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- July 23, 2009
- 06:12 PM
- 412 views
北美蝴蝶物种多样性的统计研究
by Celad Evra in SiGMA Cube
今天在学校听了来自 UC Irvine 的 [Bradford A. Hawkins 教授](http://www.faculty.uci.edu/profile.cfm?faculty_id=4562)的一个讲座。 据说Hawkins 是生物地理学和宏观生态学方面的大牛，可惜听讲前自己没有做足...... Read more »
Hawkins, B., & DeVries, P. (2009) Tropical niche conservatism and the species richness gradient of North American butterflies. Journal of Biogeography. DOI: 10.1111/j.1365-2699.2009.02119.x
- July 23, 2009
- 06:12 PM
- 387 views
北美蝴蝶物种多样性的统计研究
by Celad Evra in SiGMA Cube
今天在学校听了来自 UC Irvine 的 Bradford A. Hawkins 教授的一个讲座。 据说Hawkins 是生物地理学和宏观生态学方面的大牛，可惜听讲前自己没有做足功课，虽然讲座是近期少见的信息量大、富启发意义的题目，却没有听得太明白。 好在回来搜论文找到了 Hawkins 等即将发表的关于同一个研究的论文。 Hawkins 等人使用了墨西哥以北的北美地区夏季和冬季的蝴蝶物种丰度资料，将蝴蝶亚科按照分布范围分成热带和非热带两部分进行讨论。从物种丰度在纬度方向上的梯度看，热带类型的蝴蝶物种明显地表现出夏季向北迁徙或者 recolonize 的趋势；而非热带类型的蝴蝶则很少表现出有长距离的迁移。而以亚科在包括弄蝶总科 Hesperioidea 和凤蝶总科 Papilionoidea 的整个谱系树上的遗传距离（Mean Root Distance, MRD）来看，北美地区靠近热带的南部物种间的距离较短。 如果蝴蝶起源于热带的假设成立，这说明非热带物种多是适应了较寒冷气候的进化支。 根据对 8 个可能因素的回归分析，热带物种的丰度跟温度正相关，与热带地区的距离成负相关。非热带物种丰度与温度的关系更复杂一些。虽然夏季温度还是与物种丰度正相关，冬季温度较高的地区物种丰度却不一定更高。作者提出的解释是对于适应了较寒冷环境的蝴蝶物种，冬季温度有一个最适范围，高于这个范围的温度可能会扰乱休眠期的蝴蝶的生理活动，导致其数量减少甚至局部灭绝。一些对北半球气候变化造成的物种向北迁移的现象可以作为这个观点的一个注脚。 作者在文末指出形成北美蝴蝶多样性梯度的根本原因在于蝴蝶的热带起源和第三纪中期以来的长期气候变化模式。Hawkins 今天在讲座中进一步指出在欧洲、澳大利亚、智利、南非等地区也都发现了类似的梯度分布，可见他的观点具有相当强的解释力。这一研究不仅能用来解释北美现有的蝴蝶多样性梯度，也有可能被用来进一步研究蝴蝶各亚科和物种的进化和迁徙模式。这种研究方法理论上说也应该可以应用于其它起源于热带的物种，但对于蝶科的生活史、习性和物种分布的完整研究是做出这样研究的前提条件，不知道在无脊椎动物中还有哪些物种有这样完整的研究记录。 这一研究也揭示了气候变化引起的冬季温度变化将会给非热带蝴蝶物种带来的问题。从北美地区来看，热带物种可能不会仅仅因为温度上升就迁往更朝北的地区，但非热带物种聚集的地带可能会向北移动，欧洲也是如此，甚至有可能在热带和非热带物种区之间形成一个空白地带，也许会对这些地区的农业和林业产生影响。 Hawkins, B., & DeVries, P. (2009). Tropical niche conservatism and the species richness gradient of North American butterflies Journal of Biogeography DOI: 10.1111/j.1365-2699.2009.02119.x... Read more »
Hawkins, B., & DeVries, P. (2009) Tropical niche conservatism and the species richness gradient of North American butterflies. Journal of Biogeography. DOI: 10.1111/j.1365-2699.2009.02119.x
- August 6, 2009
- 05:46 PM
- 362 views
Bodélé: "More or Less" a major dust source
by Celad Evra in SiGMA Cube
Image via Wikipedia
Recently I am help doing a study on dust transport and deposition
concerning central and northern Libya. [A geochemical study](http://dx.doi.org/10.1016/j.atmosenv.2006.02.020) by my mentors suggest
that some...... Read more »
Washington, R., Bouet, C., Cautenet, G., Mackenzie, E., Ashpole, I., Engelstaedter, S., Lizcano, G., Henderson, G., Schepanski, K., & Tegen, I. (2009) Tipping Elements in Earth Systems Special Feature: Dust as a tipping element: The Bodele Depression, Chad. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.0711850106
OHARA, S., CLARKE, M., & ELATRASH, M. (2006) Field measurements of desert dust deposition in Libya. Atmospheric Environment, 40(21), 3881-3897. DOI: 10.1016/j.atmosenv.2006.02.020
- July 28, 2009
- 04:55 PM
- 353 views
Ocean acidification below the surface
by Celad Evra in SiGMA Cube
The climate change deniers say that climate change and relevant concerns are a fad. Well they must be wrong. From my personal experience I was reminded of [the climate change scenario](http://www.jstor.org/action/doAdvancedSearch?q0=global+warming...... Read more »
John E. Dore, Roger Lukas, Daniel W. Sadler, Matthew J. Church, & David M. Karl. (2009) Physical and biogeochemical modulation of ocean acidification in the central North Pacific. Proceedings of the National Academy of Sciences of the United States of America. DOI: 10.1073/pnas.0906044106
- October 11, 2009
- 01:53 PM
- 315 views
气候变化与生境跟踪
