Dave Parrott

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Leaf senescence is characterized by nitrogen remobilization to developing seeds of annual plants, or surviving organs of perennial species. It has been demonstrated that high carbohydrate levels (carbon “feast”) are associated with the onset of the senescence process. Therefore, the development of model systems allowing the manipulation of leaf(More)
Invasive alien species (IAS) are considered one of the greatest threats to biodiversity, particularly through their interactions with other drivers of change. Horizon scanning, the systematic examination of future potential threats and opportunities, leading to prioritization of IAS threats is seen as an essential component of IAS management. Our aim was to(More)
Walked spotlight transect surveys with distance sampling were used to estimate regional population densities of badger (Meles meles), fox (Vulpes vulpes) and brown hare (Lepus europaeus) in south-west England (Cornwall, Devon, Gloucestershire, Herefordshire) and Wales (Pembrokeshire, Borders, North Wales). All regions were surveyed during spring 2006 with(More)
Previous X-ray diffraction and electron microscopy experiments have suggested that there is an unusual double bilayer structure formed by stratum corneum lipids, with a lamellar spacing of about 131 A (White, S.H., Mirejovsky, D. and King, G.I. (1988) Biochemistry 27, 3725-3732; Hou, S.Y.E., Mitra, A.K., White, S.H., Menon, G.K., Ghadially, R. and Elias,(More)
1. Managing wildlife populations for conservation, control or harvesting involves uncertainty. Nevertheless, decisions need to be made based on the available evidence. The two main sources of uncertainty in population modelling are parameter estimates and structural uncertainty. Structural uncertainty in models is not included as often as parameter(More)
A hedgehog (Erinaceus europaeus) survey was conducted in four regions of west and south-west England during the summer of 2006. In each region, surveys were conducted in a series of 15–18 survey areas each of which contained 1–4 paired amenity grassland (recreation ground, sports field, and village green) and permanent pasture survey sites. Each pair of(More)
Spleen cells from BN rats were separated in a discontinuous density gradient. Cells from different fractions were shown to be functionally diverse. Light cells were highly responsive in MLR, generated little killer activity and enhanced syngeneic recipient's IgM and IgG production in response to SRBC. Dense cells were unable to respond in MLR and suppress(More)
Climate similarity favors biological invasion, but a match between seasonality in the novel range and the timing of life cycle events of the invader also influences the outcome of species introduction. Yet, phenology effects on invasion success have generally been neglected. Here we study whether a phenological mismatch limits the non-native range of a(More)
In the UK, alongside an expanding common buzzard population, there is increasing concern of raptor predation at pheasant release pens. Historically, losses of poults to raptor predation has been low, commonly (90 % of shoots) ≤1 % of birds released into pens, representing a small percentage of losses relative to all causes of mortality. A small number of(More)
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