SquirrelWeb

A recent study by scientists from the British Trust for Ornithology and Natural England (also see Publications page under Permanent articles) found no evidence that grey squirrels have any significant impact of woodland birds in England. This puts to rest the long held view by some that grey squirrels have been responsible for the marked decline in many woodland bird species in recent years. The scientists used long-term monitoring data for grey squirrels and 38 bird species from across the country and found that, although occasionally grey squirrels may locally suppress populations of some bird species, overall they have little impact on numbers. The story has been published on the BBC ‘Earth News‘ website.

The Northern Ireland Environment Agency (NIEA) is hosting the Northern Ireland Squirrel Forum on the 24 November 2009. The forum has been inactive for several years but there is renewed enthusiasm to conserve the red squirrel in Ireland.  For further details, please go to: www.ni-environment.gov.uk/biodiversity/northern_ireland_squirrel_forum.htm

The advance of the grey squirrel across Northern Ireland has been relentless and over the last 3 years the situation appears to have deteriorated.  The NIEA is excited by the commitment expressed by members of the 3 local squirrel groups and would like to hear for people across Northern Ireland that feel that could volunteer some time to support the red squirrel here.  The NIEA would particularly like to have organised groups running in the south-west and north-west of the NI. Also note that the NIEA are currently supporting an MSc project run by Queens University Belfast looking into the specific needs of red squirrels in the Glens of Antrim with the aim of developing a local species action plan and are considering supporting other research projects. Further information about local squirrel groups and other NIEA involvment can be obtained from: Dr Jon Lees, Wildlife Officer, Biodiversity Unit, Northern Ireland Environment Agency, Klondyke Building, Cromac Ave., Gasworks Business Park, Belfast BT7 2JA. Tel: 028 905 69551

Anna Lisa Signorile, Imperial College London, Silwood Park Campus, SL5 7PY, UK  or  Zoological Society of London, Regents Park, London, NW1 4RY

The American Grey Squirrel is an alien invasive species that has been released many times in several areas across the world for recreational purposes. In Britain, following multiple introductions from the USA and Canada, grey squirrel populations have proven to be a major threat for both wildlife and agroindustry activities and their spread has been quick and unaffected by control programs. In both Ireland and the Piedmont in Italy, on the other hand, only one introduction, each of very few individuals, is supposed to have occurred within the last century and squirrel spread has proven to be relatively slow in both countries. The origin and founding size of the other three Italian populations is still unclear. We hypothesize that low genetic variation and inbreeding depression contribute comparably to differential expansion rates in Italy, Ireland, and the UK compared to ecological factors. The main aim of my PhD project is to evaluate the inbreeding coefficient of European  grey squirrel populations by examining the heterozigosity at specific loci through microsatellite analysis of DNA. Outcomes will be correlated to spread rates. It will be important to include in this analysis the role played by ecological corridors and other ecological factors in squirrels’ spread and hence an analysis of several environmental determinants will be simultaneously carried out. If expansion rate of grey squirrels in Italy are strongly limited by low genetic diversity, it will be important to prevent the four separate Italian populations from merging and thereby potentially increasing their genetic diversity and speeding their joint expansion rate.

This Ph.D. project has been funded by the UK Natural Environment Research Council and will be undertaken at Imperial College London and the Institute of Zoology under the supervision of Dr Dan Reuman, Dr Chris Carbone, Dr Jinliang Wang, and Dr. Tony Sainsbury. Dr Sandro Bertolino of the University of Turin and Dr. Peter Lurz of Newcastle University are outside supervisors and collaborators.

Silvia Flaherty, Institute of Geography, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP. Tel. 0131 650 9172

The red squirrel (Sciurus vulgaris), the only squirrel species native to the UK, is now considered endangered, is listed in the UK Biodiversity Action Plan and is also under legal protection.

