Welcome to the Martin fish speciation lab! We are evolutionary biologists broadly interested in the ecology and evolution of adaptive radiation. We use large-scale field experiments, population genomics, ecological variation, behavioral ecology, functional morphology, and phylogenetic comparative methods to dissect this process at various stages.
We are primarily developing two tropical field systems for studying the origins of adaptive radiation: 1) Caribbean microendemic radiations of trophic specialist pupfishes and 2) Cameroon crater lake cichlids, famous as putative examples of sympatric speciation.
Common themes in our work include 1) the genetic, behavioral, and ecological origins of adaptive radiation in space and time, 2) estimating the complex form of the fitness landscape driving this process, and 3) the evolution of novel phenotypes.
If you are intrigued by the speciation process, drawn to tropical field systems, and you have a particular thing about fish, I strongly encourage you to contact me!
I am currently accepting graduate students through Integrative Biology at the University of California, Berkeley. The graduate program is described here (annual admissions deadline is December 3rd). For those considering a PhD, I would suggest reading the excellent perspectives here and here.
As the Curator of Ichthyology for Cal, our lab is based inside the Museum of Vertebrate Zoology with extensive shared spaces for molecular genetics work, student offices, specimen preparation, data entry, and separate rooms for the live fish colonies and fish collection.
I am also currently seeking postdocs with a passion for fishes and integrative biology, specifically in the fields of genomics, functional genetics, or developmental biology. If you are interested in applying for a postdoc position in the lab please contact me.
I study three rapidly diversifying species of Cyprinodon pupfishes endemic to San Salvador Island to understand the genetic basis of novel traits. I also have a mammalian study system at home. My two cats, Theo and Zhansky, named after my favorite mid-20th century Russian evolutionary empiricist -- Theodosius Dobzhansky. website Contact me
McGirr JA, Martin CH. 2018. Parallel evolution of gene expression between trophic specialists despite divergent genotypes and morphologies. Evo Letters pdf
McGirr JA, Martin CH. 2019. Hybrid gene misregulation in multiple developing tissues within a recent adaptive radiation of Cyprinodon pupfishes. PLOS One pdf
McGirr JA, Martin CH. 2019. Ecological divergence in sympatry causes gene misregulation in hybrids. preprint
I am broadly interested in how adaptation and speciation processes interact on a genomic level during adaptive radiations and how we harness the powerful resource of genomic data to address questions about evolutionary history. I am currently working on identifying the sources of genetic variation that fueled adaptive diversification in a radiation of trophic specialist pupfishes on a single island in the Bahamas. When I am not busy typing away at my computer, my hobbies include recreational scuba diving and watching nature documentaries with my cat. website Contact me
Richards EJ, Martin CH. 2017. Adaptive introgression from distant Caribbean islands contributed to the diversification of a microendemic radiation of trophic specialist pupfishes. PLOS Genetics pdf ScienceDaily
Richards EJ, Poelstra JW, Martin CH. 2018. Don’t throw out the sympatric species with the crater lake water: fine-scale investigation of introgression provides weak support for functional role of secondary gene flow. Evol Letters pdf
Richards EJ, Servedio MR, Martin CH. 2019. Searching for sympatric speciation in the genomic era. BioEssays pdf
I am interested in investigating the speciation process through the lens of fish behavior. This involves studying behavioral differences between diverging species, exploring interactions between species, and ultimately determining how these differences and interactions affect the evolution of reproductive isolation. When I am not observing fish, I enjoy cooking with my husband and hanging out with my two cats (Tulip and Alfalfa). Contact me
St. John ME, McGirr JA, Martin CH. 2019. The behavioral origins of novelty: did increased aggression lead to scale-eating in pupfishes? Beh Ecol pdf
St. John ME, Martin CH. 2019. Scale-eating specialists evolved adaptive feeding kinematics within a microendemic radiation of San Salvador Island pupfishes. preprint
By combining population genetics, functional genetics, and fitness experiments, I aim to gain a comprehensive and mechanistic understanding of adaptation. Specifically, I am interested in how genetic variation underlying adaptive traits is shaped across time and space in populations and how these loci interact with each other at a molecular level to produce phenotypes. To this end, I am focused on investigating how and why a rare scale eating trophic specialist evolved its novel and extreme craniofacial morphology. Contact me
I would define myself as an evolutionary biologist with particular interests in speciation and eco-evolutionary dynamics. I have a soft spot for cichlids and aim to study the feeding kinematics, assortative mating patterns, and genomic histories of the Cameroon crater lake radiations in order to better understand sympatric speciation. When I’m not learning about fish, you can probably find me at a coffee shop with a chai latte in one hand and bullet journal in the other. Contact me
As an evolutionary biologist, I am interested in the genetic mechanisms that facilitate diet adaptations, especially within fishes. In my previous research, I used comparative genomic and transcriptomic methods to identify candidate genes and loci under positive selection. Currently, I am working on how gut microbial community composition and function can contribute to the eco-evolutionary processes that drive dietary diversity within Cyprinodon pupfishes. If you see me with my headphones on, I’m either listening to 90’s rock music, a podcast, or a radio broadcast of a baseball team that resides in the Chavez Ravine. website Contact me
Pupfish collecting trip to Fort Fisher, NC
Pup-fishing in Great Lake, San Salvador Island, Bahamas
March for Science 2017 (guess which 2 are lab members!)
