scholarly journals Temporal scaling of long-term co-occurring agricultural contaminants and the implications for conservation planning

Author(s):  
Xiuyu Liang ◽  
Keith Schilling ◽  
Christopher Jones ◽  
Youkuan Zhang
Atmosphere ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 331 ◽  
Author(s):  
Chunqiong Liu ◽  
Kai Shi ◽  
Jian Liang ◽  
Hongliang Huang

Based on the 19 year observation from 1998 to 2016 at the Tsuan Wan and Central/Western District monitoring stations in Hong Kong, the aim of this paper was to assess the wet deposition pathway of Benzo(a)pyrene (BaP) on a large time-scale. In order to achieve this goal, multi-fractal detrended cross-correlation analysis (MF-DCCA) was used to characterize the long-term cross-correlations behaviors and multi-fractal temporal scaling properties between BaP (or PM2.5) and precipitation. The results showed that the relationships between BaP and precipitation (or PM2.5) displayed long-term cross-correlation at the time-scale ranging from one month to one year; no cross-correlation between each other was observed in longer temporal scaling regimes (greater than one year). These results correspond to the atmospheric circulation of the Asian monsoon system and are explained in detail. Similar dynamic processes of the wet deposition of BaP and PM2.5 suggested that the main removal process of atmospheric BaP was rainfall deposits of PM2.5-bound BaP. Furthermore, cross-correlations between BaP (or PM2.5) and precipitation at the long time-scale have a multi-fractal nature and long-term persistent power-law decaying behavior. The temporal evolutions of the multi-fractality were investigated by the approach of a sliding window. Based on the evolution curves of multi-fractal parameters, the wet deposition pathway of PM2.5-bound BaP is discussed. Finally, the contribution degree of wet deposition to PM2.5-bound BaP was derived from the coefficient of determination. It was demonstrated that about 45% and 60% of atmospheric BaP removal can be attributed to the wet deposition pathway of PM2.5-bound BaP for the Tsuan Wan and Central/Western District areas, respectively. The findings in this paper are of great significance for further study on the removal mechanism of atmospheric BaP in the future. The MF-DCCA method provides a novel approach to assessing the geochemical cycle dynamics of BaP.


Author(s):  
Emad Kaky

Abstract. Kaky E. 2020. Potential habitat suitability of Iraqi amphibians under climate change. Biodiversitas 21: 731-742. Biodiversity management and conservation planning are two techniques for reducing the rate of biodiversity loss, especially under the effect of climate change. Here 289 records of five species of amphibians from Iraq and seven environmental variables were used with MaxEnt to predict potential habitat suitability for each species under current and future conditions, using the 5th IPCC assessment  (RCP 2.6 and RCP 8.5 for the year 2050). The models suggest that annual precipitation and the mean temperature of the wettest quarter are the main factors that shape the distributions of these species. The estimated current habitat suitability was closely similar to that for 2050 under both scenarios, with a high niche overlap between them for all species. Among species, there were low niche overlaps between the frogs Bufo viridis, Hyla savignyi and Rana ridibunda, and also between the salamanders Neurergus crocatus and Neurergus microspilotus. Future sampling should focus on areas not currently covered by records to reduce bias. The results are a vital first step in long-term conservation planning for these species. Via sharing these results with decision-makers and stakeholders a crucial conservation actions need to increase Iraqi Protected Areas to avoid losing biodiversity in Iraq especially the unique populations and threaten species.


2006 ◽  
Vol 43 (2) ◽  
pp. 313-324 ◽  
Author(s):  
MARION PFEIFER ◽  
KERSTIN WIEGAND ◽  
WOLFGANG HEINRICH ◽  
GOTTFRIED JETSCHKE

2022 ◽  
Vol 119 (3) ◽  
pp. e2116691118
Author(s):  
Shubhi Sharma ◽  
Robert Andrus ◽  
Yves Bergeron ◽  
Michal Bogdziewicz ◽  
Don C. Bragg ◽  
...  

