Research in my lab focuses on the anatomy, evolution, systematics, and biogeography of various marine mammals especially cetaceans. Projects currently being pursued include ultrastructure of baleen, vibrational analysis of the tympanoperiotic of whales, comparative anatomy and feeding evolution in phocids, and re-evaluation of Pliophoca from Italy and monachine phylogeny. My research is currently funded by NSF (Systematic Biology) and I am accepting MS students and Ph.D. students (Joint Ph.D. program in Evolutionary Biology with UCR).
Comparative anatomy and evolution of feeding in phocids
Sarah Stachura Kienle’s MS thesis project is a comparative analysis of the four feeding types (suction feeding, grip and tear feeding, pierce feeding, and filter feeding) employed in extant phocids (seals) using 3D morphometrics and comparative phylogenetic analyses. Quantitative feeding characters will be used to examine type(s) of feeding in stem phocids to understand the evolutionary origins of each feeding strategy. Sarah also loves going to see the sea lions and harbor seals in La Jolla, playing in tide pools, and being a part of the Fantastic Flipper Force.
Ultrastructure of baleen in mysticete whales: evolutionary and ecological implications
Nicholas Zellmer’s MS thesis examines the ultrastructure of baleen plates and bristles in Mysticeti using various light and electron microscope based techniques. The data collected on baleen ultrastructure will be used to describe inter and intraspecific morphological variation and investigate the driving forces, such as phylogeny and ecology, behind species specific morphologies. Nicholas also enjoys hitting the beach and going for ridiculously long runs.
Form, function and phylogeny: a quantitative analysis of the cetacean tympanoperiotic complex
William Ary’s MS thesis uses vibrational analysis, finite element modeling, and geometric morphometrics to quantify the relationship between shape and function in cetacean earbones, then mapping that variation onto a phylogeny to see how shape varies within and between groups.
Fin whale baleen SDSU, 2012
(from left: A.. Berta, W. Ary, S. Kienle, N. Zellmer, E. Ekdale, J. Martin, J. El Adli (U. Michigan).
Gray whale head dissection SDSU, April, 2012
(from left: J. Martin, T. Cranford, K. Albertine (editor Anatomical Record), Witmer’s tech, T. Deméré, J. Reidenberg (Mt Sinai Medical School), E. Ekdale, J. El Adli, W. Ary, L. Witmer (Ohio Univ. Medical School) , N. Zellmer, 2 anatomy students and S. Kienle.
FORMER MS STUDENTS
Peter Adam PADAM@firstname.lastname@example.org
Peter’s MS research involved mapping feeding and locomotor characters onto a phylogeny of pinnipeds. Peter earned a Ph.D. in 2007 from the University of California, Los Angeles and he is an Assistant Professor, Department of Biology, Northwest Missouri State University, Maryville, Missouri.
Celia Barroso email@example.com
Celia Barroso’s MS thesis (co-chaired by Ted Cranford) completed in Fall, 2010 involved investigation of the anatomy and evolution of mandibular shape across the Odontoceti using x-ray CT and geometric morphometrics (Barroso et al., 2012). The catalyst for this study was the recent discovery (Cranford et al. 2008) that sounds are received through an "open door" of bone on the posteriomedial aspect of the mandibles. Celia is working for an environmental consulting firm in the LA area.
Morgan Churchill firstname.lastname@example.org
Morgan completed a MS in 2007. His research was a comprehensive morphological study of balaenoid phylogeny including extant species and several well known fossil taxa. He also evaluated the origin and diversification of balaenoids through time in the context of a phylogenetic framework (Churchill et al., 2011). Morgan is a Ph.D. student in the Clementz lab at the University of Wyoming, Laramie, Wyoming.
Lisa Cooper email@example.com
Lisa completed a MS in 2004. Her research was an evaluation of the phylogenetic and functional significance of the forelimb in mysticetes. In addition to forelimb osteology, the soft tissue anatomy of several extant species were examined using dissection and histology. Lisa completed a Ph.D. in the Thewissen lab at Kent State University, Ohio and a postdoc in the Sears lab at University of Illinois, Champaign-Urbana, Illinois. Lisa is currently an Assistant Professor in the Department of Anatomy and Neurobiology, Northeastern Ohio Medical University, Rootstown , OH
Liliana Fajardo-Mellor firstname.lastname@example.org
Liliana completed a MS in 2005. Her research was a comprehensive morphological study of phocoenids (porpoises) including extant species and a few well know fossil species. She also considered the origin and diversification of phocoenids through time within the context of the phylogenetic framework. Liliana completed a Ph.D. in the Department of Anatomy and Cell Biology at the Brody School of Medicine, East Carolina University, Greenville, North Carolina. She is currently a postdoc at
Boise State University, Idaho.
