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991.
Syed Ali-Musstjab-Akber-Shah Eqani Riffat Naseem Malik Ashiq Mohammad 《Environmental geochemistry and health》2011,33(1):33-47
Organochlorine pesticides (OCPs), viz. β-hexachlorocyclohexane (β-HCH), γ-HCH, aldrin, dieldrin, endrin, heptachlor, endosulfan-I,
endosulfan-II, heptachlor endoepoxide, heptachlor exoepoxide, mirex, dicofol, o,p′-dichlorodiphenyltrichloroethane (o,p′-DDT), p,p′-dichlorodiphenyltrichloroethane (p,p′-DDT), dichlorodiphenyldichloroethane (DDD), and dichlorodiphenyltrichloroethylene (DDE) and 12 other physicochemical parameters
were measured in surface sediments from River Chenab during two sampling seasons (summer and winter, 2007) to evaluate spatial
and temporal trends of sediment pollution. Hierarchical agglomerative cluster analysis identified three groups of sites based
on spatial similarities in physicochemical parameters and OCP residual concentrations. Spatial discriminant function analysis
(DFA) segregated 14 parameters, viz. dicofol, endosulfan-I, heptachlor endoepoxide, dieldrin, DDD, DDE, endosulfan-II, o,p′-DDT, p,p′-DDT, pH, electrical conductivity (EC), Cl−1, total P (%), and silt, which explained 96% of total variance between spatial groups. γ-HCH was the most frequently detected
(63%) pesticide, followed by DDD (56%). The ratio of DDTs to their metabolites indicated current input and anaerobic biodegradation.
Temporal DFA highlighted aldrin, heptachlor endoepoxide, Cl−1, total P, and EC as important variables which caused variations between summer and winter. DDTs were relatively more prevalent
as compared to other OCPs in the sediments samples during both seasons. DDT metabolites were detected at greater frequencies
and concentrations in winter, whereas DDT isomers were more prevalent in summer sediment samples. Factor analysis identified
agricultural and industrial activities as major sources of sediment OCP contamination. Concentrations of γ-HCH, heptachlor
endoepoxide, dieldrin, and DDTs (isomers and metabolites) in all sediment samples were well above interim sediment quality
guidelines (ISQGs) and probable effect limits (PEL) given by Canadian Sediment Quality Guidelines (CSQGs). 相似文献
992.
The importance of preserving both protected areas and their surrounding landscapes as one of the major conservation strategies
for tigers has received attention over recent decades. However, the mechanism of how land-use surrounding protected areas
affects the dynamics of tiger populations is poorly understood. We developed Panthera Population Persistence (PPP)—an individual-based
model—to investigate the potential mechanism of the Sumatran tiger population dynamics in a protected area and under different
land-use scenarios surrounding the reserve. We tested three main landscape compositions (single, combined and real land-uses
of Tesso-Nilo National Park and its surrounding area) on the probability of and time to extinction of the Sumatran tiger over
20 years in Central Sumatra. The model successfully explains the mechanisms behind the population response of tigers under
different habitat landscape compositions. Feeding and mating behaviours of tigers are key factors, which determined population
persistence in a heterogeneous landscape. All single land-use scenarios resulted in tiger extinction but had a different probability
of extinction within 20 years. If tropical forest was combined with other land-use types, the probability of extinction was
smaller. The presence of agroforesty and logging concessions adjacent to protected areas encouraged the survival of tiger
populations. However, with the real land-use scenario of Tesso-Nilo National Park, tigers could not survive for more than
10 years. Promoting the practice of agroforestry systems surrounding the park is probably the most reasonable way to steer
land-use surrounding the Tesso-Nilo National Park to support tiger conservation. 相似文献
993.
Riffat Naseem Malik Sidra Rauf Ashiq Mohammad Syed-Ali-Musstjab-Akber Shah Eqani Karam Ahad 《Environmental monitoring and assessment》2011,173(1-4):325-341
In this study, residual concentration of organochlorine pesticides (OCPs) in the sediments, prey, and eggs of Bubulcus ibis were measured from three breeding heronries from the Punjab province of Pakistan. Pattern of contamination in eggs followed the order: DDTs > HCHs > heptachlor > aldrin. Overall, pesticide residual concentrations were greater in eggs of cattle egrets collected from heronry on the River Ravi. Among HCHs, ??-HCH was more prevalent in eggs, whereas DDTs followed the order: DDD > DDE > p,p ??-DDT > o,p ??-DDT. Eggshell thinning was detected which showed negative relationship with residual concentration of DDE. In prey samples, residual concentration of POPs followed the order: DDTs > HCHs > dicofol > heptachlor; however, contamination pattern in sediments followed a slightly different order: DDTs > heptachlor > dicofol > HCHs > dieldrin > aldrin. Concentration of ??-HCH was more prevalent in sediments and comparatively greater concentrations of POPs were measured in sediments collected from the River Ravi. Dicofol was found for the very first time in the biological samples from Pakistan, and its concentration was measured as relatively high in eggs from heronry from the River Chenab. Residual concentrations measured in eggs were below the levels that could affect egret populations. Biomagnification of the total OCPs through the food chain was evident in three breeding heronries. The concentration of DDE measured in eggs of the cattle egret suggests the need for monitoring this contaminant in other bird species at different trophic levels. 相似文献
994.
Husain Tahir Safdar Kousar Shazia Ahmed Farhan Rizwan Ullah Muhammad 《Environmental science and pollution research international》2021,28(35):47932-47941
Environmental Science and Pollution Research - Air pollution brings uncountable serious influences on human life during the last decade. This study is an attempt to compare economic liberalism with... 相似文献
995.
Jan Amin Ullah Hadi Fazal Shah Abdullah Ditta Allah Nawaz Muhammad Asif Tariq Muhammad 《Environmental science and pollution research international》2021,28(32):43417-43430
Environmental Science and Pollution Research - Soil pollution due to potentially toxic elements is a worldwide challenge for health and food security. Chelate-assisted phytoextraction along with... 相似文献
996.
Anser Muhammad Khalid Apergis Nicholas Syed Qasim Raza Alola Andrew Adewale 《Environmental science and pollution research international》2021,28(35):48112-48122
Environmental Science and Pollution Research - Considering that the rigor of economic activities has widely been linked with the turbulent nature of the increasing global atmospheric and... 相似文献
997.
Anser Muhammad Khalid Usman Bushra Hyder Shabir Nassani Abdelmohsen A. Askar Sameh E. Zaman Khalid Abro Muhammad Moinuddin Qazi 《Environmental science and pollution research international》2021,28(36):49820-49832
Environmental Science and Pollution Research - The study’s objective is to evaluate the impact of environmental sustainability rating, financial development, changes in the price level and... 相似文献
998.
Usman Muhammad Jahanger Atif 《Environmental science and pollution research international》2021,28(28):37292-37310
Environmental Science and Pollution Research - This study investigates the heterogeneous effects of remittance inflows, institutional quality, foreign direct investment, energy consumption,... 相似文献
999.
Usman Muhammad Ho Yuh-Shan 《Environmental science and pollution research international》2021,28(14):16913-16924
Environmental Science and Pollution Research - The ongoing pandemic of the coronavirus disease 2019 (COVID-19) is a global health emergency. Thousands of articles have been published to tackle this... 相似文献
1000.
Khalid Khaizran Usman Muhammad Mehdi Muhammad Abuzar 《Environmental science and pollution research international》2021,28(6):6422-6436
Environmental Science and Pollution Research - In recent years, financial development, trade policies, and energy performance have attracted attention due to their behavior on environmental... 相似文献