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Related Experiment Video

Updated: Jun 28, 2026

The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression

The Barnacle Balanus improvisus as a Marine Model - Culturing and Gene Expression

Published on: August 8, 2018

Modeling variation in interaction strength between barnacles and fucoids.

Rebecca L Kordas¹, Steve Dudgeon

¹Department of Biology, California State University, Northridge, CA, 91330-8303, USA. kordas@zoology.ubc.ca

|November 1, 2008

Summary

Barnacle life stages differently impact seaweed recruits. Juvenile barnacles negatively affect recruits due to large populations, while adults may offer weak facilitation, influencing seaweed community structure.

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Area of Science:

Marine ecology
Interspecific interactions
Population dynamics

Background:

Species interactions vary with ontogeny, environment, and population density.
In situ interaction strength estimation is logistically challenging and context-specific.
Understanding these dynamics is crucial for marine community structure.

Purpose of the Study:

To combine field data and modeling to assess barnacle interaction strengths on seaweed recruits.
To explore how life stage, population density, and settlement timing affect fucoid germling abundance.
To predict the influence of barnacle-seaweed interactions on New England rocky shore communities.

Main Methods:

Field experiments estimating interaction strength for barnacle life stages (juvenile, adult, cyprid larvae) on Ascophyllum nodosum germlings.
Modeling to explore consequences of per capita and population-level interaction variability.
Simulations of settlement timing effects on fucoid germling abundance.

Main Results:

Juvenile barnacles have a weak per capita effect, but large populations negatively impact germling abundance; mortality weakens this over time.
Adult barnacles likely weakly facilitate germlings, with stronger population-level effects due to higher survival.
Settlement timing variation had minimal influence on yearling germling abundance.

Conclusions:

Barnacle life stages exert differential impacts on fucoid germling abundance, affecting population demographics.
Adult barnacle density positively correlates with germling abundance, while juvenile density shows a negative correlation.
These interactions are significant for maintaining fucoid-dominated communities on sheltered rocky shores.