HR: 1340h
AN: ED43A-0265    [Abstracts]
TI: Abundance, Health and Status of Sand Crabs at Ocean Beach, San Francisco: Comparisons From two Summers, 2003 and 2004
AU: Conrad-Saydah, A
EM: acs@calacademy.org
AF: California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103
AU: MacCormack, D
EM: cis@calacademy.org
AF: California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103
AU: * Velarde, M
EM: cis@calacademy.org
AF: California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103
AU: Masters, D
EM: cis@calacademy.org
AF: California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103
AU: Walton, M
EM: cis@calacademy.org
AF: California Academy of Sciences, 875 Howard Street, San Francisco, CA 94103
AB: Interns from the California Academy of Sciences in San Francisco monitored Pacific mole crabs, Emerita analoga, commonly known as sand crabs, at Ocean Beach, San Francisco for the second consecutive summer. Comparisons from two data sets revealed trends in crab abundance, size and location. Changes in abundance and location may have been related to water temperature and predation. Dissections of random crabs from all gender classes allowed inspection of parasitism on the crabs. The dissections revealed increased numbers of parasites in larger crabs (especially females with eggs) and in crabs collected later in the summer season. Crab parasitism may be connected to population changes of species predating the sand crabs.
DE: 0805 Elementary and secondary education
SC: Education and Human Resourcese [ED]
MN: 2004 AGU Fall Meeting