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| Author(s): |
Dione Oliveira Jordan
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2023-04-10 |
| Examining board members: |
Sonia Cristina da Silva Andrade;
Federico David Brown Almeida;
Gisele Yukimi Kawauchi
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| Advisor: | Sonia Cristina da Silva Andrade |
| Abstract | |
The nemertean species Lineus sanguineus (Rathke,1799) and Prosorhochmus belizeanus (Maslakova et al, 2008) live in intertidal environment of rocky shores and have distinct distribution on Brazilian coastline. In this study, we survey the phylogeography of the two species along the Brazilian coast. For L. sanguineus we used the molecular markers of cytochrome c oxidase subunit 1 (COI), 16S ribosomal RNA (16SrRNA) and Internal transcribed spacer 1 (ITS-1) of individuals from nine localities. No clear geographic patterns was found in the haplotype network and phylogenetic tree, also ITS-1 showed more intrapopulation diversity than mtDNA. AMOVA evidenced moderate genetic structuring, with most of genetic variation within localities. Pairwise FST shows some high genetic structuring between Northeast and some localities from South and Southeast, a pattern that suggests that Brazilian oceanic currents play an important role on the species connectivity. These results indicate that sexual reproduction and larval dispersion play a key role in the connectivity of these populations along with environmental and oceanographic variables. Also, we presented the first record of P. belizeanus in Brazil along with its genetic diversity analysis for this region. Using COI and 16SrRNA, we found no genetic structuring among localities, no clear geographical pattern and no sign of demographic retraction or expansion, suggesting colonization by a small number of mtDNA lineages followed by population stability. In addition, migration analysis evidenced some influence of Brazilian Current in dispersion. Together, those results increase the knowledge and helps to understand the phylogeography and genetic diversity of brazilian marine invertebrates from rocky shores. (AU) | |
| FAPESP's process: | 20/01407-0 - Analysis of Nemertea diversity on the Southeast Brazilian coast |
| Grantee: | Dione Oliveira Jordan |
| Support Opportunities: | Scholarships in Brazil - Master |