Miniature temperature data loggers increase precision and reduce bias when estimating the daily survival rate for bird nests

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Niemi, Jarad
Klaver, Robert
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Natural Resource Ecology and Management
The Department of Natural Resource Ecology and Management is dedicated to the understanding, effective management, and sustainable use of our renewable natural resources through the land-grant missions of teaching, research, and extension.
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The Department of Statistics seeks to teach students in the theory and methodology of statistics and statistical analysis, preparing its students for entry-level work in business, industry, commerce, government, or academia.

The Department of Statistics was formed in 1948, emerging from the functions performed at the Statistics Laboratory. Originally included in the College of Sciences and Humanities, in 1971 it became co-directed with the College of Agriculture.

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Iowa Cooperative Fish and Wildlife Research Unit
The Iowa landscape and economy is dominated by production agriculture. Game and non-game wildlife species inhabiting the state are influenced by the destruction, degradation and fragmentation of wetland, prairie and forest habitats caused by intensifying agricultural practices. The Iowa DNR has been involved in long-term species and habitat restoration programs, and evaluating these efforts is important to the DNR. Iowa is bordered on the west by the Missouri River and on the east by the Mississippi River, and numerous native and restored wetlands occur in the northwest. These ecosystems and the resulting production and migration of waterfowl and other migratory birds are of importance to the cooperators.
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Demographic studies of many bird species are challenging because their nests are cryptic, resulting in few nests being found. To maximize statistical power, methods are needed that minimize disturbance while yielding as much information per nest as possible. One way to meet these objectives is to use miniature thermal data loggers to precisely date nest fates. Our objectives, therefore, were to (1) examine the possible effect of thermal data loggers on nest success through hatching by grass- and shrub-nesting songbirds that differed in their parasite egg-accepting and -rejecting behavior, (2) examine the effect of using daily temperature data versus less frequent nest-visit data on statistical power, bias, and precision when estimating the daily survival rate (DSR) for nests, and (3) compare these two approaches using a simulation study and field data. We monitored the survival of nests located in agricultural landscapes and used a binomial logistic regression with main effects for data-loggers and parasite-accepting or -rejecting status and their interaction. We also compared maximum likelihood–derived DSR for differences in estimated rates, precision, and sample sizes with both data collected in the field and simulated with varying sample sizes and visit frequencies. We found no evidence that thermal data loggers had any effect on hatching rates either for all species or for parasite egg-accepting and -rejecting species, separately. Both our simulation and analysis of real nest data indicated that use of data loggers increased the statistical power from each nest studied by increasing effective sample sizes and precision of DSR estimates compared to in-person visits. We also found a negative bias in DSR estimates with longer visit intervals, which use of data-loggers removed. Both the results of simulated- and field-data analyses suggest that future studies of nest survival can be improved by automated nest monitoring by removing a source of bias and providing more time to find additional nests.
This article is published as Stephenson, Matthew D., Lisa A. Schulte, Robert W. Klaver, and Jarad Niemi. "Miniature temperature data loggers increase precision and reduce bias when estimating the daily survival rate for bird nests." Journal of Field Ornithology (2021). doi:10.1111/jofo.12389. Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.