Natural Selection - Types of Selection - Silvereye Case Study
12 important questions on Natural Selection - Types of Selection - Silvereye Case Study
What differences were observed in body size among Zosterops lateralis populations?
- Zosterops lateralis on South Island: Larger body size versus Tasmania and Chatham.
- North Island population smaller than its South Island source.
What captures variation in Zosterops lateralis populations?
- CV1: Variation in size
- CV2: Variation in shape
What was the relationship between morphological and genetic characteristics in Z. l. lateralis?
- No correlation found between morphological and genetic measures.
- Genetic and morphological indices showed no significant relationships.
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What can cause phenotypic differentiation between natural populations?
- Natural selection (adaptive evolution)
- Random microevolutionary processes
- Genetic drift
- Mutation
How is evolutionary differentiation shown in Z. l. lateralis populations?
What is a recurrent pattern observed in island silvereye forms?
- Morphological differentiation
- Old island forms larger than mainland
- Recent islands larger than source
What does the Zosteropidae family include?
- Most successful island colonizers
- Members of the silvereye species (Zosterops lateralis)
- Ancient invasions with distinct phenotypes
- Recently colonized populations
How do island silvereye populations compare to mainland forms?
- Island species are larger
- Significant morphological differences
- Differences also in recently colonized islands
How did researchers study island populations of Zosterops lateralis?
- Studied recent 170-year colonization events
- Compared differentiation patterns
- Used mistnets to catch birds
- Measured 12 morphological traits
What method reduced morphological traits into a smaller set in the study?
- Statistical technique used: Canonical Discriminant Analysis
- Reduced 12 variables into Canonical Variates
- Accounted for 90% morphological differences
What is significant about Z. l. lateralis on recent islands?
- Larger than Z. l. familiaris
- General larger body size
What opportunity does studying Zosterops lateralis offer?
- Study of adaptive vs. nonadaptive processes
- Showcases differentiation in a natural system
- Provides insight into evolutionary processes
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