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141.
Caumo Sofia Yera Aleinnys B. Vicente Ana Alves Célia Roubicek Deborah A. de Castro Vasconcellos Pérola 《Environmental science and pollution research international》2022,29(21):31293-31310
Environmental Science and Pollution Research - Increased industrialization and consumption of fossil fuels in the Metropolitan Region of São Paulo (MRSP), Brazil, have caused a growth of the... 相似文献
142.
Deborah J. Ballantine Desmond E. Walling Adrian L. Collins Graham J. L. Leeks 《Water, Air, & Soil Pollution: Focus》2006,6(5-6):371-380
Deposition and storage of fine sediment on channel beds represents an important component of a catchment’s sediment budget
and can have important implications for sediment-associated P fluxes, due to storage and remobilisation, and for P concentrations
through water–sediment interactions. Spatial and temporal variations in P content and storage in fine bed sediment have been
studied in two UK lowland catchments, the Rivers Frome and Piddle in Dorset. Fine bed sediment was sampled in representative
reaches on a bi-monthly basis using a re-suspension cylinder, and the resulting samples were analysed for total P, a range
of P fractions and particle size. The results demonstrate significant spatial and temporal variability in PP concentrations
and storage, with maximum and minimum P concentrations and storage occurring in late summer and winter, respectively. Temporal
variations in concentrations reflect residence times of the sediment and ambient P concentrations, while variations in storage
are mainly due to hydrological regimes. Spatial variations reflect catchment characteristics, the location of inputs and local
variations in hydrological and channel bed conditions. 相似文献
143.
Zannè Zeeman George M. Branch Daniel Farrell Gavin W. Maneveldt Deborah Robertson-Andersson Deena Pillay 《Marine Biology》2013,160(1):107-117
This paper concerns the effects on biodiversity of depletion of the South African abalone Haliotis midae, which is a long-lived species with a large corrugated shell that provides a habitat for diverse benthic organisms. We compared community structure on H. midae shells with that on adjacent rock at three sites (Cape Point and Danger Point sites A and B) and at two different times of the year at one of these sites. Shells of H. midae consistently supported communities that were distinctly different from those on rock. In particular, three species of non-geniculate (encrusting) corallines, Titanoderma polycephalum, Mesophyllum engelhartii and Spongites discoideus, were all found either exclusively or predominantly on shells, whereas another non-geniculate coralline, Heydrichia woelkerlingii, occurred almost exclusively on adjacent rock. The primary rocky substratum, however, supported a higher number of species than abalone shells. Possible reasons for the differences between the two substrata include the relative age, microtopography and hardness of the substrata; the abundance of grazers on them; and the relative age of different zones of the abalone shell, which support communities at different stages of succession. Diversity on shells was lowest in zones that were either very young or very old, in keeping with the intermediate disturbance hypothesis. The distinctiveness of shell epibiota will increase β diversity despite having a lower α diversity than that of adjacent rock. Decimation of H. midae by overfishing therefore has implications for biodiversity conservation. 相似文献
144.
William S. Linn Edward L. Avol Deborah A. Shamoo Jill D. Whynot Karen R. Anderson Jack D. Hackney 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1323-1328
Young asthmatic adult volunteers (N = 27) were exposed in an environmental chamber to sulfuric acid aerosol at concentrations near 0, 122, 242, and 410 μg/m3, in purified background air at 22° C and 50 percent relative humidity. The polydisperse aerosol had a mass median aerodynamic diameter near 0.6 μm. Exposures occurred in random order at one-week intervals. Each lasted 1 h, during which subjects exercised (mean ventilation 42 L/min) and rested during alternate 10-min periods. Specific airway resistance and forced expiratory function were measured pre-exposure, after the initial exercise, and at end-exposure. Bronchial reactivity was determined by challenge with cold air immediately post-exposure. Symptoms were monitored during exposure for one week afterward. Exercise-induced bronchospasm was observed under all conditions. Physiologic and symptom changes possibly attributable to sulfuric acid exposure were small and not statistically significant. Our largely negative results contrast with positive findings elsewhere at lower acid doses. Possible explanations include different clinical characteristics of subjects and different routes of breathing. 相似文献
145.
Fabiola Quintero-Rivera Caroline D. Robson Rosemary E. Reiss Deborah Levine Carol Benson John B. Mulliken Virginia E. Kimonis 《黑龙江环境通报》2006,26(10):966-972
Apert syndrome was diagnosed in a newborn with typical facial and digital features whose only detected prenatal abnormality had been agenesis of the corpus callosum. This prompted a review of the central nervous system findings in all cases of Apert syndrome treated at the Craniofacial Center Boston Children's Hospital between 1978 and 2004. Two of 30 patients with Apert syndrome had prenatal identification of mild dilatation of the lateral cerebral ventricles and complete agenesis of the corpus callosum (ACC) documented with both ultrasound and MRI. Both had the common S252W mutation of FGFR2. Though cranial and orbital malformations typical of Apert were eventually seen in these fetuses in the third-trimester, even in retrospect, these were not detectable at mid second-trimester, ultrasound screening for congenital malformations. Hand malformations also went undetected in the second-trimester despite extensive imaging by experienced radiologists. We conclude that prenatal ultrasonographic identification of mild ventriculomegaly or ACC should stimulate a careful search for features of Apert syndrome and prompt follow-up imaging to look for bony abnormalities that have later onset. Prenatal molecular testing for Apert mutations should be considered in cases of mild ventriculomegaly and ACC. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
146.
147.
How resources and encounters affect the distribution of foraging activity in a seed-harvesting ant 总被引:3,自引:0,他引:3
We examined how the foraging ecology of the seed-harvesting ant Messor andrei depends upon the distribution of resources and the presence of conspecifics. Bait experiments showed that colonies can recruit
to high-density patches of seeds. However, at the seasonal scale, natural resource distribution did not affect the distribution
of foraging activity. We conducted the study in years of high rainfall and thus seed availability may not have been a limiting
factor. Colonies always preferred to forage in areas closer to their nest, which may reduce travel time between the nest and
foraging sites. On a day-to-day scale, encounters between neighboring colonies at a site increased the probability that colonies
would return to forage at that site; this was true both for natural and experimental encounters. In the summer, this resulted
in colonies foraging at the sites of intraspecific encounters on more days than in areas where no encounter had occurred.
Encounters between colonies included fighting, and there was little overlap between the foraging areas of neighboring colonies:
both results suggest that one function of encounters is to defend foraging space. The high probability of return to the site
of an encounter between colonies suggests that encounters may have a second function: to indicate the presence of resources.
Received: 28 June 1999 / Received in revised form: 12 October 1999 / Accepted: 16 October 1999 相似文献
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