BioOne.org will be down briefly for maintenance on 17 December 2024 between 18:00-22:00 Pacific Time US. We apologize for any inconvenience.
How to translate text using browser tools
1 June 2003 DRAMATIC PHENOTYPIC PLASTICITY IN BARNACLE LEGS (BALANUS GLANDULA DARWIN): MAGNITUDE, AGE DEPENDENCE, AND SPEED OF RESPONSE
Kerry B. Marchinko
Author Affiliations +
Abstract

The precise dependence of barnacle leg form on flow suggests the wave-swept environment imposes strong selection on suspension feeding limbs. I conducted three experiments to determine the mechanism, age dependence, and response time of cirrus variation in the acorn barnacle Balanus glandula. (1) To test whether cirrus variation arises via genetic or environmental mechanisms, I transplanted juvenile barnacles from one wave-exposed and one protected population into high and low flow conditions. Both populations exhibited similar abilities to modify cirri in response to experimental velocities: transplanted barnacles grew legs up to 84% longer in low flow. A small (up to 24%), but significant difference between source populations suggested slight genetic divergence in leg form. (2) Because flow is heterogeneous over space and time, I tested whether cirrus plasticity was limited to juveniles by transplanting both juveniles and adults from exposed and protected shores into quiet water. Remarkably, both juveniles and adults from the wave-exposed population produced legs over 100% longer than the original population, whereas protected barnacles remained unchanged. (3) A third transplant of adults into quiet water demonstrated that wave-exposed B. glandula modified cirrus form very quickly—within 18 days, or one to two molts. Results from these experiments suggest that variation in cirrus form is largely environmentally induced, but genetic differences may account for some variation observed among field populations; spatial and temporal flow heterogeneity appear to have selected for extreme flexibility of feeding form throughout a barnacle's life; and flow heterogeneity in the wave-swept environment appears to have selected for rapid ecophenotypic responses in the form of feeding structures.

Kerry B. Marchinko "DRAMATIC PHENOTYPIC PLASTICITY IN BARNACLE LEGS (BALANUS GLANDULA DARWIN): MAGNITUDE, AGE DEPENDENCE, AND SPEED OF RESPONSE," Evolution 57(6), 1281-1290, (1 June 2003). https://doi.org/10.1554/02-477
Received: 13 August 2002; Accepted: 6 January 2003; Published: 1 June 2003
JOURNAL ARTICLE
10 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

KEYWORDS
Barnacle
Environmental heterogeneity
genotype-by-environment interaction
phenotypic plasticity
suspension feeding
wave-swept
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top