Chlorophyll a Analysis

1
Visual Sampling of Fishes
2
Strip Transect (SST)
Deploy transect line Record species and number
in assigned segment
3
In QUEST four 25 m transects will be sampled
per team
4 m
2 m
25 m
25 m
2 m
4
Fish Belt-Transect - NOAA Program Method

• Fish identified to species counted
• Swim-out record fish gt20 cm in 4m wide swath
• Swim-back record fish lt20 cm in 2m wide swath

Transect 2 25 m
Diver 2
2m

• Common species listed
• Enter number and
• of each

Transect 1 25 m
Diver 1
5
Abundance Diversity Measures
Species Richness of species in the
community Heterogeneity measure of diversity
combining species richness evenness Evenness
degree of equal commonness of species in the
community
6
Diversity Indices
Simpson's diversity index (D) a measure that
characterizes species diversity in a community D
(1 / Spi2) pi proportion of species of
total Evenness ED D/S) S species richness
7
Diversity Indices
Species 1 3 3/6 0.500 Species 2 2 2/6
0.333 Species 3 1 1/6 0.166 6 D (1 /
0.50020.33320.1662) D Evenness ED D/S)
S species richness ED
8
Diversity Indices
Shannon diversity index (H) another index
commonly used to characterize species diversity
in a community H (-1) S (piln pi) pi
proportion of species of total Higher value
more diverse 5.0 high in nature Evenness EH
(H/ ln S) S species richness value between
0 1.0 1.0 even
9
Diversity Indices
Species 1 3 3/6 0.500 Species 2 2 2/6
0.333 Species 3 1 1/6 0.166 6 H (-1)
(0.500 ln 0.500) (0.333 ln 0.333) (0.166
ln 0.166) H Evenness EH (H/ ln S) EH