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64 results for “reproductive barriers”
Intraspecific variation in reproductive barriers between two closely-related Arabidopsis sister species
<p>Reproductive isolation (RI) is a critical component of speciation and varies strongly in timing and strength among different sister taxa, depending e.g.<em>,</em> on the geography of speciation and divergence time. However, these factors may also produce variation in timing and strength among populations within species. Here we tested for variation in the expression of RI among replicate population pairs between the sister taxa <em>Arabidopsis lyrata</em> subsp. <em>lyrata</em> and <em>A. arenicola</em>. While the former is predominantly outcrossing, the latter is predominantly selfing<em>.</em> We focused on intrinsic prezygotic and postzygotic RI as both species occur largely in allopatry. We assessed RI by performing within-population crosses and interspecific between-population crosses, and by raising offspring. RI was generally high between all interspecific population pairs, but it varied in timing and strength depending on population history. Prezygotic isolation was strongest between the closest-related population pair, while early postzygotic isolation was high for all other population pairs. Furthermore, the timing and strength of RI depended strongly on cross direction. Our study provides empirical support that reproductive barriers between species are highly variable among population pairs and asymmetric within population pairs, and this variation seems to follow patterns typically described across species pairs.</p>
Data for: Faster evolution of a premating reproductive barrier is not associated with faster speciation rates in New World passerine birds
<p>Why are speciation rates so variable across the tree of life? One hypothesis is that this variation is explained by how rapidly reproductive barriers evolve. We tested this hypothesis by conducting a comparative study of the evolution of bird song, a premating barrier to reproduction. Speciation in birds is typically initiated when geographically isolated (allopatric) populations evolve reproductive barriers. We measured the strength of song as a premating barrier between closely related allopatric populations by conducting 2,339 field experiments to measure song discrimination for 175 taxon pairs of allopatric or parapatric New World passerine birds, and estimated recent speciation rates from a global molecular phylogeny of birds. Taxon pairs with high song discrimination in allopatry failed to regularly interbreed in parapatry, evidence that song discrimination is indeed an important reproductive barrier. However, evolutionary rates of song discrimination were not associated with recent speciation rates, and song discrimination evolves faster in suboscine passerines than their more species-rich sister clade, the oscines. Our findings support the long-held idea that song is a key premating reproductive barrier in birds, but show that faster evolution of this reproductive barrier between populations does not result in faster diversification betweeen species.</p>
Pervasive gene flow despite strong and varied reproductive barriers in swordtails
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Data for: Faster evolution of a premating reproductive barrier is not associated with faster speciation rates in New World passerine birds
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Strength in numbers? Cytotype frequency mediates effect of reproductive barriers in mixed-ploidy arrays.
When differentiated lineages come into contact, their fates depend on demographic and reproductive factors. These factors have been well-studied in taxa of the same ploidy, but less is known about sympatric lineages that differ in ploidy, particularly with respect to demographic factors. We assessed prezygotic, postzygotic, and total reproductive isolation in naturally-pollinated arrays of diploid-tetraploid and tetraploid-hexaploid population mixes of Campanula rotundifolia by measuring pollinator transitions, seed yield, germination rate, and proportion of hybrid offspring. Four frequencies of each cytotype were tested, and pollinators consistently overvisited rare cytotypes. Seed yield and F1 hybrid production were greater in 4X-6X arrays than 2X-4X arrays, while germination rates were similar, creating two distinct patterns of reproductive isolation. In 2X-4X arrays, postzygotic isolation was near-complete (3% hybrid offspring), and prezygotic isolation associated with pollinator preference is expected to facilitate the persistence of minority cytotypes. However, in 4X-6X arrays where postzygotic isolation permitted hybrid formation (44% hybrids), pollinator behavior drove patterns of reproductive isolation, with rare cytotypes being more isolated and greater gene flow expected from rare into common cytotypes. In polyploid complexes, both the specific cytotypes in contact and local cytotype frequency, likely reflecting spatial demography, will influence likelihood of gene exchange.
