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8 results for “Polygamy”
Data from: Polygamy and an absence of fine-scale structure in Dendroctonus ponderosae (Hopk.) (Coleoptera: Curcilionidae) confirmed using molecular markers
An understanding of mating systems and fine-scale spatial genetic structure is required to effectively manage forest pest species such as Dendroctonus ponderosae (mountain pine beetle). Here we used genome-wide single-nucleotide polymorphisms to assess the fine-scale genetic structure and mating system of D. ponderosae collected from a single stand in Alberta, Canada. Fine-scale spatial genetic structure was absent within the stand and the majority of genetic variation was best explained at the individual level. Relatedness estimates support previous reports of pre-emergence mating. Parentage assignment tests indicate that a polygamous mating system better explains the relationships among individuals within a gallery than the previously reported female monogamous/male polygynous system. Furthermore, there is some evidence to suggest that females may exploit the galleries of other females, at least under epidemic conditions. Our results suggest that current management models are likely to be effective across large geographic areas based on the absence of fine-scale genetic structure.
FIG. 3 in Spawning Behavior in a Non-Teleost Actinopterygian: Genetic Evidence for Both Monogamy and Polygamy in Amia
FIG. 3. Mating characteristics of bowfin relative to other nesting species with uniparental male care. Data represented by gray bars are from the review by Coleman and Jones (2011). Bowfin from this study are represented in black. Note that for bowfin relative to other species, the percentage of cuckolded nests is on the low side, that cases of multiple paternity are less common than for many species, and that the mean number of females spawning in a nest is relatively low.
FIG. 2 in Spawning Behavior in a Non-Teleost Actinopterygian: Genetic Evidence for Both Monogamy and Polygamy in Amia
FIG. 2. Bowfin eggs, larva, and fry from Big Bay Creek, New York. (A) Freshly laid bowfin eggs are about 2.2 mm in diameter and white for about the first 24 hrs (photo by Emily Funk using a Nikon D90 camera; scale bar ¼ 5 mm). (B) After about 24 hours, eggs turned greenish gray and are more cryptic (photo by Emily Funk using a Nikon D90 camera; scale bar ¼ 5 mm). (C) Bowfin larva, 7.8 mm long, which is largely translucent except for yolk, eyes, and early pigmentation (photo by Emily Funk using a DP25 camera fitted to an Olympus SZX16 dissection microscope; scale bar ¼ 1 cm). (D) Fully black, free-swimming fry in fry ball. Fry are approximately 40 mm in length (underwater photo by A. McCune using an Olympus Stylus Tough 8000 camera).
FIG. 1 in Spawning Behavior in a Non-Teleost Actinopterygian: Genetic Evidence for Both Monogamy and Polygamy in Amia
FIG. 1. Roving and guarding male bowfin in spawning coloration. (A) Male swimming in Big Bay Creek, New York. Note bright green fins and the prominent ocellus on the caudal peduncle, both characteristic of spawning coloration (photo copyright David O. Brown, using scuba). (B) Male lying on constructed nest with stripped roots (photo by A. McCune using an Olympus Stylus Tough 8000 camera). (C) Male guarding fry on his nest. Black fry are seen in contrast to the brown substrate and are in a round patch underneath the male from approximately the snout to just anterior to the pelvic fins (photo by A. McCune).
Data from: Polygamy slows down population divergence in shorebirds
Sexual selection may act as a promotor of speciation since divergent mate choice and competition for mates can rapidly lead to reproductive isolation. Alternatively, sexual selection may also retard speciation since polygamous individuals can access additional mates by increased breeding dispersal. High breeding dispersal should hence increase gene flow and reduce diversification in polygamous species. Here we test how polygamy predicts diversification in shorebirds using genetic differentiation and subspecies richness as proxies for population divergence. Examining microsatellite data from 79 populations in ten plover species (Genus: Charadrius) we found that polygamous species display significantly less genetic structure and weaker isolation-by-distance effects than monogamous species. Consistent with this result, a comparative analysis including 136 shorebird species showed significantly fewer subspecies for polygamous than for monogamous species. By contrast, migratory behaviour neither predicted genetic differentiation nor subspecies richness. Taken together, our results suggest that dispersal associated with polygamy may facilitate gene flow and limit population divergence. Therefore, intense sexual selection, as occurs in polygamous species, may act as a brake rather than an engine of speciation in shorebirds. We discuss alternative explanations for these results and call for further studies to understand the relationships between sexual selection, dispersal and diversification.
Data from: Polygamy and an absence of fine-scale structure in Dendroctonus ponderosae (Hopk.) (Coleoptera: Curcilionidae) confirmed using molecular markers
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Data from: Genetic evidence for polygamy as a mating strategy in Caiman crocodilus
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Data from: Polygamy slows down population divergence in shorebirds
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