The phrase "a decrease in diversity" is correct and usable in written English.
It can be used when discussing topics related to ecology, sociology, or any context where diversity is a relevant factor and is diminishing.
Example: "The recent study highlighted a significant decrease in diversity among the species in the region, raising concerns about the ecosystem's health."
Alternatives: "a reduction in diversity" or "a decline in diversity".
We detected a 45% increase in the abundance and a decrease in diversity of rodents in defaunated forests.
In three areas of North America — northwestern and northeastern America and Alaska/Yukon — fossils showed not only a change in plant communities with an increase in fire frequency, but also a decrease in diversity of small mammals.
The landscape of the Lamone valley became more homogeneous, showing a decrease in diversity (Shannon Diversity Index values decreased from 1.81 to 1.58) and the riparian corridor became more human-dominated (Human Habitat values increased from 0.61 to 0.77).
Population-level statistical tests detected evidence of recently restricted gene flow among nest sites in La Selva Maya, a stark contrast to the historical state of panmixia across the region; although overall levels of genetic variation remain high, a decrease in diversity was noted among modern samples originating in the Chiquibul Forest Reserve, Belize.
High dominance of one species correlates with a decrease in diversity, anaerobe load, and lung function [10, 55, 62].
The second one is that the scheme still works in wireless channels such as SUI-3, although with an increase in BER and a decrease in diversity gain.
The pollution resulted in a decrease in taxonomic diversity and a drastic increase in diversity of gene pools in the communities, showing the functional redundancy and robustness of the communities against chemical disturbance.
The ACE and Chao1 richness estimators and the Shannon diversity index indicated a decrease in microeukaryotic diversity and species richness after contamination, and the phylogenetic group that showed the greatest sensitivity to oil was Nematoda (nematodes).
Presence/absence of certain plant functional groups affected plant invader diversity only in 2006 with a decrease in invader diversity in presence of tall herbs (−5%; F1,34 = 5.95, P = 0.02) and legumes (−34%; F1,34 = 5.96, P = 0.02).
In parallel with the decrease in genetic diversity with increasing distance from Africa, a decrease in haplotype diversity and a concomitant increase in LD exist with increasing distance from Africa (Conrad et al. 2006; Jakobsson et al. 2008; Li et al. 2008).
This has unavoidably led to a decrease in genetic diversity.
