The phrase "a decrease in the abundance" is correct and usable in written English.
It can be used in contexts discussing ecological, biological, or resource-related topics where the quantity of something is diminishing.
Example: "The study revealed a decrease in the abundance of certain fish species in the region over the past decade."
Alternatives: "a reduction in the quantity" or "a decline in the prevalence".
Transmission electron microscopy confirmed a decrease in the abundance of extracellular capsular polysaccharide on the mutant SEZ.
Bleach did cause, however, a decrease in the abundance of limpets, which can have further consequences to these systems.
In addition, the respondents reported an increase in the abundance of exotic species and a decrease in the abundance of native species.
Evidence supporting this conclusion includes an increase in Shannon's Diversity Index and a decrease in the abundance of artiodactyl remains over time in southern Mendoza.
In the overstory layer, there was a decrease in the abundance of red oak species (Section Lobatae), mainly black oak (Quercus velutina Lam).
Over time, however, the netting resulted in substantial algal growth that was associated with an increase in abundance of Sparisoma spp. and a decrease in the abundance of S. partitus.
Compensation is said to have occurred when the abundances of a species or functional group increase in order to balance a decrease in the abundances of other species or other functional groups, such that overall community abundances remain constant.
Using this approach, we found that a decrease in the relative abundance of H2A 1B/E was consistently observed, however H2A 1C was present at an elevated abundance, on average, compared to the normal samples (Fig. 1b).
41 Additionally, stress induced a change in the community structure of the microflora in the cecum with a decrease in the relative abundance of bacteria in the genus Bacteroides and an increase in the relative abundance of bacteria in the genus Clostridium.
Overall the introduction of native woody vegetation was associated with a decline in density and biomass of earthworms, including a decrease in the relative abundance of exotic species.
In situ analysis of pax6a revealed a decrease in the total abundance (reduction in staining intensity) in the forebrain region of the morphants (Figure 3D).