Carrie Fyler email@example.com
Carrie completed a MS in 2003. Her research was a phylogenetic analysis of monk seals using molecular sequence data. This phylogenetic framework was then used to consider the historical biogeography of the group. Carrie completed a Ph.D. in the Caira lab at the University of Connecticut. She is a new mom living on Long Island, NY.
Frances Johnson firstname.lastname@example.org
Fran completed a MS in 2007. Her research was a phylogenetic study of living South American foxes based on morphology (cranial, dental, postcranial, soft anatomical characters) using parsimony and Bayesian analyses. The origin and radiation of South American foxes was considered in an ecologic and evolutionary context. Fran is in Veterinary school at UC Davis.
Cassie Johnston Cassie.Johnston1@gmail.com
Cassie completed a MS in 2009. Her research was on the comparative anatomy and evolutionary history of suction feeding in cetaceans with emphasis on the gray whale. Cassie is employed by an environmental consulting firm in the LA area.
Mandy Keogh email@example.com
Mandy completed a MS in 2006. Her research involved comparative histological examination of the corpus callosum morphometry (relative size, fiber density) in representative odontocetes consider in both phylogenetic and functional contexts.
Mandy completed a Ph.D. from the University of Alaska, Fairbanks and is now employed as an Assistant Professor in the Department of Biological Sciences at the University of Alaska, Fairbanks, Alaska
Jessica will complete a MS in Fall, 2012. Her MS thesis investigates the evolutionary history of balaenopterid (rorquals) whales using morphology and divergence dating. Also, included is description and addition into the phylogenetic analysis of a new fossil balaenopterid from the Pliocene San Diego Formation. Jessica is currently seeking employment in southern California.
Michael McGowen firstname.lastname@example.org
Michael (Rocky) completed a MS in 2005. His research mapped characters related to feeding morphology, behavior and diet onto a phylogeny of mysticetes. Rocky completed a Ph.D. in the Gatesy lab at the University of California, Riverside and is now a postdoc at Wayne State University, Detroit, Michigan in the Wildman lab.
Megan McKenna email@example.com
Megan completed a MS in 2005. Her research involved detailed morphological description of the melon among various lineages of odontocetes derived from CT images.
Melon structure and function was also considered in an evolutionary context (McKenna et al., 2011). Megan is completed a Ph.D. in Biological Oceanography from the University of California, San Diego (Scripps Institute of Oceanography). She is now employed as a bioacoustician for the National Park Service.
Rachel Racicot firstname.lastname@example.org
Rachel completed a MS in 2007. Her research involved detailed morphological description of the pterygoid sinus among extant species and a fossil phocoenid derived from dissections and CT images (Racicot and Berta, in press). The pterygoid sinus is one component of a complex sinus system associated with sound production and reception. She considered the evolution of the pterygoid sinus among phocoenids and evaluated its phylogenetic and functional significance. Rachel is a Ph.D. student in the Gauthier lab at Yale University.
Amanda Rychel email@example.com
Amanda completed a MS in 2002. Her research used both mitochondrial genes and a nuclear marker to reconstruct phylogenetic relationships among mysticetes. Amanda completed a Ph.D. in the Swalla lab at the University of Washington and a postdoc at the UW. She is currently employed at Stratos Genomics, Seattle, WA.
Alex Sanchez firstname.lastname@example.org
Alex completed a MS in 2007. His thesis investigated forelimb osteology and muscular anatomy of representative odontocetes in an evolutionary context. Alex is currently teaching part-time at Mira Costa College in southern California.
Breda Walsh email@example.com
Breda completed a MS in 2006. Her research was a comparative morphologic study of growth patterns in mysticetes based on ontogenetic stages of cranial ossification among extant species and several fossil species. Relative age determinations were based on sequence of cranial suture closure. Breda is employed at a research lab at UC San Diego.
Josh Yonas firstname.lastname@example.org
Josh completed a MS thesis in Fall, 2008 on the anatomy and evolution of aquatic locomotion in walruses. He investigated fore and hind limb osteology and myology in the walrus using dissection, x-ray and MRI imaging. The evolution of locomotion in fossil and modern walruses and other pinnipeds was also considered. Josh is in Veterinary school in Pomona, CA.
