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Close up of the small giant clam with visible mantle

Invertebrate Genomics, Molecular Laboratory Hamburg

Research interests

System: Coral reef ecosystems face growing threats from global climate change, with profound ecological and socio-economic consequences. While historically resilient, the current increasing intensity and frequency of environmental disturbances are overwhelming the adaptive capacities of many marine organisms. Understanding how species evolve with their environments and how human activities disrupt these relationships is essential for conservation. 

Goals: Investigate the evolutionary and molecular processes driving marine biodiversity. Develop an integrated understanding of these processes at both the genetic and phenotypic levels to predict adaptive capabilities and biotic responses to environmental change. Focus on how biodiversity arises, is maintained, and declines in marine invertebrates. Our work spans species, populations, and organisms, using fieldwork, experiments, and museum collections alongside advanced genomic analyses.

Main Research Themes

Species Evolution to Inform Species Management
A key question in systematics is whether widespread, morphologically uniform species reflect evolutionary stasis or hidden genetic diversity. Cryptic species, common in marine invertebrates, challenge conservation efforts. Using comparative phylogenomics coupled with morphological data, we aim to uncover diversification patterns, the emergence of new traits, and ecological specialization in marine bivalves.

Population Diversity to Predict Population Resilience
Population resilience to environmental changes relies on genetic diversity and connectivity. We investigate how natural and human disturbances, including habitat fragmentation, population displacement, and overfishing, affect the connectivity and diversity of commercially important bivalves populations, using modern molecular techniques.

Organismal Molecular Mechanisms of Resilience
A key goal in evolutionary biology is to understand how phenotypic plasticity and adaptation contribute to biodiversity. We focus on understanding the genetic mechanisms that drive acclimation to changing environments in bivalve and coral individual  organism by examining variations in gene expression and regulatory processes.

Our research group is dedicated to justice, equity, and inclusion, advocating for the fair treatment of all individuals, irrespective of race, ethnicity, gender, or sexual orientation. We actively promote anti-racist, anti-sexist, and anti-discriminatory practices in all aspects of our work. Sarah Lemer is committed to advancing the careers of women, people of color, and Indigenous peoples. We welcome students and postdocs who share these values and are passionate about invertebrate evolutionary genomics.

Related laboratory

Contact person

Dr. Sarah Lemer

  • Head of section
  • Scientific head of Molecular lab

Phone: +49 40 238317 631
E-Mail: s.lemer@leibniz-lib.de

Impressions

Red-albino pearl oyster Pinctada margaritifera (Gambier Island, French Polynesia)
Close-up of penshell Pinna bicolor gills (Cebu, Philippines)
Small giant clams, Tridacna maxima (Guam, Micronesia)
Sampling on a mono-specific reef landscape of Porites rus in Guam (Micronesia)
Branching coral, Acropora surculosa in Guam (Micronesia)
Branching coral Acropora pulchra bleaching from extreme low tide exposure in Guam (Micronesia)
Student sampling a giant colony of massive Porites in Maug (Micronesia)
Red-albino pearl oyster Pinctada margaritifera (Gambier Island, French Polynesia)
Close-up of penshell Pinna bicolor gills (Cebu, Philippines)
Small giant clams, Tridacna maxima (Guam, Micronesia)
Sampling on a mono-specific reef landscape of Porites rus in Guam (Micronesia)
Branching coral, Acropora surculosa in Guam (Micronesia)
Branching coral Acropora pulchra bleaching from extreme low tide exposure in Guam (Micronesia)
Student sampling a giant colony of massive Porites in Maug (Micronesia)

Projects

There are currently no projects available

Publications

| of

    2025

  • 2025/03

    Raeker, J., Lord, A., Herranz, M., Giribet, G., Worsaae, K., Schmidt-Rhaesa, A.

    Show more...

    The big, the small and the weird: A phylogenomic analysis of extant Priapulida

    Molecular Phylogenetics and Evolution, 204

  • 2025/02

    Pollard, K., Leiva, C., Rouzé, H., Lemer, S.

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    Genomic Insights From Natural History Collections Reveal Cryptic Speciation in Coral Guard Crabs (Family: Trapeziidae)

    Ecology and Evolution, 2, 15

  • 2025/01

    Li, R., Leiva, C., Lemer, S., Kirkendale, L., Li, J.

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    Photosymbiosis shaped animal genome architecture and gene evolution as revealed in giant clams

    Communications Biology, 1, 8

  • 2025/01

    Giles, E.C., González, V.L., Carimán, P., Leiva, C., Suescún, A.V., Lemer, S., Guillemin, M.L., Ortiz‐Barrientos, D., Saenz‐Agudelo, P.

    Show more...

    Comparative Genomics Points to Ecological Drivers of Genomic Divergence Among Intertidal Limpets

    Molecular Ecology resources

Employees

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