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The water relations of two tree species in the Euphorbiaceae werecompared to test in part a hypothesis that the forest understorey plays anintegral role in drought response. At Danum, Sabah, the relatively commonspecies Dimorphocalyx muricatus is associated with ridgeswhilst another species, Mallotus wrayi, occurs widely bothon ridges and lower slopes. Sets(More)
Altering root morphology of rice (Oryza sativa L.) cultivars could improve yields in drought-prone upland ecosystems. Marker-assisted backcross breeding was used to introgress four QTLs for root traits into an upland rice cultivar. The QTLs had previously been identified under experimental conditions in a different genetic background. The introgressed lines(More)
Who Harvests and Why? Characteristics of Guatemalan Households Harvesting Xaté (Chamaedorea ernesti-augusti). Cultivation of harvested species is frequently proposed as a conservation strategy to reduce wild harvesting pressure and improve local livelihoods. The success of this approach is likely to be influenced by harvesters’ socioeconomic(More)
a r t i c l e i n f o Although the oceans cover 70% of the surface of the planet few studies have considered the economic valuation of marine biodiversity, despite the importance of such information for marine management and conservation. This study uses a contingent valuation method to estimate the public's willingness to pay (WTP) to avoid loss in the(More)
International agreements and policies play an increasingly prominent role in strategies to combat biodiversity loss. However, conservation policies can only have a conservation impact if implemented. Identifying factors determining the influence of a policy on institutions could improve the process of policy development and communication. We examine how and(More)
This paper presents a linear programming model designed to evaluate the impact of changes in milk to milk-quotaleasing price ratios, nitrogen fertiliser and concentrate prices on the pro®tability of a technically ecient UK dairy farm. The model incorporates energy and protein requirements of cows of di€erent yield levels and allows substitution between(More)
Cultivation of wild-harvested plant species has been proposed as a way of reducing over-exploitation of wild populations but lack of technical knowledge is thought to be a barrier preventing people from cultivating a new species. Training programmes are therefore used to increase technical knowledge to encourage people to adopt cultivation. We assessed the(More)
A coupled ocean-ecosystem model of the Ross Sea: 2. Iron regulation of phytoplankton taxonomic variability and primary production. The real sea change: what can pirates' journals and centuries-old cookbooks teach modern-day ecologists? Nature 443, 622–624 12 Ainley, D.G. (2004) Acquiring a 'base datum of normality' for a marine ecosystem: the Ross Sea,(More)