Meta_SGDC

Species diversity (SD) and
genetic diversity (GD) are the two basic levels of biodiversity. In general,
according to the consensus view, the parallel effects of environmental
heterogeneity, area, and connectivity on two levels, can drive a positive
correlation between GD and SD. Conversely, a negative correlation or no
correlation will be expected, if these effects are not parallel. Our
understanding of the relationships between SD and GD among different
ecosystems, sampling methods, species, and under climate change remains
incomplete. In the present study, we conducted a meta-analysis based on 184
observations from 40 studies and found a positive correlation between genetic
structure and community assembly (95% confidence interval, 11.86 – 23.32%).
However, significant relationships were not found in some ecosystems when we
conducted species–genetic diversity correlation analysis based on a single
ecosystem. Moreover, the magnitudes of the correlations generally decreased
with the number of sampling units and the annual average the temperature of
sampling units. In general, our results highlight the positive correlation
between GD and SD, thereby indicating that protecting SD involves protecting GD
in the conservation practice. Furthermore, our results also suggest that global
increases in temperature during the 21st century will have great impacts on
global biodiversity.