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Johanna J. Vollenweider Ron A. Heintz Lawrence Schaufler Robert Bradshaw 《Marine Biology》2011,158(2):413-427
Quantifying the nutritional quality of forage fish is integral for understanding upper trophic levels as forage fish are the
dominant prey for top predator fish, marine mammals, and sea birds. Many existing reports documenting body composition of
forage species are not comparable due to confounding effects. This study systematically assessed the variability in proximate
composition and energy content of 16 forage species in southeastern Alaska (57.2626 N/133.7394 W) between 2001 and 2004. Variation
in energy and lipid contents was related to habitat, epipelagic planktivores varying most, mesopelagics intermediate, and
demersal species relatively invariable. Season was the greatest source of variation as a result of short growing seasons at
high latitude and energy allocation strategies for reproduction and growth. Among species that varied seasonally, energy and
lipid increased over summer and declined during winter. Annual differences in body composition occurred during periods of
peak energy content. Sampling recommendations and guidance for bioenergetics models are provided. 相似文献
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This study analyses disparities in the provision of environmental services in Jerusalem, specifically through the distribution of recycling bins. The allocation of recycling bins in Jerusalem is uneven. Some neighbourhoods have more than their share of infrastructure, while others do not have any recycling bins at all. The spatial distribution of recycling bins throughout the city is analysed across the ethno-religious and socioeconomic divides, enabling us to determine whether the opportunity to recycle is a right or a privilege. The findings demonstrate that the Arab areas are literally not serviced. Ultra-Orthodox (Haredi) Jewish neighbourhoods are discriminated against unless socioeconomic levels and population size are controlled. Therefore, waste-management policies reproduce social inequalities resulting in environmental injustice. Due to the fact that recycling in Jerusalem is voluntary and not obligatory, and that in general the public wants to recycle, the opportunity to recycle is indeed a privilege. 相似文献
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Kaitlin M. Gallagher 《International journal of occupational safety and ergonomics》2016,22(4):580-586
During their commute, pedestrians encounter a variety of staircase designs. One such design is the oblique staircase that allows pedestrians to descend at an angle. The purpose of this study was to assess the influence of an oblique path of descent on heel and toe clearance, and toe placement on a step. Sixteen participants descended a staircase on an angled path at three angles: 0° (perpendicular), 25°, and 45°. Toe placement and foot clearances were compared between the descent angles and feet. An increase in descent angle demonstrated increased clearance of the heel apex compared with straight descent; however, the aspect of the foot closest to the stair changes in angled descent, moving from the apex to the side of the heel. A greater portion of the foot was placed on the stair tread during angled descent. Future work should address the influence of angled descent on fall risk. 相似文献
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Huan Feng Yu Qian Frank J. Gallagher Weiguo Zhang Lizhong Yu Changjun Liu Keith W. Jones Ryan Tappero 《环境科学学报(英文版)》2016,28(3):172-182
Liberty State Park in New Jersey,USA,is a "brownfield" site containing various levels of contaminants.To investigate metal uptake and distributions in plants on the brownfield site,Phragmites australis and Typha latifolia were collected in Liberty State Park during the growing season(May–September)in 2011 at two sites with the high and low metal loads,respectively.The objective of this study was to understand the metal(Fe,Mn,Cu,Pb and Zn)concentration and spatial distributions in P.australis and T.latifolia root systems with micro-meter scale resolution using synchrotron X-ray microfluorescence(μXRF)and synchrotron X-ray computed microtomography(μCMT)techniques.The root structure measurement by synchrotron μCMT showed that high X-ray attenuation substance appeared in the epidermis.Synchrotron μXRF measurement showed that metal concentrations and distributions in the root cross-section between epidermis and vascular tissue were statistically different.Significant correlations were found between metals(Cu,Mn,Pb and Zn)and Fe in the epidermis,implying that metals were scavenged by Fe oxides.The results from this study suggest that the expression of metal transport and accumulation within the root systems may be element specific.The information derived from this study can improve our current knowledge of the wetland plant ecological function in brownfield remediation. 相似文献
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Henseler Martin Gallagher Micheal Bernard Kreins Peter 《Environmental Modeling and Assessment》2022,27(4):553-569
Environmental Modeling & Assessment - Microplastic pollution in soils is a recent environmental problem and the lack of knowledge about the impacts and the extent of the problem are raising... 相似文献