THE CYCLING OF
Matter Cycling in
Nutrient cycles or Biogeochemical
cycles, involved natural processes
that recycle nutrients in various
chemical forms in a cyclic manner
from the nonliving environment to
THE NITROGEN CYCLE
All life requires nitrogen-compounds,
e.g., proteins and nucleic acids.
Air, which is 79% nitrogen gas (N2), is
the major reservoir of nitrogen.
But most organisms cannot use nitrogen
in this form.
Plants must secure their nitrogen in
Polynesia/Micronesia Hot Spots
ECOSYSTEMS: Mangroves, Coastal wetlands, Tropical rainforests, and Savannas.
ENDEMIC PLANT: Degeneriaceae, endemic to Fiji and includes a single tree
species, Degeneria vitiensis, unique primitive characters.
1. Identify the problems facing the condors.
2. The article refers to the condors as carrion eaters, what do
you infer this to mean?
3. Use at least two ecological concepts from chapter 3
(Bioaccumulation and Biomagnification) to explai