Economic Importance of Bryophytes - Evolution of Plants - Lecture Slides, Slides for Evolution. Shree Ram Swarup College of Engineering & Management

Evolution

Description: Economic Importance of Bryophytes, Liverworts and Hornworts, Glomeromycota, Sphagnidae, Sphagnum Dressings, Important in Hydrodynamics, Bog Formation, Sphagnum Ion-Exchange Mechanism are the important key points of lecture slides of Evolution of Plants.
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Economic Importance of Bryophytes
I. Liverworts and hornworts: not much! (but many contain N-
fixing cyanobacteria, important in ecosystem nutrient
availability; some are mycorrhizal with Glomeromycota)
II. SPHAGNIDAE: "economic" importance
1. Important in hydrodynamics of large areas of especially
northern hemisphere - bogs and “muskeg.
2. Sphagnum dressings, in medicine, shoes and diapers
III. Other mosses, various other uses
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BOG FORMATION
a) open pond, slow-moving stream: margins with
floating aquatics, especially Carex spp. with roots
anchored in Sphagnum
b) Sphagnum builds above (growth) and below
(death and deposition) water-line; enables margin to
grow inwards
c) increased Sphagnum growth allows colonization
of mat by bog shrubs, and eventually conifers such as
black spruce & tamarack
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Bog Formation II
d) continued encroachment of water surface by floating bog
mat may eventually cover surface if disturbance is slight. Waves
or stream-flow erode edges
e) amelioration of water table by increased Sphagnum mat
away from water-line allows development of forest; hummocks
may have white pine or white birch
f) in permafrost areas, forest lowers summer temperature of
forest floor, permafrost moves upward, water is trapped, and
trees are drowned, so open Sphagnum bog cycles with forest
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SPHAGNUM ION-EXCHANGE
MECHANISM
Metal2+ + 2HA ---> MA+ + A- + 2H+
Gives off H+, lowering pH and eliminating
competing mosses (and many vascular
plants)
Metal ions can be displaced by shaking in
H+ (e.g., dilute HCl) to assay metal content
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University: Shree Ram Swarup College of Engineering & Management
Subject: Evolution
Upload date: 02/01/2013
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