in northern Portugal (data from L.S.W. Tera). Pollution of streams, on the other hand, reduces the diversity of Trichoptera and several other groups of stream insects, reducing both species richness and species diversity. Interpret why those happened.

in northern Portugal (data from L.S.W. Tera). Pollution of streams, on the other hand, reduces the diversity of Trichoptera and several other groups of stream insects, reducing both species richness and species diversity. Interpret why those happened.

Aquaculture Science

3rd Edition

ISBN:9781133558347

Author:Parker

Publisher:Parker

Chapter2: Aquatic Plants And Animals

Section: Chapter Questions

Problem 3KA

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Question

Ecologists use a rank-abundance curve to display relative species
abundance, which is a component of biodiversity. It can also be used to
demonstrate species richness and evenness. Figure 1 shows the rank-
abundance curve for caddisflies (Order Trichoptera) of two aquatic habitats
in northern Portugal (data from L.S.W. Tera). Pollution of streams, on the
other hand, reduces the diversity of Trichoptera and several other groups of
stream insects, reducing both species richness and species diversity.
Interpret why those happened.
These rank-abundance curves show
that the mountain stream caddisfly
community has higher species
richness and greater species evenness.
0.1 -
Mountain stream
0.01
Greater richness
and species evenness
0,001
Coastal ponds
0.0001
20
40
60
80
Abundance rank
Figure 1: Rank-abundance curve for caddisflies (Order Trichoptera) of two
aquatic habitats in northern Portugal (data from L.S.W. Tera).
Proportional abundance

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