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Related Concept Videos

Primary Production01:06

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
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Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
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Related Experiment Video

Updated: Jul 27, 2026

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
22:38

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

Microscale nutrient patches produced by zooplankton.

J T Lehman1, D Scavia

  • 1Division of Biological Sciences, Natural Science Building, The University of Michigan, Ann Arbor, Michigan 48109.

Proceedings of the National Academy of Sciences of the United States of America
|August 1, 1982
PubMed
Summary

Zooplankton release nutrient patches that algae use for phosphate absorption. These nutrient plumes are short-lived and affected by turbulence, influencing algae-zooplankton interactions.

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Area of Science:

  • Aquatic ecology
  • Microbial ecology
  • Biogeochemistry

Background:

  • Zooplankton play a crucial role in nutrient cycling within aquatic ecosystems.
  • Understanding nutrient patch dynamics is key to comprehending phytoplankton nutrient acquisition.
  • The direct observation of zooplankton-generated nutrient patches and subsequent algal uptake has been challenging.

Purpose of the Study:

  • To investigate the formation and characteristics of nutrient patches created by individual zooplankton.
  • To determine if and how algae exploit these zooplankton-derived nutrient patches.
  • To model the ecological interactions between zooplankton, nutrient plumes, and algae.

Main Methods:

  • Utilized track autoradiography and grain-density autoradiography to visualize nutrient distribution.
  • Observed the spatial and temporal dynamics of nutrient patches.
  • Simulated the effects of small-scale turbulence on nutrient patch dispersal.

Main Results:

  • Demonstrated that individual zooplankton generate localized, miniature patches of dissolved nutrients.
  • Showed that phytoplankton actively exploit these nutrient-rich microzones for phosphate absorption.
  • Confirmed that these nutrient patches are transient and susceptible to disruption by turbulence.

Conclusions:

  • Zooplankton actively shape their immediate environment by releasing nutrient patches.
  • Algal utilization of these patches represents a significant microscale interaction in aquatic food webs.
  • The findings support a model of encounter-based nutrient acquisition driven by zooplankton activity.