The future of red squirrel conservation will depend on the careful selection and management of suitable reserve areas. Several studies have demonstrated the importance of tree species composition and age (related to food availability) on habitat use. However, there exists a critical gap in understanding and quantifying the relationship between squirrel abundance, their habitat use and forest structural factors such as canopy connectivity, tree densities, height heterogeneity.

The aim of this research project is therefore to address this research gap. Methodologically, the aim is to develop remotely-sensed approaches to facilitate data capture on habitat suitability. Ground-based assessment of habitat suitability in large semi-natural Scottish woodlands is prohibitively expensive at national scales. Remote Sensing (RS) enables cost efficient canopy characteristics assessment at such scales.

To achieve these aims, the project objectives are:

– Create a ground-based forest structure and squirrel feeding activity database for Queen Elizabeth Forest Park, Aberfoyle.

– Develop relationships between key stand structure variables and squirrel feeding behaviour for Norway spruce (Picea abies); Lodgepole pine (Pinus contorta) and Scots pine (Pinus sylvestris)

-Generate RS based methodologies for the extraction of key forest structural parameters relating to habitat suitability.

It has been reported that a Svynnerton’s bush squirrel (Paraxerus vexillarius) was seen killing a fruit bat of the species Epomophorus wahlbergi in the canopy of Mwofwomero Forest, in the Rubeho Mountains, Tanzania. It is not clear what caused the squirrel to attack the bat. This unusual siting was reported on the BBC Earth News.

Melissa Marr A new study has started at the Insitute of Zoology, London on whether inbreeding affects the disease status of squirrelpox virus in red squirrels.

Luc Wauters

The Alpine Squirrel Population Ecology Research project celebrates 10 years. Run by Italian scientists, the project is building a fascinating long-term data set on the population dynamics and food resources of red squirrels Sciurus vulgaris living in montane and subalpine conifer forests. There are new opportunities for post-graduate biologists to join in the research programme.

The ASPER (Alpine Squirrel Population Ecology Research) Project: celebrating 10 years

The ASPER studies have been going on for 10 years and are entering a stage whereby the time-series data on population demography and abundance of food resources are suitable to explore habitat selection and local adaptation by red squirrels to the different montane and subalpine conifer forests-types that form the heterogeneous landscape of one of Europe’s biodiversity hotspots, the Alps. Acquiring this knowledge is essential to define red squirrel sanctuaries that must be, at all costs, kept free from expanding grey squirrel populations.

Current research is continuing at 6 study sites: 4 in Central Lombardy Alps and 2 in the Western Alps. For the period 2009-2012 the project leaders are looking for early-stage researchers from EU countries which are interested to participate to the ASPER project. Potential funding might be available in the FP-7-PEOPLE Mari Curie Actions. This EU-program offers fellowships and grants at two levels:

• Activity 1: Initial Training of Researchers = 1 MARIE CURIE ACTION: INITIAL TRAINING NETWORKS (ITN): Post-graduate Ph.D. grants for Early-stage Researchers that want to obtain a Ph.D. degree in a European country different from where they resided or carried out main activity in the past 12 months. For the moment there are no calls open; nxet call is expected for second half of 2009.
• Activity 2: Life-long Training and Career Development = 2.1 MARIE CURIE ACTION: INTRA-EUROPEAN FELLOWSHIPS FOR CAREER DEVELOPMENT (IEF)

Call Reference FP7-PEOPLE -2009-IEF (OJ CO63 of 18 march 2009): deadline of this call 18/08/2009 at 17:00 Brussels local time, see the information package online.

Introduction and objective of the action: to support the career development of experienced researchers (post-doc) at different stages of their careers, and seeks to enhance their individual competence diversification in terms of skill acquisition at multi- or interdisciplinary level. Support is foreseen for individual, trans-national, intra-European fellowships awarded directly at Community level, to the best or most promising researchers from Member States, based on an application made by the researchers in conjunction with the host organisations.

