Affiliation:
1. Universidade Federal do Rio Grande – FURG, Brazil
2. Universidade Federal do Rio Grande do Sul
Abstract
Abstract
Genotype and phenotype in mobile organisms can be defined by various factors such as environmental, biological and geographical. Brown noddies Anous stolidus are pan-tropical seabirds breeding at different times, with migratory and resident populations in six islands throughout 20° of latitude in the Southwestern Atlantic Ocean. If environmental heterogeneity plays a key role in their population biology, we would expect significant genetic structure and/or phenotypic variation among colonies. However, absence of genetic structure between phenotypically different populations could play a scenario of ecological plasticity. To test these hypotheses, we used a model-based integrative approach combining genetic (mtDNA and ultraconserved elements) and morphological data of the brown noddy (n = 122) along with environmental variables and isotopic niches. We uncovered low levels of genetic structure, with 16 haplotypes for mtDNA and a signal of an ancient population expansion. Ultraconserved elements indicated that all colonies belong to the same genetic population (K = 1) and revealed substantial endogamy. However, phenotype differed both by biometric measures and isotopic niches between most pairs of populations. Although individuals from the northernmost colony are larger than the others, they are genetically similar, indicating a wide reaction norm for this species. Our results indicate the Southwestern Atlantic populations of the brown noddy are panmictic, but ecologically and morphologically diverse.
Publisher
Research Square Platform LLC
Reference104 articles.
1. Araujo MC, Cintra MM (2009) Modelagem matemática da circulação oceânica na região equatorial. In: Viana DL, Hazin FHV, de Souza MAC (eds) O arquipélago de São Pedro e São Paulo: 10 anos de estação científica. SECIRM, Brasilia, pp 7–113
2. Population genetic inference with Migrate;Beerli P;Curr Protoc Bioinformatics,2019
3. BirdLife International (2023) Species factsheet: Anous stolidus. Downloaded from http://www.birdlife.orgon07/03/2023
4. Trimmomatic: a flexible trimmer for Illumina Sequence Data;Bolger AM;Bioinformatics,2014
5. BEAST 2: a software platform for Bayesian evolutionary analysis;Bouckaert R;PLoS Comput Biol,2014