by Celad Evra in SiGMA Cube
Bibliographic Information
Tingley, M. W., Monahan, W. B., Beissinger, S. R. & Moritz,
C. Biogeography, Changing Climates, and Niche Evolution Sackler
Colloquium: Birds track their Grinnellian niche through a ce...... Read more »
Tingley, M., Monahan, W., Beissinger, S., & Moritz, C. (2009) Biogeography, Changing Climates, and Niche Evolution Sackler Colloquium: Birds track their Grinnellian niche through a century of climate change. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.0901562106
- July 30, 2009
- 04:58 PM
- 286 views
A modular tool for vulnerability study
by Celad Evra in SiGMA Cube
The DIVA (Dynamic and Interactive Vulnerability Assessment) tool is a modular "discussion-making" tool developed by the EU funded [DINAS-COAST](http://www.dinas-coast.net/) project. The tool is used to facilitate the assessment of vulnerability in...... Read more »
Hinkel, J., & Klein, R. (2009) Integrating knowledge to assess coastal vulnerability to sea-level rise: The development of the DIVA tool. Global Environmental Change, 19(3), 384-395. DOI: 10.1016/j.gloenvcha.2009.03.002
Adger, W. (2000) Social and ecological resilience: are they related?. Progress in Human Geography, 24(3), 347-364. DOI: 10.1191/030913200701540465
- August 12, 2009
- 06:39 PM
- 276 views
Ecological network analysis: forgotten?
by Celad Evra in SiGMA Cube
A new [preprint article](http://dx.doi.org/10.1016/j.ecolmodel.2009.07.012) pop up in *Ecological Modelling*'s RSS feed today, showing a case study using ecological network analysis in the functional assessment of an estuary ecosystem. I was wonde...... Read more »
Christian, R., Brinson, M., Dame, J., Johnson, G., Peterson, C., & Baird, D. (2009) Ecological network analyses and their use for establishing reference domain in functional assessment of an estuary. Ecological Modelling. DOI: 10.1016/j.ecolmodel.2009.07.012
Christensen, V., & Pauly, D. (1992) ECOPATH II — a software for balancing steady-state ecosystem models and calculating network characteristics. Ecological Modelling, 61(3-4), 169-185. DOI: 10.1016/0304-3800(92)90016-8
- August 4, 2009
- 04:37 PM
- 273 views
Some like it hot ... or variable
by Celad Evra in SiGMA Cube
I have the impression that someone on researchblogging.org has already used a similar title to describe the link between rising temperature and vectors of contagious diseases. But [this article](http://dx.doi.org/10.1073/pnas.0903423106) has point...... Read more »
Paaijmans, K., Read, A., & Thomas, M. (2009) Understanding the link between malaria risk and climate. Proceedings of the National Academy of Sciences. DOI: 10.1073/pnas.0903423106
- July 25, 2009
- 03:34 PM
- 256 views
What is truly adaptive management?
by Celad Evra in SiGMA Cube
Folke et al. (2002) argued that active adaptive management can help resilience-building in social-ecological systems. Active adaptive management, by their definition, considers policy as a set of experiments designed to reveal underlying processes...... Read more »
Claudia Pahl-Wostl. (2009) A conceptual framework for analysing adaptive capacity and multi-level learning processes in resource governance regimes. Global Environmental Change, 19(3), 354-365. DOI: http://dx.doi.org/10.1016/j.gloenvcha.2009.06.001
Carl Folke, Steve Carpenter, Thomas Elmqvist, Lance Gunderson, C S Holling, & Brian Walker. (2002) Resilience and Sustainable Development: Building Adaptive Capacity in a World of Transformations. Ambio, 31(5), 437-440. DOI: http://ambio.allenpress.com/perlserv/?request
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