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768 results for “sympatric species”
FIGURE 37–41 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURE 37–41. Paratropis pristirana sp. n. 37. Palp, prolateral view (holotype). 38. Palp, retrolateral view (holotype). 39. Bulb, prolateral view (paratype). 40. Bulb, ventral view (paratype). 41. Bulb, retrolateral view (paratype). Scale bars: 0.5mm.
FIGURES 31–36 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 31–36. Paratropis pristirana sp. n. 31. Male sternum and chelicerae, ventral view. 32. Abdomen, ventral view. 33. Tarsus I, lateral view. 34. Tarsus II, lateral view. 35. Male palpal tibia and tarsus, dorsal view. 36. Female, palpal tibia and tarsus, dorsal view. Scale bars: 0.5mm.
FIGURES 17–26 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 17–26. Paratropis otonga sp. n. 17–20. Tibiae I-IV dorsal view. 21–24. Metatarsi and tarsi I-IV, dorsal view. 25. Palpal tibia and tarsus, dorsal view. 26. Tarsus I, lateral view (arrow points to spine). Scale bars: 0.5mm.
FIGURES 29, 30 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 29, 30. Paratropis pristirana sp. n. 29. Holotype male habitus (in ethanol), dorsal view. 30. Allotype female habitus (in ethanol), dorsal view. Scale bars: 1.0mm.
FIGURES 10–12. 10 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 10–12. 10. Paratropis elicioi Dupérré 2015, female internal genitalia, dorsal view. 11. Paratropis otonga sp. n., female (holotype) internal genitalia, dorsal view. 12. Paratropis pristirana sp. n., female (holotype) internal genitalia, dorsal view.
FIGURE 5–9 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURE 5–9. Paratropis elicioi Dupérré 2015. 5. Palp, prolateral view (holotype). 6. Palp, retrolateral view (holotype). 7. Bulb, prolateral view. 8. Bulb, ventral view. 9. Bulb, retrolateral view. Scale bars: 0.5mm.
FIGURES 1, 2 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 1, 2. Paratropis elicioi Dupérré 2015. 1. Male habitus, semi-lateral view. 2. Female habitus, semi-lateral view. Scale bar: 1.0mm.
FIGURES 14–16 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 14–16. Paratropis otonga sp. n. (holotype). 14. Habitus (in ethanol), dorsal view. 15. Sternum and chelicerae, ventral view. 16. Abdomen, ventral view. Scale bars: 14: 5mm; 15, 16: 1mm.
FIGURES 3, 4 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 3, 4. Paratropis elicioi Dupérré 2015. 3. Holotype male, dorsal view. 4. Paratype female, habitus, dorsal view. Scale bars: 1.0mm.
FIGURE 42–49 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURE 42–49. Paratropis pristirana sp. n. (paratype). 42–45. Tibiae I-IV dorsal view. 45–49. Metatarsi and tarsi I-IV, dorsal view. Scale bars: 0.5mm.
FIGURES 27, 28 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 27, 28. Paratropis pristirana sp. n. 27. Male habitus (alive), lateral view. 28. Female habitus (alive), lateral view. Scale bar: 1.0mm.
FIGURES 58–63. 58, 60, 62 in On the putatively incorrect identification and "redescription" of Paratropis elicioi Dupérré 2015 (Paratropididae, Araneae) with the description of two new sympatric species from Ecuador
FIGURES 58–63. 58, 60, 62. Paratropis elicioi Dupérré 2015. 58. Palp, retrolateral view. 60. Sternum and labium, ventral view. 62. Epigastric region, ventral view (arrow points to epiandrous spigot). 59, 61, 63. Paratropis pristirana sp. n. 59. Palp, retrolateral view. 61. Sternum and labium, ventral view. 63. Epigastric region, ventral view.
Data from: Hybridization, natural selection and evolution of reproductive isolation: a 25-years survey of an artificial sympatric area between two mosquito sibling species of the Aedes mariae complex
Natural selection can act against maladaptive hybridization between co-occurring divergent populations leading to evolution of reproductive isolation among them. A critical unanswered question about this process that provides a basis for the theory of speciation by reinforcement, is whether natural selection can cause hybridization rates to evolve to zero. Here we investigated this issue in two sibling mosquitoes species, Aedes mariae and Ae. zammitii, that show post-mating reproductive isolation (F1 males sterile) and partial pre-mating isolation (different height of mating swarms) that could be reinforced by natural selection against hybridization. In 1986, we created an artificial sympatric area between the two species and sampled about 20,000 individuals over the following 25 years. Between 1986 to 2011, the composition of mating swarms and the hybridization rate between the two species were investigated across time in the sympatric area. Our results showed that Ae. mariae and Ae. zammitii have not completed reproductive isolation since their first contact in the artificial sympatric area. We have discussed the relative role of factors such as time of contact, gene flow, strength of natural selection, and biological mechanisms causing prezygotic isolation to explain the observed results.
