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206 results for “cline”
FIGURE 11 in A new species of southern African pollen beetle and discussion of the taxonomic position of Jelinekigethes Audisio & Cline, 2009 (Coleoptera: Nitidulidae: Meligethinae)
FIGURE 11. Map of known geographic distribution of Jelinekigethes danielssoni (Audisio 1995) (black triangles) and of J. dichromus sp. nov. (white triangle) in South Africa.
FIGURES 1–10. 1–2 in A new species of southern African pollen beetle and discussion of the taxonomic position of Jelinekigethes Audisio & Cline, 2009 (Coleoptera: Nitidulidae: Meligethinae)
FIGURES 1–10. 1–2: habitus; 1, Jelinekigethes danielssoni (Audisio 1995) (male paratype from South Africa, Western Cape, De Hoop Nature Reserve); 2, Jelinekigethes dichromus sp. nov. (male paratype from South Africa, Limpopo, Wolkberg Nature Reserve). 3–6: male genitalia (tegmen and median lobe of aedeagus); 3–4, Jelinekigethes danielssoni (Audisio 1995) (male paratype from South Africa, Western Cape, De Hoop Nature Reserve); 5–6: Jelinekigethes dichromus sp. nov. (male paratype from South Africa, Limpopo, Wolkberg Nature Reserve). 7–8: ovipositors and magnification of the left stylus; 7, Jelinekigethes dichromus sp. nov. (female paratype from South Africa, Limpopo, Wolkberg Nature Reserve); 8, Jelinekigethes danielssoni (Audisio, 1995) (female paratype from South Africa, Western Cape, Franschhoek Pass). 9: right anterior tibia of Jelinekigethes danielssoni (Audisio 1995) (male paratype from South Africa, Western Cape, De Hoop Nature Reserve). 10: pygidium of Jelinekigethes danielssoni (Audisio 1995) (female from South Africa, Western Cape, Dutoits Kloof Nature Reserve). Scale bar = 1.0 mm (Figs 1–2); = 0.17 mm (Figs 3–9); = 0.50 mm (Fig. 10).
Supplementary material 1 from: Tanaka S (2024) Geographic variation in body size of the migratory locust Locusta migratoria (Orthoptera, Acrididae): Masaki's cline and phase polyphenism. Journal of Orthoptera Research 33(1): 27-40. https://doi.org/10.3897/jor.33.107242
Supplementary material 1 from: Tanaka S (2024) Geographic variation in body size of the migratory locust Locusta migratoria (Orthoptera, Acrididae): Masaki's cline and phase polyphenism. Journal of Orthoptera Research 33(1): 27-40. https://doi.org/10.3897/jor.33.107242
Data and Code for: Oh, the places you will grow: intraspecific latitudinal clines in butterfly size suggest a phylogenetic signal
<p>This publication contains the R-Scripts and other supplementary files necessary to reproduce the analyses and figures of Merwin A, Hilliard J, Larsen<span> </span>A, Lasken A, Johnson I (2022) Oh, the places you will grow: intraspecific latitudinal clines in butterfly size suggest a phylogenetic signal. Ecology and Evolution</p> <p>All files are compressed into a single ZIP folder. All directories contain README files that explain their contents.</p>
Data from: Rapid evolution of latitudinal clines in growth and defense of an invasive weed
<p>Re-estabishment of heritable latitudinal clines in growth-related traits has been recognized as evidence for adaptive evolution in invasive plants. However, less is known about latitudinal clines in defense and joint clinal evolution of growth and defense in invasive plants.</p> <p>We planted 14 native Argentinean populations and 14 introduced Chinese populations of <i>Aternanthera philoxeroides</i> in repicate common gardens in China. We investigated the latitudinal clines of traits related to growth and defense, and plasticity of these traits in relation to experiment site and soil nitrogen.</p> <p>We found that chemical defense decreased with latitude in native populations but increased with latitude in introduced populations. For growth rate, latitudinal clines were positive in introduced populations but nonexistent in native populations. There were also parallel positive latitudinal clines in total/shoot biomass and specific leaf area. Experiment site affected the occurrence or magnitude of latitudinal clines in growth rate, branch intensity and triterpenoid saponins concentration. Introduced populations were more plastic to experiment site and soil nitrogen than native populations.</p> <p>We provide evidence for rapid evolution of clines in growth and defense in an invasive plant. Altered herbivory gradients and trade-off between growth and defense may explain non-parallel clines between the native and introduced ranges</p>
Clines on the seashore: The genomic architecture underlying rapid divergence in the face of gene flow
