Evaluating the Effectiveness of Two Distance-Sampling Techniques for Monitoring Roe Deer (<i>Capreolus capreolus</i>) Densities

Horcajada-Sánchez, Fernando; Barja, Isabel

doi:10.5735/086.052.0304

Cited by 8 publications

(5 citation statements)

References 35 publications

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“…Previous studies established that the mean roe deer density (individuals/100 ha) in the absence of livestock was 5.9 and 5.4 in pines and oaks, respectively, while in the presence of livestock, it was 4.8 and 4.5 for pine and oak habitats 45,46 . The mean density (roe deer/100 ha) obtained with the linear transects was 5.2 ± 0.96 (CV % = 18.22, 95% CI = 3.67 to 7.87); transect data were analyzed using Distance 6.0 47 .…”

Section: Methodsmentioning

confidence: 98%

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The effect of livestock on the physiological condition of roe deer (Capreolus capreolus) is modulated by habitat quality

Horcajada-Sánchez

Escribano-Ávila

Lara‐Romero

et al. 2019

Sci Rep

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Free-range livestock grazing is a widespread human activity that not only modifies natural vegetation but also leads to interactions with wild ungulates. Most commonly, the interactions between cattle and wild ungulates have been studied with a focus on competition for high-quality forage. However, other mechanisms, such as the risk of parasite infection, might better describe this interaction. We aim to determine whether livestock affect roe deer (Capreolus capreolus Linnaeus, 1758) by reducing habitat quality and increasing the probability of infection by shared parasites. We measured noninvasive fecal cortisol metabolites as an indicator of habitat quality as well as the lung nematode larvae burden from the Dictyocaulus genus. A higher Dictyocaulus larvae load was found in the presence of livestock in pines, and feces collected in winter had a higher parasite load than feces collected in autumn. Additionally, fecal cortisol metabolite levels in the roe deer were affected by the interaction between habitat quality and livestock presence and were higher in the poorest habitat and when living in sympatry with cattle. Our results suggest that physiological stress responses in roe deer were mediated by the habitat type and the presence of competitors. The long-term implications of altered physiological responses such as those demonstrated here should be considered in management strategies for deer.

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Section: Methodsmentioning

confidence: 98%

“…The groups with the highest number of roe deer, including the males, were observed during autumn and winter 52 . Therefore, based on this evidence and the species densities in the habitats of the study area 46 , we estimated that the plots would have maintained a minimum of 10 individuals each.…”

Section: Methodsmentioning

confidence: 99%

The effect of livestock on the physiological condition of roe deer (Capreolus capreolus) is modulated by habitat quality

Horcajada-Sánchez

Escribano-Ávila

Lara‐Romero

et al. 2019

Sci Rep

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“…The beginning and the end of each transect were marked using GPS (Azhar et al, 2008; Bekhuis et al, 2008; Wanyama et al, 2009). The transect width was limited to 25 m, for maximum visibility in Combretum–Terminalia woodland and riparian forest habitats (Horcajada–Sanchez & Barja, 2015) and 50 m in the open grassland; savannah grasses, which hide warthogs (Desbiez et al, 2009). During the wet season, DVF possessed partly impenetrable vegetation and its landscape was characterised by topographic ruggedness.…”

Section: Methodsmentioning

confidence: 99%

“…All common warthog individuals at zero distance or at their initial location from the sampling transect line were counted before they moved towards or away from the observers (Corlatti et al, 2017; Kühl et al, 2008; Pollock et al, 2002). The detection function where g ( 0 ) = 1 at zero metres all the animals on the line were detected with a probability of 1 (Buckland et al, 2010; Forsyth & Lange, 2012; Horcajada–Sanchez & Barja, 2015).…”

Section: Methodsmentioning

confidence: 99%

Population density and distribution of common warthog (Phacochoerus africanusGmelin, 1788) in Dabena Valley Forest, Western Ethiopia

2022

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A study about the spatial distribution and density of common warthog (Phacochoerus africanus) was conducted in two focal areas in Dabena Valley Forest, Western Ethiopia, from May 2016 to June 2018. These were Gassi Controlled Area (GCHA) in the southwestern part and Haro Aba Diko Controlled Hunting Area (HADCHA) in the northeastern part of the Valley. Population abundance and densities were analysed using distance sampling method. A total of 246 and 652 warthogs were counted in GCHA and HADCHA, respectively. The two study areas were significantly different during the wet season and during the dry season in the number of common warthog population per transect. During the dry season, HADCHA possessed more mean of cluster density (5.18/km 2 ) than the GCHA (2.37/km 2 ). Common warthog encounter rate ranged from 1.1 to 3.73/km during the wet season in both study areas. The two study areas did not show significant variation (χ 2 = 0.188, df = 1, p = 0.05) in the clusters of common warthog sightings. A high number of common warthog population are threatened by increasing anthropogenic activities. Common warthog's natural habitats and their buffer zones should be properly monitored: Cattle grazing and human encroachment should be prohibited.

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“…linijski transekti) ali točke (točkovni transekti) z namenom pridobitve ocene številčnosti ali gostote opazovanega objekta (npr. Thomas in sod., 2009; Horcajada-Sánchez in Barja, 2015.). Pri tem je treba upoštevati tri glavne predpostavke: (i) objekti na liniji ali točki so zaznani z določeno zanesljivostjo, (ii) opazovani objekti se pred opažanjem ne premikajo, (iii) meritve razdalj in kotov so (dovolj) natančne.…”

Section: Daljinsko Vzorčenje (Absolutna In Relativnaunclassified

Pregled metod za določanje številčnosti prostoživečih parkljarjev

Flajšman¹,

Fležar²,

Pokorny³

et al. 2019

Acta Silvae et Ligni

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Poznavanje absolutne in/ali relativne številčnosti prostoživečih parkljarjev je eden pomembnejših vhodnih podatkov, ki nam omogoča njihovo učinkovito trajnostno upravljanje. V večjem delu Slovenije so prostoživeči parkljarji gospodarsko, motivacijsko in ekološko najpomembnejša skupina divjadi. V procesu njihovega upravljanja trenutno ni uveljavljenih standardnih in rutinskih metod, na podlagi katerih bi lahko zanesljivo ocenjevali absolutno in/ali relativno številčnost na vsakoletni ravni. Metod za spremljanje številčnosti populacij prostoživečih parkljarjev je veliko; pri izbiri najustreznejše je treba upoštevati določene kriterije. Najpomembnejši kriteriji za izbiro metode so obravnavana vrsta parkljarjev, značilnosti habitata, velikost območja, gostota populacije, možnost kontrole in nenazadnje tudi stroški. V Sloveniji je bila za ocenjevanje številčnosti srnjadi in jelenjadi že v rabi metoda štetja kupčkov iztrebkov, poleg katere bi bila primerna tudi metoda kilometrskega indeksa. Pri divjem prašiču za najbolj zanesljive metode veljajo uporaba foto pasti, štetje na pogonih in daljinsko vzorčenje s pomočjo termovizije, pri gamsu pa štetje s tal in monitoring iz zraka.

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Evaluating the Effectiveness of Two Distance-Sampling Techniques for Monitoring Roe Deer (Capreolus capreolus) Densities

Cited by 8 publications

References 35 publications

The effect of livestock on the physiological condition of roe deer (Capreolus capreolus) is modulated by habitat quality

The effect of livestock on the physiological condition of roe deer (Capreolus capreolus) is modulated by habitat quality

Population density and distribution of common warthog (Phacochoerus africanusGmelin, 1788) in Dabena Valley Forest, Western Ethiopia

Pregled metod za določanje številčnosti prostoživečih parkljarjev

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