A Shift In Feeding Behavior From The Juvenile To Adult In The Giant Acorn Barnacle Balanus nubilus Darwin With Observations On The Developmental Time Course Of Larvae.
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Authors
Hart, Alfred K.
Issue Date
2002
Type
Language
en_US
Keywords
Alternative Title
Abstract
Barnacles exhibit diverse cirral behaviors during feeding with the
repertoire of cirral fan behaviors of species associated with their
physiology, ecology, and phylogeny. However, feeding behaviors of
juveniles has not been significantly investigated. This study was
conducted to investigate the disparity of feeding behaviors of juveniles
to adults in Balanus nubilus. Specimens of diverse cirral fan lengths,
including recently metamorphosed juveniles, were collected and tried at
three seawater flows and in food presence or absence. Observations
were made of cirral behavior types, total active time, and rates of cirral
activity. Cirral activity and total time active were found to be inversely
correlated to cirral fan length. The feeding strategies of juveniles
differed from adults with active feeding predominating. Juveniles were
also found to exhibit cirral behaviors undescribed for this species
including a backward beating previously undistinguished in barnacles.
For many species, including Balanus nubilus, little information is
available on the developmental time course of the larval stages. Larvae
of Balanus nubilus were cultured from the eggs of gravid adults and
subsamples collected every other day elucidated a developmental time
course that was longer in contrast to others of the genus.
Description
1 broadside ; ill.
Citation
Publisher
Kalamazoo College