排序方式: 共有5条查询结果,搜索用时 15 毫秒
1
1.
Alexander V. Ereskovsky Maude Dubois Julijana Ivanišević Eve Gazave Pascal Lapebie Daria Tokina Thierry Pérez 《Marine Biology》2013,160(2):423-438
This study presents the phenology of two common Mediterranean sponges belonging to the genus Oscarella (Porifera, Homoscleromorpha). Oscarella tuberculata and Oscarella lobularis are two sibling species, dwellers of shallow benthic communities which tend to have distinct ecological behavior, respectively, euryecious and rather stenoecious. The comparative study of their reproductive cycle showed that both Oscarella species have a seasonal reproductive cycle with a successive phase duration differing from one species to another. In both species, there is a continuous oogenesis, with new oocytes appearing in spring, whereas the spermatogenesis generally starts later with the early warming of the sea. The embryonic development and the larval release are restricted to the warmest months of the year. We also observed a shift in the period of gametogenesis and larval emission depending on species and differences in their sensitivity to changes in thermal regime. It appears that an increase in seawater temperature can affect sex determination, with mainly a shift toward males in both species. Their reproductive efforts are variable in time, and can be in some cases influenced by the temperature regime. This is especially the case of O. lobularis which seems to be the most thermosensitive, its phenology responding significantly to changes in thermal regime, whereas O. tuberculata seems to be less sensitive and/or reactive. By detecting phenological changes among sponges, this study demonstrated the relevance of such monitoring to assess the possible biological response to climate change. 相似文献
2.
3.
Perceptions of climate change risks in primary resource use industries: a survey of the Canadian mining sector 总被引:2,自引:0,他引:2
James D. Ford Tristan Pearce Jason Prno Frank Duerden Lea Berrang Ford Maude Beaumier Tanya Smith 《Regional Environmental Change》2010,10(1):65-81
A survey documenting how climate change is perceived, experienced, and responded to in the Canadian mining sector was administered
to industry practitioners at the Prospectors & Developers Association of Canada annual meeting. Nine key findings from the
survey are discussed: (1) The Canadian mining sector is sensitive to climate-related conditions. (2) Climate change is perceived
to be having a negative impact on mining operations. (3) Companies are taking action to manage the current impacts. (4) Cost
and uncertainty are commonly identified barriers to adapting to current climate change. (5) Future climate change is expected
to have impacts for the industry. (6) Climate change projections are perceived as threats by the majority of respondents.
(7) Despite the perceived threat, companies are not currently taking action to plan for future impacts. (8) Cost and uncertainty
are commonly identified barriers to adapting to future climate change impacts. (9) The mining sector is currently making efforts
to reduce greenhouse gas emissions. The survey is exploratory in nature, establishing a baseline for targeted research to
assess in greater detail the vulnerability of mining to climate change. 相似文献
4.
5.
Tristan?D.?PearceEmail author James?David?Ford Jason?Prno Frank?Duerden Jeremy?Pittman Maude?Beaumier Lea?Berrang-Ford Barry?Smit 《Mitigation and Adaptation Strategies for Global Change》2011,16(3):347-368
Climate is an important component of the operating environment for the Canadian mining sector. However, in recent years mines
across Canada have been affected by significant climatic hazards, several which are regarded to be symptomatic of climate
change. For the mining sector, climate change is a pressing environmental threat and a significant business risk. The extent
to which the mining sector is able to mitigate its own impact and adapt to climate change will affect its long-term success
and prosperity, and have profound economic consequences for host communities. This paper draws upon case studies conducted
with mining operations in Canada involving in-depth interviews with mining professionals and analysis of secondary sources
to characterize the vulnerability of the Canadian mining industry to climate change. Five key findings are discussed: i) mines
in the case studies are affected by climate events that are indicative of climate change, with examples of negative impacts
over the past decade; ii) most mine infrastructure has been designed assuming that the climate is not changing; iii) most
industry stakeholders interviewed view climate change as a minor concern; iv) limited adaption planning for future climate
change is underway; v) significant vulnerabilities exist in the post-operational phase of mines. This paper argues for greater
collaboration among mining companies, regulators, scientists and other industry stakeholders to develop practical adaptation
strategies that can be integrated into existing and new mine operations, including in the post-operational phase. 相似文献
1