2011). Differences in composition are greatest when PHB values are not used to weight ELS points, indicating the significant influence of expert weighting for specific taxa rather than using more general biodiversity value alone. As such, the option
compositions produced may have lower or negative benefits on other taxa; for example cereal headlands for birds (option EF9) have a very low PHB score. While coverage of higher PHB options increased under all models, option redistribution may result in quality habitat becoming more dispersed throughout the landscape; Models B and C by reduction of absolute AES coverage and Model A by the increased points value of the scheme broadening distribution of existing units. Furthermore, the models used to estimate these redistributions are based heavily upon the assumption that the existing area encompassed by ELS is adequate. Although experts were asked what percentage of UK farmland JQ-EZ-05 molecular weight click here they believe should contain good quality pollinator habitat to halt or reverse pollinator declines only 78 % of respondents completed these questions, all indicated no
or little confidence in their answers. Other respondents refused to answer, citing concerns over the implications of such answers. Subsequently, the methods presented are appropriate for estimating the costs of pollinator habitat conservation with current knowledge. Enhancing ELS impacts While many ELS options can provide good quality habitat for pollinators, it is highly unlikely Unoprostone that these measures alone would be able to sustain diverse pollinator communities and are best employed in moderately diverse landscapes, where remnant source populations exist in pockets of high quality semi-natural habitats (Scheper et al. 2013; Batary et al. 2010). By linking and diversifying these semi-natural habitats, ELS options could potentially provide significant value added to the overall landscape (Garibaldi et al. 2011; Ricketts and
Lonsdorf 2013). However, these habitat patches may be widely dispersed across the landscape and be owned by a number of stakeholders with different objectives. To date there are no specific incentives for farmer co-operation within ELS and beyond ELS (e.g. the higher level stewardship—Natural England 2013c) and, aside from habitats protected by the EU’s Habitats Directive (e.g. hay meadows), few incentives for producers to maintain semi-natural habitats outside of already high diversity areas. Unfortunately, because most ELS option uptake is opportunistic, often where measures are already implemented (Sutherland 2009) or where production is low enough that payments are profitable (Hodge and Reader 2010), the uptake of many of the ELS options most beneficial to pollinators remains limited. For example, although uptake of EF4 has increased >100 % since 2007, this still only represents ~1 % of ELS expenditure (Hodge and Reader 2010; Cloither 2013).
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