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- Wilson, Shaun K., et al.
(author)
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The contribution of macroalgae-associated fishes to small-scale tropical reef fisheries
- 2022
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In: Fish and Fisheries. - : Wiley. - 1467-2960 .- 1467-2979. ; 23:4, s. 847-861
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Journal article (peer-reviewed)abstract
- Macroalgae-dominated reefs are a prominent habitat in tropical seascapes that support a diversity of fishes, including fishery target species. To what extent, then, do macroalgal habitats contribute to small-scale tropical reef fisheries? To address this question we: (1) Quantified the macroalgae-associated fish component in catches from 133 small-scale fisheries, (2) Compared life-history traits relevant to fishing (e.g. growth, longevity) in macroalgal and coral-associated fishes, (3) Examined how macroalgae-associated species can influence catch diversity, trophic level and vulnerability and (4) Explored how tropical fisheries change with the expansion of macroalgal habitats using a case study of fishery-independent data for Seychelles. Fish that utilised macroalgal habitats comprise 24% of the catch, but very few fished species relied entirely on macroalgal or coral habitats post-settlement. Macroalgal and coral-associated fishes had similar life-history traits, although vulnerability to fishing declined with increasing contribution of macroalgae association to the catch, whilst mean trophic level and diversity peaked when macroalgal-associated fish accounted for 20%–30% of catches. The Seychelles case study revealed similar total fish biomass on macroalgal and coral reefs, although the biomass of primary target species increased as macroalgae cover expanded. Our findings reinforce that multiple habitat types are needed to support tropical fishery stability and sustainability. Whilst coral habitats have been the focus of tropical fisheries management, we show the potential for macroalgae-associated fish to support catch size and diversity in ways that reduce vulnerability to overfishing. This is pertinent to seascapes where repeated disturbances are facilitating the replacement of coral reef with macroalgal habitats.
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- Kirschbaum, Miko U.F., et al.
(author)
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Is tree planting an effective strategy for climate change mitigation?
- 2024
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In: Science of the Total Environment. - : Elsevier B.V.. - 0048-9697 .- 1879-1026. ; 909
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Journal article (peer-reviewed)abstract
- The world's forests store large amounts of carbon (C), and growing forests can reduce atmospheric CO2 by storing C in their biomass. This has provided the impetus for world-wide tree planting initiatives to offset fossil-fuel emissions. However, forests interact with their environment in complex and multifaceted ways that must be considered for a balanced assessment of the value of planting trees. First, one needs to consider the potential reversibility of C sequestration in trees through either harvesting or tree death from natural factors. If carbon storage is only temporary, future temperatures will actually be higher than without tree plantings, but cumulative warming will be reduced, contributing both positively and negatively to future climate-change impacts. Alternatively, forests could be used for bioenergy or wood products to replace fossil-fuel use which would obviate the need to consider the possible reversibility of any benefits. Forests also affect the Earth's energy balance through either absorbing or reflecting incoming solar radiation. As forests generally absorb more incoming radiation than bare ground or grasslands, this constitutes an important warming effect that substantially reduces the benefit of C storage, especially in snow-covered regions. Forests also affect other local ecosystem services, such as conserving biodiversity, modifying water and nutrient cycles, and preventing erosion that could be either beneficial or harmful depending on specific circumstances. Considering all these factors, tree plantings may be beneficial or detrimental for mitigating climate-change impacts, but the range of possibilities makes generalisations difficult. Their net benefit depends on many factors that differ between specific circumstances. One can, therefore, neither uncritically endorse tree planting everywhere, nor condemn it as counter-productive. Our aim is to provide key information to enable appropriate assessments to be made under specific circumstances. We conclude our discussion by providing a step-by-step guide for assessing the merit of tree plantings under specific circumstances.
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| 5. |
- Hirons, M., et al.
(author)
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Pursuing climate resilient coffee in Ethiopia – A critical review
- 2018
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In: Geoforum. - : Elsevier BV. - 0016-7185. ; 91, s. 108-116
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Journal article (peer-reviewed)abstract
- This paper provides a multi-scalar examination of the Ethiopian coffee sector and its pursuit of climate resilience. Concern is growing about the potential impact of climate change on Arabica coffee in Ethiopia and the 25 million livelihoods it supports. Arabica coffee has a relatively narrow envelope of climatic suitability and recent studies suggest that the area of bioclimatically suitable space for the species in its native Ethiopia could decline dramatically in the coming decades. We adopt a critical perspective on resilience that reflects on the situated nature of the ecology/science of coffee and climate change and the operation of social, economic, and discursive power across scales, paying particular attention to the differentiated impacts of climate change and associated resilience strategies. This analysis begins by reviewing Ethiopia's Climate Resilient Green Economy strategy and argues that the current lack of attention to coffee is inappropriate considering the coffee sector's vulnerability to climate change, economic importance and association with forests. The paper then examines the contemporary coffee sector which provides the context for reflecting on three potential responses to the threat climate change poses; a spatial response from farmers, adaptive farm management responses such as changing shade levels and the development of the country's genetic resources to cultivate improved varieties. The analysis explores the disconnect between the interventions emerging from national and international institutions and the local context. The multi-scale approach highlights the presence of complex normative trade-offs associated with pursing climate resilience strategies and reinforces the importance of appreciating the dynamics which influence decision-making in the country.
