Convergent evolution in the colour polymorphism ofSelkirkiellaspiders (Theridiidae) from the South American temperate rainforest
| Autor: | Rosemary G. Gillespie, Darko D. Cotoras, David R. Lindberg, Geoff S. Oxford, Peter J. P. Croucher, Michael S. Brewer |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine genetic structures Theridion grallator biology Phylogenetic tree Frequency-dependent selection Theridiidae Zoology Context (language use) biology.organism_classification 010603 evolutionary biology 01 natural sciences 03 medical and health sciences 030104 developmental biology Convergent evolution Molecular phylogenetics Enoplognatha ovata Ecology Evolution Behavior and Systematics |
| Zdroj: | Biological Journal of the Linnean Society. |
| ISSN: | 0024-4066 |
| DOI: | 10.1111/bij.12908 |
| Popis: | Convergent evolution tends to lead to similar phenotypic responses to the same selective pressures. However, when the phenotypic response is polymorphic, it is less clear how evolutionary convergence can lead to parallel diversity across species and populations. The present study focuses on South American spiders in the genus Selkirkiella (Theridiidae), which are shown to be polymorphic for colour. We (1) examine the number of morphs and their correspondence across taxa and (2) place the phenomenon in a phylogenetic context to determine whether the colour polymorphism in Selkirkiella albogutatta from the Juan Fernandez archipelago represents a case of independent evolution and convergence, or whether there is common ancestry with other colour-polymorphic theridiids. Regarding the latter question, we also examine colour morphs in a related species (Selkirkiella luisi) from continental areas. We show that S. alboguttata and S. luisi have six and two morphs, respectively. The rank-order of morph frequencies in both species is approximately similar to that reported in other polymorphic theridiids. A molecular phylogeny supports previous work and shows that the colour polymorphism in Selkirkiella species appears to be a case of convergent evolution of a diverse colour polymorphism at the family level. |
| Databáze: | OpenAIRE |
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