Scientists examined the diversity of primary and secondary consumers from intertidal communities in four regions of the world:
Benguela along the coast of South Africa (BEN),
California along the coast of North America (CAL), Humboldt along the coast of Chile in
South America (HUM), and New Zealand (NZ). The number of organisms per square meter
(mean density), which is a unit that represents total biomass of primary consumers
(herbivores) and secondary consumers (carnivores), is plotted for each of these four regions
on the graph below.
Note: Image from Blanchette et al. (2009). Trophic structure and diversity in rocky intertidal
upwelling ecosystems: A comparison of community patterns across California, Chile, South
Africa and New Zealand. Progress in Oceanography 83: 107-116.
After examining the graph, complete the following sentence.
The black portion of each bar represents the percentage of [primary / secondary] consumers,
whereas the gray portion of each bar designates the percentage of [primary / secondary]
consumers from the four intertidal communities.
What will be an ideal response?
secondary; primary
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