Lu (1998b) notes that semelparity
is often the case with cuttlefish, squid and octopuses, although there are exceptions across each of these groups (see Mangold et al.
agilis populations, though this can be a result of life history traits and a predisposition of marsupials toward semelparity
(Lopes and Leiner, 2015).
In sections on phylogeography and speciation, mating, evolutionary processes, and conservation, biologists look at such topics as the formation of landlocked populations of Atlantic salmon, the brain-pituitary-gonad axis in the Atlantic salmon, the effect of sperm competition on effective population size, the polygenetic analysis of the evolution of semelparity
, and captive breeding and conservation.
In laboratory observations, the females died a few days after hatching the juveniles from their bodies, suggesting semelparity
, this single blowout of procreation also shows up in organisms from salmon to garden squash vines.
American Shad show a latitudinal gradient between semelparity
and iteroparity throughout its range (Leggett and Carscadden, 1978).