Migratory divides coincide with reproductive barriers across replicated avian hybrid zones above the Tibetan Plateau
<p>Migratory divides are proposed to be catalysts for speciation across a diversity of taxa. However, it is difficult to test the relative contributions of migratory behavior vs. other divergent traits to reproductive isolation. Comparing hybrid zones with and without migratory divides offers a rare opportunity to directly examine the contribution of divergent migratory behavior to reproductive barriers. We show that across replicate sampling transects of two pairs of barn swallow (Hirundo rustica) subspecies, strong reproductive isolation coincided with a migratory divide spanning 20 degrees of latitude. A third subspecies pair exhibited no evidence for a migratory divide and hybridized extensively. Within migratory divides, overwintering habitats were associated with assortative mating, implicating a central contribution of divergent migratory behavior to reproductive barriers. The remarkable geographic coincidence between migratory divides and genetic breaks supports a longstanding hypothesis that the Tibetan Plateau is a substantial barrier contributing to the diversity of Siberian avifauna.</p>
Mortality, growth and reproduction in five species of scleractinian corals following bleaching on the Great Barrier Reef in 1998
<p><em><strong>Study sites</strong></em>: These data were collected on the fringing reefs on the west side of Orpheus Island at Little Pioneer Bay (S18.594°, E146.485°), and the south-eastern side of Pelorus Island (S18.560°, E146.500°). Both islands are continental islands of the Palm Islands group in the Central Section of the Great Barrier Reef (GBR) Marine Park. These sites were amongst the worst affected by bleaching on the GBR following a sharp rise in sea surface temperature in the early months of 1998 (Berkelmans and Oliver 1999)</p> <p><em><strong>Species response to and recovery from high Sea Surface Temperature (SST</strong></em>): On 24 March 1998, all living colonies of <em>Acropora millepora </em>(n = 37) and <em>A. hyacinthus</em> (n = 28) in a 20 m × 40 m area between 3-4 m deep on the fringing reef of south-east of Pelorus Island were tagged to examine the patterns of response to, and recovery from, high SST. Similarly, all colonies of <em>Seriatopora hystrix</em> at 10 m depth within a 5 by 40 m area at this site were tagged (n=27). <em>Platygyra daedalea</em> (n = 28) and <em>Porites lobata </em>(n = 14) at 3-4 m depth in an area of approximately 50 m × 10 m were tagged at Little Pioneer Bay on Orpheus Island. The extent of colony bleaching was classified into 6 categories following Marshall and Baird (2000): 1 = no bleaching; 2 = uniformly pale; 3 = 1-50; 4 = 51-99; 5 = 100% bleached, and 6 = dead. Colonies that were fluorescent were categorized as 100% bleached. The extent of colony bleaching was estimated on six occasions following the initial report of bleaching at these sites on 10 February 1998 (Hoegh-Guldberg 1999).</p> <p><em><strong>Colony size:</strong></em> The size of <em>P. daedalea</em> colonies was determined from the maximum colony diameter of colonies at the initial census, which ranged from 10 to 40 cm. The projected area of the two species of <em>Acropora</em> was estimated from digitized photos of the colonies. The volume of <em>Seriatopora hystrix</em> was estimated by multiplying maximum diameter width x the perpendicular of maximum colony diameter x maximum colony height. All lengths were measured to the nearest cm with a tape measure.</p> <p><em><strong>Partial mortality</strong></em>: Partial mortality was estimated as the proportion of the pre-bleaching tissue lost within each colony, estimated to the nearest 5%. Values ranged from zero (escape from injury) through various amounts of injury (partial mortality) to 100% (whole-colony mortality). Alternatively, in <em>Seriatopora hystrix</em> a categorical scale identical to the bleaching categories described above was used.</p> <p>References</p> <p>Berkelmans R, Oliver JK (1999) Large-scale bleaching of corals on the Great Barrier Reef. Coral Reefs 18:55-60</p> <p>Hoegh-Guldberg O (1999) Climate change, coral bleaching and the future of the world's coral reefs. Mar Freshwat Res 50:839-866</p> <p>Marshall PA, Baird AH (2000) Bleaching of corals on the Great Barrier Reef: differential susceptibilities among taxa. Coral Reefs 19:155-163</p>
Data from: The effects of heterospecific mating frequency on the strength of cryptic reproductive barriers
Heterospecific mating frequency is critical to hybrid zone dynamics and can directly impact the strength of reproductive barriers and patterns of introgression. The ef‐ fectiveness of post‐mating prezygotic (PMPZ) reproductive barriers, which include reduced fecundity via heterospecific matings and conspecific sperm precedence, may depend on the number, identity and order of mates. Studies of PMPZ barriers suggest that they may be important in many systems, but whether these barriers are effective at realistic heterospecific mating frequencies has not been tested. Here, we evaluate the strength of cryptic reproductive isolation in two leaf beetles (Chrysochus auratus and C. cobaltinus) in the context of a range of heterospecific mating frequen‐ cies observed in natural populations. We found both species benefited from multiple matings, but the benefits were greater in C. cobaltinus and extended to heterospecific matings. We found that PMPZ barriers greatly limited hybrid production by C. aura- tus females with moderate heterospecific mating frequencies, but that their effec‐ tiveness diminished at higher heterospecific mating frequencies. In contrast, there was no evidence for PMPZ barriers in C. cobaltinus females at any heterospecific mating frequency. We show that integrating realistic estimates of cryptic isolation with information on relative abundance and heterospecific mating frequency in the field substantially improves our understanding of the strong directional bias in F1 production previously documented in the Chrysochus hybrid zone. Our results dem‐ onstrate that heterospecific mating frequency is critical to understanding the impact of cryptic post‐copulatory barriers on hybrid zone structure and dynamics, and that future studies of such barriers should incorporate field‐relevant heterospecific mat‐ ing frequencies.
