Abstract
Predatory arthropods are one of the most successful groups in sand dune ecosystems despite the severe limiting factors in this environment. Important adaptive traits are nocturnal activity, low metabolism, generalist feeding habits, and ability to burrow or find refuge during unfavorable conditions. Tiger beetles are especially well adapted to and dominant invertebrate predators in western North American sand dunes. Many species are endemic and rare, including Cicindela albissima Rumpp which is restricted to a small area of the Coral Pink Sand Dunes in southwestern Utah. Previous work suggests that rainfall may be the main factor controlling their population size. This study used field and laboratory experiments to test how soil moisture and food affects adult and larval stages of this species. Laboratory tests found that adult females laid more eggs in chambers that were watered more frequently and development through the three larval instars was significantly faster at higher food levels. The field test of supplementary watering and vegetation removal found watered plots attracted more adults that produced greater numbers of first instars. Larvae had higher survival and developed more rapidly in the watered plots than in unwatered and vegetation removal plots. These results suggest that higher amounts of rainfall and associated soil moisture will result in an increase in adult numbers. If projections of increased droughts in the southwest from climate change materialize, supplementing moisture on a larger scale should be considered as a management strategy for improving beetle habitat and reducing their risk of extinction.
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Acknowledgements
We appreciate the logistical support, accommodations and cooperation provided by Mike Franklin, Dean Anderson and other personnel at Coral Pink Sand Dunes State Park during these studies. Special thanks to Chris Keleher of the Utah Department of Natural Resources and Katie Richardson and Mark Capone of the U. S. Fish and Wildlife Service for securing funding for our work and their interest in this. Thanks also to Austin Reese for assisting in the watering and monitoring studies. These studies were made possible by financial support of the State of Utah, Department of Natural Resources, U. S Fish and Wildlife Service and the Bureau of Land Management.
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Knisley, C.B., Gowan, C. & Wirth, C. Effects of soil moisture, vegetation and food on adult activity, oviposition and larval development in the tiger beetle, Cicindela albissima Rumpp. J Insect Conserv 22, 443–449 (2018). https://doi.org/10.1007/s10841-018-0072-x
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DOI: https://doi.org/10.1007/s10841-018-0072-x