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Habitat templet theory in ecology

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Mia Schwarz

on 11 May 2014

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Transcript of Habitat templet theory in ecology

Habitat templates in ecology
How to explain diversity?
Habitat Templates
Example of habitat template
Templet axes
Combining tactics
The major tactics
Selecting tactics
and trade-offs

1. physiological adaption
2. defense
3. food harvesting/somatic growth
4. reproductive activities
5. escape in time and space
- balance profit and disprofit (trade-offs)
- different tactics possible in the
same habitat (diversity)
- not "optimal" strategy possible (no super-organism)
graphical representation of habitat traits with two or more abiotic and up to one biotic ax, representing the key characteristics of the habitat environment
1. physical and biotic factors of habitat
2. traits of organisms
3. species pool
4. biotic interactions
1. Disturbance
2. Adversity
3. Biotic interaction
Habitat variation
Hypothesis: habitat conditions match traits in organisms
traits = Eigenschaften
- every organism has a specific amount of energy for investing in tactics

- the phylogenetic history defines possible adaptions

- every strategy influences other tactics (trade-offs)
Investment in physiological adaptation
An organismic or systemic response of an individual to a specific external stimulus in order to maintain homeostasis
Aquatic environment
2. tide/waves
3. fluctuation in temperature and oxygen
4. water chemistry
5. inundation or drying
6. pressure
fat accumulation vs. loss of agility
Investment in defense
metabolic costs
to produce defense

increased metabolic cost
for movement
reduce risk of predation
increase the
chance of mating (deer)
Investment in food
harvesting and somatic growth
Investment in
reproductive activities
Investment in escape
in time and space
foraging, harvesting
use of energy
- somatic growth (size)
- search for refuge
- defense
- migration
-reproduction activities
- "production" of offspring
reproduction =
1. finding mate
2. mating
3. production of viable offspring
(4. subsequent care)
(expected) brighter future
high risk of migration
Open Questions / tasks of the future
1. missing quantitative definition
2. more explicit modes for life-history strategy
3. more holistic studies
Disturbance ax
is defined as a discrete,
punctuated killing, displacement or
damaging of one or more individuals that directly creates an opportunity for new individuals to become established
- every disturbance pushes the
habitat along the axis
Adversity ax
is defined as habitat unfavourableness
- phylogenetic adaption
- cost for maintenance of normal homeostasis
- negative correlation between
adversity tolerance and competitive ability
Biotic interactions
- impact of biotic components on the environment
- not as predictable as biotic axes
- more in tropical, than in temperate climate
major trade offs
current reproduction vs
fitness/ condition
number/quality/fitness of offspring
future reproduction
based on Hildrew & Townsend
What is the use of that theory?
we need to know:
Hypothesis: habitat conditions match traits in organisms
Full transcript