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Diversity of Protists II

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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...

Microbial Classification System

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Classification is the process of organizing organisms into hierarchically inclusive groups based on their phenotypic similarities or evolutionary relationships. A species comprises one or more strains, and closely related species are grouped into genera. Genera are further classified into families, families into orders, orders into classes, and so forth, up to the domain level, which is the broadest taxonomic rank derived from a combination of phenotypic and genotypic data.The nomenclature of...

Diversity of Protists IV

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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...

Diversity of Protists III

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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,...

Diversity of Protists I

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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...

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Understanding divergences between ecological status classification systems based on diatoms.

Lorena González-Paz¹, Cristina Delgado¹, Isabel Pardo¹

¹Department of Ecology and Animal Biology, University of Vigo, Vigo, Spain.

The Science of the Total Environment

|May 28, 2020

Summary

Comparing diatom-based water quality assessment methods reveals multimetric indices are more sensitive than IPS. Regional auto-ecological studies are crucial before adopting non-regional diatom indices.

Keywords:

Bioassessment Diatoms Indicator Phosphate Rivers TITAN

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Area of Science:

Ecology
Environmental Science
Biomonitoring

Background:

Numerous diatom-based classification systems exist for river water quality assessment.
Limited knowledge exists on divergences when applying different systems within the same region.

Purpose of the Study:

To compare ecological status classifications from conceptually different diatom-based methods.
To evaluate the sensitivity of multimetric indices versus the Specific Polluosensitivity Index (IPS).

Main Methods:

Collected 402 monitoring samples from Atlantic and Mediterranean streams.
Calculated two regional multimetric indices (MDIAT, DIATMIB) and IPS.
Utilized distance-based redundancy analyses (dbRDA) and Threshold Indicator Taxa ANalysis (TITAN).

Main Results:

Multimetric indices showed higher sensitivity to degradation than IPS, incorporating diatom abundance and regional reference communities.
dbRDA identified alteration gradients related to nutrient enrichment and organic loads.
TITAN analysis suggested lower phosphate thresholds and higher classification boundaries for MDIAT and IPS.

Conclusions:

Regional diatom auto-ecology studies are essential before adopting non-regional indices.
Diatom community structure reflects environmental gradients, particularly nutrient and organic pollution.
Methodological choices in diatom-based biomonitoring impact ecological status classification.