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排序方式: 共有94条查询结果,搜索用时 31 毫秒
11.
O. E. Diekmann L. Gouveia J. A. Perez C. Gil-Rodriguez E. A. Serrão 《Marine Biology》2010,157(9):2109-2115
Seagrasses and their habitat are declining worldwide. Zostera noltii in the Canary Islands has been drastically reduced, mainly by anthropogenic disturbance, to three small surviving patches
in a single harbor in Lanzarote. A previous genetic study, using neutral microsatellite markers, revealed that these patches
consist of a single clonal individual. Here, an assignment test, using microsatellite data, was used to locate the most likely
population of origin from a set of possible donor populations. Our results show that the Moulay Bousselham population in northern
Morocco is assigned as the most likely population of origin (88%), although the probability of being at one generation time
distance is low (2.7%). This result, however, allows locating the most closely related stands that may be the most successful
donor populations for future restoration based on shoot or seed transplantation. 相似文献
12.
13.
Aude Tessier Mélie Sarreau Fanny Pelluard Gwenaelle André Sophie Blesson Martine Bucourt Pierre Dechelotte Laurence Faivre Thierry Frébourg Alice Goldenberg Valérie Goua Corinne Jeanne-Pasquier Fabien Guimiot Annie Laquerriere Nicole Laurent Mathilde Lefebvre Philippe Loget Martine Maréchaud Charlotte Mechler Marie-Josée Perez Jean Christophe Sabourin Alain Verloes Sophie Patrier Anne-Marie Guerrot 《黑龙江环境通报》2016,36(13):1270-1275
14.
Clemens Gros Evan Easton-Calabria Meghan Bailey Kadirbyek Dagys Erin Coughlan de Perez Munguntuya Sharavnyambuu Andrew Kruczkiewicz 《Disasters》2022,46(1):95-118
This paper presents evidence relating to a forecast-based cash and non-food item distribution among vulnerable herder households during the 2017–18 dzud (extreme winter) season in Mongolia, and analyses the results of a quasi-experimental study evaluating its impacts. An innovative approach in disaster risk reduction, forecast-based financing (FbF) can have short- and long-term benefits to vulnerable households but remains understudied. The paper contributes information on a multimodal FbF programme offering one-off cash grants and in-kind veterinary kits. The data found significant effects of reduced mortality and increased offspring survival in some types of livestock, and that the timing of FbF assistance is crucial, as reported early assistance correlated to positive outcomes in terms of reduced animal mortality. These findings can be used to design more effective FbF interventions, to understand better the appropriateness of FbF designs, and to use early warnings and early actions to help people prepare and withstand disasters such as dzuds. 相似文献
15.
16.
Rosario Perez Espejo 《Environment, Development and Sustainability》2006,8(3):391-411
The objective of this article is to address the environmental costs of pig farms in the La Piedad region Mexico, through an
analysis of the standard on wastewater discharges to national water bodies. Field work was carried out from April to September
1999; a survey was conducted on 23 farms and samples of wastewater were taken on 11 farms. Pig production is the third most
important system in Mexican livestock production. Heterogeneity in production systems, dependence on imported inputs (genetics
and feed grains), and weak internalization of environmental costs are the main characteristics of pig production in Mexico.
With no specific environmental regulations on intensive livestock activities at the municipal or state levels, Mexican Official
Standard 001 on wastewater discharges is the only environmental obligation that pig farms must meet. Standard 001 on wastewater
contains the maximum permissible limits for 20 contaminant parameters, and is based on a cost-benefit analysis that points
to secondary treatment for the regulation’s economic viability. Investment in treatment systems and the fees that pig producers
must pay when they fail to comply with the limits stipulated in the regulation, are estimated assessed as an approach to environmental
costs. In order to remain within the limits in the standard, pig farms must invest in tertiary treatment, and that makes meeting
the standard unaffordable for this sector. 相似文献
17.
Canopy profiles of photosynthetic parameters under elevated CO2 and N fertilization in a poplar plantation 总被引:1,自引:0,他引:1
Calfapietra C Tulva I Eensalu E Perez M De Angelis P Scarascia-Mugnozza G Kull O 《Environmental pollution (Barking, Essex : 1987)》2005,137(3):525-535
A poplar plantation has been exposed to an elevated CO2 concentration for 5 years using the free air CO2 enrichment (FACE) technique. Even after such a long period of exposure, leaves of Populus x euramericana have not shown clear signs of photosynthetic acclimation. Only at the end of the growing season for shade leaves was a decrease of maximum velocity of carboxylation (Vcmax) observed. Maximum electron transport rate (Jmax) was increased by FACE treatment in July. Assimilation rates at CO2 partial pressure of 400 (A400) and 600 (A600) micromol mol(-1) were not significantly different under FACE treatment. Most notably FACE significantly decreased stomatal conductance (g(s)) both on upper and lower canopy leaves. N fertilization increased N content in the leaves on mass basis (Nm) and specific leaf area (SLA) in both CO2 treatments but did not influence the photosynthetic parameters. These data show that in poplar plantations the long-term effects of elevated CO2 on photosynthesis do not differ considerably from the short-term ones even with N deposition. 相似文献
18.
Joseph M. Perez 《Environment international》1981,5(4-6)
Development of analytical capabilities to evaluate unregulated emissions are discussed. The sampling and analysis methods along with some problem areas are included. Results obtained on three heavy-duty diesel engines are reported. Emphasis was placed on analysis of the particulate fraction including the solvent extractable material. Preliminary experiments suggest appreciable quantities of organic extract and BaP pass through the primary filter. Other species analyzed to obtain a baseline for emission reduction research included aldehydes, sulfates, sulfur dioxide, ammonia, hydrogen sulfide, and hydrogen cyanide. Of primary concern is the proper assessment of the results. 相似文献
19.
To determine the general palatability of autotrophic dinoflagellates to newly hatched crab larvae and whether there are taxonomic, predator/prey size relationships, or toxicity components to their ability to discriminate among dinoflagellates, larvae of six species of crabs from two families were fed 16 species/strains of dinoflagellates from three orders. Dinoflagellate cell length ranged from 18 to 50 µm, and toxic and non-toxic species/strains were included. Experiments measuring incidence of prey ingestion, grazing rates on individual constituents of selected prey combinations, and development on one toxic species shown to be readily ingested were conducted between 2000 and 2002. Thirteen of sixteen dinoflagellates were palatable to larvae, with no consistent pattern of prey discrimination based on taxonomic affinity, toxicity, larval hatching season, or predator/prey size relationships. Although the three dinoflagellates not ingested were toxic, three other toxic species/strains were ingested, with accelerated mortality occurring in the one case. Ingestion of non-favored prey occurred only at very low rates when mixed with readily ingested prey, indicating selectivity. Larvae hatching in winter generally ingested dinoflagellates as readily as did zoeae hatched in spring and summer. Newly hatched larvae ingested a wide variety of dinoflagellates, while discriminating among related species. Such discrimination will not always prevent larval ingestion of prey that will result in mortality.Communicated by J.P. Grassle, New Brunswick 相似文献
20.