WA’AHILA RIDGE TRIP II:
1 LITER OF WATER!
Clothes that can get dirty
Closed toed shoes
Maps of your group’s sub-plots from Lab 5
Climate, season, and weather affect the
distribution and activities of both terrestrial and
refers to the general
prevailing atmospheric conditions over the years
in a given region.
humidity, precipitation, and solar irradiance
usually characterize climate.
refers to the momentary conditions of the
atmosphere. Climates are often broadly
categorized by latitude.
Examples of major
climate types include arctic, temperate, and
tropical. Climate is important in determining the
general type of ecological community, or
that will be found across a broad area. Major
biome types include tropical rainforest, savanna,
desert, and tundra.
basic concepts with which you should already be
Consult your ecology text for more
information on the importance of temperature and
precipitation in determining the distribution of
refers to the amount of gaseous water
in the air.
Humidity is important because it
directly affects the water loss in animals and
plants. For example, most centipedes quickly
become dehydrated in low humidity
environments, dying in a matter of hours.
Likewise, low humidity conditions may force
some plants to close their stomata, reducing
photosynthesis and growth.
Although a high
humidity environment may seem ideal for life
since dehydration is less of a problem, high
humidity environments also pose challenges for
many organisms. For example, persistent high
humidity conditions can promote the growth of
pathogenic microorganisms like fungi, killing
certain plants or animals.
refers to the density and
intensity of photons (light) from the sun.
irradiance is highest at the equator, and decreases
as you approach the poles of the Earth.
this trend, many other factors affect an organism's
exposure to solar irradiance. A population may be
located near the equator, but if it is located under
a thick canopy of vegetation, then its exposure
will be greatly reduced.
In aquatic environments,
irradiance is reduced with increasing water depth.
Like humans, many animals and plants can be
“sunburned” if exposed to excessive solar
radiation. However, some plants are adapted to
grow extremely quickly under intense sunlight
(e.g. corn). Heat generated by irradiance promotes
dehydration, so organisms that are regularly
exposed to high irradiance must have a
dependable water supply or have adaptations to