Nouns: Definitions and Spelling Rules
Nouns are words that name a person, place, thing, or idea. This comprehensive guide covers common nouns, proper nouns, singular and plural nouns, rules for forming plural nouns, possessive nouns, and more. Learn about pluralization rules and irregular nouns. Enhance your understanding of nouns with examples and clear explanations.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
What is pondweed? Angiosperm (flowering plant) Indigenous Has long, ribbon-like leaves, and a rhizome with starch-filled tubers Also known as sago pondweed or fennel pondweed Scientific name is now Stuckenia pectinata, but used to be called Potamogeton pectinatus
Where does in grow? Restricted to shallow water (usually <3m), because of a need for light Prefers brackish water (5-15 ppt salinity) Responds positively to nutrients Grows rapidly (up to 2.5 ha per year) So Zandvlei is the perfect home!
Role in the ecosystem1 Dampens wave action Important food source for red-knobbed coots and fish (especially carp) Absorbs nutrients Competes with and limits growth of unicellular algae, so can help to prevent nuisance (potentially toxic) algal blooms, e.g. blue-greens (cyanobacteria) Clarifies water Nesting sites for coots
Role in the ecosystem2 Oxygenates the water when in active growth phase Provide attachment sites and /or habitat for filamentous algae and invertebrate species Important as a refuge and food source for indigenous fish species significant as Zandvlei is only functional estuary of any size within False Bay
Problems Restricts water flow therefore lessen scouring effect of floods Restricts boating Dies off at end of growing season, and then releases nutrients into water. Can then contribute to toxic algal blooms. Subsequent stagnation can then lead to oxygen deficiency (and therefore fish kills).
Because of the stresses placed upon the Zandvlei estuary, the pondweed has to be managed artificially ..