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| 6. |
- Battisti, A, et al.
(author)
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Urticating hairs in arthropods: their nature and medical significance
- 2011
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In: Annual review of entomology. - : Annual Reviews. - 1545-4487 .- 0066-4170. ; 56, s. 203-220
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Journal article (peer-reviewed)abstract
- The ecological phenomenon of arthropods with defensive hairs is widespread. These urticating hairs can be divided into three categories: true setae, which are detachable hairs in Lepidoptera and in New World tarantula spiders; modified setae, which are stiff hairs in lepidopteran larvae; and spines, which are complex and secretion-filled structures in lepidopteran larvae. This review focuses on the true setae because their high density on a large number of common arthropod species has great implications for human and animal health. Morphology and function, interactions with human tissues, epidemiology, and medical impact, including inflammation and allergy in relation to true setae, are addressed. Because data from epidemiological and other clinical studies are ambiguous with regard to frequencies of setae-caused allergic reactions, other mechanisms for setae-mediated disease are suggested. Finally, we briefly discuss current evidence for the adaptive and ecological significance of true setae.
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| 7. |
- Hirons, M., et al.
(author)
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Illegality and inequity in Ghana's cocoa-forest landscape : How formalization can undermine farmers control and benefits from trees on their farms
- 2018
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In: Land Use Policy. - : Elsevier BV. - 0264-8377. ; 76, s. 405-413
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Journal article (peer-reviewed)abstract
- Schemes to promote sustainable forest management have increasingly focused on addressing widespread informalities in timber production, based on the presumed links between formalisation, the maintenance of forest cover and local welfare. This trend is typified by the EU Forest Law Enforcement, Governance and Trade (FLEGT) initiative and associated Voluntary Partnership Agreements (VPA) aimed at eradicating the trade of illegal wood between partner countries and the EU. Yet there is concern that such initiatives might have detrimental impacts on the largely informal rights of local resource users. In order to inform the formalisation agenda, more detailed analysis of the operation of local rights, and how they might be affected by particular schemes is required.This paper focuses on Ghana as a country with a largely informal wood sector that has signed a VPA with the EU for the express purpose of rapid formalisation. Our analysis is guided by a framework for assessing which types of rights might be transformed by particular approaches to formalisation and the subsequent effect this might have on forests and people in particular local contexts. We then apply this framework to an in-depth local case study of on-farm timber governance within a cocoa-forest landscape in Ghana's Central Region to examine how the operation of formal and informal and substantive and procedural rights shape who controls, and benefits from, on-farm timber production. We then analyse the content of the VPA in light of these local realities and assess its potential impacts.Our findings highlight how the substantive rights the state grants to companies are presumed to be balanced with the granting of procedural rights to farmers via the mechanisms of right of refusal to harvest on-farm timber, compensation for damage to cocoa crops and the negotiation of community-level Social Responsibility Agreements with private companies. Yet a comparison of these formal rights with farmers' existing informal rights reveals that farmers' control and access to benefits from trees on their farms are notably higher in the 'illegal' chainsaw dominated informal sector than in the 'legal' state-based system. Farmers choose to maintain trees on farms both to shade cocoa and in anticipation of benefits from their informal sale. The VPA, however, aims to eradicate all informal on-farm timber production and thus threatens existing local rights and benefit capture while diminishing incentives to maintain trees on farm. Rather than further criminalising local systems of timber governance, the maintenance of tree cover and local benefit-sharing would be better served by 1) phasing out timber concessions on farmland, 2) abandoning the distinction between planted and native trees on farms and, 3) understanding, recognizing and respecting the existing informal rights of farmers, traditional authorities and chainsaw loggers to negotiate among themselves patterns of access and control of on-farm trees and timber. In general, the case study challenges the assertion that formalisation is requisite for sustainable forest management and mandates a more nuanced and contextually informed assessment of the assumed costs and benefits associated with particular forms of legal and policy reform.
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| 8. |
- Morel, Alexandra C., et al.
(author)
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Landscape and management influences on smallholder agroforestry yields show shifts during a climate shock
- 2024
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In: Agriculture, Ecosystems and Environment. - 0167-8809. ; 366
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Journal article (peer-reviewed)abstract
- Sustaining yields for smallholder perennial agriculture under a rapidly changing climate regime may require consideration of landscape features and on-farm management decisions in tandem. Optimising landscape and management may not be possible for maximising yields in any one year but maintaining heterogeneous landscapes could be an important climate adaptation strategy. In this study, we observed elevation, forest patch and shade management gradients affecting smallholder coffee (Coffea arabica) yields in a ‘normal’ year versus the 2015/16 El Niño. We generally found a benefit to yields from having leguminous shade trees and low canopy openness, while maintaining diverse shade or varying canopy openness had more complex influences during a climate shock. The two years of observed climate shock were dominated by either drought or high temperatures, with yield responses generally negative. Climate projections for East Africa predict more erratic rainfall and higher temperatures, which will disproportionately impact smallholder farmers.
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