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旅游生态学研究进展 总被引:2,自引:1,他引:2
作为生态学和旅游学相交叉的一门新兴分支学科,旅游生态学关注旅游发展中的生态环境问题,以生态学原理指导旅游生态系统管理,是促进旅游业可持续发展的重要理论支撑。论文采用引文可视化分析软件CiteSpace5.3和文献阅读相结合的方法分析旅游生态学研究的国际进展。分析发现,文献数量在进入21世纪后快速增长,文献来源地集中在北美和欧洲国家,研究方法呈现多学科综合性和最新科学技术成果应用及时等特点,研究内容主要集中在旅游活动的生态环境影响、旅游生态系统管理和旅游可持续发展的测度及实现途径3个方面。基于国际进展的分析,论文最后提出我国旅游生态学研究应在学科的基础理论、旅游影响的系统性和持续性、旅游生态修复、旅游开发活动的生态环境影响、生态环境变化对旅游业发展的影响和本土性旅游生态系统管理方法等方面加强。 相似文献
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化感作用研究中的生物测定方法综述 总被引:145,自引:2,他引:145
生物测定是化感作用研究的重要环节。目前很多化感作用研究缺乏规范的生物测定方法。本文对国内外的常用的生物测定方法,这些方法的适应性以及影响生物测定结果的一些因素(如化感物质的收集方法、微生物和溶液渗透压、受体的选择等)进行了综述。并对生物测定结果的表示方法提出了建议。 相似文献
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微生物群落多样性是微生物生态学和环境学研究的重点之一.分子生物学方法应用于微生物群落结构分析使得对环境样品中占大多数的不可培养微生物的研究成为了可能.然而,PCR过程中的偏差(bias)会引起结果并不能如实地再现原始的群落结构,随着多个宏基因组项目的研究,发现所谓的“通用引物”并不能覆盖全部的微生物类型,即使可以添加简并碱基,也无法与通过宏基因组得到的rRNA序列完全匹配,这导致了在诸多研究中会忽略环境中的微生物群落.即使是不经过PCR扩增的元基因组和元转录组学研究方法,对于分子微生物群落也存在着一定的问题. 相似文献
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Extension of methods for jellyfish and ctenophore trophic ecology to large-scale research 总被引:1,自引:0,他引:1
Jennifer E. Purcell 《Hydrobiologia》2009,616(1):23-50
Science has rapidly expanded its frontiers with new technologies in the 20th Century. Oceanography now is studied routinely
by satellite. Predictive models are on global scales. At the same time, blooms of jellyfish and ctenophores have become problematic,
especially after 1980. Although we have learned a great deal about gelatinous zooplankton ecology in the 20th Century on local
scales, we generally have not scaled-up to estimate the extent, the causes, or effects of large blooms. In this age of global
science, research on gelatinous zooplankton needs to utilize large-scale approaches and predictive equations. Some current
techniques enable jellyfish populations (aerial, towed cameras), feeding (metabolic rates, stable isotopes), and dynamics
(predictive modeling) to be studied over large spatial and temporal scales. I use examples of scyphomedusae (Aurelia spp., Cyanea capillata, Chrysaora
quinquecirrha) and Mnemiopsis leidyi ctenophores, for which considerable data exist, to explore expanding from local to global scales of jellyfish trophic ecology.
Regression analyses showed that feeding rates of Aurelia spp. (FR in copepods eaten medusa−1 d−1) generally could be estimated ±50% from in situ data on medusa wet weight (WW) and copepod density; temperature was not a
significant factor. FR of C. capillata and C.
quinquecirrha were similar to those of Aurelia spp.; the combined scyphomedusa regression underestimated measured FR of C.
quinquecirrha and Aurelia spp. by 50% and 180%, respectively, and overestimated measured FR of C. capillata by 25%. Clearance rates (CR in liters cleared of copepods ctenophore−1 d−1) of M. leidyi were reduced in small containers (≤20 l), and a ratio of container-volume to ctenophore-volume of at least 2,500:1 is recommended
for feeding experiments. Clearance rates were significantly related to ctenophore WW, but not to prey density or temperature,
and estimated rates within 10–159%. Respiration rates of medusae and ctenophores were similar across habitats with greatly
ambient different temperatures (10–30°C), and can be predicted from regressions using only mass. These regressions may permit
estimation of feeding effects of gelatinous predators without exhaustive collection of feeding data in situ. I recommend that
data on feeding and metabolism of jellyfish and ctenophores be entered in a database to allow generalized predictive relationships
to be developed to promote inclusion of these important predators in ecosystem studies and models.
Guest editors: K. A. Pitt & J. E. Purcell
Jellyfish Blooms: Causes, Consequences, and Recent Advances 相似文献