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Freshwater Microbial Ecology

Freshwater Microbial Ecology

Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...

Marine Microbial Ecology

Marine Microbial Ecology

Marine microbial ecosystems are shaped by distinct physicochemical limits, including high salinity, low nutrient availability, and fluctuating oxygen levels. These conditions favor smaller microbial cell sizes, which maximize their surface-to-volume ratio for efficient nutrient uptake.Microbial activity and community composition are closely linked to biogeochemical cycles, particularly in dynamic environments like estuaries, where halotolerant microbes thrive in response to variable salinity...

Other Algae

Other Algae

The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...

Microbial Mats

Microbial Mats

Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...

Overview of Algae

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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...

Primary Production

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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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Related Experiment Video

Updated: May 23, 2026

An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles

An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles

Published on: April 19, 2018

Thin phytoplankton layers: characteristics, mechanisms, and consequences.

William M Durham¹, Roman Stocker

¹Ralph M. Parsons Laboratory, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. durham@mit.edu

Annual Review of Marine Science

|March 31, 2012

Summary

Phytoplankton thin layers, narrow bands of photosynthetic cells, are crucial in marine ecosystems. Understanding their formation and persistence is key to predicting their ecological impact.

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Area of Science:

Marine biology
Biological oceanography
Phytoplankton ecology

Background:

Phytoplankton form dense aggregations called thin layers in narrow horizontal bands.
These layers have complex interactions with the physical environment, cell behavior, and higher trophic levels.
Mechanisms for thin layer formation and persistence against turbulent dispersion are actively researched.

Purpose of the Study:

To connect mechanistic hypotheses with field observations of phytoplankton thin layers.
To gain deeper insight into the phenomena shaping thin layer dynamics.
To establish a mechanistic understanding for predicting the ecological effects of thin layers.

Main Methods:

Field observations of phytoplankton thin layers.
Analysis of physical and biological factors influencing layer dynamics.
Development and testing of mechanistic hypotheses.

Main Results:

Complex linkages identified between thin layers, physical environment, cell behavior, and trophic levels.
Several proposed mechanisms for layer formation and persistence.
Need for integrating mechanistic hypotheses with empirical data.

Conclusions:

A mechanistic understanding of phytoplankton thin layer dynamics is essential.
Predicting the ecological impact of thin layers requires knowledge of underlying biological and physical processes.
Further research should focus on connecting theoretical models with field observations.