VOLUME 1: Table of Contents
TEACHING ISSUES AND EXPERIMENTS IN ECOLOGY
TEACHING
ALL VOLUMES
SUBMIT WORK
SEARCH
Figure Set 2: Evidence for Nitrogen Limitation in the Ocean
Purpose: To help students understand why nutrient loading can cause algal blooms.
Teaching Approach: "Guided Class Discussion starting with first principles"
Cognitive Skills: (see
Bloom's Taxonomy) — knowledge, comprehension, interpretation, application, synthesis
Student Assessment: essay quiz
FIGURE SET 2
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Figure 2. Change in chlorophyll (micrograms per liter) in coastal seawater in 4
treatments (Nitrogen and phosphorus together, N alone, P alone, and Control
with no addition) over 6 days. (From Vince, S. and I. Valiela. 1973. The effects
of ammonium and phosphate enrichment on chlorophyll a, pigment ratio, and
species composition of phytoplankton of Vineyard Sound. Marine Biology 56:
111-134).
Students need to understand what nutrient limitation is in order to follow the hypothesis that nutrient enrichment of the Florida Keys waters results in loss of seagrass beds and corals. The questions in the Student Instructions section will help you logically develop their understanding of this concept.
For help, see the essay "Helping Your Students to Interpret Figures and Tables."
Figure 2. Change in chlorophyll (micrograms per liter) in coastal seawater in 4 treatments (Nitrogen and phosphorus together, N alone, P alone, and Control with no addition) over 6 days. (From Vince, S. and I. Valiela. 1973. The effects of ammonium and phosphate enrichment on chlorophyll a, pigment ratio, and species composition of phytoplankton of Vineyard Sound. Marine Biology 56: 111-134).
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