<p>Adaptive divergence and speciation may happen despite opposition by gene flow. Identifying the genomic basis underlying divergence with gene flow is a major task in evolutionary genomics. Most approaches (e.g., outlier scans) focus on genomic regions of high differentiation. However, not all genomic architectures potentially underlying divergence are expected to show extreme differentiation. Here, we develop an approach that combines hybrid zone analysis (i.e., focuses on spatial patterns of allele frequency change) with system-specific simulations to identify loci inconsistent with neutral evolution. We apply this to a genome-wide SNP set from an ideally suited study organism, the intertidal snail <em>Littorina saxatilis</em>, which shows primary divergence between ecotypes associated with different shore habitats. We detect many SNPs with clinal patterns, most of which are consistent with neutrality. Among non-neutral SNPs, most are located within three large putative inversions differentiating ecotypes. Many non-neutral SNPs show relatively low levels of differentiation. We discuss potential reasons for this pattern, including loose linkage to selected variants, polygenic adaptation and a component of balancing selection within populations (which may be expected for inversions). Our work is in line with theory predicting a role for inversions in divergence, and emphasizes that genomic regions contributing to divergence may not always be accessible with methods purely based on allele frequency differences. These conclusions call for approaches that take spatial patterns of allele frequency change into account in other systems.</p>
Supplementary material 4 from: Romiti F, Redolfi De Zan L, Rossi de Gasperis S, Tini M, Scaccini D, Anaclerio M, Carpaneto G (2017) Latitudinal cline in weapon allometry and phenology of the European stag beetle. In: Campanaro A, Hardersen S, Sabbatini Peverieri G, Carpaneto GM (Eds) Monitoring of saproxylic beetles and other insects protected in the European Union. Nature Conservation 19: 57-80. https://doi.org/10.3897/natureconservation.19.12681
Allometric relationship between mandible (LnML) and elytron (LnEL) length of each population : Data type: statistical data
Supplementary material 3 from: Romiti F, Redolfi De Zan L, Rossi de Gasperis S, Tini M, Scaccini D, Anaclerio M, Carpaneto G (2017) Latitudinal cline in weapon allometry and phenology of the European stag beetle. In: Campanaro A, Hardersen S, Sabbatini Peverieri G, Carpaneto GM (Eds) Monitoring of saproxylic beetles and other insects protected in the European Union. Nature Conservation 19: 57-80. https://doi.org/10.3897/natureconservation.19.12681
Allometric relationship between mandible (LnML) and elytron (LnEL) length for minor and major morph : Data type: statistical data
Supplementary material 1 from: Romiti F, Redolfi De Zan L, Rossi de Gasperis S, Tini M, Scaccini D, Anaclerio M, Carpaneto G (2017) Latitudinal cline in weapon allometry and phenology of the European stag beetle. In: Campanaro A, Hardersen S, Sabbatini Peverieri G, Carpaneto GM (Eds) Monitoring of saproxylic beetles and other insects protected in the European Union. Nature Conservation 19: 57-80. https://doi.org/10.3897/natureconservation.19.12681
Shapiro-Wilk normality test on biometric, phenological and climatic variable : Data type: statistical data
Fig. 11 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 11 Evolutionary history of Rhodanthidium caturigense from various parts of the distribution area as inferred by using the maximum likelihood method and Kimura 2-parameter model. Numbers shown
Fig. 9 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 9 Relationship between the scutum width of Rhodanthidium caturigense and the geographic latitude. The scutum width highly correlates with other morphometric parameters and is a good indicator of body size
Fig. 10 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 10 Mean scutum width in the seven operational units (OUs) of Rhodanthidium caturigense. While scutum width is similar in the southern populations, there is significant sexual dimorphism some northern populations
Fig. 6 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 6 Shape and coloration of the clypeus A, B in the male and coloration of abdominal terga C, D in the female of Rhodanthidium caturigense. In southern populations, the male clypeus is yellow or almost yellow, with a straight or only shallowly emarginate apical margin A. In northern populations, particularly in the Alps, the male
Fig. 5 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 5 Male of Rhodanthidium caturigense (s.l.) from various regions. The coloration changes from bright yellow in the south to dull yellow in the north, and the melanic coloration increases towards
Fig. 3 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 3 Templates used for describing the extent of yellow colour on clypeus, scutum, scutellum, axilla and pronotal lobe in Rhodanthidium caturigense. The numbers below the figures give the numerical values used for assessing the overall colour scores
Fig. 4 in So different but nonetheless the same species: multiple geographic clines explain the diverse forms of the anthidiine bee Rhodanthidium caturigense s.l. (Apoidea: Megachilidae: Anthidiini)
Fig. 4 Template used for describing the pattern of yellow colour on gena and vertex in Rhodanthidium caturigense. The numerical values are given below the drawings
