![](bg5.png)
and selection can be effectively inhibited, and
eventually the population tends to become consistent
(Whitlock, 1999). However, when the gene flow
(Nm) between populations is less than one, genetic
differentiation may occur due to the obstruction of
gene flow among sub-populations (Chen, et al.,
2004).
In this experiment, the gene flow (Nm) of each
microsatellite locus ranged from 0.226 to 0.553, with
an average of 0.375, which revealed that the gene
exchange between the two populations of
Reticulitermes aculabialis in Xi'an and Nanjing was
weak or non-existent, resulting in a higher genetic
differentiation among populations.
The reason for the low gene exchange between the
two populations was that the termites could not
migrate over a wide range due to the short and limited
flight time and poor flight ability, which limited the
genetic communication among the populations.
Additionally, urban areas were densely populated,
and human activities were frequent. Inter-city eco-
tourism and urbanization construction led to
environmental fragmentation, leading to isolated
nesting and breeding of termites, which in turn
affected genetic communication among populations.
ACKNOWLEDGEMENTS
This work was financially supported by scientific
research project in school-level of Xi’an Pei hua
University (PHKT18064).
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