Strong cryptic prezygotic isolation despite lack of behavioral isolation between sympatric host races of the leaf beetleLochmaea capreae
| Autor: | Klaus Reinhold, Leif Engqvist, Shaghayegh Soudi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Ecology Zoology Reproductive isolation Biology Incipient speciation Fecundity 010603 evolutionary biology 01 natural sciences Sperm Gene flow 03 medical and health sciences 030104 developmental biology Sympatric speciation Sexual selection Genetics Mating General Agricultural and Biological Sciences Ecology Evolution Behavior and Systematics |
| Zdroj: | Evolution. 70:2889-2898 |
| ISSN: | 0014-3820 |
| Popis: | One of the major goals in speciation research is to understand which isolation mechanisms form the first barriers to gene flow. This requires examining lineages that are still in the process of divergence or incipient species. Here, we investigate the presence of behavioral and several cryptic barriers between the sympatric willow and birch host races of Lochmaea capreae. Behavioral isolation did not have any profound effect on preventing gene flow. Yet despite pairs mating indiscriminately, no offspring were produced from the heterospecific matings between birch females and willow males due to the inability of males to transfer sperm to females. We found evidence for differences in genital morphology that may contribute to failed insemination attempts during copulation. The heterospecific matings between willow females and birch males resulted in viable offspring. Yet fecundity and hatchability was remarkably reduced, which is likely the result of lower efficiency in sperm transportation and storage and lower survival of sperm in the foreign reproductive tract. Our results provide evidence for the contribution of several postmating-prezygotic barriers that predate behavioral isolation and act as primary inhibitors of gene flow in this system. This is a surprising, yet perhaps often overlooked feature of barriers acting early in sympatric speciation process. |
| Databáze: | OpenAIRE |
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