The movie Finding Nemo begins with a clown fish family with thousands of eggs. Within a few minutes, all but one egg is eaten by a predator, leaving only Nemo’s egg and his father, Marlin, to be the protagonists of the rest of the movie. What type of survivorship curve does this scenario illustrate?
A. Type 2
B. Type 3
C. Type 4
D. Type 1
The correct answer and explanation is :
Correct Answer: B. Type 3
Explanation (300 words):
The scenario in Finding Nemo—where thousands of clownfish eggs are laid, but nearly all are eaten shortly after, with only one surviving—best illustrates a Type 3 survivorship curve. Survivorship curves are graphical representations that show the likelihood of survival at different ages for a species. There are three primary types: Type 1, Type 2, and Type 3.
A Type 3 survivorship curve is characterized by very high mortality rates early in life, with relatively few individuals surviving to adulthood. However, those that do survive tend to live much longer. This curve is typical of species that produce large numbers of offspring, provide little to no parental care, and rely on the sheer number of offspring to ensure that at least some survive to maturity. Many marine organisms, insects, and plants fall into this category.
In Finding Nemo, the mother clownfish lays hundreds of eggs, a common reproductive strategy among fish. Shortly after, a predator (a barracuda) attacks and consumes all the eggs except one—Nemo. This dramatic early-life mortality followed by the survival of just one individual is the hallmark of a Type 3 curve. The species strategy is to “flood” the environment with offspring, accepting that most will die young, but increasing the odds that a few will reach maturity.
For contrast:
- Type 1 (like humans) shows low mortality early and most live to old age.
- Type 2 (like birds) shows a relatively constant mortality rate across all ages.
- Type 4 is not a standard category in ecological literature, possibly a distractor.
Thus, the life strategy depicted in Finding Nemo aligns perfectly with Type 3 survivorship, emphasizing high infant mortality and low parental investment per offspring.