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31.
Phyt'Eaux Cités: application and validation of a programme to reduce surface water contamination with urban pesticides 总被引:1,自引:0,他引:1
This paper presents first results of Phyt’Eaux Cités, a program put in place by the local water supply agency, the SEDIF (Syndicat des Eaux d’Ile-de-France), in collaboration with 73 local authorities, private societies and institutional offices (365 km2). The challenges included: measurement of the previous surface water contamination, control of urban pesticide applications, prevention of pesticide hazard on users and finally a overall reduction of surface water contamination. An inquiry on urban total pesticide amount was coupled with a surface water bi-weekly monitoring to establish the impact of more than 200 molecules upon the Orge River. For 2007, at least 4400 kg and 92 type of pesticides (essentially herbicides) were quantified for all urban users in the Phyt’Eaux Cités perimeter. At the outlet of the Orge River (bi-weekly sampling in 2007), 11 molecules were always detected above 0.1 μg L−1. They displayed the mainly urban origin of pesticide surface water contamination. Amitrole, AMPA (Aminomethyl Phosphonic Acid), demethyldiuron, diuron, glyphosate and atrazine were quantified with a 100% of frequency in 2007 and 2008 at the Orge River outlet. During the year, peaks of contamination were also registered for MCCP, 2,4 MCPA, 2,4 D, triclopyr, dichlorprop, diflufènican, active substances used in large amount in the urban area. However, some other urban molecules, such as isoxaben or flazasulfuron, were detected with low frequency. During late spring and summer, contamination patterns and load were dominated by glyphosate, amitrole and diuron, essentially applied by cities and urban users. Both isoproturon and chlortoluron were quantified during autumn and winter months according to upstream agricultural practices. In conclusion, 3 years after the beginning of this programme, the cities reduced the use of 68% of the total pesticide amount. An improvement on surface water quality was found from 2008 and during 2009 for all pesticides. In particular, glyphosate showed a decrease of the load above 60% in 2008, partly related to the Phyt’Eaux Cités action. 相似文献
32.
By 2012, Hammarby Sjöstad, a former large industrial harbor area in southern Stockholm, Sweden, will be a fully developed residential district containing approximately 11,000 apartments and accommodating 35,000 people. The transformation of the area began in 1996, and the development soon became renowned for its ambitious environmental program, inspired by Agenda 21 (United Nations in Rio declaration on environment and development. United Nations Department of Economic and Social Affairs (DESA), Rio de Janeiro, 1992) and the Sydney 2000 Olympics in Australia (Newman in Landsc Urban Plan 44:219–226, 1999). Using results based on literature reviews, in-depth interviews, discussions with focus groups, and quantitative data, this paper attempts to gain insight into how the environmental program influenced the planning and performance of the district with regard to sustainable urban development. In doing so, three important conclusions were maintained that could be valuable for similar projects concerning the planning and development of sustainable urban districts. First, the environmental program proved vital to the development process of Hammarby Sjöstad, specifically in its drive to create a sustainable urban district. When planning on improving the sustainability of future districts, such a program should be introduced and integrated earlier in the planning stage of the district. Second, the metabolic flows of Hammarby Sjöstad were reduced as a result of the integrated system—the Hammarby Model—of Hammarby Sjöstad. In order to reduce the metabolic flows in future urban districts even further, it is important to facilitate the integration of technical innovations into existing integrated systems. Third, this case study showed that there was a loss of valid and credible data related to the aims and goals of the environmental program of Hammarby Sjöstad. In future urban districts, it is of the utmost importance to include a clear structure of the assessment process in the environmental program, which would ensure the quality of gathered data and facilitate the development of even better sustainable urban districts in the future. 相似文献
33.
Nils T. Hagen 《Marine Biology》2008,153(5):907-924
Strongylocentrotus droebachiensis is a well known omnivorous sea urchin with an unrivalled capacity to destroy North Atlantic kelp forests. S. pallidus is a lesser known, morphologically similar, and closely related species with no record of destructive grazing, despite its
larger lantern size. I quantify the lantern size of both species using bivariate allometric analysis, and test the hypothesis
that enlarged lantern size facilitates durophagy, the consumption of hard prey, by measuring the feeding capacity of urchins
with different lantern sizes when offered a hard-shelled prey, the blue mussel, Mytilus edulis. The results suggest that S. droebachiensis has a limited capacity for durophagous feeding irrespective of lantern size, whereas in S. pallidus the ability to exploit hard shelled prey is positively related to lantern size. This is apparently the first evidence of
a relationship between trophic morphology and diet in regular sea urchins. The hypothesis of systematic latitudinal variation
in the lantern size of S. pallidus is reappraised and rejected. S. droebachiensis had larger gonads than S. pallidus in field samples, confirming that its small lantern is not impeding nutrient acquisition in shallow habitats. 相似文献
34.
