by Sara LaJeunesse, Pennsylvania State University
Despite decades of decline, a genetic analysis of ruffed grouse reveals
that Pennsylvania's state bird harbors more genetic diversity and
connectivity than expected. The findings suggest that the iconic game
bird could be maintained in persistent numbers if appropriate
protections are implemented. The study, led by Penn State and
Pennsylvania Game Commission researchers, is published in Molecular Ecology.
According to the researchers, Pennsylvania's ruffed grouse
populations have declined by up to 70% since the early 1960s, with birds
in the southern part of the state particularly affected by West Nile
virus, which is spread by mosquitoes, and by habitat fragmentation due to development.
"By all typical metrics, the ruffed grouse is in a state of rapid
decline," said Julian Avery, associate research professor of wildlife
conservation at Penn State and co-author of the paper. "Yet, until now,
no one had used genetic tools to investigate the effects of this decline
at a deeper level. By applying whole-genome sequencing,
we have found that the bird is genetically better off than we
suspected, which means that habitat protection and other management
interventions can work to protect this species."
Leilton Luna, postdoctoral researcher at Penn State and corresponding author of the paper, explained that when an organism's population size drops too low because of disease or habitat loss, inbreeding can occur, which can lead to a decline in genetic diversity over time.
"Populations with low genetic diversity have a harder time evolving in response to changing environmental conditions
and are at greater risk of extinction," Luna said. "In the case of the
Pennsylvania ruffed grouse, due to the sharp population decline, it
certainly doesn't have the same healthy genetic conditions as it did in
the past. Even so, the current levels of genetic diversity and
connectivity give us great hope for the preservation of this species."
As an initial step, the team produced the first high-quality
reference genome for ruffed grouse. A reference genome, Luna said, is a
representative example of a particular organism's genes.
"This reference genome serves as a standardized genetic baseline,
facilitating accurate comparisons of genome-wide diversity between
individuals and populations," Luna said. "Additionally, this genomic
resource will enable us to investigate important questions, such as
whether specific genetic components, like adapted genes, contribute to
varying population responses to West Nile virus in different ruffed
grouse populations."
To investigate the population health of the ruffed grouse in
Pennsylvania, the research team sequenced 54 individual bird genomes
within habitats that were both fragmented by development and intact. The
researchers examined the sequence data for evidence of gene flow, which indicates that genetic material is readily exchanged among migrating populations.
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