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排序方式: 共有484条查询结果,搜索用时 484 毫秒
221.
Ana Vicente Ana Calvo Ana P. Fernandes Teresa Nunes Cristina Monteiro Casimiro Pio Célia Alves 《环境科学学报(英文版)》2017,29(3):122-131
In summer 2010, twenty eight(14 PM_(2.5)samples plus 14 samples PM_(2.5–10)) smoke samples were collected during wildfires that occurred in central Portugal. A portable high-volume sampler was used to perform the sampling, on quartz fibre filters of coarse(PM_(2.5–10)) and fine(PM_(2.5)) smoke samples. The carbonaceous content(elemental and organic carbon) of particulate matter was analysed by a thermal–optical technique. Subsequently, the particulate samples were solvent extracted and fractionated by vacuum flash chromatography into three different classes of organic compounds(aliphatics, polycyclic aromatic hydrocarbons(PAHs) and carbonyl compounds). The organic speciation was performed by gas chromatography–mass spectrometry(GC–MS). Emissions were dominated by the fine particles, which represented around 92% of the PM_(10). A clear predominance of carbonaceous constituents was observed, with organic to elemental carbon(OC/EC)ratios ranging between 1.69 and 245 in both size fractions. The isoprenoid ketone6,10,14-trimethyl-2-pentadecanone, a tracer for secondary organic aerosol formation, was one of the dominant constituents in both fine and coarse particles. Retene was the most abundant compound in all samples. Good correlations were obtained between OC and both aliphatic and PAH compounds. Pyrogenic processes, thermal release of biogenic compounds and secondary processing accounted for 97% of the apportioned PM_(2.5)levels. 相似文献
222.
Susanna Piovano Marcel Clusa Carlos Carreras Cristina Giacoma Marta Pascual Luis Cardona 《Marine Biology》2011,158(11):2577-2587
We estimated for the first time the growth rates of loggerhead sea turtles of Mediterranean and of Atlantic origin found in
the Mediterranean Sea, combining both skeletochronological and genetic analyses. Our growth models suggested that the growth
rate of loggerhead sea turtles of Mediterranean origin was faster than that of their conspecifics with an Atlantic origin
exploiting the feeding grounds in the Mediterranean Sea. The age at maturity for Mediterranean origin loggerhead sea turtles,
estimated using our best fitting model, was 24 years, which suggests that loggerhead sea turtles nesting in the Mediterranean
are not only smaller than those nesting in the western North Atlantic but also younger. 相似文献
223.
Cristina?M.?GomesEmail author Christophe?Boesch 《Behavioral ecology and sociobiology》2011,65(11):2183-2196
Why do animals help other individuals and provide benefits to the recipient, sometimes at personal cost? In this study, we aim to determine if some of the helpful behaviors observed in a group of wild chimpanzees (Taï chimpanzee group, Côte d'Ivoire, West Africa) are exchanged among individuals resulting in a net benefit for both participants. We adopted an inclusive view of exchanges by considering that all commodities (i.e., social behaviors as grooming, sex, support, as well as resources, such as meat) can be exchanged. This would result in “market” type social interactions in which debts of one commodity can be met by giving the same or other commodities. We investigated whether both in-kind exchanges and trades of commodities occurred. The Taï chimpanzees reciprocated the amount of grooming they received and were more likely to give support in agonistic conflicts to those who also supported them. In addition, they traded support for meat and meat for sex. Both male and female chimpanzees exchanged many different commodities, which seemed to result in long-term balanced relationships. Our results suggest that wild chimpanzees rely on other group members to obtain many of the important commodities they need. 相似文献
224.
Muñoz-Morales Martín Castañeda-Juárez Montse Souza Fernanda Lourdes Saez Cristina Cañizares Pablo Martínez-Miranda Verónica Linares-Hernández Ivonne Rodrigo Manuel Andrés 《Environmental science and pollution research international》2021,28(19):23657-23666
Environmental Science and Pollution Research - This work focuses on the development of electro-absorption and photoelectro-absorption technologies to treat gases produced by a synthetic waste... 相似文献
225.
García-Cambero Jesús Pablo Corpa Cristina Lucena Miguel Angel Méndez Paloma Sierra Pilar Galán-Madruga David Aguayo Sonia 《Environmental science and pollution research international》2021,28(36):49921-49935
Environmental Science and Pollution Research - Diclofenac (DCF), 17-β-estradiol (E2), and 17-α-ethinylestradiol (EE2) are emerging pollutants included in the first watch list agreed by... 相似文献
226.
Delgado-Alvarez Carolina Guadalupe Ruelas-Inzunza Jorge Osuna-Martínez Carmen Cristina Bergés-Tiznado Magdalena Elizabeth Escobar-Sánchez Ofelia Ocampo-Rodríguez Pedro Octavio Soto-Romero Karen Lizbeth Garzón-Raygoza Nancy Lorena Aguilar-Júarez Marisela Osuna-López José Isidro Frías-Espericueta Martín 《Environmental science and pollution research international》2021,28(9):10909-10917
Environmental Science and Pollution Research - Mercury and selenium concentrations and Se:Hg molar ratio in edible muscle and hepatopancreas of the crab Callinectes arcuatus from coastal lagoons of... 相似文献
227.
