagonistic male adaptations: a critical review of some current research. —J. Evol. Biol.1:1-6.
Costa-SchmidtL.E.,CaricoJ.E.,de AraujoA.M. (2008).Nuptial gifts and sexual behavior in two species of spider (Araneae, Trechaleiodae, Paratrechalea). —Naturwissenschaften95:731-739.
MachadoG.,Macías-OrdóñezG. (2007).Reproduction. — In:Harvestmen: the biology of Opiliones (Pinto-da-RochaR.,MachadoG.,GiribetG., eds).Harvard University Press,Cambridge, MA, p. 414-454.
Macías-OrdóñezR.,MachadoG.,Pérez-GonzálezA.,ShultzA.W. (2010).Genitalic evolution in Opiliones. — In:The evolution of primary sexual character in animals (LeonardJ.,Cordoba-AguilarA., eds).Oxford University Press,Oxford.
McGheeC.R. (1970). The sacculate and lanceolate groups of the genus Leiobunum (Arachnida; Phalangida, Phalangiidae) in the Eastern United States. — PhD dissertation, Virginia Polytechnic Institute and State University, Blacksburg, VA.
MoraG. (1990).Parental care in a neotropical harvestman,Zygopachylus albomarginis (Arachnida: Gonyleptidae). —Anim. Behav.39:582-593.
PrestonB.T.,StevensonI.R.,PembertonJ.M.,ColtmanD.W.,WilsonK. (2003).Overt and covert competition in a promiscuous mammal: the importance of weaponry and testes size to male reproductive success. —Proc. Roy. Soc. Lond. B: Biol. Sci.270:633-640.
RoweL.,ArnqvistG.,SihA.,KrupaJ. (1994).Sexual conflict and the evolutionary ecology of mating patterns: water striders as a model system. —Trends Ecol. Evol.9:289-293.
RoweL.,WestlakeK.P.,CurrieD.C. (2006).Functional significance of elaborate secondary sexual traits and their evolution in the water strider genus Rheumatobates. —Can. Entomol.138:568-577.
ShultzJ.W. (2005).Preliminary analysis of mating inLeiobunum nigripes (Opiliones) and diversification of male reproductive structures inLeiobunum. —Am. Arachnol.72:11.
WillemartR.H.,FarineJ.P.,PerettiA.V.,GnaspiniP. (2006).Behavioral roles of the sexually dimorphic structures in the male harvestman,Phalangium opilio (Opiliones, Phalangiidae). —Can. J. Zool.84:1763-1774.
WillemartR.H.,OssesF.,CheliniM.C.,Macías-OrdóñezR.,MachadoG. (2009).Sexually dimorphic legs in a neotropical harvestman (Arachnida, Opiliones): ornament or weapon? —Behav. Proc.80:51-59.
Kasey D. Fowler-FinnaBehavioral and Molecular Ecology Group, Department of Biological Sciences, University of Wisconsin-Milwaukee, Lapham Hall, 3209 N Maryland Avenue, Milwaukee WI, 53201, USA
Owen G. MilleraBehavioral and Molecular Ecology Group, Department of Biological Sciences, University of Wisconsin-Milwaukee, Lapham Hall, 3209 N Maryland Avenue, Milwaukee WI, 53201, USA
When mating interactions are influenced by multiple sources of selection, they may involve multiple stages of mate assessment. At each stage, a different set of morphological and behavioural traits may be important in determining the outcome of the interaction. Here, we test the potential for multiple sources of selection to shape mating interactions inLeiobunum vittatum harvestmen, commonly known as ‘daddy longlegs’. We provide a qualitative and quantitative study of mating interactions, and investigate the influence of multiple morphological traits on each of several distinct stages of their mating interactions. Mating interactions start with a struggle between males and females during which the male attempts to secure the females in a mating embrace. Success at this stage depends on the length of the male’s clasping pedipalps: those with shorter pedipalps (and thus greater mechanical advantage) were more successful. Male size relative to the female determines how quickly males achieve this embrace. Mating interactions then proceed to tactile exchanges between males and females, indicating the potential for mutual mate choice and/or peri- and post-copulatory selection. We found no morphological predictors of the timing of these later stages of the mating interactions, and suggest that the exchange of a nuptial gift is important for the dynamics of these stages. Overall, our results highlightL. vittatum as a potentially highly informative group for studying how traits involved in mating are shaped by the interaction of selection across multiple stages in mating interactions.
Title:
Mating in the harvestman Leiobunum vittatum (Arachnida: Opiliones): from premating struggles to solicitous tactile engagement
