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51.
A. V. Artem’ev 《Russian Journal of Ecology》2010,41(5):418-421
On the basis of long-term studies on the ecology of pied flycatcher in Karelia, it has been shown that male nonparticipation
in nestling feeding is due to the course of postnuptial molt rather than to the mode of mating relationships, as it was considered
previously. This is confirmed by the results of selective capture of birds that have stopped to feed their brood. It is suggested
that reduction of parental care is associated with changes in the hormonal balance of molting birds. 相似文献
52.
Liang Jun Shao Yantao Huang Dongping Yang Chunxiu Liu Tao Zeng Xiaoyun Li Chunling Tang Zhenghua Juan Jennifer Tan Hui Song Yanye Liu Shun Qiu Xiaoqiang 《Environmental science and pollution research international》2023,30(10):25013-25023
Environmental Science and Pollution Research - Telomere length (TL) at birth is related to diseases that may arise in the future and long-term health. Bisphenols exhibit toxic effects and can cross... 相似文献
53.
Bradley S. Williams Ellen D’Amico Jude H. Kastens James H. Thorp Joseph E. Flotemersch Martin C. Thoms 《Environmental monitoring and assessment》2013,185(9):7485-7499
River systems consist of hydrogeomorphic patches (HPs) that emerge at multiple spatiotemporal scales. Functional process zones (FPZs) are HPs that exist at the river valley scale and are important strata for framing whole-watershed research questions and management plans. Hierarchical classification procedures aid in HP identification by grouping sections of river based on their hydrogeomorphic character; however, collecting data required for such procedures with field-based methods is often impractical. We developed a set of GIS-based tools that facilitate rapid, low cost riverine landscape characterization and FPZ classification. Our tools, termed RESonate, consist of a custom toolbox designed for ESRI ArcGIS®. RESonate automatically extracts 13 hydrogeomorphic variables from readily available geospatial datasets and datasets derived from modeling procedures. An advanced 2D flood model, FLDPLN, designed for MATLAB® is used to determine valley morphology by systematically flooding river networks. When used in conjunction with other modeling procedures, RESonate and FLDPLN can assess the character of large river networks quickly and at very low costs. Here we describe tool and model functions in addition to their benefits, limitations, and applications. 相似文献
54.
The effect of invertebrate predation pressure by the cladoceran Leptodora kindti on the population structure of Daphnia galeata and D. hyalina has been estimated by analyzing the occurrence frequency of the normal and spined morphotypes in Lake Baikal. It is shown
that the growth of L. kindti population density leads to an increase in the proportion of the spined morphotype, while that of that of the normal morphotype
decreases. 相似文献
55.
Leena Hamberg Minna Malmivaara-Lämsä Susanna Lehvävirta Robert B. O’Hara D. Johan Kotze 《Journal of environmental management》2010,91(9):1811-1820
We investigated the effects of human trampling on boreal forest understory vegetation on, and off paths from suburban forest edges towards the interiors and on the likelihood of trampling-aided dispersal into the forests for three years by carrying out a trampling experiment. We showed that the vegetation was highly sensitive to trampling. Even low levels of trampling considerably decreased covers of the most abundant species on the paths. Cover decreased between 10 and 30% on paths which had been trampled 35 times, and at least by 50% on those trampled 70–270 times. On-path vegetation cover decreased similarly at forest edges and in the interiors. However, some open habitat plant species that occurred outside the forest patches and at forest edges dispersed into the forests, possibly through the action of trampling. A higher cover percentage of an open habitat species at the forest edge line increased its probability to disperse into the forest interior. The vegetation community on, next to, and away from lightly trampled paths remained the same throughout the trampling experiment. For heavily trampled paths, the community changed drastically on the paths, but stayed relatively similar next to and away from the paths. As boreal vegetation is highly sensitive to the effects of trampling, overall ease of access throughout the forest floor should be restricted to avoid the excessive creation of spontaneous paths. To minimize the effects of trampling, recreational use could be guided to the maintained path network in heavily used areas. 相似文献
56.