Samantha Young email@example.com
Samantha completed a MS thesis in Fall, 2011. Her project examined the anatomy
(including SEM and morphometrics) and evolution of baleen. She also investigated baleen (bristle morphology) and its correlation with prey type. She is employed in the Education Department at the San Diego Zoo Institute for Conservation Research.
Representative Publications (last 5 years):
Racicot, R. and A. Berta. In press. Comparative morphology of true porpoise (Cetacea: Phocoenidae) pterygoid sinuses: phylogenetic and functional implications. Journal of Morphology.
Liwanag, H.E.M., A. Berta, D.P. Costa, M. Aubrey and T.M. Williams (2012). Morphological and thermal properties of mammalian insulation: the evolution of fur for aquatic living. Biological Journal of the Linnean Society 106: 926-939.
Barroso, C., T.W. Cranford and A. Berta (2012). Shape analysis of odontocete mandibles: functional and evolutionary implications. Journal of Morphology doi:10.10.1002/jmor.20040.
Berta, A. (2012). Return to the Sea: the Life and Evolutionary Times of Marine Mammals. University of California Press, Berkeley, CA, 224 pp.
Berta, A. (2011). (Review of). Carnivoran Evolution (eds. A. Goswami and A. Friscia), Cambridge University Press, Systematic Biology 60(2): 241-243.
Berta, A. and M. Churchill. 2011. Pinniped taxonomy: review of the evidence for description of currently recognized pinniped species and subspecies. Mammal Review. doi:10.1111/j.1365-2907.2011.00193.x
Churchill, M., A. Berta, and T. Deméré. (2011). The systematics of right whales (Mysticeti: Balaenidae). Marine Mammal Science. doi: 10.1111/j.1748-7692.2011.00504x
Ekdale, E., A Berta, and T. Deméré (2011). The comparative osteology of the petrotympanic complex in extant baleen whales (Cetacea: Mysticeti). PLoS ONE6(6):e21311.doi:10.1371/journal.pone.0021311.
Walsh, B. and A. Berta (2011). Occipital ossification of balaenopteroid mysticetes. The Anatomical Record doi: 10.002/ar.21340.
Galatius, A., A. Berta, M.S. Frandsen, and N.P. Goodall. (2011). Interspecific variation in ontogeny and paedomorphosis among phocoenids. Journal of Morphology 272(2): 136-148.
Johnston, C. and A. Berta (2010). Comparative anatomy and evolutionary history of suction feeding in cetaceans. Marine Mammal Science, doi 10.1111/j.1748-7692.2010.00420.
Sanchez, A. and A. Berta (2010). The comparative anatomy and evolution of the odontocete flipper. Marine Mammal Science, 26(1): 140-160.
Johnston, C., T. Deméré, A. Berta, J. St. Leger and J. Yonas (2010). Observations on the musculoskeletal anatomy of the head of a neonate gray whale (Eschrichtius robustus). Marine Mammal Science, 26(1): 186-194.
Berta, A. (2009). Systematics, pp. 1148-1152, Encyclopedia of Marine Mammals (W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds.), 2nd ed., Academic Press, San Diego.
Berta, A. (2009). Pinnipedia, Overview, pp. 878-885 Encyclopedia of Marine Mammals (W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds.), 2nd ed., Academic Press, San Diego, CA.
Berta, A. (2009). Pinniped evolution, pp. 861-868, Encyclopedia of Marine Mammals (W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds.),2nd ed., Academic Press, San Diego, CA.
Berta, A. and T.A. Deméré. (2009). Mysticetes, Evolution, pp. pp. 749-753, Encyclopedia of Marine Mammals (W.F. Perrin, B. Wursig, and J.G.M. Thewissen, eds.),2nd ed., Academic Press, San Diego, CA.
Berta, A. (Review of) (2008). Neptune’s Ark, by David Rains Wallace. Jour. Mamm. Evol. 15:143-145.
Deméré, T.A. and A. Berta (2008). Cranial anatomy of the toothed mysticete Aetiocetus weltoni and its implications for aetiocetid phylogeny. Zoological Journal of Linnean Society, 154(2): 308-352.
Deméré, T.A., M. R. McGowen, A. Berta, and J. Gatesy (2008). Morphological and molecular evidence for a step-wise evolutionary transition from teeth to baleen in mysticete whales. Systematic Biology 57(1): 15-37.
Coordinator, Joint Doctoral Program in Evolutionary Biology
Ph.D. University of California, Berkeley
Department of Biology
San Diego State University
5500 Campanile Dr.
San Diego, CA 92182-4614