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Lecture 21

BIOL 1F90 Lecture Notes - Lecture 21: Periphyton, Monophyly


Department
Biological Sciences
Course Code
BIOL 1F90
Professor
Fiona Hunter
Lecture
21

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BIOL1F90
Feb.29th,2016
BiodiversityofProtists
Whatareprotists?
Artificialgrouping!
Eukaryotesthatarenotclassifiedintheplant,animal,orfungalkingdoms,thoughsome
protistsarecloselyrelatedtoplantsoranimalsorfungi
twocommoncharacteristics
mostabundantinmoisthabitats
mostofthemaremicroscopicinsize
ClassifiedbyEcologicalRole
threemajorecologicalgroupings 
algae–generallyphotoautotrophic
protozoa–heterotrophic
funguslike–resemblefungiinbodyformandabsorptivenutrition
exampleofconvergentevolution
termslacktaxonomicorevolutionarymeaning
ClassifiedbyHabitat
particularlycommonanddiverseinoceans,lakes,wetlandsandrivers
plankton–swimmingorfloating
phytoplankton–photosynthetic
protozoanplankton–heterotrophic
occurprimarilyassinglecells,coloniesorshortfilaments
periphyton
attachedbymucilagetounderwatersurfaces
producemulticellularbodies
seaweedsormacroalgae
ClassifiedbyMotility
swimusingeukaryoticflagella
flagellates
someflagellatedreproductivecells
cilia–shorterandmoreabundantthanflagella
ciliates
amoeboidmovement–usingpseudopodia
amoebae
glidingonproteinorcarbohydrateslime
EvolutionandRelationships
atonetime,protistswereinasinglekingdom
notmonophyletic
somerelationshipsuncertainordisputed
newprotistsbeingdiscovered;ongoingresearch
nowbeingclassifiedintosupergroups
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