All the four perceiver obtained really specimens, specifically those out-of close by the fresh crossbreed region
Morphological evaluations
I scored mature specimen skins was able on the STRIBC (Letter =67), new American Art gallery from Sheer Records (AMNH, N =25), together with You Federal Art gallery bird range (USNM, Letter = 10) out of Costa Rica, Panama, and you can Colombia for each and every off three phenotypic characteristics: i) dorsal plumage, ii) ventral plumage, and iii) face shield ornamentation. After asiatisk brudebyrГҐ the , MJM, Sel-, or over to 3 most other perceiver (see Extra document step one: Desk S1) scored for every bird individually to the a measure of 0 – 1, in which 0 illustrated an excellent phenotypically absolute Jacana spinosa, and you may 1 portrayed a beneficial phenotypically sheer Jacana jacana (centered on evaluations that have skins away from outside the contact zone), and in addition we averaged the fresh score each feature since phenotypic hybrid index for every sample . Specimens with phenotypic crossbreed indicator lower than 0.ten were classified as the “pure” spinosa, if you’re an inventory off 0.90 or more is scored just like the “pure” jacana. A get anywhere between 0.10 and 0.twenty five is actually categorized as the “spinosa-like”, whereas an inventory anywhere between 0.75 and you can 0.90 is actually classified because “jacana-like”. Specimens which have indicator ranging from 0.twenty five and 0.75 have been categorized once the “hybrids”.
Genetic investigation
I sequenced an excellent 652 foot pair fragment of one’s mitochondrial cytochrome oxidase I gene (COI: the DNA barcode fragment) of 59 Panamanian jacanas, including a couple specimens off east Honduras provided for the data of the J. Klicka in addition to Marjorie Barrick Museum. I selected so it gene when planning on taking advantageous asset of existing series research to your Genbank getting jacanas out-of diverse geographic places, which were also put into the fresh new dataset (N = 10). Lab methods realize fundamental measures which were explained someplace else . I attempted however, were not able to create sequence analysis regarding bottom pad extractions regarding Smith and you will Emlen group of specimens.
The fresh COI investigation were utilized so you’re able to estimate the fresh new hereditary distinctiveness out-of the 2 jacana kinds and you can infer the amount of time of speciation ranging from J. spinosa and you may J. jacana, and also to assess the degree that geography limitations gene flow in jacanas (we.age. isolation-by-distance). We generated average-signing up for circle inside the PopART . We put Super in order to estimate an average length by using the HKY brand of molecular advancement to contrast divergence inside the jacanas for other avian types for which genetic point might have been calculated utilizing the HKY design .
I examined towards effect of geographic point into genetic differences (we.elizabeth., separation by point) via a good Mantel test accompanied in the program Alleles in proportions , and this measures up genetic and you may geographic distances one of anybody instead of populations. For both J. spinosa and you can J. jacana mtDNA sequence set, i correlated uncorrected pairwise series divergence that have pairwise geographical length for most of the you’ll be able to pairs. Dependence on brand new relationship are influenced by evaluating the observed relationship so you’re able to arbitrary correlations centered on 10,100 permutations.
So you’re able to fit this new mtDNA-established analyses regarding hereditary introgression across the jacana crossbreed zone, we sequenced one or two autosomal introns (gapdh eleven: , and you will 10551: ) to own STRIBC specimens obtained across the Panama. According to a short evaluation regarding succession version away from a number of products out of for each and every geographic endpoint (away from hybrid region) of your sampling framework, i known just one nucleotide polymorphism for every single intron: gapdh 3- anti-experience updates 136 (cytosine-thymine: C-T transition), and 10551 position 153 (adenine-guanine: A-Grams changeover). Positions is actually prior to aligned sequences of any intron with the J. spinosa attempt MJM8238 (Genbank accessions: gapdh: KM891734, 10551: KM891735).
Cline figure analyses
We estimated the shape of the phenotypic and genotypic clines using ClineFit , which applies the cline fitting formulas developed by Szymura and Barton . The shape of a cline is determined by three formulas. The first formula (1) defines a symmetric S-shaped curve around the center of the hybrid zone, and relies on two parameters: c – for the center of the curve, and w – which is 1/maximum slope of the cline, and represents the cline width. Two additional formulae define the cline tails (2,3) and add four additional parameters: z L and z R , which represent the distance from c to a vertical asymptote for the exponential decay of allele frequencies to the left and right sides of the hybrid zone, while ? L and ? R define the rates of this exponential decay relative to the shape of the central cline (1).
