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排序方式: 共有238条查询结果,搜索用时 31 毫秒
111.
Bernd R. Sch?ne David L. Rodland Achim Wehrmann Bj?rn Heidel Wolfgang Oschmann Zengjie Zhang Jens Fiebig Lothar Beck 《Marine Biology》2007,150(6):1237-1252
The grey top-shell, Gibbula cineraria is a common member of temperate to cold water kelp forest communities, but its longevity and the age structure of its populations
remains unresolved. Combined measurements of shell growth rates (sclerochronology) and oxygen isotope composition allow analysis
of rate and timing of shell growth. Eight specimens were analyzed from the southern North Sea (near Helgoland, German Bight).
Three age groups were identified but external measurements (width, height, ornamentation patterns and number of whorls) and
shell weight are not adequate for ontogenetic age discrimination. Stable oxygen isotope data is consistent with shell growth
during the interval from April to December in isotopic equilibrium with seawater, and growth increments exhibit strong tidal
controls with fortnightly bundles well preserved. Reliable environmental proxy data (water temperature) can be extracted from
the shell aragonite using conventional stable oxygen isotope analyses, with a temporal resolution of days attainable during
intervals of maximum growth, but annual extremes are not always recorded in the shell. While demonstrating the utility of
G. cineraria as a environmental and potential paleoenvironmental proxy for kelp forest habitats, its longevity has been significantly
overestimated. 相似文献
112.
Jens Newig Nicolas W. Jager Elisa Kochskämper Edward Challies 《Journal of Environmental Policy & Planning》2019,21(3):213-227
ABSTRACTTheory on participatory and collaborative governance maintains that learning is essential to achieve good environmental outcomes. Empirical research has mostly produced individual case studies, and reliable evidence on both antecedents and environmental outcomes of learning remains sparse. Given conceptual ambiguities in the literature, we define governance-related learning in a threefold way: learning as deliberation; as knowledge- and capacity-building; and as informing environmental outputs. We develop nine propositions that explain learning through factors characterizing governance process and context, and three propositions explaining environmental outcomes of learning. We test these propositions drawing on the ‘SCAPE’ database of 307 published case studies of environmental decision-making, using multiple regression models. Results show that learning in all three modes is explained to some extent by a combination of process- and context-related factors. Most factors matter for learning, but with stark differences across the three modes of learning, thus demonstrating the relevance of this differentiated approach. Learning modes build on one another: Deliberation is seen to explain both capacity building and informed outputs, while informed outputs are also explained by capacity building. Contrary to our expectations, none of the learning variables was found to significantly affect environmental outcomes when considered alongside the process- and context-related variables. 相似文献
113.
114.
Christophe?PélabonEmail author ?sa?A.?Borg Jens?Bjelvenmark Iain?Barber Elisabet?Forsgren Trond?Amundsen 《Marine Biology》2005,148(1):189-196
Courtship and body condition of male two-spotted gobies (Gobiusculus flavescens) harbouring naturally acquired microsporidian infections were compared with those of microsporidian-free males under standardized conditions in the lab. Although parasite infection had no apparent effect on individual condition, it significantly affected male courtship intensity. This effect, however, was affected by the intensity of the female courtship. Our study is one of the first to demonstrate a sub-lethal behavioural effect of a microsporidian parasite that could negatively affect the reproductive success of infected individuals. Our results also suggest that secondary sexual traits like courtship may be more sensitive to moderately detrimental effects of parasite infection than classical condition indices. 相似文献
115.
Jens Korsgaard 《Environment international》1983,9(2):97-101
The effect of reduced air infiltration rate caused by energy-saving measures has been studied by comparing the indoor climate in 25 sealed apartments with the conditions in 25 unsealed apartments in four seasonal periods. The indoor temperature in bedrooms during February and March was 19.3 °C in sealed apartments and 17.8 °C in unsealed apartments, and the occupants in the sealed apartments correspondingly complained less frequently of draught problems during the winter. When the frequency of window opening was at its minimum (February–March), there was a higher indoor humidity in sealed compared with unsealed apartments, and this probably accounts for an increased occurrence of house-dust mites in dust from the sealed apartments during the winter. Also in February–March there was a slight increase in the concentration of suspended particulate matter in sealed apartments. Considering health effects of a reduced air infiltration rate, it can be predicted that the increased indoor air humidity will indirectly increase the frequency and severity of house-dust mite allergy in the population. 相似文献
116.
Synn?ve?HellandEmail author Jens?Christian?Nejstgaard Hans?J?rgen?Fyhn Jorun?K.?Egge Ulf?B?mstedt 《Marine Biology》2003,143(2):297-306
Effects of food availability and season on the free amino acid (FAA) and total protein content of the copepod Calanus finmarchicus females were investigated in two mesocosm experiments on the Norwegian west coast in spring and autumn. Starved C. finmarchicus females showed no change in total FAA content, but the FAA pool composition changed drastically. During the first 10 days of starvation the protein content showed a moderate decline (<2 µg ind -1); however, during the following 21 days the total content was drastically reduced, from 63 to 9 µg ind -1. This supports the notion of a sequential catabolism of endogenous nutrients during starvation. In females at high food concentrations, the body protein content increased during spring, but decreased during autumn. The FAA pool composition of females differed between spring and autumn in 14 of the 18 FAA investigated. Reduced body protein content and increased proportion of essential free amino acid were observed during starvation. Similar changes were observed in females sampled at the end of the mesocosm experiments in the autumn. The results suggest that mature C. finmarchicus females are in a negative protein balance during autumn, despite high food concentrations, contributing to a lower fitness than in females maturing during the spring. 相似文献
117.
118.
Ksawery Kuligowski Tjalfe G Poulsen Peder Stoholm Niels Pind Jens Laursen 《Waste management & research》2008,26(4):347-354
Ash from pig manure treated by combustion and thermal gasification was characterized and compared in terms of nutrient, i.e., potassium (K), phosphorus (P) and heavy metal, i.e., cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and zinc (Zn) contents. Total nutrient and metal concentrations were measured using energy dispersive X-ray fluorescence analysis. Acid (HNO3, H2SO4) and water-extractable concentrations were also measured both in non-classified ash and in selected ash particle size fractions using flame atomic absorption spectrometry and colorimetric spectrometry. Results indicate that ash from gasified manure contained more water-extractable K in comparison with combusted manure whereas the opposite was the case with respect to P. Heavy metals Ni, Cr and Cd were present in higher concentrations in the fine particle size fractions (< 30 microm of particle diameter), whereas K, P, Zn and Cu exhibited higher concentrations in the coarser particle size fractions (> 30 microm). 相似文献
119.
1994年进行了德国公司环境报告的第一次排名.1995年和1998年又进行了两次排名,以确定环境报告和陈述的数目已增加的程度,及其质量是否有所改善.基于所使用的基准,已经显示公司报告的质量有颇大差异.虽然总体质量有了改善,但大多数报告都有许多重要不足. 相似文献
120.