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Mourning Dove Nesting Habitat and Nest Success in Central Missouri

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Mourning Dove Nesting Habitat and Nest Success in Central Missouri J. Field Ornithol., 69(2):299-305 MOURNING DOVE NESTING HABITAT AND NEST SUCCESS IN CENTRAL MISSOURI RONALD D. DROBNEY BiologicalResources Division, U.S. GeologicalSurvey MissouriCooperative Fish and WildlifeResearch Unit 112 StephensHall Universityof Missouri Columbia, Missouri 65211 USA JOHNH. SCHULZAND STEVEN L. SHERIFF MissouriDepartment of Conservation Fish and WildlifeResearch Center 1110 South CollegeAvenue Columbia, Missouri 65201 USA WESLEYJ. FUEMMELER• MissouriCooperative Fish and WildlifeResearch Unit 112 StephensHall Universityof Missouri Columbia, Missouri 65211 USA Abstract.--PreviousMourning Dove (Zenaidamacroura) nesting studies conducted in areas containinga mixtureof edgeand continuoushabitats have focused on edgehabitats. Con- sequently,little is knownabout the potentialcontribution of continuoushabitats to dove production.In thisstudy we evaluatedthe relativeimportance of thesetwo extensive habitat typesby monitoring the habitatuse and nestsuccess of 59 radio-markeddoves during 1990- 1991 in centralMissouri. Of 83 nestsinitiated by our markedsample, most (81.9%) were locatedin edge habitats.Although continuous habitats were selectedless as nestsites, the proportionof successfulnests did not differ significantlyfrom that in edge habitats.Our data indicate that continuoushabitats should not be consideredmarginal nestinghabitat. If the intensityof useand nestsuccess that we observedare representativeregionally or na- tionally,continuous habitats could contributesubstantially to annualMourning Dove pro- ductionbecause of the high availabilityof thesehabitats throughout much of the Mourning Dove breeding range. HABITAT Y •ITO DE ANIDAMIENTO DE ZENAIDA MACROURA EN LA PARTE CEN- TRAL DE MISSOURI Sinopsis.--Lostrabajos previos sobre el anidamientode la t6rtola Zenaidamacroura en area que contienenuna mezclade bordey habitatcontinuo han enfocadoen los habitatsde borde. Consecuentemente,se conocepoco sobrela contribuci6npotencial de habitatcon- tinuo en la producci6nde la t6rtola.En estetrabajo evaluamos la importanciarelativa de estosdos tipos de habitats,monitoreando mediante el usode radiotransmisores,el uso de habitaty exitode anidamientode 59 aves.E1 estudio se 11ev6a caboen la parte centralde Missouride 1990-1991.De 83 nidoscomenzados por las avesmonitoreadas, la mayoriade estos (81.9%) se localizaron en habitats de borde. Aunque los habitats continuosfueron menosseleccionados por last6rtolas, no seencontro diferencia significativa en la proporcion de nidosexitosos entre los dostipos de habitats.Los datos obtenidos indican que el habitat continuono debe ser consideradohabitat marginalpara la especie.Si la intensidadde uso y exitode anidamientoobservado en estetrabajo son representativos de la situacionregional o nacional,el habitatcontinuo puede contribuirsustancialmente a la producci6nanual de estat6rtola, dado la gran disponibilidaddel mismoa travasde toda la zonautilizada para reproducirsepor esta ave. • Currentaddress: United States Department of Agriculture-NaturalResources Conservation Ser- vice, 235 Oil WellRoad, Jackson, Tennessee 38305, USA. 299 300] R. D. Drotmeyet al. J.Field Ornithol. Spring 1998 Mourning Doves have an extensivebreeding range and nest in both rural and urban areas throughout the contiguousUnited States,Mexico, southern Canada, and portions of Alaska (Aldrich 1993, Tomlinson et al. 1994). As might be expected on the basis of their broad distribution, Mourning Doves use a wide range of habitats for nesting, including ar- boreal and terrestrial sites (Aldrich and Duvall 1958). Because of this flexibility, it is difficult to describe preciselythe characteristicsof dove nesting habitat (Eng 1986:411). Mourning Doves are thought to prefer nesting in trees along wood- land/grasslandedge (Eng 1986:421,Tomlinson et al. 1994), but in areas where these habitatsare absentor limited in availabilitythey commonly nest on the ground in more continuoushabitat typessuch as grasslands and cropfields (Howe and Flake 1989, Soutiereand Bolen 1976). In the Midwest and throughout much of their range, however,Mourning Doves breed in areas containing a mixture of forest, woodland edge, grassland, and cropland habitats.Currently, little is known about how nestsare dis- tributed among these habitat types or the relationship between habitat use and nest successin these diverselandscapes. In the past, most investigatorshave found Mourning Dove nests by traversingselected sites on foot and visuallylocating dove nests (Geissler et al. 1982). Because,this technique is time-consuming,searches are typ- ically conducted at sitesconsidered to be likely nest habitat (i.e., shelter- belts, orchards,groves of