Technical content/scope:

Projects and participants: This action provides financial support for advanced training and trans-national mobility, for a period of 12 to 24 months (full-time equivalent), for individual projects presented by experienced researchers active in Member States in liaison with a host organisation from another Member State or Associated country. The research topic will be chosen by the researcher in collaboration with the host, with a view to achieving a diversification of competences and developing his/her career in a European context.

The ASPER project is run by University of Insubria, Varese (Università degli Studi dell’Insubria, Varese), Italy (host organisation for the project); the name of the Principal Investigator (PI) is Lucas Wauters, the head of the research group is Prof. Guido Tosi.

We propose the following project for an IEF grant:

Proposed title: Interactive effects of consumer fitness, genetic variation and parasites, on producer-consumer dynamics in pulsed resource systems.

Proposal duration: 24 months

Proposal summary

An individual’s fitness is the result of how it optimises resource allocation to survival and reproduction. Reproduction and survival are often constrained by the distribution and abundance of critical resources, especially food. In many temperate ecosystems, resources occur in unpredictable pulses, creating lagged responses in successive trophic levels. So far, consumer dynamics have been mainly explored by studying the effect of producer dynamics on consumer demography. However, the mechanisms underlying the consumer’s response and their interaction with seasonal, age-related and other sources of variation in individual condition, remain largely unexplored. Moreover, some seed-predators seem to have co-evolved with the trees they feed on and anticipate (summer) reproduction, a still poorly understood and controversial response. Therefore, we propose a multi-disciplinary research project to demonstrate that anticipatory reproduction to synchronise population growth with the resource pulse is the result of co-evolution of seed predators with the masting strategy of the trees. If indeed a result of natural selection, the mechanism should occur in different habitats.

The general aim of this IEF project is to explore behavioural mechanisms and phenotypic characteristics that allow squirrels (study species) to anticipate reproduction and start reproductive investment in a period of low availability of high-energy food resources.

The major objectives are: (1) continued monitoring of the producer-consumer dynamics in red squirrels to obtain 11-13 year time-series; (2) focus on the role of individual condition and how it interacts with parasitism rates and individual genetic quality; and (3) explore the role of dispersal in local population dynamics, in different habitats covering an isolation gradient, using a combination of Capture-Mark-Recapture and genetic markers.

The principal role of the post-doc fellow is objective 2. We believe this is a highly innovative aspect of the entire study, since up to date, the majority of studies in population and behavioural ecology have concentrated on one or a few populations of a species, and rarely behavioural studies are combined with demographic ones to explore the mechanisms that drive the dynamics of populations. Even when the role of individual variation in population dynamics is investigated, there are few studies that combine different disciplines such as capture-mark-recapture, genetics, and parasite studies. For example, we found no studies on vertebrates that combined genetic measures of an individual’s condition (e.g. heterozygosity measured by microsatellites), parasite intensity, morphological phenotypic measures of condition and fitness parameters.

Any post-doc interested in developing such a research project is invited to contact me:

