The report cites several cases in which overfishing of forage fish has led to the collapse of populations of larger fish or other predators, and suggests that such cases could increase unless catches are reduced.
However, hybridization can also trigger the collapse of populations (and species) by genetic displacement [ 12] and thus the negative effects of hybridization on rare species dominate the discussion in conservation biology [ 1, 13, 14].
We have four possible outcomes: stable L-E systems, stable L-E-R systems, stable P. ridibundus populations, and the collapse of the population (Table 6, Figures 7, 8, and 9).
The collapsing of populations into metapopulations based on ΦST without any geographic supervision as done in previous studies (Mascheretti et al. 2008, 2009) had resulted in the merging of populations with different histories, and thus had reduced our ability to reconstruct the invasion routes followed by the pathogen.
The evolution of these barriers can have many different outcomes, including divergence of populations leading to speciation, collapse of differentiated populations, hybrid speciation or invasion.
The collapse of clam population in the Great South Bay turned out to be even worse on the conservancy's bottomlands, which were donated to the group by the Bluepoints Company of West Sayville.
If it continues unabated shallow-water fish will disappear rapidly with consequent collapse of the population and the fishery.
A study by Karen Kidd et al., in the 22 May 2007 issue of Proceedings of the National Academy of Sciences, showed the collapse of a population of fish in an isolated lake spiked with relatively high levels of the synthetic estrogen 17α-ethinylestradiol.