Currently a grad student in John Bruno's lab at UNC Chapel Hill
Demographics of diversification in Cameroon crater lake cichlids. Currently a postdoc in Anne Yoder's lab at Duke University
Currently staff at the North Carolina Museum of Natural Sciences
*Graduate students, †Postdoctoral scholars, •Undergraduate students
McGirr JA*, Martin CH. Ecological divergence in sympatry causes gene misregulation in hybrids. preprint
St. John ME, Martin CH. Scale-eating specialists evolved adaptive feeding kinematics within a microendemic radiation of San Salvador Island pupfishes. preprint
Martin CH, Richards EJ*. 2019. The paradox behind the pattern of rapid adaptive radiation: How can the speciation process sustain itself through an early burst? Annual Review of Ecology, Evolution, and Systematics 50:569-593. pdf
Martin CH, McGirr JA*, Richards EJ*, St. John ME*. 2019. How to investigate the origins of novelty: insights gained from genetic, behavioral, and fitness perspectives. Integrative Organismal Biology pdf
McGirr JA*, Martin CH. 2019. Hybrid gene misregulation in multiple developing tissues within a recent adaptive radiation of Cyprinodon pupfishes. PLOS One 14:e0218899. pdf
Richards EJ*, Servedio MR, Martin CH. 2019. Searching for sympatric speciation in the genomic era. BioEssays 41:1900047. pdf
St. John ME, McGirr JA, Martin CH. 2019. The behavioral origins of novelty: did increased aggression lead to scale-eating in pupfishes? Behavioral Ecology 30:557-569. pdf
Martin CH, Richards EJ*. 2019. The paradox behind the pattern of rapid adaptive radiation: how can the speciation process sustain itself through an early burst? Annual Review of Ecology, Evolution, and Systematics pdf
Davis AL•, Babb MH•, Lowe MC•, Yeh AT•, Lee BT•, Martin CH. 2019. Testing Darwin’s hypothesis about the wonderful Venus flytrap: marginal spikes form a “horrid prison” for moderate-sized insect prey. American Naturalist 93:309-317. pdf Media: Atlas Obscura Phys.org ScienceDaily
McGirr JA*, Martin CH. 2018. Parallel evolution of gene expression between trophic specialists despite divergent genotypes and morphologies. Evolution Letters 2:62-75. pdf
Richards EJ*, Poelstra JW†, Martin CH. 2018. Don’t throw out the sympatric species with the crater lake water: fine-scale investigation of introgression provides weak support for functional role of secondary gene flow. Evolution Letters 2:524-540. pdf
Poelstra JW†, Richards EJ*, Martin CH. 2018. Speciation in sympatry with ongoing secondary gene flow and a potential olfactory trigger in a radiation of Cameroon cichlids. Molecular Ecology 27:4270–4288. pdf
Martin CH, Turner BJ. 2018. Long-distance dispersal over land by fishes: extremely rare ecological events become probable over millennial timescales. Proceedings of the Royal Society B 285: 20172436. pdf
Zeng Y•, Martin CH. 2017. Oxford Nanopore sequencing in a research-based undergraduate course. preprint
Keren T, Kiflawi M, Martin CH, China V, Mann O, Holzman R. 2017. A complex performance landscape for suction-feeding reveals constraints and adaptations in a population of reef damselfish. preprint
Hernandez LP, Adriaens D, Martin CH, Wainwright PC, Masschaele B, Derick M. 2017. Building trophic specializations that result in substantial niche partitioning within a young adaptive radiation. Journal of Anatomy. 232:173-185. pdf
Richards EJ*, Martin CH. 2017. Adaptive introgression from distant Caribbean islands contributed to the diversification of a microendemic radiation of trophic specialist pupfishes. PLOS Genetics 13:e1006919. pdf Media: ScienceDaily
Stager JC, Alton K, Martin CH, King DT, Livingstone DT. 2017. On the age and origin of Lake Ejagham and its endemic fishes. 2017. Quaternary Research. 89:21-32. pdf
Martin CH, Höhna S. 2017. New evidence for the recent divergence of Devil's Hole pupfish and the plausibility of elevated mutation rates in endangered taxa. Molecular Ecology. 27:831-83. pdf
Martin CH, Höhna S, Crawford JE, Turner BJ, Richards EJ*, Simons LH. 2017. The complex effects of demographic history on the estimation of substitution rate: concatenated gene analysis results in no more than twofold overestimation. Proceedings of the Royal Society B 284:20170537. pdf
Martin CH, Erickson PA, Miller CT. 2017. The genetic architecture of novel trophic specialists: higher effect sizes are associated with exceptional oral jaw diversification in a pupfish adaptive radiation. Molecular Ecology 26:624-638. pdf supplement
McGirr JA*, Martin CH. 2016. Novel candidate genes underlying extreme trophic specialization in Caribbean pupfishes. Molecular Biology and Evolution 34:873-888. pdf supplement Media: Phys.org ScienceDaily
