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Class Notes - Animal Ecology (NWI-BB060B)

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Summary of all classes needed for the Animal Ecology Exam, with the inclusion of the four tutorials given

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  • 15 juni 2022
  • 16 juni 2022
  • 55
  • 2021/2022
  • College aantekeningen
  • Prof. h. siepel
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Animal Ecology: Lecture notes (2021/2022)




Faculty of Science, Radboud University


NWI-BB060B: Animal Ecology


Prof. H. Siepel


Second semester 2021/2022

,List of contents:
Animal Ecology: The basis (Lecture 1)....................................................................................................3
Variation in the environment and Life histories (Lecture 2)..................................................................5
Feeding guilds, specialists, and generalists (Lecture 3)..........................................................................8
Herbivory (Lecture 4)...........................................................................................................................12
Predation (Lecture 5)...........................................................................................................................14
Parasitoids (Lecture 6).........................................................................................................................20
Parasitism (Lecture 7)..........................................................................................................................22
Commensalism and Mutualism (Lecture 8).........................................................................................24
Detritivory (Lecture 9).........................................................................................................................26
Nutrition in Animal Ecology (Lecture 10).............................................................................................28
Trade-offs and Bet-hedging (Lecture 11).............................................................................................30
Reproduction forms (Lecture 12).........................................................................................................33
Summary - Reproduction forms.......................................................................................................35
Sex and Gender (Lecture 13)...............................................................................................................37
Sex differences (Lecture 14)................................................................................................................40
Per capita investment (Lecture 15)......................................................................................................42
Development and longevity (Lecture 16).............................................................................................45
Synchronization (Lecture 17)...............................................................................................................47
Dispersal (Lecture 18)..........................................................................................................................49
Tutorial 1: Optimal foraging – Diet width............................................................................................51
Tutorial 2: Modelling parasite virulence..............................................................................................52
Tutorial 3: Behavioural interactions.....................................................................................................53
Tutorial 4: Reproductive strategies......................................................................................................55

,Animal Ecology: The basis (Lecture 1)
Basic principles of species:
All individuals show the following characteristics:
1. Individuals consume (Feeding)
2. Individuals evade predation (Survive)
3. Individuals grow/develop/learn (Adjust)
4. Individuals reproduce (Replicate)



Variation:
“Ecology is the battlefield of competing variations of traits”

Species fitness is increased with (genomic and/or phenotypical) variation

Variation is limited by the building plan (only existing structures can be modified or added on to)

Types of variation:

 Tolerance [basic physiology]
 Learning [behavioural aspects]
 Phenotypic plasticity [reaction norms*]
 Genetic variation [quantitative genetics**]

* Describes the pattern of phenotypic expression of a single genotype across a range of environments
** Phenotypes that vary continuously as opposed to discretely identifiable phenotypes and gene-products



Trade-offs:

“An individual’s traits are dependent on its environment”

Investing in a trait has a cost (Currency: fitness expressed as the expenditure of energy)

Variation between traits between individuals always comes with trade-offs.

 (e.g. Energy spent on defensive adaptations cannot be spent on growth)



Lineage specific effects:

“Variability is limited by the construction plan of taxa”

 (e.g. snakes always lay eggs (Oviparous), the European viper (Vipera berus) is birth alive by
hatching eggs inside of the mother)

, Summary:
 Eat; not being eaten, Grow, develop, learn and reproduce
 Anything with energy stored, will be utilized sooner or later
 Variation is self-perpetuating
 Limitation of the building plan vs. forces adaptation
 The balance between income (food) and expenditure (life-history traits)
 Phenotypical plasticity, reaction norm and genetical basis

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