for the Northeast By Rachael Brown Sonya Carlson and Diana Jackson Under the guidance of Dr Alan Baker NEXT Introduction This photographic key is intended to aid in identification of freshwater algae to the Genus level Proceed through this key by clicking on the picture that most resem ID: 273544
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Slide1
Freshwater Phytoplankton Keyfor the Northeast
By: Rachael Brown, Sonya Carlson, and Diana Jackson Under the guidance of Dr. Alan Baker
NEXTSlide2
Introduction:
This photographic key is intended to aid in identification of freshwater algae to the Genus level. Proceed through this key by clicking on the picture that most resembles your organism.
Buttons to know:
Home: Go to the beginning page at any time
Back: Go to the last page viewed
Forward: Go to the next page in the key
To Start Key Click Here
STARTSlide3
Cells with definite chloroplasts and nuclei, not blue-green in color
Cells without definite chloroplasts and nuclei, blue-green in colorSlide4
Vegetative cells usually grass-green in color and with a definite cell wall
Vegetative cells not grass-greenSlide5
Vegetative cells yellowish to brown with a glass-like silica wall of two overlapping halves
Vegetative cells yellow-green with a cell wallSlide6
Class: Chrysophyceae
Class Under ConstructionSlide7
Class: Cyanophyceae
Common Name: Cyanobacteria, blue-greens
Continue to GenusSlide8
Rectangular
Is the general contour of the specimen
:
Elongate strands of cells
Oblong, Circular, or Globular
Sperm shaped
Note:
A filament is a strand of cells arranged end to endSlide9
Are the filaments:
Unbranched
Branched
Elongate filaments of cellsSlide10
Genus:
MicrothamnionSlide11
Filaments are
found alone
Unbranched:
Filaments form together
in parallel colonies (rafts)Slide12
Option A: Oblong
Option B: Circular
Option C: Globular
Oblong, Circular, or GlobularSlide13
Head has thin membrane
Head has thick wavy membrane
Sperm-ShapedSlide14
Genus
:
AphanocapsaSlide15
Genus:
AphanotheceSlide16
Genus:
ChroococcusSlide17
Genus:
CoelosphaeriumSlide18
Genus:
GloeocapsaSlide19
Genus:
MicrocystisSlide20
Genus:
MerismopediaSlide21
Genus:
CylindrospermumSlide22
Genus:
GloeotrichiaSlide23
Genus:
AnabaenaSlide24
Genus:
AphanizomenonSlide25
Genus:
CalothrixSlide26
Genus:
Chamaesiphon Slide27
Genus:
LyngbyaSlide28
Genus:
NostocSlide29
Genus:
OscillatoriaSlide30
Filaments are joined at one end
Filaments are parallel and are not joined together at any endSlide31
Filaments have elongate cells arranged end to end
Filaments have horizontal cells that are stacked on top of each otherSlide32
Filaments Found Alone
Cells are round and are arranged in long filaments (like strands of pearls)
Elongate unicells are found on a substrate
unicellsSlide33
Cell shape is rectangular
Cell shape is oblongSlide34
Filaments are spaced apart from each other
Filaments are lumped togetherSlide35
Option A: Oblong
Cells float freely apart from each other
Cells join in even numbers and have a clear membrane around themSlide36
Option B: Circular
Cells are free floating with thin clear membranes
Cells are congregated and encased in a round membraneSlide37
Encased Cells
Cells are encased by a clear membrane
Cells are encased in a thick green membraneSlide38
Order: BacillariophyceaeCommon Name:Diatoms
Continue to GenusSlide39
Is the shape of the organism rectangular?
Is the shape of the organism circular or oval?
Does organism have stalks?Slide40
Are there many rectangles joined together?
Are the rectangles separate from each other?Slide41
Do the rectangles make a line or stairstep formation?
Do the rectangles form a star?
Do the rectangles form a box?Slide42
Genus: TabellariaSlide43
Genus:
AsterionellaSlide44
Genus: EunotiaSlide45
Width (W) of individual cells is 1/10 of the length (L)
W
L
W
L
Width (W) of individual cells
is 1/5 of the length (L)Slide46
Genus: FragilariaSlide47
Genus: FragilariaSlide48
Are there many small circles within the cells?
Is the end of the cell a long spike or is there a few large circles within the cells?Slide49
Genus: MelosiraSlide50
Genus: RhizosoleniaSlide51
Is the middle of the cell wider than either end?
Is the end of the cell opposite of the stalk the widest section?Slide52
Genus: CymbellaSlide53
Genus: GomphonemaSlide54
Are there smaller circles within the large circle?
Are there lines around the edge of the circle?
Is the shape of the organism oval?Slide55
Genus: CocconeisSlide56
Genus: CyclotellaSlide57
W
L
Is the cell extremely long and skinny with the length (
L
) more than 15 times as much the width (
W
)?