Duarte-Guardia Sandra Peri Pablo L. Amelung Wulf Sheil Douglas Laffan Shawn W. Borchard Nils Bird Michael I. Dieleman Wouter Pepper David A. Zutta Brian Jobbagy Esteban Silva Lucas C. R. Bonser Stephen P. Berhongaray Gonzalo Piñeiro Gervasio Martinez Maria-Jose Cowie Annette L. Ladd Brenton 《Mitigation and Adaptation Strategies for Global Change》2019,24(3):355-372
Mitigation and Adaptation Strategies for Global Change - Soils hold the largest pool of organic carbon (C) on Earth; yet, soil organic carbon (SOC) reservoirs are not well represented in climate... 相似文献
35.
本文回顾了东非和西印度洋的岛屿在海藻、软体动物、鱼类和甲壳类动物的沿海养殖经验和状况.在许多方面,这一地区的沿海水产养殖仍处于发展初期,迫切需要制定旨在提高收入,确保沿海居民对可担负的蛋白质的获得的发展战略. 相似文献
36.
The pH of south Swedish soils have decreased considerably during the last 15–35 years. The decrease has occurred throughout the soil profile, not only in the rhizosphere, and is particularly marked in the originally less acid soils. The pH decrease was accompanied by considerable losses of exchangeable Na, K, Mg and Ca, as well as of Zn and (in the originally less acid soils) of Mn. The changes can be prognosticated from the current relationship between soil pH and base saturation and from budget calculations based on lysimeter data. 相似文献
37.
38.
Behaviors that appear to be plastic may well be determined by environmental influences during development. Being able to produce a wide range of variants of one kind of behavior, e.g., a very short and a very long response time to a stimulus under different environmental conditions, can be described as behavioral plasticity. How such behavioral reaction norms develop for individuals is poorly understood, but several factors are likely to play a role. We investigated what factors may affect how the risk-taking behavior of the lesser wax moth, Achroia grisella, is shaped during ontogeny. We manipulated larval density to represent the potential intensity of future competition for females in a lek of males, determined adult moths’ reaction to predator signals, and tested for plasticity in the silence response, i.e., the acoustic evasion behavior of the moths during the experiments. While we found no effect of larval density on either the probability or the duration of the silence response, 11 % of the variance in duration could be explained by differences between families, and 30 % of the variance was the result of differences between individuals. We found evidence for habituation to the predator signal, clearly indicating that the silence response is a plastic-enough trait to be adjustable to the immediate environment. These results suggest that the degree to which individuals take risks in the context of acoustic signaling depends more on the immediate context and, possibly, genetic differentiation than it is a product of adaptive developmental plasticity. 相似文献
39.
Nils Anthes Johanna Werminghausen Rolanda Lange 《Behavioral ecology and sociobiology》2014,68(3):477-483
Males are limited in sperm and seminal fluid, which can lead to prudent sperm allocation across consecutive matings. While sperm depletion is usually considered a population characteristic, we investigated an individual size-related variation in sperm depletion in the promiscuous sea slug Chelidonura sandrana. We found that sperm counts substantially declined across four successive copulations, indicating sperm depletion. Sperm depletion occurred at a disproportionally fast rate in larger sperm donors. Based on our finding of body size-dependent sperm depletion, we further investigated whether this translates into prudent sperm allocation across ejaculates. We found no evidence that slugs adjusted the number of delivered sperm in response to partner body weight, a tight proxy of fecundity. Instead, sperm counts increased with sperm donor body weight. Sperm donation independent of partner body size and—as found in previous work—partner novelty leaves scope for currently unidentified traits like the sperm competition environment to affect male sperm allocation. Alternatively, we propose that, in C. sandrana, a low optimal male mating rate close to the female optimum as indicated by our data may ultimately render indiscriminate sperm allocation the most beneficial male mating strategy. 相似文献
40.
Yanli Lei Karen Stumm Nils Volkenborn Stephen A. Wickham Ulrike-G. Berninger 《Marine Biology》2010,157(6):1271-1282
The benthic microbial food web can be responsible for a large proportion of benthic carbon cycling yet there are few data
on the trophic interactions between this food web and macrobenthos. A large-scale field experiment was conducted to investigate
effects of eliminating the polychaete Arenicola marina on benthic microbes (prokaryotes, heterotrophic and autotrophic protists) and metazoan meiofauna in a marine intertidal flat
of the North Sea, Germany. Over a period of 2 years, quantity and composition of micro- and meiobenthos from unmanipulated
sites were compared to those from sites deplete of lugworms. These grazer treatments were cross-classified with different
sediment characteristics (low- and mid-intertidal areas). Lugworm removal resulted in an initial increase in abundance of
prokaryotes and nanoflagellates, which became less pronounced in the second year. Ciliates were not affected quantitatively,
but in the absence of lugworms, diversity and the proportion of carnivorous forms increased. Meiobenthos (nematodes, ostracods
and copepods) were affected only moderately. The observed changes are probably due to a combination of release from grazing/predation
pressure, changes in the species composition of higher trophic levels (namely large polychaetes) and altered environmental
conditions (such as depth of the oxygenated layer and sediment grain size). Spatial differences between sites of different
tidal exposure/grain size appeared to be as large as temporal differences during the 2 years following the manipulation of
the system. We conclude that in intertidal sediments, indirect effects due to habitat transformation are as important as direct
biological interactions (grazing pressure and competition) for the dynamics of the benthic microbial food web. 相似文献