Worldwide, frog populations are in decline. Several different fungi have been implicated in (thought to be the cause of)
decreases in frog numbers. In particular, shrub frogs are especially at risk. You test several different fungi species to see
how they affect sample populations of splotched frogs, a close relative of the shrub frog that is not endangered. To do
this, you use the different species of fungi to infect populations of splotched frogs and then measure survival rates of
these frogs at different frog densities. Frog densities are given in column 1 of the table below. The frog population in
column 2 is the control, which was not infected with a fungus.
Initial density of Frog survival Frog survival Frog survival Frog survival Frog survival
frog population rate rate rate rate rate
(before Control Fungus Fungus Fungus Fungus
ee) of B. grenchius B. sporifera B. noeltid B. talbuta
Per how m?
XXXXXXXXXX90 0.5
XXXXXXXXXX87 0.35
XXXXXXXXXX80 0.54
XXXXXXXXXX72 0.36
XXXXXXXXXX.54 0.7
XXXXXXXXXX XXXXXXXXXX
XXXXXXXXXX XXXXXXXXXX
Which of the above fungi act(s) in a density-dependent fashion? List them and explain the reasons for you
choice(s). Specifically, explain how you can tell which fungi are acting in a density-dependent manner and which
fungi are not.
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