I'm an undergraduate who's been working on the population genetics and genus-wide phylogeny of freshwater prawns (Macrobrachium), currently under the oversight of Gonzalo Giribet at Harvard. I've visited the San Marcos River several times and, if things work out, will be going to Texas again sometime within the next two weeks.
Specifically, I'd like to investigate some very credible reports of prawns being captured upstream of the dam at Lake Corpus Christi as well as to confirm the presence of introduced M. rosenbergii in the Buffalo Bayou area.
The first could have some important implications for population management, since it doesn't seem to be compatible with our conventional understanding of these prawns' life history (i.e., complete amphidromy and thus larval dependence on saltwater). The second (I've seen photographs of mid-sized specimens from the bay but don't know of any preserved material) would be a new record for Texas, and a possible indication that this species has been expanding its range in the northern Gulf of Mexico.
I plan to collect tissue samples and take photographs for morphometric analysis in addition, but my contacts at Texas State would probably be interested in live specimens as well.
If any of you have familiarity with Texan prawns or with the areas I've mentioned, please let me know.
Edited by Ouassous, 08 March 2010 - 08:44 PM.