The Autecology of Eudiaptomus cf drieschi (Poppe & Mrazek 1895 ...

incubated at 24 0 C exhibited extremely high mortality, and did not reach the third
naupliar stage. These results were not included in the analysis.
2.4.2 Data Analysis
Secondary production (P) of the lake population was calculated based on experimental
measurements utilizing the growth increment method from Downing and Rigler (1984):
P = N (m max - m min ) / D (3)
In this calculation, N, is the average number of individuals in a size class at a specific
time. Maximum and minimum biomass (m min and m max ) was measured from the
experiments. Development time (D), was taken as the time it took an individual to grow
from m min to m max .
Finite birth rate (B) was obtained by measuring embryonic development (D) over a
series of temperatures in the laboratory, which was then related to the number of eggs
from the field data (recruitment of eggs to nauplii):
Eggs / L / day = Eggs / Liter / day (4)
D
This is then divided by the size of the population at the specific time to give the birth
rate relative to the field population sampled at the time:
B = Eggs / L / day
No./L
(4a)
The instantaneous birth rate (b), was calculated as:
b = ln (1+B) (5)