W
L
Is the cell extremely long and skinny with the length (
L
) more than 15 times as much the width (
W
)?Slide58
Genus: SynedraSlide59
r
Are the ends of the cell pointed (
p
) or
rounded (
r
) )?
Are the ends of the cell curved (
c
)?
Are the ends of the cell flat (
f
)?
f
c
pSlide60
Genus: GyrosigmaSlide61
Genus: AmphoraSlide62
Is the cell the same width in the
middle as it is nearer to the ends?(a is equal to b)
Is the cell the wider in the
middle than it is nearer to the ends?
(
a
is larger than
b
)
b
a
b
aSlide63
Is the edge of the oval smooth?
Does the edge of the oval have a distinct bump?
Bump
SmoothSlide64
Is there a distinct line down the length of the cell?
Distinct
Line
Is no distinct line visible in the center of the cell?Slide65
Is the center area of the middle line is wider than the ends of the middle line with a distinct break in the center?
Is the middle line even in width with a distinct break in the center?
Is the middle line complete with no distinct break in the center? Slide66
Genus: Navicula Slide67
Genus: FrustuliaSlide68
Genus: OpephoraSlide69
Is the cell long and skinny with the length (
L) more than 5 times as much the width (W)?
W
L
Is the cell short with the length (
L
) less than 5 times as much the width (
W
)?
W
LSlide70
Genus: DiatomaSlide71
Genus: AmphipleuraSlide72
Genus: SurirellaSlide73
Are there distinct parallel lines extending from the middle of the cell to the edge?
Is the interior of the cell a homogenous color without lines?
LinesSlide74
Genus: AchnanthesSlide75
Genus: RhopalodiaSlide76
Are the ends distinctly pointed?
Are the ends distinctly rounded?Slide77
Genus: NitzschiaSlide78
Genus: Pinnularia Slide79
ActinastrumSlide80
AnkistrodesmusSlide81
ApiocystisSlide82
ArthrodesmusSlide83
BulbochaeteSlide84
CarteriaSlide85
CentritractusSlide86
ChaetophoraSlide87
ChaetosphaeridiumSlide88
CharaciopsisSlide89
CharaciumSlide90
ChlamydomonasSlide91
ChlorellaSlide92
ChlorococcumSlide93
CladophoraSlide94
ClosteriumSlide95
CoelastrumSlide96
CoelosphaeriumSlide97
ColeochaeteSlide98
CosmariumSlide99
CrucigeniaSlide100
DesmidiumSlide101
DictyosphaeriumSlide102
DimorphococcusSlide103
DocidiumSlide104
EuastrumSlide105
EudorinaSlide106
GloeocystisSlide107
GoniumSlide108
HaematococcusSlide109
HormidiumSlide110
HyalothecaSlide111
HydrodictyonSlide112
KirchneriellaSlide113
MicractiniumSlide114
MicrasteriasSlide115
MicrosporaSlide116
(Conjugating)
MougeotiaSlide117
OedogoniumSlide118
OnychonemaSlide119
OocystisSlide120
PalmellaSlide121
PalmellocystisSlide122
PandorinaSlide123
PediastrumSlide124
PlanktosphaeriaSlide125
PleurotaeniumSlide126
ScenedesmusSlide127
SelenastrumSlide128
SpirogyraSlide129
StaurodesmusSlide130
TetraedronSlide131
UlothrixSlide132
VolvoxSlide133
XanthidiumSlide134
ZoochlorellaSlide135
ZygnemaSlide136
COLONIES (GROUPS OF CELLS)
FILAMENTS (LINEARLY)
CELLS ARE ARRANGED IN…
SINGLE CELLS
Class: ChlorophycaeSlide137
COLONIES ARE…
FLAT (2-D)
SPHERICAL (3-D)Slide138
CELLS IN FILAMENTS HAVE…
ONE CHLOROPLAST
TWO CHLOROPLASTS
MANY CHLOROPLASTSSlide139
SINGLE CELLS ARE…
UNICELLULAR
HEMISPHERESSlide140
INDIVIDUAL CELL SHAPE IS…
SPHERICAL OR ELLIPTICAL
LONG OR ROD SHAPED
SPIKEYSlide141
COLONIES HAVE…
TIGHTLY PACKED CELLS
SPACE BETWEEN CELLSSlide142
FILAMENTS ARE…
SINGULAR
BRANCHEDSlide143
HEMICELLS ARE…
LONG AND NARROW
SEMICIRCULARSlide144
CHLOROPLASTS ARE…
CLUMPED
SPIRALEDSlide145
ARE CELLS IN THE FILIMENT…
SHORT
LONGSlide146
Does your algae look like any of these?Slide147
Does your algae look like any of these?Slide148
Does your algae look like any of these?Slide149
Does your algae look like any of these?Slide150
Does your algae look like any of these?