Nest Ecology, Productivity, and Growth of the Loggerhead Shrike on the Shortgrass Prairie

Porter, David K.; Strong, Mark A.; Giezentanner, J. Brent; Ryder, Ronald A.; Collins, Fort

doi:10.2307/3670401

Cited by 29 publications

(16 citation statements)

References 6 publications

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“…Shrikes have long been described as birds of farming country (Miller 1931;Bent 1950). More recently, researchers have reported the apparent importance of pastures, grassland, and hayfields as habitat for Loggerhead Shrikes (Porter et al 1975;Seigel 1980;Kridelbaugh 1982;Luukkonen 1987;Gawlick 1988;Smith and Kruse 1992;Telfer 1992;Bjorge and Prescott 1996).…”

Section: Discussionmentioning

confidence: 96%

“…While the characteristics of Loggerhead Shrike breeding habitat have been described by many authors (Porter et al 1975;Seigel 1980;Kridelbaugh 1983;Luukkonen 1987;Gawlick 1988;Brooks and Temple 1990;Prescott and Collister 1993;Woods and Cade 1996), populations of the migrant race of Loggerhead Shrike (L. l. migrans) in Ontario and Quebec have remained largely unstudied, and the nesting habits of these shrikes are relatively unknown. Information on habitat selection can be used to determine if habitat loss is a factor in the continued decline of the Loggerhead Shrike in eastern Canada and will help to guide future management efforts by elucidating limiting factors such as perch density (Yosef 1993).…”

Section: Introductionmentioning

confidence: 98%

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Habitat use by Loggerhead Shrikes in Ontario and Quebec

Chabot¹,

Titman²,

Bird³

2001

Can. J. Zool.

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Once common throughout northeastern North America, the migrant race of Loggerhead Shrike (Lanius ludovicianus migrans) has undergone a drastic decline since the middle of the last century. The subspecies was designated as endangered by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 1991. To gain a better understanding of the factors affecting the decline of this species in eastern Canada, habitat selection by Loggerhead Shrikes breeding in Ontario (Smith's Falls, Napanee, and Carden limestone plains) and southern Quebec was studied in 1991 and 1992. Nest trees used by breeding shrikes were compared with similar arbitrarily identified trees in suitable unoccupied habitat to determine if there was a nest-tree preference. Territories where successful nesting attempts were made (i.e., young fledged from at least one of the eggs laid) were located over a 2-year period; data were not collected for unsuccessful nests or nests used for double-brooding. Thirty-seven nests (50%) were located in hawthorn shrubs (Crataegus spp.) and 29 nests (40%) in red-cedar trees (Juniperus virginianus). White cedar (Thuja occidentalis), buckthorn (Rhamnus catharticus), and ash (Fraxinus spp.) were used infrequently (10%). Sixty-two nests (86%) were located in isolated trees or in a copse. Ten nests (14%) were located in hedgerows. Fifty-one (64%) nest sites were located in an actively grazed pasture. The other nest sites were located in idle pasture, hayfields, or old fields. Nest trees and arbitrarily chosen trees in suitable unoccupied habitat did not differ significantly in average height, width, or canopy concealment. Few differences were detected in the average height of the vegetation or the composition of ground cover within a 10-m radius of nest trees and arbitrarily chosen trees. The average numbers of shrubs per hectare did not differ between breeding sites and suitable unoccupied habitat. Nest trees in the Smith's Falls core breeding area were located significantly closer to roads than arbitrarily chosen trees in suitable unoccupied habitat. Habitat suitability was also assessed according to the density of perches (trees and shrubs), which directly affects the amount of actual utilizable habitat in a territory. Significant differences were found in the amounts of actual habitat and potential habitat. The amount of habitat around active nest sites, historic nest sites, and suitable unoccupied sites was significantly greater around active nest sites. Since few statistically significant differences were found between habitat occupied by shrikes and that which was not used, it is not possible to build a predictive model of suitable breeding habitat for shrikes in this study area. 925Résumé : Autrefois répandue dans tout le nord-est de l'Amérique du Nord, la race migratrice de la Pie-grièche migratrice (Lanius ludovicianus migrans) a subi un déclin sérieux depuis le milieu du siècle. Cette sous-espèce a été mise sur la liste des taxons menacés par le Comité sur le statut des espèces en péril au Canada (CO...

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

Habitat use by Loggerhead Shrikes in Ontario and Quebec

Chabot¹,

Titman²,

Bird³

2001

Can. J. Zool.

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“…Loggerhead Shrikes return from their wintering grounds from mid-February to early May (Porter et al 1975, Stewart 1975, Salt and Salt 1976, Faanes 1981, Kridelbaugh 1983, Janssen 1987, Poole 1992, De Smet 1992, Tyler 1992, Collister 1994, Chabot et al 1995, Woods 1995b, Michaels 1997. Fall migration stretches from about August to late October, with some stragglers leaving the breeding grounds in November (Stewart 1975, Salt and Salt 1976, Faanes 1981, Janssen 1987, Yosef 1996.…”

Section: Brown-headed Cowbird Brood Parasitismmentioning

confidence: 99%

“…Loggerhead Shrikes have been known to raise two clutches in one season (Sprunt 1965, Johnsgard 1979, De Geus 1990, Poole 1992, Tyler 1992, Chabot et al 1995, Yosef 1996 and to renest after failure of the first clutch (Porter et al 1975, Kridelbaugh 1983, Brooks and Temple 1990b, Poole 1992, Hellman 1994, Chabot et al 1995, Woods 1995b, Woods and Cade 1996. Loggerhead Shrikes in southeastern Alberta were not double-brooded and did not successfully renest (Collister 1994).…”

Section: Brown-headed Cowbird Brood Parasitismmentioning

confidence: 99%

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Effects of management practices on grassland birds: Loggerhead Shrike

Dechant¹,

Sondreal²,

Johnson³

et al. 1998

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Testing a GIS Model of Habitat Suitability for a Declining Grassland Bird

Lauver

Busby

Whistler

2002

Environmental Management

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Demand for information that can be used to manage loggerhead shrikes has recently increased because of concern over declining populations and loss of open, non-forested habitat. A previously-developed habitat model was modified to predict shrike habitat quality on Fort Riley Military Reservation (FRMR) in Kansas. Shrike habitat suitability indices were calculated based on the amount of potential and usable foraging habitat, and the number of potential nesting sites within a specified area. Interpretation of high quality digital photographs was used to delineate land cover classes, hedgerows and tree counts. These data were entered into a geographic information system (GIS) as individual data sets. The shrike habitat model was then employed to produce a GIS database predicting low, moderate, and high quality shrike habitat throughout the Reservation. Model results indicated that 67% of the Reservation was suitable habitat for loggerhead shrikes. Although over 80% of FRMR was mapped as grassland, the presence of few to several isolated trees or hedgerows was identified as a key factor in modeling habitat suitability. The accuracy of the GIS model was 82% in predicting suitable (moderate and high quality) loggerhead shrike habitat using an independent set of 66 recent shrike observations. The number of potential nesting sites and percent cover of usable foraging habitat were significantly related to habitat suitability of the sites occupied by shrikes.

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Nest Ecology, Productivity, and Growth of the Loggerhead Shrike on the Shortgrass Prairie

Cited by 29 publications

References 6 publications

Habitat use by Loggerhead Shrikes in Ontario and Quebec

Habitat use by Loggerhead Shrikes in Ontario and Quebec

Effects of management practices on grassland birds: Loggerhead Shrike

Testing a GIS Model of Habitat Suitability for a Declining Grassland Bird

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