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201.
Habitat-forming organisms often determine the structural properties and food resources available to a wide diversity of associated
mobile species. Sessile invertebrate assemblages on marine hard substrates support an abundant fauna of mobile invertebrates
whose associations with traits of their host assemblages are poorly known. To assess how changes to habitat-forming species
are likely to affect their associated mobile fauna, the relationships between abundance, diversity and composition of mobile
invertebrates and the diversity, cover and composition of the sessile assemblages they use as habitat were quantified in Sydney
Harbour, Australia (33°50′S, 151°16′E). Similar compositions of sessile species were more likely to share a similar composition
of mobile species, but univariate measures of the habitat (percent cover, species and functional diversity, prevalence of
non-indigenous species) did not predict variation in associated mobile assemblages. These results demonstrate that in this
habitat it is difficult to predict the diversity of marine assemblages based on common surrogate measures of biodiversity. 相似文献
202.
Thomas Breuer Andrew M. Robbins Claudia Olejniczak Richard J. Parnell Emma J. Stokes Martha M. Robbins 《Behavioral ecology and sociobiology》2010,64(4):515-528
Variance in male reproductive success is expected to be high in sexually dimorphic mammals, even when it is modulated by the
costs and benefits of group living. Here, we investigate the variance in reproductive success of male western gorillas (Gorilla gorilla), a highly dimorphic primate with long-term male–female associations, using 12.5 years of data collected at Mbeli Bai in
northern Congo. Access to mates and offspring survival were both major sources of variance in male reproductive success. Males
with larger harems had lower offspring mortality with no apparent reduction in female fertility or observed tenure length,
so the size of harems did not seem to be limited by female feeding competition or by the risk of takeovers and infanticide
by outsider males. The lower mortality in larger harems may reflect improved vigilance against predators, and females may
cluster around males that enhance offspring survival. Thus, this study illustrates how a detailed analysis of the components
of male reproductive success can shed light on the interrelated social and ecological aspects that affect it. 相似文献
203.
Climate adaptation planning in practice: an evaluation of adaptation plans from three developed nations 总被引:5,自引:2,他引:3
Benjamin?L.?PrestonEmail author Richard?M.?Westaway Emma?J.?Yuen 《Mitigation and Adaptation Strategies for Global Change》2011,16(4):407-438
Formal planning for climate change adaptation is emerging rapidly at a range of geo-political scales. This first generation
of adaptation plans provides useful information regarding how institutions are framing the issue of adaptation and the range
of processes that are recognized as being part of an adaptation response. To better understand adaptation planning among developed
nations, a set of 57 adaptation plans from Australia, the United Kingdom and the United States was evaluated against a suite
of 19 planning processes identified from existing guidance instruments for adaptation planning. Total scores among evaluated
plans ranged from 16% of the maximum possible score to 61%, with an average of 37%. These results suggest adaptation plans
are largely under-developed. Critical weaknesses in adaptation planning are related to limited consideration for non-climatic
factors as well as neglect for issues of adaptive capacity including entitlements to various forms of capital needed for effective
adaptation. Such gaps in planning suggest there are opportunities for institutions to make better use of existing guidance
for adaptation planning and the need to consider the broader governance context in which adaptation will occur. In addition,
the adaptation options prescribed by adaptation plans reflect a preferential bias toward low-risk capacity-building (72% of
identified options) over the delivery of specific actions to reduce vulnerability. To the extent these findings are representative
of the state of developed nation adaptation planning, there appear to be significant deficiencies in climate change preparedness,
even among those nations often assumed to have the greatest adaptive capacity. 相似文献
204.
Potassium, phosphorus, or nitrogen limit root allocation, tree growth, or litter production in a lowland tropical forest 总被引:5,自引:0,他引:5
Wright SJ Yavitt JB Wurzburger N Turner BL Tanner EV Sayer EJ Santiago LS Kaspari M Hedin LO Harms KE Garcia MN Corre MD 《Ecology》2011,92(8):1616-1625
We maintained a factorial nitrogen (N), phosphorus (P), and potassium (K) addition experiment for 11 years in a humid lowland forest growing on a relatively fertile soil in Panama to evaluate potential nutrient limitation of tree growth rates, fine-litter production, and fine-root biomass. We replicated the eight factorial treatments four times using 32 plots of 40 x 40 m each. The addition of K was associated with significant decreases in stand-level fine-root biomass and, in a companion study of seedlings, decreases in allocation to roots and increases in height growth rates. The addition of K and N together was associated with significant increases in growth rates of saplings and poles (1-10 cm in diameter at breast height) and a further marginally significant decrease in stand-level fine-root biomass. The addition of P was associated with a marginally significant (P = 0.058) increase in fine-litter production that was consistent across all litter fractions. Our experiment provides evidence that N, P, and K all limit forest plants growing on a relatively fertile soil in the lowland tropics, with the strongest evidence for limitation by K among seedlings, saplings, and poles. 相似文献
205.
206.
Paul Dorfman Clare Beattie Frank Burnet David Gibbs James Longhurst Emma Weitkamp 《Local Environment》2013,18(4):399-419
Abstract There exists a clear imperative across the EU and within the UK towards the enhanced integration of community knowledge in environmental and health decision-making processes. The underlying social force that underpins this dynamic is the drive for a more accountable, transparent and publicly acceptable decision-making arena. However, relatively little research has been undertaken on the evaluation of local air quality management consultation in particular. In this context, the paper presents an evaluation of evidence resulting from questionnaire survey and case study research undertaken in the first round of the statutory process of local air quality management (LAQM), in which local authorities are required to consult on their air quality findings and intentions. We suggest that local authority perceptions of the relative abilities of differing stakeholders' grasp of air quality science, the process that translates that science into policy, and the institutional and organizational status of stakeholders (i.e. whether they are statutory or non-statutory stakeholders) may tend to transitively determine the choice of consultation methods used, the communication strategies chosen and the relative integration of stakeholder feedback into the LAQM decision-making process. In order to interrogate this potentially problematic chain of risk communication events, a preliminary conceptual model has been developed to enable the interrogation of the pathways through, and the obstacles to, the translation of air quality knowledge. The task is to unveil the sequential chains of association that comprise the LAQM risk communication process. 相似文献
207.
Punzo Gennaro Castellano Rosalia Bruno Emma 《Environmental and Ecological Statistics》2022,29(4):727-753
Environmental and Ecological Statistics - This study sets up a spatial econometric framework to explore the factors that best describe land consumption in Italy at the municipal level. By modelling... 相似文献
208.
Punzo Gennaro Castellano Rosalia Bruno Emma 《Environmental and Ecological Statistics》2022,29(4):915-926
Environmental and Ecological Statistics - 相似文献