About

je

I am a postdoctoral researcher fellow in the department of Ecology and Evolutionary Biology
at the University of Michigan, at Lacey Knowles’ lab. I am interested in the species
delimitation process, linking micro and macro evolution. I am currently living in Australia,
where I just submitted my Ph.D. for evaluation at the Australian National University, at Craig Moritz’s lab.
My dissertation concerns macroecological questions and landscape genomics related to
lizards in savannas environments, mostly in Australia and Brazil. I did my Master’s through
University of Brasilia, Brazil, working with phylogenetic diversity and habitat loss in Neotropical
pitvipers. I also assisted in the preparation of the redlist of lizards and amphisbaenians of Brazil.

Any questions? Do you want to chat? Feel free to contact me by email                                 
(jessica.fenker@anu.edu.au) and follow my updates on twitter (@jehzim).

 

Current Research

Diversification of Lizards in savanna environements

Ecomorphological diversification

Tropical savannas are intermediate systems between dry xerophytic areas and moist deciduous forests. Their exhibit a wide variety of local environments, which allows a high number of species to coexist, with high levels of endemism. Both South America and Australia tropical savannas have highly diverse herpetofaunas. Similar biogeographic events profoundly marked both continents-from a common Gondwanan origin, followed by a long period of isolation and recent colonization and diversity of lineages from the north. In face of the analogous histories of environments, what can we infer from the comparative biogeography, morphology and diversity of these two squamates faunas? How the morphospace volume differ between Cerrado and AMT squamate communities? How is the relationship between morphospace volume and evolutionary history and how does it differ between those regions? How similar these communities are compared to null expectations? And finally, can we observed convergence on squamate assemblages on Cerrado and AMT?

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Evolutionary Conservation of the Cerrado

The Cerrado is a biodiversity hotspot and the most biodiverse tropical savanna in the world. Brazilian conservation policies often neglect non-forest ecosystems, and determining where the diversity of Cerrado taxa is concentrated is important for prioritizing conservation efforts. Combining diversity and endemism measures with an integrative approach using taxonomic, phylogenetic and functional data we aimed to highlight key areas for the past and future maintenance of biodiversity in the Cerrado. We use refined phylogeographic and population-level lizards datasets to improve phylogenetic diversity estimates and an independent of named taxa approach to support conservation planning for biota in an areas where the taxonomy is incomplete. This work is published at Journal of Biogeography, and presented at the Journal of Biogeography ECR feature blog.

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Phylogeography and incipient speciation in Diporiphora agamids

The Australian Monsoonal Tropics (AMT) is a vast tropical savanna with high levels of richness and endemism, associated with its environmental heterogeneity. Despite our growing knowledge surrounding species diversity, species have different ecological requirements and can respond differently to the same geographic events. The two-lined dragons (genus Diporiphora) are a diverse group of small diurnal lizards, relatively common in Australia. Taxonomic problems related to conservative morphological characteristics, have long been recognized for the genus. Using a broad geographic and genomic sampling of mtDNA and SNP variation in Diporiphora dragons from across the AMT, we aimed to evaluate the impact of biogeographic breaks and climatic fluctuations on phylogeographic structuring and demographic history of species with diverse ecological requirements.

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Predictors of Phylogeographic Structure and Landscape Genetics

Species dispersal rates vary depend on intrinsic movement rates and species habitat preference and are predicted to influence rates of speciation and extinction and hence spatial patterns of diversity. With a combination of population genetic summary statistics and landscape genomic analyses, based on mtDNA and extensive SNP datasets from geckos, dragons and scincid lizards across the diverse and heterogeneous savanna-like Australian Monsoonal Tropics, we aim to explore how the environment and landscape features affect the gene flow of species across genera and with different habitat specialization across the same geographical region. We asked 1) does habitat use predict how landscape features influence the degree of gene flow across a common environmental? and 2) how migration and population expansion affect species with different habitat use? Then, we explored predictors of the scale and depth of phylogeographic structure, testing whether microevolutionary processes explain differences in the geographic scale and depth of phylogeographic lineages.

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