STP1179

    Effects of Acidic Growth Conditions on Systematic Characters in the Conjugating Green Algae (Zygnemataceae, Chlorophyta)

    Published: Jan 1993


      Format Pages Price  
    PDF (364K) 9 $25   ADD TO CART
    Complete Source PDF (8.0M) 9 $101   ADD TO CART


    Abstract

    Many years of acid rain have caused countless lakes throughout the world to reach a pH too low to support any animal life and often only limited types of plant life. In this report, a new acidic algal culture medium, KC-1, was developed to simulate acid lake conditions in the laboratory. This medium has the ability to maintain a pH in the range 4.0 to 5.5 by the use of ammonium sulfate (NH4)2SO4 as its primary buffer. Three filamentous strains from two genera of the green algal family Zygnemataceae (Spirogyra communis and Mougeotia transeaui) were grown in KC-1 medium to observe their morphology at low pH levels (range 4.0 to 5.5). Morphology differed markedly for all three strains, when compared to morphology of these same strains that had been maintained in nonacidic culture for up to 30 years. Differences included variations in cell width, cell length, and the structure of cell walls and the chloroplasts. These characters are critically important in species-level taxonomy, which may be complicated by effects of acid rain on phenotype.

    Keywords:

    zygnematacean algae, acid rain, KC-1 acidic medium, acid lake simulation in laboratory


    Author Information:

    Clayton, KL
    University of Arizona, Tucson, AZ

    Hoshaw, RW
    University of Arizona, Tucson, AZ

    McCourt, RM
    DePaul University, Chicago, IL


    Paper ID: STP19237S

    Committee/Subcommittee: E47.04

    DOI: 10.1520/STP19237S


    CrossRef ASTM International is a member of CrossRef.