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Related Experiment Video

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Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

Foraminifera may structure meiobenthic communities.

G Thomas Chandler¹

¹Zoologisches Institut und Museum, Universität Hamburg, D-2000, Hamburg 3, Federal Republic of Germany.

|March 18, 2017

Summary

This summary is machine-generated.

The benthic foraminiferan Ammonia beccarii negatively impacts the copepod Amphiascoides limicola by depleting microfloral food sources in sediments. This study reveals that microfloral depletion, not pelletization or mucus, drives this amensalistic relationship.

Keywords:

Competition Copepoda Dispersion Foraminifera Meiobenthic

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Published on: August 3, 2016

Area of Science:

Marine Biology
Benthic Ecology
Foraminifera Research

Background:

Ammonia beccarii, a cosmopolitan foraminiferan, forms dense aggregates that alter sediment properties.
These aggregates are associated with reduced microfloral food availability.
Previous field observations suggested a negative interaction between A. beccarii and the copepod Amphiascoides limicola.

Purpose of the Study:

To investigate the interaction between Ammonia beccarii and Amphiascoides limicola under controlled conditions.
To determine the impact of A. beccarii on different life stages of A. limicola.
To identify the mechanisms by which A. beccarii inhibits A. limicola.

Main Methods:

Culturing A. beccarii and A. limicola separately in sediment microcosms.
Conducting field experiments with seeded sediment patches to observe A. limicola densities in relation to A. beccarii presence.
Performing choice experiments with A. limicola copepodites in microcosms with varying sediment treatments (pelletization, mucus, microflora).

Main Results:

A. limicola naupliar and copepodite densities were significantly lower in sediments with high A. beccarii concentrations.
Choice experiments indicated that A. limicola copepodites avoided sediments with combined pelletization and low microflora.
Colonization was facilitated by mucus alone or microfloral-rich pelletized sediments, but inhibited by pelletization and mucus binding with low microflora.

Conclusions:

Ammonia beccarii exerts an inhibitory effect on Amphiascoides limicola.
The primary mechanism for this inhibition is the depletion of local microfloral resources within A. beccarii aggregates.
Sediment pelletization and mucus binding by A. beccarii contribute to this effect indirectly by altering the microhabitat and reducing food availability.