17 March 2011

After the program

Here’s a quick update on some of the activities of our students since leaving the program.

Cassandra Rivas (2007-2008) and Amery Yang (2008-2009) are both pursuing graduate degrees.

Stephanie Jimenez (2008-2009) recently published a peer reviewed paper based on her REU work.

Jimenez SA, Faulkes Z. 2011. Can the parthenogenetic marbled crayfish Marmorkrebs compete with other crayfish species in fights? Journal of Ethology 29(1): 115-120. DOI: 10.1007/s10164-010-0232-2


The parthenogenetic marbled crayfish, Marmorkrebs, has no known wild population, but has been introduced into natural ecosystems in two continents. Interactions with native crayfish, particularly through fighting, could affect the ecological impact of Marmorkrebs introductions. Marmorkrebs have been characterized anecdotally as having low levels of aggression, which could mitigate their potential to compete with native species. We isolated Marmorkrebs and Louisiana red swamp crayfish (Procambarus clarkii), then conducted size-matched intra- and interspecific pairings. Marmorkrebs were as likely to win a fight as P. clarkii, although contests between P. clarkii and Marmorkrebs were significantly faster to begin than contests between two Marmorkrebs. These results suggests that Marmorkrebs have the potential to compete with other species on the same level as P. clarkii, which is itself a highly successful introduced species around the world.

Keywords: aggression • crayfish • competition • invasive species • marbled crayfish • Marmorkrebs • Louisiana red swamp crayfish • Procambarus clarkii