Data sets and code for Sullivan and Koski "The role of photosynthetic response to environmental variation in shaping an elevational cline in leaf variegation"
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Data from: Grow with the flow: a latitudinal cline in physiology is associated with more variable precipitation in Erythranthe cardinalis
Local adaptation is commonly observed in nature: organisms perform well in their natal environment, but poorly outside it. Correlations between traits and latitude, or latitudinal clines, are among the most common pieces of evidence for local adaptation, but identifying the traits under selection and the selective agents is challenging. Here, we investigated a latitudinal cline in growth and photosynthesis across 16 populations of the perennial herb Erythranthe cardinalis (Phrymaceae). Using machine learning methods, we identify interannual variation in precipitation as a likely selective agent: southern populations from more variable environments had higher photosynthetic rates and grew faster. We hypothesize that selection may favour a more annualized life history – grow now rather than save for next year – in environments where severe droughts occur more often. Thus, our study provides insight into how species may adapt if Mediterranean climates become more variable due to climate change.
Data from: A geographic cline in the ability to self-fertilize is unrelated to the pollination environment
<p>The reproductive assurance (RA) hypothesis predicts that the ability to autonomously self-fertilize should be favored in environments where a lack of mates or pollinators limits outcross reproduction. Because such limits to outcrossing are predicted to be most severe at range edges, elevated autonomy in peripheral populations is often attributed to RA. We test this hypothesis in 24 populations spanning the range of Campanula americana, including sampling at the range interior and three geographic range edges. We scored autonomous fruit set in a pollinator-free environment and detected clinal variation—autonomy increased linearly from the southern to the northern edge, and from the eastern to the western edge. We then address whether the cline reflects the contemporary pollination environment. We measured population size, plant density, pollinator visitation, outcross pollen limitation and RA in natural populations over two years. Most populations were pollen limited, and those that experienced higher visitation rates by bumblebees had reduced pollen limitation. Reproductive assurance, however, was generally low across populations and was unrelated to pollen limitation or autonomy. Neither pollen limitation nor RA displayed geographic clines. Finally, autonomy was not associated with pollinator visitation rates or mate availability. Thus, the data do not support the RA hypothesis; clinal variation in autonomy is unrelated to the current pollination environment. Therefore, geographic patterns of autonomy are likely the result of historical processes rather than contemporary natural selection for RA.</p>
Genomic shifts, phenotypic clines and fitness costs associated with cold-tolerance in the Asian tiger mosquito
<p>Climatic variation is a key driver of genetic differentiation and phenotypic traits evolution, and local adaptation to temperature is expected in widespread species. We investigated phenotypic and genomic changes in the native range of the Asian tiger mosquito, <em>Aedes</em> <em>albopictus</em>. We first refine the phylogeographic structure based on genome-wide regions (1,901 double-digest restriction-site associated DNA single nucleotide polymophisms [ddRAD SNPs]) from 41 populations. We then explore the patterns of cold adaptation using phenotypic traits measured in common garden (wing size and cold tolerance) and genotype–temperature associations at targeted candidate regions (51,706 exon-capture SNPs) from nine populations. We confirm the existence of three evolutionary lineages including clades A (Malaysia, Thailand, Cambodia, and Laos), B (China and Okinawa), and C (South Korea and Japan). We identified temperature-associated differentiation in 15 out of 221 candidate regions but none in ddRAD regions, supporting the role of directional selection in detected genes. These include genes involved in lipid metabolism and a circadian clock gene. Most outlier SNPs are differently fixed between clades A and C, whereas clade B has an intermediate pattern. Females are larger at higher latitudes yet produce no more eggs, which might favor the storage of energetic reserves in colder climates. Nondiapausing eggs from temperate populations survive better to cold exposure than those from tropical populations, suggesting they are protected from freezing damages but this cold tolerance has a fitness cost in terms of egg viability. Altogether, our results provide strong evidence for the thermal adaptation of <em>A</em>. <em>albopictus</em> across its wide temperature range.</p>
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