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13 Cards in this Set
- Front
- Back
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Define 'mixotroph' |
Single-celled protists (eukaryotes) with the ability to acquire nutrition through different sources (phago- and phototrophy) |
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Where do mixotrophs occur? |
They are ubiquitous; marine-fresh; tropics-polar |
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Where are mixotrophs dominant? |
In mature ecosystems (oligotrophic, temperate and polar summer waters) |
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What did non-constitutive mixotrophs evolve from? |
From phagotrophs due to food limitations and ingestion of phototrophs |
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What did constitutive mixotrophs evolve from? |
From phototrophs due to light and nutrition limitation |
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What is a type 1 classification of mixotroph? |
An 'ideal' mixotroph Balanced photo- and phagotrophy |
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What is a type 2 classification of mixotroph? |
A phagotrophic 'algae'; primarily phototrophy - DIN is low - Organic growth factor is limiting - Light is limiting |
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What is a type 3 classification of mixotroph? |
A photosynthetic 'protozoa'; primarily phagotrophic - Prey limiting - Supplements C nutrition |
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What is the functional classification of constitutive mixotrophs? |
Phototrophs that eat - Prey size varies - Harmful algal bloom - Threat to food security |
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What is the functional classification of non-constitutive mixotrophs? |
Phagotrophs that steal photosystems |
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What is a generalist non-constitutive mixotroph? |
Phototrophy provided by ingested prey |
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What is a specialist non-constitutive mixotroph? |
Kleptoplasts - partial integration of phototrophy Endosymbionts - symbiotic phototrophy |
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Flynn & Mitra, 2009 |
Mechanistic Adaptive Mixotroph Models - Physiological interactions internalised and fully integrated - Thus efficient; less need to void partially digested food - Less external nutrient cycling, showing potential advantage of mixotrophs |
