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Related Concept Videos

Freshwater Microbial Ecology01:24

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...
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Diversity of Protists IV01:27

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...
Marine Microbial Ecology01:30

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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...
Diversity of Protists II01:27

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 III01:27

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,...

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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems
07:41

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Published on: July 30, 2019

Large-scale biodiversity patterns in freshwater phytoplankton.

Maayke Stomp1, Jef Huisman, Gary G Mittelbach

  • 1Kellogg Biological Station, Department of Plant Biology, Michigan State University, Hickory Corners, Michigan 49060, USA.

Ecology
|December 15, 2011
PubMed
Summary

Freshwater phytoplankton diversity shows significant geographic variation, with richness influenced by local environmental factors like chlorophyll, lake size, and temperature. These findings highlight the impact of land use and climate change on aquatic microbial biodiversity.

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Area of Science:

  • Ecology
  • Limnology
  • Microbial Biogeography

Background:

  • Global biodiversity patterns exhibit clear gradients, with high species richness in tropics and lower richness in polar/alpine regions.
  • While macroorganism patterns are well-studied, the large-scale biogeographical distribution of freshwater phytoplankton diversity remains largely unknown.
  • Recent studies suggest microorganisms may also display significant geographic variation in biodiversity.

Purpose of the Study:

  • To investigate the large-scale biogeographical distribution of freshwater phytoplankton species diversity across the continental United States.
  • To identify the key drivers of observed phytoplankton biodiversity gradients.
  • To understand the relationship between local environmental factors and large-scale diversity patterns.

Main Methods:

  • Phytoplankton species diversity was assessed in samples from 540 lakes and reservoirs across the continental United States.
  • Latitudinal, longitudinal, and altitudinal gradients in phytoplankton biodiversity were analyzed.
  • Structural equation models were employed to determine the influence of local environmental factors and geographic coordinates on diversity.

Main Results:

  • Strong latitudinal, longitudinal, and altitudinal gradients in freshwater phytoplankton biodiversity were identified.
  • Phytoplankton species richness was positively correlated with lake chlorophyll a concentration, lake surface area, and water temperature.
  • Local environmental factors, which varied geographically, were the primary drivers of these large-scale biodiversity gradients, with residual direct effects from latitude, longitude, and altitude.

Conclusions:

  • Freshwater phytoplankton exhibit substantial geographic variation in biodiversity, mirroring patterns seen in macroorganisms.
  • Local environmental factors, influenced by geographic position, are key determinants of phytoplankton diversity.
  • Changes in land use and climate are likely to significantly impact freshwater phytoplankton biodiversity patterns through alterations in local environmental conditions.