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Related Concept Videos

Responses to Salt Stress02:02

Responses to Salt Stress

Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
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When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
Transduction01:16

Transduction

Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...
Transcription01:10

Transcription

Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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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...

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Related Experiment Video

Updated: May 8, 2026

Adaptation at the Extremes of Life: Experimental Evolution with the Extremophile Archaeon Sulfolobus acidocaldarius
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Evolution of salinity tolerance from transcriptome to physiological system.

Graham R Scott1, Kevin V Brix

  • 1Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada. scottg2@mcmaster.ca

Molecular Ecology
|September 5, 2013
PubMed
Summary

Common physiological and genomic mechanisms drive salinity tolerance divergence in killifish across microevolutionary and macroevolutionary scales. These adaptive changes in ion transport and gene expression allow niche expansion into freshwater environments.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Physiology

Background:

  • Understanding the link between microevolution and macroevolution is crucial in evolutionary biology.
  • Genomic and physiological approaches are powerful tools for studying evolutionary divergence mechanisms.

Purpose of the Study:

  • To investigate common physiological and genomic mechanisms underlying salinity tolerance divergence in killifish.
  • To compare adaptive divergence across micro- and macroevolutionary timescales.

Main Methods:

  • Comparative analysis of two killifish species (Fundulus majalis and Fundulus heteroclitus) with different salinity tolerances.
  • Examination of ion-transporting epithelium structure and gill transcriptome responses to osmotic challenges.
  • Assessment of inter-specific and intra-specific variation in osmotic niche adaptation.

Main Results:

  • Fundulus species exhibit striking differences in gill ion transport and gene expression related to osmotic challenge.
  • Inter-specific differences in salinity tolerance mechanisms mirror, but are more pronounced than, intra-specific variations.
  • The same functional adjustments appear to facilitate niche expansion from brackish to freshwater environments.

Conclusions:

  • Common physiological and genomic mechanisms contribute to adaptive divergence in salinity tolerance at both micro- and macroevolutionary levels.
  • The study highlights how population-level adaptive divergence can scale up to generate species-level differences.
  • This research emphasizes the continuity of evolutionary processes across different timescales.