Ticks, Louping Ill and Red Grouse on Moors in Speyside, Scotland

Duncan, James S.; Reid, H.W.; Moss, Robert L.; Phillips, J. D. P.; Watson, Adam

doi:10.2307/3800810

Cited by 32 publications

(20 citation statements)

References 4 publications

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“…Ticks are expected to primarily affect young chick survival [Duncan et al . (), but see Mougeot et al . ()].…”

Section: Discussionmentioning

confidence: 96%

“…Red grouse productivity can be influenced by predator pressure, parasites, disease, habitat and climate (Jenkins et al ., ; Fletcher et al ., ). Even with the range of other potential influences, the present study found that tick abundance on chicks was negatively correlated with chick survival, confirming the findings of previous research (Duncan et al ., ). The range of tick burdens recorded here was comparable with levels reported both before and after sheep acaricide treatments were increased in northern England (Newborn & Baines, ).…”

Section: Discussionmentioning

confidence: 97%

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The effects of acaricide treatment of sheep on red grouseLagopus lagopus scoticatick burdens and productivity in a multi‐host system

Fletcher

Baines

2017

Medical Vet Entomology

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Ixodes ricinus (Ixodida: Ixodidae) ticks are of economic and pathogenic importance across Europe. Within the uplands of the U.K., management to reduce ticks is undertaken to benefit red grouse Lagopus lagopus scotica (Galliformes: Phasianidae). Management strategies focus on the acaricide treatment of domestic sheep Ovis aries (Artiodactyla: Bovidae), but the effectiveness of this is less certain in the presence of wild hosts, particularly red deer Cervus elaphus (Artiodactyla: Cervidae) and mountain hare Lepus timidus (Lagomorpha: Leporidae). This study examines the effects of sheep management on grouse tick burdens and productivity using sites with a range of wild host densities. Sites at which applications of acaricide were more frequent had lower tick burdens; this relationship was similar on sites with a range of deer densities. However, no direct link was detected between acaricide treatment interval and grouse productivity. Sites with higher deer densities had higher grouse tick burdens and lower productivity [mean ± standard error (SE) young : adult ratio: 1.2 ± 0.2] compared with sites with lower deer densities (mean ± SE young : adult ratio: 1.8 ± 0.1). Sites with higher grouse brood sizes and higher proportions of hens with broods were also those with higher mountain hare abundance indices. This study highlights the importance of the frequent treatment of sheep with acaricide to reduce tick burdens on grouse, even in the presence of wild hosts.

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“…Ticks are expected to primarily affect young chick survival [Duncan et al . (), but see Mougeot et al . ()].…”

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 97%

The effects of acaricide treatment of sheep on red grouseLagopus lagopus scoticatick burdens and productivity in a multi‐host system

Fletcher

Baines

2017

Medical Vet Entomology

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“…As well as sucking body fluids and causing inflammation at the point of attachment, ticks are the vector for louping ill, a virus disease fatal to Red Grouse (Duncan et al 1978). As well as sucking body fluids and causing inflammation at the point of attachment, ticks are the vector for louping ill, a virus disease fatal to Red Grouse (Duncan et al 1978).…”

Section: Measurements On Chicksmentioning

confidence: 99%

Population Dynamics of Capercaillie in a North-East Scottish Glen

Moss¹,

Oswald²

1985

Ornis Scandinavica

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org. . Wiley and Nordic Society Oikos are collaborating with JSTOR to digitize, preserve and extend access to Ornis Scandinavica. , J. 1985. Population dynamics of Capercaillie in a North-east Scottish glen. -Ornis Scand. 16: 229-238.During a nine-year study of Capercaillie almost twice as many female as male chicks were reared, but there were no more hens than cocks in the adult population. Both the proportion of male chicks in late summer each year, and mean brood size, were related to the chicks' condition in July. Condition was related to the number of days with rain in early June, during and just after hatching. The breeding density of hens each year varied between 4.0 and 8.0 km-2 but was related neither to their density in the previous year nor to the production of female chicks in the intervening summer. The best predictive model was simply that breeding densities would return to their mean each year. It was inferred that breeding densities were determined by densitydependent losses and gains involving emigration and immigration. Autumn densities of young and old birds were not related to breeding densities and breeding success, but were inversely related to the proportion of broods which disappeared, and probably emigrated, during the summer.

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“…This is the number of nymphs engorging per month. If it is assumed that the average nymph feeding event takes 3 days to complete, then this is equivalent to each host feeding a maximum of five nymphs at any given time, in line with empirical observations undertaken during peak tick activity periods (Duncan et al 1978;Matuschka et al 1991;Carpi et al 2008). Data on larval and adult tick burdens are rare and unreliable (due to detectability and low numbers, respectively).…”

Section: Tick Modelmentioning

confidence: 99%

Epidemiological Implications of Host Biodiversity and Vector Biology: Key Insights from Simple Models

Dobson

Auld

2016

The American Naturalist

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Online enhancement: zip file. Dryad data: http://dx.doi.org/10.5061/dryad.t24pq.abstract: Models used to investigate the relationship between biodiversity change and vector-borne disease risk often do not explicitly include the vector; they instead rely on a frequency-dependent transmission function to represent vector dynamics. However, differences between classes of vector (e.g., ticks and insects) can cause discrepancies in epidemiological responses to environmental change. Using a pair of disease models (mosquito-and tick-borne), we simulated substitutive and additive biodiversity change (where noncompetent hosts replaced or were added to competent hosts, respectively), while considering different relationships between vector and host densities. We found important differences between classes of vector, including an increased likelihood of amplified disease risk under additive biodiversity change in mosquito models, driven by higher vector biting rates. We also draw attention to more general phenomena, such as a negative relationship between initial infection prevalence in vectors and likelihood of dilution, and the potential for a rise in density of infected vectors to occur simultaneously with a decline in proportion of infected hosts. This has important implications; the density of infected vectors is the most valid metric for primarily zoonotic infections, while the proportion of infected hosts is more relevant for infections where humans are a primary host.

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Ticks, Louping Ill and Red Grouse on Moors in Speyside, Scotland

Cited by 32 publications

References 4 publications

The effects of acaricide treatment of sheep on red grouseLagopus lagopus scoticatick burdens and productivity in a multi‐host system

The effects of acaricide treatment of sheep on red grouseLagopus lagopus scoticatick burdens and productivity in a multi‐host system

Population Dynamics of Capercaillie in a North-East Scottish Glen

Epidemiological Implications of Host Biodiversity and Vector Biology: Key Insights from Simple Models

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