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J. Todd Streelman
Georgia Institute of Technology
EcologyCichlidGeneticsEvolutionary biologyBiology
47Publications
27H-index
3,147Citations
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Publications 47
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#1Nicole M. Baran (Georgia Institute of Technology)
#2J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
In Lake Malawi, two ecologically distinct lineages of cichlid fishes (rock- versus sand-dwelling ecotypes, each comprised of over 200 species) evolved within the last million years. The rock-dwelling species (Mbuna) are aggressively territorial year-round and males court and spawn with females over rocky substrate. In contrast, males of sand-dwelling species are not territorial and instead aggregate on seasonal breeding leks in which males construct courtship "bowers" in the sand. However, littl...
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#1Ryan Fredric Bloomquist (Georgia Institute of Technology)H-Index: 5
#2Teresa E. Fowler (Georgia Institute of Technology)H-Index: 3
Last. J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
view all 8 authors...
In Lake Malawi cichlids, each tooth is replaced in one-for-one fashion every ∼20 to 50 d, and taste buds (TBs) are continuously renewed as in mammals. These structures are colocalized in the fish mouth and throat, from the point of initiation through adulthood. Here, we found that replacement teeth (RT) share a continuous band of epithelium with adjacent TBs and that both organs coexpress stem cell factors in subsets of label-retaining cells. We used RNA-seq to characterize transcriptomes of RT ...
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#1Ryan A. York (Stanford University)H-Index: 3
#2Chinar Patil (Georgia Institute of Technology)H-Index: 2
Last. J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
view all 10 authors...
Many behaviors are associated with heritable genetic variation [Kendler and Greenspan (2006) Am J Psychiatry 163:1683–1694]. Genetic mapping has revealed genomic regions or, in a few cases, specific genes explaining part of this variation [Bendesky and Bargmann (2011) Nat Rev Gen 12:809–820]. However, the genetic basis of behavioral evolution remains unclear. Here we investigate the evolution of an innate extended phenotype, bower building, among cichlid fishes of Lake Malawi. Males build bowers...
4 CitationsSource
#1Ryan A. York (Stanford University)H-Index: 3
#2Allie E. Byrne (Stanford University)H-Index: 1
Last. Russell D. Fernald (Stanford University)H-Index: 58
view all 7 authors...
The evolutionary diversification of animal behavior is often associated with changes in the structure and function of nervous systems. Such evolutionary changes arise either through alterations of individual neural components (mosaically) or through scaling of the whole brain (concertedly). Here we show that the evolution of a specific courtship behavior in Malawi cichlid fish, the construction of mating nests known as bowers, is associated with rapid, extensive, and specific diversification of ...
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#1Ajay Ramakrishnan Varadarajan (Georgia Institute of Technology)H-Index: 1
#2Rohini Mopuri (Georgia Institute of Technology)H-Index: 1
Last. Patrick T. McGrath (Georgia Institute of Technology)H-Index: 14
view all 4 authors...
The thousands of species of closely related cichlid fishes in the great lakes of East Africa are a powerful model for understanding speciation and the genetic basis of trait variation. Recently, the genomes of five species of African cichlids representing five distinct lineages were sequenced and used to predict protein products at a genome-wide level. Here we characterize the evolutionary relationship of each cichlid protein to previously sequenced animal species. We used the Treefam database, ...
1 CitationsSource
#1Nicole M. Baran (Georgia Institute of Technology)H-Index: 8
#2Patrick T. McGrath (Georgia Institute of Technology)H-Index: 14
Last. J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
view all 3 authors...
Abstract Animal behavior is ultimately the product of gene regulatory networks (GRNs) for brain development and neural networks for brain function. The GRN approach has advanced the fields of genomics and development, and we identify organizational similarities between networks of genes that build the brain and networks of neurons that encode brain function. In this perspective, we engage the analogy between developmental networks and neural networks, exploring the advantages of using GRN logic ...
9 CitationsSource
#1Ryan Fredric Bloomquist (Georgia Regents University)H-Index: 5
#2Nicholas F. Parnell (Georgia Institute of Technology)H-Index: 5
Last. J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
view all 7 authors...
Teeth and taste buds are iteratively patterned structures that line the oro-pharynx of vertebrates. Biologists do not fully understand how teeth and taste buds develop from undifferentiated epithelium or how variation in organ density is regulated. These organs are typically studied independently because of their separate anatomical location in mammals: teeth on the jaw margin and taste buds on the tongue. However, in many aquatic animals like bony fishes, teeth and taste buds are colocalized on...
22 CitationsSource
#1Ryan A. York (Stanford University)H-Index: 3
#2Chinar Patil (Georgia Institute of Technology)H-Index: 2
Last. Russell D. Fernald (Stanford University)H-Index: 58
view all 6 authors...
Despite considerable research, we still know little about the proximate and ultimate causes behind behavioral evolution. This is partly because understanding the forces acting on behavioral phenotypes requires the study of species-rich clades with extensive variation in behavioral traits, of which we have few current examples. In this paper, we introduce the bower-building cichlids of the Lake Malawi adaptive radiation, a lineage with over 100 species, each possessing a distinct male extended ph...
12 CitationsSource
#1J. Todd Streelman (Georgia Institute of Technology)H-Index: 27
#2Ryan Fredric Bloomquist (Georgia Institute of Technology)H-Index: 5
Last. Teresa E. Fowler (Georgia Institute of Technology)H-Index: 3
view all 3 authors...
In many aquatic vertebrates, including bony and cartilaginous fishes, teeth and taste buds colocalize on jaw elements. In these animals, taste buds are renewed continuously throughout life, whereas teeth undergo cycled whole-organ replacement by various means. Recently, studies of cichlid fishes have yielded new insights into the development and regeneration of these dental and sensory oral organs. Tooth and taste bud densities covary positively across species with different feeding strategies, ...
2 CitationsSource
#1David Brawand (University of Oxford)H-Index: 11
#2Catherine E. WagnerH-Index: 16
Last. Federica Di Palma (Broad Institute)H-Index: 23
view all 75 authors...
Cichlid fishes are famous for large, diverse and replicated adaptive radiations in the Great Lakes of East Africa. To understand the molecular mechanisms underlying cichlid phenotypic diversity, we sequenced the genomes and transcriptomes of five lineages of African cichlids: the Nile tilapia (Oreochromis niloticus), an ancestral lineage with low diversity; and four members of the East African lineage: Neolamprologus brichardi/pulcher (older radiation, Lake Tanganyika), Metriaclima zebra (recent...
478 CitationsSource
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