deciduousshrubs or pines, and landscapeplant- ings) (Blockstein 1986, Geissleret al. 1982, Hanson and Kossack1963, Westmoreland and Best 1985). With few exceptions (Olson et al. 1991, Schulz and Sheriff 1995, Soutiere and Bolen 1976) continuous habitat types (forest interior, cropfields,grasslands) have rarely been included as nest searchplots in studiesconducted in mixed habitat ecosystems.Con- sequently,their contribution to Mourning Dove production is poorly un- derstood. In order to gain a better understanding of habitat use and nest success by nestingdoves in areascontaining mixed habitat,we usedradio-marked doves to locate nests.Our objectivewas to determine the relative impor- tance of edge and continuoushabitats by comparinguse and nest success in these habitat types. STtJI)Y )W,•^ •a,•I) MET•OI)S Trapping and radio-markingwere conductedon a 673-ha studyarea located on the Davisdale Wildlife Area in central Missouri (39ø01.3'N, 92ø37.5'W). This area was managed primarily for upland game species and contained cropland and open fields interspersedwith blocksof tim- ber and small wooded valleys.Private land surrounding the study area was either intensivelygrazed or cultivated (Fuemmeler 1992). Doveswere captured using modified Kniffen traps (Reeveset al. 1968). Trap siteswere prebaitedwith white Prosomillet for 7 d prior to the first day of trapping for each of five trap periods (16-18 April, 11-20 May, 7- 13 June, 9-11 July, and 30 July-8 August) in 1990. During 1991, doves Vol.69, No. 2 MourningDove Nesting Habitat [301 were trapped in the same manner as in 1990, but trapping periodswere longer and baiting occurred continuouslythroughout the summer.Trap- ping periodsduring 1991 were 8-10 April, 8-15 May, 20-26 May, 17-23 June, 15-21 July, and 29 July-18 August. Each dove used in the nesting studywas weighed to the nearest 1.0 g, banded with a USFWS band, fitted with a radio transmitter, and released at the capture site. Radio transmitters(164-165 MHZ) weighed <6.7 g, had a 130-d life expectancy,and were equipped with a mortality switch. Radioswere back-mountedand attachedusing two elasticbody loops.All research activitieswere conducted with applicable state and federal per- mits. Radio-markeddoves were monitored weekly using ground and/or ae- rial searchesto locate nesting doves and determine nesting habitats.A nest was defined as successfulif the nestlingsreached 10 d of age and there was no indication of mortality. The 10-d criterion is used by the USFWS (Nichols et al. 1984) becausenestlings can fledge at this age (Swank 1955). We assumedthat the nestsof dovesnesting multiple times were independent becauseMourning Dovesare a multiple-nestingspecies (Tomlinson et al. 1994) where nest successor failure is not assumed to affect the fate or location of subsequentor future nests. Nesting habitatswere subdividedinto four categories:(1) forest edge, fencerows,and small wooded valleys;(2) oldfields or partially wooded pastures;(3) agricultural fields or open pastures;and (4) forest interior (>10 m from the edge of a forest opening). In this paper we refer to habitat categories 1 and 2 as edge habitats and categories3 and 4 as continuous habitats. We attemptedto use Mayfield's(1961, 1975;Johnson1979) method to calculatenest survivalrates; this method is basedon daysof exposureand requires a known, consistentnesting period. Instead of Mayfield'smeth- od, we calculatednesting success by using methodsproposed by Olson et al. (1991). We used chi-squaretests to test for significant (P < 0.10) dif- ferencesin nest successamong yearsand habitats. RESULTS The nestsof 59 radio-marked Mourning Doveswere located during the 1990 and 1991 breeding seasons.Doves dispersedwidely between trap sites and nesting areas. During 1991, the outermost locations of radio- marked doves bounded an area of 244.0 km $ (Schulz and Sheriff 1995); outermost locations of dove nests bounded 23.3 km 2 (Fuemmeler 1992). In 1990, 11 radio-marked Mourning Doves were monitored, and 14 nestswere located. Six of these nestswere successfuland produced nine young. We increasedthe sampleof nestingdoves to 69 in 1991 by mon- itoring 48 radio-marked birds. Thirty-sevenpercent of these nestswere successfuland fledged 45 young. The proportion of successfulnests did not differ significantly(X 9 = 0.218, df = 1, P = 0.64) betweenyears. Of the 59 dovesthat nested, 16 attempted >1 nest; 11 attempted two nests, 3 attempted three nests, and 2 attempted four nests. Only 4 of the 16 302] R. D. Drotmeyet al. J.Field Ornithol. Spring 1998 TABLE1. Nesting habitats and nest successof 59 radio-marked Mourning Doves on Davis- dale Wildlife Area, Missouri, during 1990-1991. Successful nests No. of nests (% nest success Habitat type (% in habitat type) by habitat) Edge Habitats Forest edge, fencerows,and small wooded valleys 43 (51.8) 10 (23.2) Partiallywooded pasturesand
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