Tree fecundity and recruitment have not yet been quantified at scales needed to anticipate biogeographic shifts in response to climate change. By separating their responses, this study shows coherence across species and communities, offering the strongest support to date that migration is in progress with regional limitations on rates. The southeastern continent emerges as a fecundity hotspot, but it is situated south of population centers where high seed production could contribute to poleward population spread. By contrast, seedling success is highest in the West and North, serving to partially offset limited seed production near poleward frontiers. The evidence of fecundity and recruitment control on tree migration can inform conservation planning for the expected long-term disequilibrium between climate and forest distribution.


2011 ◽  
Vol 2 (6) ◽  
pp. 682-890 ◽  
Author(s):  
Adam S. Davis ◽  
Daniel Daedlow ◽  
Brian J. Schutte ◽  
Paula R. Westerman

F1000Research ◽  
2015 ◽  
Vol 3 ◽  
pp. 91 ◽  
Author(s):  
Rebecca Weeks ◽  
Robert L. Pressey ◽  
Joanne R. Wilson ◽  
Maurice Knight ◽  
Vera Horigue ◽  
...  

Systematic conservation planning increasingly underpins the conservation and management of marine and coastal ecosystems worldwide. Amongst other benefits, conservation planning provides transparency in decision-making, efficiency in the use of limited resources, the ability to minimise conflict between diverse objectives, and to guide strategic expansion of local actions to maximise their cumulative impact. The Coral Triangle has long been recognised as a global marine conservation priority, and has been the subject of huge investment in conservation during the last five years through the Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security. Yet conservation planning has had relatively little influence in this region. To explore why this is the case, we identify and discuss 10 challenges that must be resolved if conservation planning is to effectively inform management actions in the Coral Triangle. These are: making conservation planning accessible; integrating with other planning processes; building local capacity for conservation planning; institutionalising conservation planning within governments; integrating plans across governance levels; planning across governance boundaries; planning for multiple tools and objectives; understanding limitations of data; developing better measures of progress and effectiveness; and making a long term commitment. Most important is a conceptual shift from conservation planning undertaken as a project, to planning undertaken as a process, with dedicated financial and human resources committed to long-term engagement.


2013 ◽  
Vol 21 (5-6) ◽  
pp. 175-180 ◽  
Author(s):  
George N. Frantziskonis

AbstractTemporal scaling in mechanical strength of materials is vital for long-term effects such as fatigue. The fatigue crack length α is related to the change in the stress intensity factor ΔK by the omnipresent Paris’s law, which works well for cyclic fatigue of specific frequency and amplitude. The paper considers time scaling in fatigue and through it incorporates the effects of temporal events such as unexpected or accidental loads, impact loads, and rare events such as earthquake loads. This is achieved by theoretically incorporating the effects of delta-function type loads into fatigue. Since the time-scale decomposition of such a load contains information at all scales, the theoretical framework is easily extended to include general types of loads.


2021 ◽  
Vol 13 (6) ◽  
pp. 18614-18617
Author(s):  
Iqram ul Haq ◽  
Bilal A. Bhat ◽  
Khursheed Ahmad ◽  
Asad R. Rahmani

A field study was carried out for the first time in Kashmir Valley to investigate the population status and distribution of Ibisbill.  The initial reconnaissance surveys conducted across Kashmir Valley, indicated that the Lidder River in district Anantnag and Sindh River in district Ganderbal harbor populations of Ibisbill.  During the intensive study carried out in the river Sindh from September 2017 to August 2018, the mean population size was maximum (36±8.63) at Stretch I and minimum (3±1.35) at stretch II.  The seasonal population of Ibisbill was maximum (25.66±18.44) in the autumn and minimum (10±9.35) in the winter.  The present study indicated that river Sindh provides an ideal habitat for Ibisbill, and was most widely used by the bird.  We recommend further intensive research studies on the lesser known aspects of ecology and biology of this enigmatic species for long term conservation planning in the region. 


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