Prado Tatiana Barbosa Mikaela Renata Funada Araújo Ronalda Silva Garcia Suzi Cristina Melo Adalgisa Jesus Galvani Ana Tereza Brandão Carlos Jesus Silva Renan Lourenço Oliveira Sato Maria Inês Zanoli 《Food and environmental virology》2021,13(4):520-527
Food and Environmental Virology - Hepatitis A virus (HAV) is the major cause of enterically transmitted infectious hepatitis. Between 2016 and 2017, the number of confirmed cases of hepatitis A... 相似文献
228.
Roberto Danovaro Mariaspina Scopa Cristina Gambi Simonetta Fraschetti 《Marine Biology》2007,152(2):339-350
In coastal marine ecosystems, predation might affect spatial distribution and population dynamics of benthic assemblages.
Here, by means of experimental exclusion of potential predators, we compared the effects of epibenthic predation on metazoan
meiofaunal assemblages on soft and rocky substrates. Different patterns of abundance were observed in uncaged versus caged
plots, across habitats. In caged soft substrates, the abundance of Nematodes, Copepods and Polychaetes increased by 56, 45,
57%, respectively, in the first 3 months. An increase in the number of meiofaunal taxa was also observed. The exclusion of
predators from rocky substrates showed less clear patterns. It did not affect the number of taxa while a decrease in meiofaunal
abundance was observed. Our results suggest that the exclusion of epibenthic predators had clear effect on total metazoan
meiofaunal abundance and on the number of taxa, only in soft bottoms. The different impact of predation across habitats can
be potentially explained by differences in terms of spatial variability and substrate complexity. We estimated that, coarsely,
more than 75% of total metazoan meiofaunal production can be channeled to higher trophic levels through predation on soft-bottoms.
Among meiofaunal taxa, Polychaetes and Nematodes provided the major contribution to benthic energy transfers. These results
suggest the trophic relevance of metazoan meiofauna in coastal food webs and claim for the refinement of further experiments
for the quantification of its role in different ecological systems. 相似文献
229.
A 3-year monitoring of dissolved and particulate carbohydrate concentrations in four transects located in the Adriatic and Tyrrhenian Seas was performed in order to get information on the role played by carbohydrates in the mucilage formation in these areas. The application of time series analysis pointed out that the concentration of dissolved carbohydrates does not vary significantly in coincidence of the mucilage appearance showing an almost constant state with respect to time. In contrast, wider temporal variations of carbohydrate amounts, either increase or decrease, were observed when mucilages were lacking or reduced. This almost constant state of carbohydrate amounts observed in presence of mucilages that we define 'steady state' could be associated to an alteration of the complex chemical equilibrium between synthesis and degradation (either hydrolysis or oxidation) reactions of the organic polymers which are typical of the humification processes in the marine environment. The results of this study suggest that the monitoring of carbohydrates can represent an useful tool for the comprehension of the most relevant phenomena of mucilage appearance in the Northern Adriatic Sea. 相似文献
230.
Raffaella Tolotti Sirio Consani Cristina Carbone Greta Vagge Marco Capello Laura Cutroneo 《环境科学学报(英文版)》2019,31(1):233-246
Environmental contamination has become a global problem of increasing intensity due to the exponential growth of industrialization. One main debated issue is the metal contamination of rivers receiving Acid Mine Drainage (AMD) from active/abandoned mines. In order to assess the quality of lotic systems, diatoms are commonly used, as their assemblage modifies on the basis of changes in environmental parameters. Benthic diatom changes were analyzed along the metal-impacted Gromolo Torrent (Liguria, NW Italy) with the aim of understanding the effects of input from the abandoned Libiola Cu mine. The results support the hypothesis that metals from AMD lead to massive changes in diatoms, resulting in low biological diversity and in a shift of dominance, passing from the genera Cymbella and Cocconeis to more tolerant and opportunistic species, such as Achnanthidium minutissimum and Fragilaria rumpens. The high concentrations of labile metals, measured through Diffusion Gradients in Thin-films (DGT) immediately downstream of the two AMD inputs in the torrent, corresponded to a sudden decrease in the presence of diatoms, indicating the possible reaching of acute toxic levels. In particular, A. minutissimum dominated the mining area and was positively correlated with Cu and Zn; whereas F. rumpens bloomed downstream of this area, where the metal content was diluted, and was positively correlated with As and Pb. Finally, an important abundance of Nitzschia palea and teratological forms of A. minutissimum and F. rumpens were observed downstream from the mine, indicating that metals may have an important impact on diatoms up to the torrent mouth. 相似文献