Effects of Sampling Effort Based on GPS Telemetry on Home-Range Size Estimations

Girard, Irène; Ouellet, Jean‐Pierre; Courtois, Réhaume; Dussault, Christian; Breton, Laůrier

doi:10.2307/3802962

Cited by 182 publications

(174 citation statements)

References 31 publications

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“…The accuracy and precision of home range estimates are influenced by the number of locations. Biased estimates and large errors are associated with MCP estimates derived from <10 positions/individual and kernel estimates derived from <15 positions/ individual (Girard et al 2002). Thus, calculation of MCP and maximum distance was restricted to birds with >10 positions recorded.…”

Section: Estimation Of Home Range Size and Distancesmentioning

confidence: 99%

Demography of Female Greater Prairie-Chickens in Unfragmented Grasslands in Kansas

Augustine¹,

Sandercock²

2011

ACE

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ABSTRACT. Populations of Greater Prairie-Chickens (Tympanuchus cupido) have been declining because of loss and fragmentation of tallgrass prairie habitats, and management plans require contemporary demographic data. Our objectives were to determine whether maternal nutrition or predation were determinants of nesting success and female survival. We captured and radio-marked 43 females at four leks in natural, unfragmented prairie during a 4-year study. Reproductive potential was high because females laid large clutches (10.9 ± 0.3 eggs, n = 24), renested following clutch loss (22.2%, n = 27 females), and had high egg viability (88.6 ± 5.0% of eggs hatched; n = 7 nests), but reproductive traits were not correlated with female morphometrics (mass, or tarsus and keel lengths). Daily survival rate of nests was low (0.928, n = 34 nests) resulting in a predicted nest success rate of 7.4% for a 35-day exposure period. We used known fate models to estimate weekly survival from telemetry data for 40 females. Weekly survival was 0.970 and the extrapolated survival rate for the 6-month breeding season was 45.7%. Using time-sincemarking Cormack-Jolly-Seber models for live encounter data to control for transience, annual apparent survival was 0.277 ± 0.081 SE for 55 marked females after initial capture, and 0.424 ± 0.139 during subsequent intervals. Survival of females was 1.6 to 2.0 times higher during the nonbreeding season than the breeding season, presumably because females are susceptible to predation during incubation and broodrearing. Predation of nests and females may be the main demographic factors limiting population viability because predation, and not maternal nutrition, accounted for unexpectedly low nesting success and breeding season survival of Greater Prairie-Chickens in natural habitats. Future research should investigate rangeland practices that increase residual nesting cover or reduce predator impacts.RÉSUMÉ. Les populations de Tétras des prairies (Tympanuchus cupido) sont en déclin en raison de la perte et de la fragmentation des milieux de prairie à grandes graminées. Les plans de gestion doivent donc s'appuyer sur des données démographiques contemporaines. L'objectif de cette étude était de déterminer si l'alimentation des femelles et la prédation sont des facteurs importants du succès de reproduction et de la survie des femelles. Nous avons capturé et muni de radios 43 femelles provenant de quatre arènes dans des prairies naturelles non fragmentées, au cours d'une étude de quatre ans. Le potentiel de reproduction était élevé étant donné que les femelles produisaient de grosses couvées (10,9 ± 0,3 oeufs, n = 24), qu'elles pouvaient renicher lorsque la première avait échoué (22,2 %, n = 27 femelles) et que la viabilité des oeufs était élevée (88,6 ± 5,0 % d'oeufs éclos; n = 7 nids), mais ces paramètres de reproduction n'étaient pas corrélés avec les mesures morphométriques des femelles (masse, longueur du tarse et du bréchet). Le faible taux de survie quotidien des nids (0,928, n = 34 nids) s'est tradui...

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Section: Estimation Of Home Range Size and Distancesmentioning

confidence: 99%

Demography of Female Greater Prairie-Chickens in Unfragmented Grasslands in Kansas

Augustine¹,

Sandercock²

2011

ACE

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“…During caribou captures, however, we did not find caribou in the area between the Moberly and Quintette herds, and other surveys (Seip, 2002) suggest that caribou may be absent from this region. Similarly, other methods of defining seasonal ranges may have yielded different results (Boulanger & White, 1990;Girard et al, 2002) and range overlap may vary depending on herd densities (e.g., spatial overlap may increase at higher densities). Despite limitations in quantifying spatial overlap, our data suggest that spatial overlap or adjacency of herds is not synonymous with ecological overlap.…”