Data from: Cryptic diversity in a fig wasp community – morphologically differentiated species are sympatric but cryptic species are allopatric
A key debate in ecology centres on the relative importance of niche and neutral processes in determining patterns of community assembly with particular focus on whether ecologically similar species with similar functional traits are able to coexist. Meanwhile, molecular studies are increasingly revealing morphologically indistinguishable cryptic species with presumably similar ecological roles. Determining the geographic distribution of such cryptic species provides opportunities to contrast predictions of niche versus neutral models. Discovery of sympatric cryptic species increases alpha diversity and supports neutral models, while documentation of allopatric/parapatric cryptic species increases beta diversity and supports niche models. We tested these predictions using morphological and molecular data, coupled with environmental niche modelling analyses, of a fig wasp community along its 2700 km latitudinal range. Molecular methods increased previous species diversity estimates from eight to eleven species, revealing morphologically cryptic species in each of the four wasp genera studied. Congeneric species pairs that were differentiated by a key morphological functional trait (ovipositor length) coexisted sympatrically over large areas. In contrast, morphologically similar species, with similar ovipositor lengths, typically showed parapatric ranges with very little overlap. Despite parapatric ranges, environmental niche models of cryptic congeneric pairs indicate large regions of potential sympatry, suggesting that competitive processes are important in determining the distributions of ecologically similar species. Niche processes appear to structure this insect community and cryptic diversity may typically contribute mostly to beta rather than alpha diversity.
Data from: Are sympatrically speciating Midas cichlid fish special? Patterns of morphological and genetic variation in the closely related species Archocentrus centrarchus
Established empirical cases of sympatric speciation are scarce, although there is an increasing consensus that sympatric speciation might be more common than previously thought. Midas cichlid fish are one of the few substantiated cases of sympatric speciation, and they formed repeated radiations in crater lakes. In contrast, in the same environment, such radiation patterns have not been observed in other species of cichlids and other families of fish. We analyze morphological and genetic variation in a cichlid species (Archocentrus centrarchus) that co-inhabits several crater lakes with the Midas species complex. In particular, we analyze variation in body and pharyngeal jaw shape (two ecologically important traits in sympatrically divergent Midas cichlids) and relate that to genetic variation in mitochondrial control region and microsatellites. Using these four datasets, we analyze variation between and within two Nicaraguan lakes: a crater lake where multiple Midas cichlids have been described and a lake where the source population lives. We do not observe any within-lake clustering consistent across morphological traits and genetic markers, suggesting the absence of sympatric divergence in A. centrarchus. Genetic differentiation between lakes was low and morphological divergence absent. Such morphological similarity between lakes is found not only in average morphology, but also when analyzing covariation between traits and degree of morphospace occupation. A combined analysis of the mitochondrial control region in A. centrarchus and Midas cichlids suggests that a difference between lineages in the timing of crater lake colonization cannot be invoked as an explanation for the difference in their levels of diversification. In light of our results, A. centrarchus represents the ideal candidate to study the genomic differences between these two lineages that might explain why some lineages are more likely to speciate and diverge in sympatry than others.
Data from: Towards a functional understanding of species coexistence: ecomorphological variation in relation to whole-organism performance in two sympatric lizards
1. We examined intra- and interspecific variation in functional morphology and whole-organism performance in a sympatric lizard species pair, Iberolacerta horvathi and Podarcis muralis, in the area with a high potential for competition. 2. The biggest variation between species was found in two functional traits, bite force and climbing speed, linked with corresponding morphological traits. 3. The species with larger and taller heads, P. muralis, exhibited correspondingly stronger bite forces. The other species exhibited smaller and flatter head. Both traits may potentially promote segregation between species in trophic niche (stronger bites relate to harder prey) and in refuge use (flatter heads allow using narrower crevices, hence, influencing escaping from common predators). Stronger bites and larger heads also provide one species with a dominant position in interspecific agonistic interactions. 4. Females had longer trunks that impacted negatively on climbing speed, which may lower anti-predator escape abilities of the more trunk-dimorphic species, but positively influence reproductive effort. 5. Our results exemplify how the joint examination of morphological and functional traits of ecologically similar and sympatric species can provide a mechanistic background for understanding their coexistence, namely syntopic populations that are frequent in the study area. 6. The identified roles of functional morphology in this system of sympatric rock lizards support the contribution of functional diversification for the complexity of community structure via coexistence.
Data from: Evaluating patterns of convergent evolution and trans-species polymorphism at MHC immunogenes in two sympatric stickleback species
The immunologically important major histocompatibility complex (MHC) harbors some of the most polymorphic genes in vertebrates. These genes presumably evolve under parasite-mediated selection and frequently show inconsistent allelic genealogies, where some alleles are more similar between species than within species. This phenomenon is thought to arise either from convergent evolution under parallel selection or from the preservation of ancient allelic lineages beyond speciation events (trans-species polymorphism, TSP). Here we examine natural populations of two sympatric stickleback species (Gasterosteus aculeatus and Pungitius pungitius) to investigate the contribution of these two mechanisms to the evolution of inconsistent allelic genealogies at the MHC. Overlapping parasite taxa between the two host species in three different habitats suggest contemporary parallel selection on the MHC genes. Accordingly, we detected a lack of species-specific phylogenetic clustering in the immunologically relevant antigen-binding residues of the MHC IIB genes which contrasted with the rest of the coding and non-coding sequence. However, clustering was not habitat-specific and a codon-usage analysis revealed patterns of similarity by descent. In this light, common descent via TSP, in combination with intra-species gene conversion, rather than convergent evolution is the more strongly supported scenario for the inconsistent genealogy at the MHC.
