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Raymond Bauer

1969 B.S. (Biology) University of Missouri, Kansas City, KA

1976 Ph.D (Marine Biology) Scripps Institution of Oceanography, University of California, San Diego, CA



My areas of interest include marine biology, invertebrate zoology, and the biology of crustaceans (shrimps, crayfishes, stomatopods, crabs etc.). Specialized research focuses on structure and function, reproductive ecology, sexual systems mating systems, reproductive migrations of freshwater shrimps, and a variety of other aspects of the biology of crustaceans. Please visit the Bauer Research Website. A short summary is given below.

Reproductive biology is a major area of research in this laboratory. One aspect is reproductive ecology, specifically, what are environmental factors and selective pressures which explain latitudinal variation in spawning patterns in shrimps and other crustaceans? Another focus is on the sexual systems of shrimps, especially hermaphroditic species. Work has been and is being done on protandry (sex change from male to female) and simultaneous hermaphroditism in various species. The goal of this comparative work is to understand why the various forms of hermaphroditism evolve in some species but not others. Mating systems and male/female mating strategies of shrimps, stomatopods, and other crustaceans are yet another focus of research in this lab. All of these studies involve field work, behavioral observations using time-lapse video, and experimental work to test hypotheses on the evolution of mating systems and strategies.

Much of my work is on the adaptive value of structures of unknown or undocumented function. One ongoing project is on antifouling mechanisms and behavior (how do shrimps and other crustaceans maintain their bodies free of aquatic "dirt" and of fouling organisms that find their hard exoskeletons a good place to grow?). Fouling can severely impair sensory, respiratory, and locomotory systems of crustaceans. In this work, I like to use a mix of descriptive morphology (with scanning electron microscopy to document fine details), behavioral observations (often with time-lapse video), and manipulative experiments testing hypotheses on function. Another area of interest in functional morphology has been the mechanics of insemination in caridean and penaeoidean shrimps. My work in functional morphology is always undertaken with an evolutionary perspective, i.e., what is the adaptive value of structures studied and how do variations in these structures help us to understand the evolutionary history (phylogeny) of this group?

Recent work has focused on the reproductive migrations of freshwater river shrimps, especially Macrobrachium ohione in the Mississippi river system. Although freshwater as adults, the larvae are still tied to the sea and must develop in coastal bays, a life history strategy known as amphidromy. We are discovering how females migrate to the coast from far upstream to hatch the larvae and are documenting the massive juvenile migrations from the coast back upriver. As with the other topics given above, there is much to discover about these migrations and their importance in conservation of amphidromous species.

Feel free to contact me at this address:

Raymond T. Bauer
Department of Biology
PO Box 42451, Lafayette
LA 70504

Telephone: (337) 482-6435