Section: Spatial Separation and Use Of Vegetation-cover Typesmentioning

confidence: 99%

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Jones

Gillingham

Seip

et al. 2007

Ran

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Woodland caribou (Rangifer tarandus caribou) in British Columbia have been classified into ecotypes based on differences in use of habitat in winter. Although recovery planning focuses on ecotypes, habitat use and selection varies within ecotypes. Our objectives were to compare habitat use and selection among previously identified woodland caribou herds at the transition zone between northern (Moberly, Quintette, and Kennedy herds) and mountain (Parsnip herd) ecotypes in central British Columbia. We developed selection models for each herd in spring, calving, summer/fall, early and late winter. Topographic models best predicted selection by most herds in most seasons, but importance of vegetation-cover was highlighted by disproportionate use of specific vegetation-cover types by all caribou herds (e.g., in early winter, 75% of Kennedy locations were in pine-leading stands, 84% of Parsnip locations were in fir and fir-leading stands, and 87 and 96% of locations were in alpine for the Moberly and Quintette herds, respectively). Using a combination of GPS and VHF radio-collar locations, we documented some spatial overlap among herds within the year, but use of vegetation-cover types and selection of elevations, aspects, and vegetation-cover types differed among herds and within ecotypes in all seasons. Habitat use and selection were most similar between the two northern-ecotype herds residing on the eastern side of the Rocky Mountains. This research indicates that habitat use and selection by caribou herds in all seasons is more variable than ecotype classifications suggest and demonstrates the value of undertaking herd-specific mapping of critical habitat for woodland caribou.

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“…Using the same birds, the latter authors reported home range sizes (according to MCP) ranging from 45.42 km 2 to 142.66 km 2 (51.30-142.66 km 2 for males and from 45.42 to 134.84 km 2 for females) (Martínez et al 2011). These differences in home range size can be logically accounted for the different tracking methods, indicating that radiotracking tends to underestimate measures of home range size in comparison with unbiased GPS satellite tracking technologies (Girard et al 2002;e.g., García-Ripollés et al 2011;López-López et al 2014a). With regards to sex differences in ranging behaviour, previous studies suggested different levels of space use by males and females, with females tending to range across larger areas than males, particularly during the pre-laying and pre-migratory periods (Díaz-Ruiz and Cebollada-Baratas 2011).…”

Section: Discussionmentioning

confidence: 99%

Spatial ecology and habitat use of adult Booted Eagles (Aquila pennata) during the breeding season: implications for conservation

et al. 2016

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Fast-moving technological advances, such as satellite tracking technologies, are providing in-depth information of aspects of avian ecology hitherto unknown. In fact, detailed information about movement ecology and ranging behaviour of birds is important not only from the perspective of the basic ecology, but also from the conservation point of view. This is particularly important in European countries where agricultural intensification, land abandonment and the withdrawal of traditional management agro-forestry practices pose a threat to biodiversity. The Booted Eagle, likewise other forest raptors, is an adequate bioindicator of human-dominated agro-forestry Mediterranean landscapes in which low-intensity traditional agricultural practices still persist. Here, using a combination of an unbiased technology (i.e., GPS telemetry), a wide geographic extension of marked birds (all over Spain), and much larger sample size than in previous works, we provide the first quantitative assessment of the home range size and space use of the Booted Eagle by means of GPS satellite telemetry during the breeding season. Interestingly, our results revealed different levels of space use over the breeding season and showed that eagles perform long distance foraging movements (i.e., [20 km) from the nest throughout the breeding season. This resulted in larger home ranges than reported thus far, and, more interestingly, in an extremely eccentric topology of territories. Hence, management measures for conservation of forest raptors based on setting restrictions around nesting sites using buffer areas of arbitrary radii clearly results in large areas of eagles' home ranges laying outside ''restriction'' areas. Therefore, conservation measures should take into account the full range of agro-forestry habitats encompassed within the home range. Finally, our results support the claim that a large-scale management approach beyond the establishment of a closed network of protected areas such as the Natura 2000 network is necessary for the conservation of Mediterranean raptors.

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Effects of Sampling Effort Based on GPS Telemetry on Home-Range Size Estimations

Cited by 182 publications

References 31 publications

Demography of Female Greater Prairie-Chickens in Unfragmented Grasslands in Kansas

Demography of Female Greater Prairie-Chickens in Unfragmented Grasslands in Kansas

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Spatial ecology and habitat use of adult Booted Eagles (Aquila pennata) during the breeding season: implications for conservation

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