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Diversity of Protists II

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

Diversity of Protists III

Diversity of Protists III

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,...

Diversity of Protists I

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...

Diversity of Protists IV

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

Trophic Levels

Trophic Levels

All organisms in an ecosystem occupy a trophic level in the food chain. The lowest level consists of primary producers, which synthesize their food from either solar or chemical energy. Each subsequent level obtains energy from the levels below. Detritivores can occupy any of the levels above primary producers.

Trophic Efficiency

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

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Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems

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Dinoflagellate and ciliate trophic modes database.

Erin L Jones¹, Susanne Menden-Deuer¹, Tatiana A Rynearson¹

¹Graduate School of Oceanography, University of Rhode Island, Narragansett, Rhode Island, USA.

Microbiology Resource Announcements

|June 10, 2025

Summary

This database details the feeding habits of dinoflagellate and ciliate protists. It highlights their vital roles in marine food webs and ocean ecosystems.

Keywords:

ciliate dinoflagellate trophic ecology

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Cultivation of the Marine Pelagic Tunicate Dolioletta gegenbauri Uljanin 1884 for Experimental Studies

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Published on: August 9, 2019

Area of Science:

Marine Ecology
Protistology
Food Web Dynamics

Background:

Dinoflagellates and ciliates are key microbial players in marine ecosystems.
Understanding their trophic interactions is essential for marine food web analysis.
Existing data on protist feeding is fragmented and requires synthesis.

Purpose of the Study:

To compile and synthesize available trophic data for dinoflagellate and ciliate taxa.
To create a comprehensive database of protist feeding relationships.
To emphasize the ecological significance of these protists in global marine food webs.

Main Methods:

Systematic literature review and data extraction.
Database construction integrating feeding observations and experimental data.
Taxonomic classification and standardization of trophic links.

Main Results:

A synthesized database of trophic interactions for numerous dinoflagellate and ciliate species.
Identification of key predator-prey relationships involving these protists.
Quantification of the contribution of dinoflagellates and ciliates to marine food webs.

Conclusions:

This database provides a foundational resource for marine food web research.
It underscores the critical ecological roles of dinoflagellates and ciliates globally.
Facilitates future research on protist ecology and their impact on ocean biogeochemical cycles.