Martin CH. 2016. The cryptic origins of evolutionary novelty: 1,000-fold-faster trophic diversification rates without increased ecological opportunity or hybrid swarm. Evolution 70:2504-2519. pdf supplement
Higham TE, Rogers SM, Langerhans RB, Jamniczky HA, Lauder GV, Stewart WJ, Martin CH, Reznick DN. 2016. Speciation through the lens of biomechanics: locomotion, prey capture, and reproductive isolation. Proceedings of the Royal Society B 283:1294-1304. pdf
Martin CH. 2016. Context-dependence in complex adaptive landscapes: frequency and trait-dependent selection surfaces within an adaptive radiation of Caribbean pupfishes. Evolution 69:1406-1422. pdf supplement
Martin CH, Crawford JE, Turner BJ, Simons LH. 2016. Diabolical survival in Death Valley: recent pupfish colonization, gene flow, and genetic assimilation in the smallest species range on earth. Proceedings of the Royal Society B 283:23-34. pdf supplement Media: Nature Science Science Magazine BBC Discovery News New Scientist Quirks and Quarks CBC radio interview
Martin CH, Cutler JS, Friel JP, Dening Touokong C, Coop G, Wainwright PC. 2015. Complex histories of repeated gene flow in Cameroon crater lake cichlids cast doubt on one of the clearest examples of sympatric speciation. Evolution 69:1406-1422. pdf Jerry Coyne's jubilant blog posts: 1 2
Musilová Z, Indermaur A, Nyom ARB, Tropek R, Martin CH, Schliewen UK. 2014. Persistence of Stomatepia mongo, an endemic cichlid fish of the Barombi Mbo Crater Lake, Southwestern Cameroon, with notes on its life history and behavior. Copeia 2014:556-560. pdf
Martin CH, Feinstein LC. 2014. Novel trophic niches drive variable progress toward ecological speciation within an adaptive radiation of pupfishes. Molecular Ecology. 23: 1846-1862. pdf
Martin CH, Wainwright PC. 2013. A remarkable species flock of Cyprinodon pupfishes endemic to San Salvador Island, Bahamas. Bulletin of the Peabody Museum of Natural History. 54:231-240. pdf Media: UC Davis blog, Seriously Fish.
Schmitz L, Motani R, Oufiero CE,Martin CH, McGee MD, Wainwright PC. 2013. Potential enhanced ability of giant squid to detect sperm whales is an exaptation tied to their large body size. BMC Evolutionary Biology 13:226. pdf
Friedman M, Keck BP, Dornburg A, Eytan RI, Martin CH, Hulsey CD, Wainwright PC, Near TJ. 2013. Molecular and fossil evidence place the origin of cichlid fishes long after Gondwanan rifting. Proceedings of the Royal Society B 280:1770. pdf
Martin CH, Wainwright PC. 2013. On the measurement of ecological novelty: scale-eating pupfish are separated by 168 million years from other scale-eating fishes. PLOS One 8:e71164. pdf
Martin CH. 2013. Strong assortative mating by diet, color, size, and morphology but limited progress toward sympatric speciation in a classic example: Cameroon crater lake cichlids. Evolution 67:2114-2123. pdf
Martin CH, Wainwright PC. 2013. Multiple fitness peaks on the adaptive landscape drive adaptive radiation in the wild. Science 339:208-211. pdf supplement press release Media: Carl Zimmer's blog. Seriously Fish. Der Spiegel. Nothing in Biology Makes Sense.. WhyFiles. Davis Enterprise.
Schmitz L, Motani R, Oufiero CE, Martin CH, McGee MD, Gamarra AR, Lee JJ, Wainwright PC. 2013. Allometry indicates giant eyes of giant squid are not exceptional. BMC Evolutionary Biology 13:45. pdf
Martin CH. 2012. Weak disruptive selection and incomplete phenotypic divergence in two classic examples of sympatric speciation: Cameroon crater lake cichlids. American Naturalist 180:E90-109. pdf supplement press release
Martin CH, Wainwright PC. 2011. Trophic novelty is linked to exceptional rates of morphological diversification in two adaptive radiations of Cyprinodon pupfishes. Evolution 65:2197-2212. pdf.supplement. press release. F1000. Media: MSNBC. UC Davis Aggie. Practical Fishkeeping. KillieNutz. LiveScience. anti-evolution press: Lutheran. spoof attack.
Martin CH. 2010. Unexploited females and unreliable signals of male quality in a Malawi cichlid bower polymorphism. Behavioral Ecology 21:1195-1202. pdf
Martin CH, Genner MJ. 2009. A role for male bower size as an intrasexual signal in a Lake Malawi cichlid fish. Behaviour 146:963-978. pdf
Martin CH, Johnsen S. 2007. A field test of the Hamilton-Zuk hypothesis in the guppy Poecilia reticulata. Behavioral Ecology and Sociobiology 61:1897-1909. pdf
Yang AS, Martin CH, Nijhout HF. 2004. Geographic variation of caste structure among ant populations. Current Biology 14: 514-519. pdf.