TEACHING ALL VOLUMES SUBMIT WORK SEARCH TIEE
VOLUME 1: Table of Contents TEACHING ISSUES AND EXPERIMENTS IN ECOLOGY
Issues : Figure Sets

Figure Set 4: What is the ecology and biology of Pfiesteria?

Purpose: Help students better understand the ecotoxicological effects of nitrogen loading to estuaries.
Teaching Approach: "jigsaw"
Cognitive Skills: (see Bloom's Taxonomy) — comprehension, interpretation, application, evaluation
Student Assessment: newspaper article

FIGURE SET 4


For help, see the essay "Helping Your Students to Interpret Figures and Tables."



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figure 4b

Figure 4B. Scanning electron micrographs of two common stages of Pfiesteria piscicada. (a) is toxic zoospore (diameter = 7-14 microns) and (b) amoeba that transformed from a toxic zoospore (cell length = 20-40 microns). Photos from NCSU Center for Applied Aquatic Ecology. From J. M. Burkholder and H. B. Glasgow, Jr. 2001. History of toxic Pfiesteria in North Carolina estuaries from 1991 to the present. BioScience 51: 827-841.

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figure 4c

Figure 4C. Relationship between life stages of Pfiesteria piscicada and presence or absence of fish. See legend on figure for more details. From J. M. Burkholder and H. B. Glasgow, Jr. 1997. Pfiesteria piscicada and other Pfiesteria-like dinoflagellates: Behavior, impacts, and environmental controls. Limnology and Oceanography 42: 1052-1075.

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figure 4d

Figure 4D. U.S. distribution of toxic strains of Pfiesteria (TOX-B cells are nontoxic to grown fish but sometimes have residual toxicity to sensitive larval stages of fish). From J. M. Burkholder and H. B. Glasgow, Jr. 2001. History of toxic Pfiesteria in North Carolina estuaries from 1991 to the present. BioScience 51: 827-841.

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figure 4e

Figure 4E. Cells (NTZs - nontoxic zoospores) of Pfiesteria-like dinoflagellate (look like cells grown in the laboratory) from a depth of 0.25m at 4 control sites and 4 wastewater discharge sites (within about 100m of discharge point) in the New River estuary, North Carolina. Histograms are averages + 1 standard deviation of 3 replicate samples taken at each site. From J. M. Burkholder and H. B. Glasgow, Jr. 1997. Pfiesteria piscicada and other Pfiesteria-like dinoflagellates: Behavior, impacts, and environmental controls. Limnology and Oceanography 42: 1052-1075.

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