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Speciation Rates

Speciation Rates

Primary Production

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.

Production Efficiency

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

Energy Budgets

Energy Budgets

Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...

Formation of Species

Formation of Species

Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.

Ecological Niches

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.

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Updated: Jul 2, 2025

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

A Low-Cost Method of Measuring the In Situ Primary Productivity of Periphyton Communities of Lentic Waters

Published on: December 16, 2022

Quasispecies productivity.

Esteban Domingo¹, Guenther Witzany²

¹Centro de Biología Molecular "Severo Ochoa" (CSIC-UAM), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain.

Die Naturwissenschaften

|February 19, 2024

Summary

This summary is machine-generated.

The quasispecies theory explains RNA virus evolution, highlighting variant production as novel ontological entities. This concept, quasispecies productivity, reframes our understanding of viral dynamics and our relationship with nature.

Keywords:

Consortial properties Early evolution Genetic innovation Mutation RNA networks Virus

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Last Updated: Jul 2, 2025

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Estimating Virus Production Rates in Aquatic Systems

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Published on: September 22, 2010

Area of Science:

Virology
Evolutionary Biology
Theoretical Biology

Background:

The quasispecies theory is crucial for understanding RNA virus evolution and disease control.
Recent adaptations incorporate non-deterministic mutagenesis and diverse behavioral motifs like cooperation and competition.
The consortial structure, with memory genomes in minority populations, offers a better fit than the master sequence model.

Purpose of the Study:

To re-evaluate the quasispecies theory in light of new empirical data.
To propose 'quasispecies productivity' as a new paradigm.
To redefine the ontological status of viral variants.

Main Methods:

Conceptual analysis and synthesis of existing empirical data.
Theoretical integration of non-deterministic mutagenesis and behavioral motifs.
Reinterpretation of viral variant generation within the quasispecies framework.

Main Results:

Quasispecies variants are unique ontological entities, not mere error copies.
High variant production, termed 'quasispecies productivity,' is a key characteristic.
The consortial model better explains empirical observations than the master sequence concept.

Conclusions:

Quasispecies productivity offers a more accurate narrative than error-replication.
This reframing impacts our understanding of viral evolution and disease.
It suggests a new perspective on the human-nature relationship in the 21st century.