Presentation on theme: "Freshwater Phytoplankton Key for the Northeast By: Rachael Brown, Sonya Carlson, and Diana Jackson Under the guidance of Dr. Alan Baker NEXT."— Presentation transcript:
Freshwater Phytoplankton Key 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 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 START
Cells with definite chloroplasts and nuclei, not blue-green in color Cells without definite chloroplasts and nuclei, blue-green in color
Vegetative cells usually grass-green in color and with a definite cell wall Vegetative cells not grass-green
Vegetative cells yellowish to brown with a glass-like silica wall of two overlapping halves Vegetative cells yellow-green with a cell wall
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)
Is the edge of the oval smooth? Does the edge of the oval have a distinct bump? Bump Smooth
Is there a distinct line down the length of the cell? Distinct Line Is no distinct line visible in the center of the cell?
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?