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Related Concept Videos

Speciation Rates01:07

Speciation Rates

Speciation can proceed at markedly different rates, and evolutionary biologists commonly describe these differences through the models of gradualism and punctuated equilibrium. Both patterns explain how new species arise, but they differ in the tempo and continuity of evolutionary change. In both cases, evolutionary change arises from heritable variation within populations, with natural selection often shaping traits that improve survival and reproduction under specific environmental conditions.
Formation of Species01:31

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.Allopatric SpeciationIn allopatric speciation, gene flow between two populations of the same species is prevented by a geographic barrier, like...
Acid Mine Drainage01:19

Acid Mine Drainage

Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
Osmoregulation in Fishes02:32

Osmoregulation in Fishes

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?
Genetics of Speciation02:16

Genetics of Speciation

Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.The genetics of speciation involves the different traits or isolating mechanisms preventing gene exchange, leading to reproductive isolation. Reproductive isolation can be due to reproductive barriers that have effects either before or after the formation of a zygote. Pre-zygotic mechanisms prevent fertilization from occurring, and post-zygotic mechanisms...

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Related Experiment Video

Updated: Jun 28, 2026

A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging
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A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

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Arsenic speciation patterns in freshwater fish.

Zdenka Slejkovec1, Zlatka Bajc, Darinka Z Doganoc

  • 1Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.

Talanta
|October 31, 2008
PubMed
Summary

Arsenic speciation in 16 freshwater fish revealed distinct patterns. Salmonids primarily contained arsenobetaine (AsB), while burbot showed high dimethylarsinic acid (DMAA), indicating family-specific arsenic profiles.

Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Marine Biology

Background:

  • Arsenic is a toxic element found in aquatic environments.
  • Understanding arsenic speciation in fish is crucial for food safety and ecological risk assessment.
  • Different fish species may accumulate and metabolize arsenic differently.

Purpose of the Study:

  • To analyze arsenic species in the muscle tissue of various freshwater fish species.
  • To identify the predominant arsenic compounds in different fish families.
  • To investigate potential correlations between fish taxonomy and arsenic speciation patterns.

Main Methods:

  • High-performance liquid chromatography (HPLC) with anion and cation exchange separation.
  • On-line UV-decomposition, hydride generation, and atomic fluorescence detection (AFS).

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  • Cluster analysis to evaluate relationships between fish families and arsenic speciation.

    • Main Results:

    • Arsenobetaine (AsB) was the dominant arsenic species (92-100%) in salmonids.
    • Dimethylarsinic acid (DMAA) constituted 75% of extractable arsenic in burbot.
    • Other species showed varying concentrations of AsB, DMAA, arsenite (As(III)), and trimethylarsine oxide (TMAO), with an unknown cationic compound present in most non-salmonid samples.
    • Cluster analysis indicated a distinct arsenic speciation pattern for salmonids, separating them from other fish families.

    Conclusions:

    • Fish family is a significant factor influencing arsenic speciation in muscle tissue.
    • Salmonids exhibit a unique arsenic profile dominated by arsenobetaine.
    • Further research is needed to identify the unknown cationic arsenic compound and fully elucidate arsenic metabolism in diverse fish species.