71st Annual Meeting
American Malacological Society
June 26-30 2005
Call for Papers & PostersGuidelines
Non-Plenary oral presentations may not exceed 15 minutes, with 5 additional minutes for questions. Posters may not exceed 46" x 46" (120 cm x 120 cm ). Submission of abstracts for all sessions of AMS/WSM 2005 will be received by e-mail only as attached MS Word files.
To be eligible for a student award, you must be the sole author or your paper or poster. If this issue is problematic, contact one of the organizers (firstname.lastname@example.org or email@example.com) and we will be glad to discuss this prerequisite at length with your academic advisor. You must be an AMS or WSM student member in good standing, and either currently enrolled in a degree-granting academic program, or be a 2005 graduate.
Inducible Offenses in Marine Grazers
Dianna K. Padilla
Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11794-5245, USA, firstname.lastname@example.org
Several species of marine molluscan grazers have been demonstrated to express morphological plasticity in their radula. The adaptive value of these inducible offenses (traits that enhance the abilities of consumers or competitors) can be limited because of long lag times between when an individual receives environmental cues and the new morphologies can be used. Behavioral plasticity associated with dispersal potential and food preference could work to minimize this adaptive limitation if individuals disperse less from food substrates/habitats they have been exposed to most recently, and disperse readily from alternate habitats. This type of behavioral response could increase the amount of time an individual resides in a given habitat, minimizing the consequences of morphology-habitat mismatches due to a long lag time. Detection and response to local predation risk could also enhance the adaptive value of such plasticities. Two sympatric species of littorinids in the genus Lacuna have radular morphologies that are inducible by food and environmental cues, and relatively long lag times (20-28 d) between when they sense a new environment and new teeth are ready to use. In experiments, snails disperse less frequently from food/environments in which they have been reared, and more frequently from alternate foods they have not recently experienced. Although these two species co-occur and are closely related, they show differences in dispersal behavior with one species dispersing much more readily than the other. Dispersal is also enhanced by chemical detection of predators, especially visual predators.