Influence of Season and Time of Day on Marsh Bird Detections

dc.contributor.author Dinsmore, Stephen
dc.contributor.author Harms, Tyler
dc.contributor.author Dinsmore, Stephen
dc.contributor.author Harms, Tyler
dc.contributor.department Natural Resource Ecology and Management
dc.date 2018-02-17T00:54:17.000
dc.date.accessioned 2020-06-30T06:12:08Z
dc.date.available 2020-06-30T06:12:08Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2014
dc.date.issued 2014-03-01
dc.description.abstract <p>Call-broadcast surveys are frequently used to elicit responses of secretive marsh birds and produce greater detection rates than passive surveys. However, little is known about how detection rates of birds from these surveys differ by season and time of day. We conducted call-broadcast surveys for eight focal species at 56 wetlands throughout Iowa from 15 May–13 June 2010 (early season) and from 15 June–10 July 2010 (late season). Our focal species were Pied-billed Grebe (<em>Podilymbus podiceps</em>), American Bittern (<em>Botaurus lentiginosus</em>), Least Bittern (<em>Ixobrychus exilis</em>), King Rail (<em>Rallus elegans</em>), Virginia Rail (<em>Rallus limicola</em>), Sora (<em>Porzana carolina</em>), Common Gallinule (<em>Gallinula chloropus</em>), and American Coot (<em>Fulica americana</em>). Surveys were conducted in the early morning (30 mins before sunrise to 3 hrs after sunrise) and late evening (3 hrs before sunset to 30 mins after sunset) in accordance with the North American Marsh Bird Monitoring Protocol. We evaluated marsh bird detection rates as a function of a) time of day (morning and evening survey periods), b) season (early and late in the breeding season), and c) wetland size for four species with the greatest detection rates (Pied-billed Grebe, Least Bittern, Virginia Rail, and Sora). We also evaluated the above effects for two species groups; all eight species pooled and all rails pooled. We found significant (<em>P</em> < 0.05) effects on the number of detections for Pied-billed Grebe in response to time of day, time of season, and wetland size; Sora, Virginia Rail, all rails, and all species had an effect of time of season only. Understanding seasonal and time-of-day differences in detection rates, as well as area dependence of secretive marsh birds, will refine existing monitoring protocols by allowing researchers to maximize detection probabilities of target species.</p>
dc.description.comments <p>This article is from <em>Wilson Journal of Ornithology</em> 126 (2014): 30, doi:<a href="http://dx.doi.org/10.1676/13-150.1" target="_blank">10.1676/13-150.1</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/nrem_pubs/187/
dc.identifier.articleid 1186
dc.identifier.contextkey 7595263
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath nrem_pubs/187
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/56201
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/nrem_pubs/187/2014_Dinsmore_InfluenceSeason.pdf|||Fri Jan 14 21:45:42 UTC 2022
dc.source.uri 10.1676/13-150.1
dc.subject.disciplines Environmental Monitoring
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.disciplines Ornithology
dc.subject.keywords bittern
dc.subject.keywords call-broadcast
dc.subject.keywords coot
dc.subject.keywords detection
dc.subject.keywords gallinule
dc.subject.keywords Iowa
dc.subject.keywords marsh bird
dc.subject.keywords rail
dc.title Influence of Season and Time of Day on Marsh Bird Detections
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 93cc6656-8f88-4982-be9c-06bedefca35f
relation.isAuthorOfPublication bdc16099-d09f-40ab-8e99-fb0fb339efca
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
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