Lucas Wauters, PI ASPER project

The ASPER project publications

• BERTOLINO S, WAUTERS LA, DE BRUYN L, CANESTRI-TROTTI G (2003) Prevalence of coccidia parasites (Protozoa) in red squirrels (Sciurus vulgaris): effects of host phenotype and environmental factors. Oecologia 137: 286-295.
• WAUTERS LA, ZANINETTI M, TOSI G, BERTOLINO S (2004) Is coat-clour polymorphism in Eurasian red squirrels (Sciurus vulgaris L.) adaptive? Mammalia 68(1): 37-48.
• BERTOLINO S, VIZZINI A, WAUTERS LA, TOSI G (2004) Consumption of hypogeous and epigeous fungi by the red squirrel (Sciurus vulgaris) in subalpine conifer forests. Forest Ecology and Management 202: 227-233.
• TRIZIO I, CRESTANELLO B, GALBUSERA P, WAUTERS LA, TOSI G, MATTHYSEN E, HAUFFE HC (2005) Geographical distance and physical barriers shape the genetic structure of Eurasian red squirrels (Sciurus vulgaris) in the Italian Alps. Molecular Ecology 14: 469-481.
• WAUTERS LA, BERTOLINO S, ADAMO M, VAN DONGEN S, TOSI G (2005) Food shortage disrupts social organization: the case of red squirrels in conifer forests. Evolutionary Ecology 19: 375-404.
• TATTONI C, PREATONI DG, LURZ PWW, RUSHTON SP, TOSI G, BERTOLINO S, MARTINOLI A, WAUTERS LA (2006) Modelling the expansion of a grey squirrel population: implications for squirrel control. Biological Invasions 8: 1605-1619 (doi:10.1007/s10530-005-3503-z).
• MOLINARI A, WAUTERS LA, AIROLDI G, CERINOTTI F, MARTINOLI A, TOSI G (2006) Cone selection by Eurasian red squirrels in mixed conifer forests in the Italian Alps. Acta Oecologica 30: 1-10 (doi:10.1016/j.actao.2005.11.004).
• WAUTERS, LA, PREATONI DG, MOLINARI A, TOSI G (2007) Radio-tracking squirrels: performance of home range density and linkage estimators with small range and sample size. Ecological Modelling 202: 333-344 (doi:10.1016/j.ecolmodel.2006.11.001).
• WAUTERS LA, VERMEULEN M, VAN DONGEN S, BERTOLINO S, MOLINARI A, TOSI G, MATTHYSEN E (2007) Effects of spatio-temporal variation in food supply on red squirrel Sciurus vulgaris body size and body mass and its consequences for some fitness components. Ecography 30: 51-65.
• DI PIERRO E, MOLINARI A, TOSI G, WAUTERS LA (2008) Exclusive core areas and intrasexual territoriality in Eurasian red squirrels (Sciurus vulgaris) revealed by incremental cluster polygon analysis. Ecological Research 23: 529-542 (doi: 10.1007/s11284-007-0401-0).
• WAUTERS LA, GITHIRU M, BERTOLINO S, MOLINARI A, TOSI G, LENS L (2008) Demography of alpine red squirrel populations in relation to fluctuations in seed crop size. Ecography 31: 104-114 (doi: 10:1111/j.2007.0906-7590.05251.x).
• MARI V, MARTINI S, ROMEO C, MOLINARI A, MARTINOLI A, TOSI G, WAUTERS LA (2008) Record litter size in the Eurasian red squirrel (Sciurus vulgaris). Hystrix It. J. Mamm. 19: 61-65.
• KVÁC M, HOFMANNOVÁ L, BERTOLINO S, WAUTERS L, MODRÝ D (2008) Natural infection with two genotypes of Cryptosporidium in red squirrels (Sciurus vulgaris) in Italy. Folia Parasitologica 55: 95-99.
• SALMASO F, MOLINARI A, DI PIERRO E, GHISLA A, MARTINOLI A, PREATONI D, SERINO G, TOSI G, BERTOLINO S, WAUTERS LA (2009) Estimating and comparing food availability for tree-seed predators in typical pulsed-resource systems: alpine conifer forests. Plant Biosystems 143: xx-xx (in press).
• BERTOLINO S, WAUTERS LA, PIZZUL A, MOLINARI A, LURZ PWW, TOSI G (2009) A general approach of using hair-tubes to monitor the European red squirrel: A method applicable at regional and national scales. Mammalian Biology 74: 210-219 (doi:10.1016/j.mambio.2009.02.003).

The concept of strongholds form part of the Scottish Government’s strategy to conserve the red squirrel, Sciurus vulgaris, in Scotland. Forestry Commission Scotland sought views on the proposals in a consulation exercise that closed on 26th June 2009. Details of the consultation can be found on the FC website.

As a boost to their conservation, more than 30 red squirrels were released into the 13,355 haDundonnell Estate in Wester Ross in January. The scheme to re-establish them in the area was the idea of the Rice family, who own the Dundonnell Estate, with advice from wildlife consultant Roy Dennis. The release was featured in Widlife Extra.