Long-term abundance differences between habitats were not significant (meadow – young forest, t = 1.41, meadow – advanced forest, t = 1.60, young forest – advanced forest t = 0.33).
The assessments performed for these three plants were unique in employing river-wide sampling data and mathematical models designed to predict the effects of cooling-water withdrawals on the short- and long-term abundance of striped bass and other important fish populations.
This number is an order of magnitude lower than estimates of average long-term abundance estimated from genetic variability [61].
To illustrate the effects of small changes in λ on long-term abundance, we solved for the equation Nt = N0 λt where t = 50 and N0 = 439 (representing the most recent estimate of abundance for Los Islotes Island [15]).
In the absence of available long-term abundance data of H. hampei from the field in coffee producing areas of Africa and the Americas, we resorted to detailed laboratory studies on the effect of temperatures on the bionomics of the beetle.
The interseasonal impacts of ENSO on local dengue dynamics are probably most facilitated through its subsidence-induced drying effects, which in turn, could enhance the long-term abundance of water storage containers for use as breeding sites.
In the long-term, abundances of herbivores, fungivores and carnivores increased along with total nematode abundance.
To analyze dominance at a long-term equilibrium, we calculated the equilibrium when both pathogen types are present and eventually settle near their long-term abundances in the host population.
The tendency of molluscs to avoid grasses has been noted previously (Dirzo 1980) and may in the long term contribute to an increased abundance of grasses in such model systems.
Additional information is becoming available in the form of genetic based estimates of long-term average abundance for both the eastern and western North Pacific populations taken together [64] and improved estimates of present day abundance [65].
In an old-field ecosystem, Kardol et al. (2010) found that differences in soil processes varied more strongly among plant species than between any global change treatments such as watering, added N and elevated CO2, implying that in the long term, even small changes in species abundance would hold more sway than the sum of physiological changes imparted on individual species.
