Consuming space. Placing consumption in perspective – Edited by Michael K Goodman,David Goodman and Michael Redclift     

Juliana Mansvelt 《New Zealand geographer》2011,67(3):228-229

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Floods control the influence of environmental gradients on the diversity of zooplankton communities in a neotropical floodplain     

Nadson Ressyé Simões  Juliana Déo Dias  Clarice Maria Leal  Louizi de Souza Magalhães Braghin  Fábio Amodêo Lansac-Tôha  Cláudia Costa Bonecker 《Aquatic Sciences - Research Across Boundaries》2013,75(4):607-617

Floodplains show a high biodiversity due to their spatial heterogeneity and temporal variability, which are governed by environmental dynamics resulting from the flood pulse. We evaluated the importance of this driving force, the flood pulse, in the structuring of environmental gradients that influence species diversity in a neotropical floodplain. Gamma (γ) and alpha (α) zooplankton diversities were higher in the year with a typical flood pulse (2010), indicating that flood dynamics contributed to high diversity component values. We found significant relationships between α- and β-diversity and local environmental gradients, indicating that in years with a flood pulse, environmental filters might be the dominant mechanisms that structure the zooplankton community. Additive partitioning of γ-diversity showed that even in 2000 with atypical flood conditions, zooplankton diversities showed non-random patterns of spatial distribution and temporal variation in the floodplain. Our results indicate that the driving force of a floodplain can determine the spatial distribution of α- and β-diversity of aquatic communities owing to its primary effect on environmental filters. Therefore, if human activities that influence this driving force, such as water regulation, affect those environmental filters, floodplain biodiversity may decline.  相似文献   

Tourism Today: A Geographical Analysis by Douglas Pearce     

Juliana Mansvelt 《New Zealand geographer》1998,54(2):55a-56

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Evolution of the deep Atlantic water masses since the last glacial maximum based on a transient run of NCAR-CCSM3     

Juliana M. Marson  Lawrence A. Mysak  Mauricio M. Mata  Ilana Wainer 《Climate Dynamics》2016,46(3-4):865-877

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Trace metal distribution in white shrimp (<Emphasis Type="Italic">Litopenaeus schmitti</Emphasis>) tissues from a Brazilian coastal area     

Juliana Ribeiro Nascimento  Edison Dausacker Bidone  Denise Rolão-Araripe  Karina Annes Keunecke  Elisamara Sabadini-Santos 《Environmental Earth Sciences》2016,75(11):990

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Temporal variation and patchiness of zooplankton around a restored oyster reef     

Juliana M. Harding 《Estuaries and Coasts》2001,24(3):453-466

Zooplankton abundance and distribution patterns were determined for six seasonally important invertebrate taxa (bivalve veligers, gastropod veligers, polychaete larvae, barnacle nauplii, calanoid copepod adults and nauplii) and a diurnally important taxon (decapod zoea) around a restored oyster reef in the Piankatank River, Virginia. Data were collected on spatial scales of hundreds of meters and seasonal (May through October), diel (day-night), and tidal (3 h) temporal scales. Significant seasonal and diel patterns in abundance were observed for all taxa. Tidal influences alone appear to be less important than seasonal and diel patterns for most taxa but the interation of tidal and diel cues may have caused the observed diel zooplankton distribution patterns in both June and August 1996. Zooplankton taxa around the oyster reef were distributed non-randomly (patchily) regardless of their horizontal location with regard to the reef. Seasonal pulses in zooplankton abundance relate directly to life history patterns and reproductive cycles for individual taxa. Reef benthic fauna have the capacity to directly influence the composition and absolute abundance of the overlying zooplankton community and indirectly influence oyster reef community trophic dynamics.  相似文献   

Reproductive biology and embryonic development of Centroscymnus coelolepis in Portuguese mainland waters     

Verissimo  Ana; Gordo  Leonel; Figueiredo  Ivone 《ICES Journal of Marine Science》2003,60(6):1335-1341

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Separating soil and leaf water O isotopic signals in plant stem cellulose     

Leonel da Silveira Lobo Sternberg  William T. Anderson 《Geochimica et cosmochimica acta》2003,67(14):2561-2566

The oxygen-18 signal of soil and leaf water are both recorded in heterotrophically synthesized plant stem cellulose. Presently, these signals can only be teased apart with modeling and assumptions on the nature of the isotopic enrichment of leaf water. A method by which these two signals are chemically separated and analyzed is tested here. Heterotrophically synthesized cellulose from germinating seeds having a mixture of isotopic signals from the reserve carbohydrate (starch) and that of the water during cellulose synthesis was hydrolyzed and the resulting glucose converted to glucose phenylosazone. The analysis of the ¹⁸O/¹⁶O ratios of cellulose and of glucose phenylosazone were used to calculate the oxygen isotope ratio of the oxygen attached to the second carbon of the glucose moieties of the cellulose molecule. The calculated δ¹⁸O value of this oxygen was highly correlated with that of the water available for cellulose synthesis showing a nearly one-to-one relationship (slope = 1.027) and leading to the conclusion that it completely exchanges with water during heterotrophic cellulose synthesis. Once this method is refined so as to increase precision, it will be possible to derive the δ¹⁸O values of soil water available to plants from the oxygen isotope analysis of stem cellulose and its derivative.  相似文献   

Mapping urban risk: Flood hazards,race, & environmental justice in New York     

Juliana Maantay  Andrew Maroko 《Applied geography (Sevenoaks, England)》2009,29(1):111-124

This paper demonstrates the importance of disaggregating population data aggregated by census tracts or other units, for more realistic population distribution/location. A newly developed mapping method, the Cadastral-based Expert Dasymetric System (CEDS), calculates population in hyper-heterogeneous urban areas better than traditional mapping techniques. A case study estimating population potentially impacted by flood hazard in New York City compares the impacted population determined by CEDS with that derived by centroid-containment method and filtered areal-weighting interpolation. Compared to CEDS, 37% and 72% fewer people are estimated to be at risk from floods city-wide, using conventional areal weighting of census data, and centroid-containment selection, respectively. Undercounting of impacted population could have serious implications for emergency management and disaster planning. Ethnic/racial populations are also spatially disaggregated to determine any environmental justice impacts with flood risk. Minorities are disproportionately undercounted using traditional methods. Underestimating more vulnerable sub-populations impairs preparedness and relief efforts.  相似文献   

Long-term trends of polychlorinated biphenyls and chlorinated pesticides in franciscana dolphin (Pontoporia blainvillei) from Southern Brazil     

Juliana Leonel  Jose L. Sericano  Eduardo Secchi 《Marine pollution bulletin》2010,60(3):412-418

Selected POPs were analyzed in blubber samples of Pontoporia blainvillei from Southern Brazil to appraise temporal trend over a 10 year period (1994-2004). Overall, levels of POPs were relatively low, especially when compared to Northern Hemisphere concentrations. Apart from Mirex and PCBs, which showed stable concentrations, DDTs, HCB, CHLs, Dieldrin levels presented a slight decrease over the studied period. In addition, the increase in the PCBs/DDTs ratio supports the idea that inputs of DDTs are decaying faster than PCBs.  相似文献