lecture note 19 for BGYB50

57 views2 pages
19 Jul 2010
School
Course
LECTURE 19:
- Competition between cells, organisms, populations, and species can either be:
(a) direct (also known as contest or interference competition) or
(b) indirect (also known as resource or scramble competition)
- When individuals of the same species compete, we speak of intraspecific competition; if
individuals of different species compete, we call it interspecific
- Biological competition is defined by:
(a) the direct or indirectstruggle” for a limiting resource (e.g. space, food, sexual
partner),
(b) reduction of resource availability due to the activity of the competing organisms,
and
(c) mutual (!) impact upon growth, survival or fecundity (genetic fitness!), i.e. both
partners in a competition scenario are affected (a -/- interaction)
- Plants can engage in direct competition as well, e.g. through allelopathy, the production
of chemicals that inhibit the germination or growth of neighbouring plants (it is a form of
“chemical warfare; many allelopathically active chemicals are also of medicinal value)
- Competition also plays itself out at the cellular level
- For competition to become manifest, resources (most often space, food, or mating
partners) must be limiting
- Central to the understanding of competition, as to so many other things, is the concept
of ecological optima and tolerance limits of biological organisms: Because the majority
of organisms in a population in principlelike similar things (e.g. one type of food,
spaces with a certain temperature), organisms are forced to compete for the latter when
www.notesolution.com
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.