Data from: Long-term panmixia in a cosmopolitan Indo-Pacific coral reef fish and a nebulous genetic boundary with its broadly sympatric sister species
Phylogeographical studies have shown that some shallow-water marine organisms, such as certain coral reef fishes, lack spatial population structure at oceanic scales, despite vast distances of pelagic habitat between reefs and other dispersal barriers. However, whether these dispersive widespread taxa constitute long-term panmictic populations across their species ranges remains unknown. Conventional phylogeographical inferences frequently fail to distinguish between long-term panmixia and metapopulations connected by gene flow. Moreover, marine organisms have notoriously large effective population sizes that confound population structure detection. Therefore, at what spatial scale marine populations experience independent evolutionary trajectories and ultimately species divergence is still unclear. Here, we present a phylogeographical study of a cosmopolitan Indo-Pacific coral reef fish Naso hexacanthus and its sister species Naso caesius, using two mtDNA and two nDNA markers. The purpose of this study was two-fold: first, to test for broad-scale panmixia in N. hexacanthus by fitting the data to various phylogeographical models within a Bayesian statistical framework, and second, to explore patterns of genetic divergence between the two broadly sympatric species. We report that N. hexacanthus shows little population structure across the Indo-Pacific and a range-wide, long-term panmictic population model best fit the data. Hence, this species presently comprises a single evolutionary unit across much of the tropical Indian and Pacific Oceans. Naso hexacanthus and N. caesius were not reciprocally monophyletic in the mtDNA markers but showed varying degrees of population level divergence in the two nuclear introns. Overall, patterns are consistent with secondary introgression following a period of isolation, which may be attributed to oceanographic conditions of the mid to late Pleistocene, when these two species appear to have diverged.
Data from: Asymmetric introgression between Magnolia stellata and M. salicifolia at a site where the two species grow sympatrically
In order to understand the ongoing evolutionary relationships between species, it is important to elucidate patterns of natural hybridization. In the zone where two species are sympatrically distributed, we examined 274 individuals of Magnolia stellata, Magnolia salicifolia, and their putative hybrids by means of 16 nuclear and three chloroplast microsatellite markers. Hybrid classes of individuals were estimated by admixture analyses. Morphological traits were also investigated for 64 of the 274 individuals. Admixture analyses revealed that 66 of the 274 individuals were classified as hybrids, comprising 17 F1 and 19 F2 individuals, 27 backcrosses to M. salicifolia, and 3 individuals of unknown origin. Morphological data from the 64 individuals agreed well with their genetic admixture rates. Spatial locations of F1 and F2 hybrids at the study site were intermediate between the two purebred species, indicating that the site preferences of hybrids are intermediate. The occurrences of F2 and backcross hybrids indicate that F1 hybrids are fertile. The chloroplast DNA haplotypes of all F1 hybrids corresponded to those detected in M. salicifolia, so that maternal parents of the F1 hybrids were all M. salicifolia. Furthermore, no hybrid individuals derived from a backcross to M. stellata were detected. These results suggest that the direction of hybridization and the subsequent introgression have been quite asymmetric and that the introgression occurred from M. stellata into M. salicifolia.
Data from: Spatio-temporal responses of predators to hyperabundant geese affect risk of predation for sympatric-nesting species
The Arctic is undergoing rapid changes, with anthropogenic shifts in climate having important and well-documented impacts on habitat. Populations of predators and their prey are affected by changing climate and other anthropogenic factors, and these changing trophic interactions could have profound effects on breeding populations of Arctic birds. Variable abundance of lemmings (a primary prey of generalist Arctic predators) and increasing abundance of light geese (Lesser Snow and Ross' Geese; a secondary prey) could have negative consequences for numerous sympatric shorebirds (an incidental prey). Using 16 years of predator-prey observations and 13-years of shorebird nest survival data at a site near a goose colony we identify relationships among geese, lemmings, and their shared predators and then relate predator indices to shorebird risk of nest predation. During two years, we also placed time-lapse cameras and artificial shorebird nests at increasing distances from a goose colony to document spatial trends in predators and their effect on risk of predation. In the long-term data, yearly indices of light geese positively influenced indices of gulls and jaegers, and shorebird nest predation rate was negatively correlated with jaeger and fox indices. All three predator indices were highest near the goose colony and artificial nest predation probability was negatively correlated with distance from goose colony, but these effects were less apparent during the second year. Combined, these results highlight the variation in predator-mediated interactions between geese and shorebirds and outline one mechanism by which hyperabundant geese may be contributing to local or regional declines in Arctic-nesting shorebird populations.
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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.