Data from: Female mate choice is a reproductive isolating barrier in Heliconius butterflies
In sexually reproducing organisms, speciation involves the evolution of reproductive isolating mechanisms that decrease gene flow. Premating reproductive isolation, often the result of mate choice, is a major obstacle to gene flow between species because it acts earlier in the life cycle than other isolating barriers. While female choice is often considered the default mode in animal species, research in the butterfly genus Heliconius, a frequent subject of speciation studies, has focused on male mate choice. We studied mate choice by H. cydno females by pairing them with either conspecific males or males of the closely related species H. pachinus. Significantly more intraspecific trials than interspecific trials resulted in mating. Because male courtship rates did not differ between the species when we excluded males that never courted, we attribute this difference to female choice. Females also performed more acceptance behaviours towards conspecific males. Premating isolation between these two species thus entails both male and female mate choice, and female choice may be an important factor in the origin of Heliconius species.
Data from: Reproductive interference and fecundity affect competitive interactions of sibling species with low mating barriers: experimental and theoretical evidence
When allopatric species with incomplete prezygotic isolation come into secondary contact, the outcome of their interaction is not easily predicted. The parasitoid wasp Encarsia suzannae (iES), infected by Cardinium inducing cytoplasmic incompatibility (CI), and its sibling species E. gennaroi (EG), not infected by bacterial endosymbionts, may have diverged because of the complementary action of CI and asymmetric hybrid incompatibilities. Whereas postzygotic isolation is now complete due to sterility of F1 hybrid progeny, prezygotic isolation is still incipient. We set up laboratory population cage experiments to evaluate the outcome of the interaction between ES and EG in two pairwise combinations: iES vs. EG and cured ES (cES, where Cardinium was removed with antibiotics) vs. EG. We also built a theoretical model aimed at exploring the role of life history differences and asymmetric mating on competitive outcomes. In three of four cages in each treatment, ES dominated the interaction. We found evidence for reproductive interference, driven by asymmetric mating preferences, which gave a competitive edge to ES, the species that better discriminated against heterospecifics. However, we did not find the fecundity cost previously shown to be associated with Cardinium infection in iES. The model largely supported the experimental results. The finding of only a slight competitive edge of ES over EG in population cages suggests that in a more heterogeneous environment the species could coexist. This is supported by evidence that the two species coexist in sympatry, where preliminary data suggest reproductive character displacement may have reinforced postzygotic isolation.
Incomplete reproductive barriers and genomic differentiation impact the spread of resistance mutations between green- and red-colour morphs of a cosmopolitan mite pest
<p>We studied patterns of genetic differentiation and barriers to gene flow within and between morphs of <em>T. urticae</em> in order to understand the factors that influence the spread of resistance mutations across its populations. We derived multiple iso-female lines from <em>Tetranychus</em> populations collected from agricultural crops. We generated genomic and morphological data, characterized their bacterial communities, and performed controlled crosses.</p>
Prezygotic reproductive barriers in precopulatory behavior of tidepool copepod species
<p>Complexity in prezygotic mating behavior can contribute to the emergence of sexual incompatibility and reproductive isolation. In this study, we performed behavioral tests with two tidepool copepod species of the genus <em>Tigriopus</em> to explore the possibility of precopulatory behavioral isolation. We found that interspecific mating attempts failed prior to genital contact and that this failure occurred at different behavioral steps between reciprocal pairings. Our results suggest that prezygotic barriers may exist at multiple points of the behavioral process on both male and female sides, possibly due to interspecific differences in mate-recognition cues used at those "checkpoints". While many copepod species are known to show unique precopulatory mate-guarding behavior, the potential contribution of prezygotic behavioral factors to their isolation is not widely recognized. The pattern of sequential mate-guarding behaviors may have allowed diversification of precopulatory communication and contributed to the evolutionary diversity of the <em>Tigriopus</em> copepods.</p> <p>The .xlsx file registered here contains original datasets for Figures 4, 5, 6, and 7 and Table 1 in our manuscript.</p>
Data and analysis scripts for: Asymmetrical reproductive barriers in sympatric Jewelflowers: are floral isolation, genetic incompatibilities, and floral trait displacement connected?
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Strength in numbers? Cytotype frequency mediates effect of reproductive barriers in mixed-ploidy arrays.
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Incomplete reproductive barriers and genomic differentiation impact the spread of resistance mutations between green- and red-colour morphs of a cosmopolitan mite pest
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Data from: Reproductive interference and fecundity affect competitive interactions of sibling species with low mating barriers: experimental and theoretical evidence
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Data from: Female mate choice is a reproductive isolating barrier in Heliconius butterflies
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Data from: The effects of heterospecific mating frequency on the strength of cryptic reproductive barriers
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Migratory divides coincide with reproductive barriers across replicated avian hybrid zones above the Tibetan Plateau
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Prezygotic reproductive barriers in precopulatory behavior of tidepool copepod species
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.