喀斯特石山地区社会经济与生态环境可持续发展系统研究:以桂西北为例 总被引:5,自引:0,他引:5
本建立了广西西北部喀斯特石山地区可持续发展的系统动力学模型。并用DYNAMO程序预测了未来20年桂西北地区的人口、工业、农业、第三产业,生态环境,土地资源,社会总产值,人均国民收人等的动态变化趋势,结果显示,该地区由于人口,工业资产增加使物质和能源消耗增长太快,而对污染治理的投入又太少,导致桂西北地区的生存环境质量下降,因此应当加大对污染治理的投入力度,改善区域环境质量,这是实现息烽县区域可持续发展的关键,根据区域特点探讨了桂西北喀斯特贫困山区的形成演化,提出了可持续发展的途径。 相似文献
57.
58.
Nicresse L. Guedegba Ibrahim Imorou Toko Prudencio T. Agbohessi Berny’s Zoumenou Caroline Douny Syaghalirwa N.M. Mandiki 《Journal of environmental science and health. Part. B》2013,48(7):580-589
AbstractThis study aimed to compare the toxicity for fish of two active ingredients (lambda-cyhalothrin-20?g L?1, a pyrethroid, and acetamiprid-15?g L?1, a neonicotinoid) which are components of a commercial insecticide (Acer 35 EC) used in cotton crop in many West African countries. The juveniles of Oreochromis niloticus (4.01?±?0.34?g, mean body weight) were exposed for 96?h to increasing concentrations of active ingredients (lambda-cyhalothrin and acetamiprid) or a mixture similar to Acer 35 EC (composed by 20?g of chemical compound lambda-cyhalothrin and 15?g of acetamiprid dissolved in 1?L of acetone). The experiments were carried out under controlled conditions in aquaria according to OECD Guidelines. During the experiments, the behavioral responses (loss of balance, color change, hyperactivity, etc.) that usually precede death were observed in exposed fish. Mortalities were recorded in each aquarium and the LC50-96h of each chemical was determined. The LC50-96h obtained were respectively 0.1268, 0.0029, 182.9 and 0.5685?ppm for Acer 35 EC, lambda-cyhalothrin, acetamiprid and mixture. All insecticides used in this study had profound impact on Nile tilapia behavior which may confirm the neurotoxicity of each single active compound as well as of their mixture. 相似文献
59.
There is growing concern that recreational shoreline angling activity may negatively impact littoral and riparian habitats
independent of any direct or indirect influences of fish harvest or fishing mortality through mechanisms such as disturbance
(e.g., trampling, erosion) and pollution (e.g., littering). We sampled a suite of aquatic and terrestrial variables (i.e.,
water quality, aquatic and terrestrial macrophytes, soil compaction, anthropogenic refuse) at 14 high shoreline angling-activity
sites (identified by way of interviews with conservation officers and angling clubs) within an urban area (Ottawa, Canada).
For each high angling-activity site, a nearby corresponding low angling-activity site was sampled for comparison. We found
that the percentage of barren area and soil compaction were greater in areas of high angling activity compared with areas
that experienced relatively low angling activity. In addition, terrestrial and aquatic macrophyte density, height, and diversity
were lower at high angling-activity sites. Angling- and non-angling-related litter was present in large quantities at each
of the high angling-activity sites, and comparatively little litter was found at low angling-activity sites. Collectively,
these findings indicate that shoreline angling does alter the riparian environment, contributing to pollution and environmental
degradation in areas of high angling intensity. With growing interest in providing urban angling opportunities and in response
to increasing interest in developing protected areas and parks, a better understanding of the ecologic impacts of shoreline
angling is necessary to address multiuser conflicts, to develop angler outreach and educational materials, and to optimize
management of angling effort to maintain ecologic integrity of riparian and aquatic ecosystems. 相似文献
60.