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Search Results: 1 - 10 of 21 matches for " Dolenec "
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Spring migration characteristics of the House Martin, Delichon urbica (Aves: Hirundinidae) in Croatia: A response to climate change?
Dolenec, Zdravko;Dolenec, Petra;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000100020
Abstract: many authors have discussed use of birds (and other organisms) as sensitive biomonitors for climate change. in this paper we investigate the long-term trends in first arrival dates of the long-distance migratory house martin, delichon urbica (linneus, 1758), in north-western croatia during the 28-year period. the aim of this paper is to identify possible relationship between arrival times and local spring air temperatures. between 1981 and 2008 the house martin arrived progressively earlier (5.9 days), probably in response to climate change. first arrival dates correlated significantly with increasing march-april mean temperatures. correlation between mean spring air temperature and yearly temperatures were also statistically significant. our results suggest that the arrival timing of the house martin is influenced by spring air temperatures
The Permian-Triassic boundary in the Idrijca Valley (Western Slovenia): isotopic fraction between carbonate and organic carbon at P/Tr transition
Tadej Dolenec,Sonja Lojen,Matej Dolenec
Geologija , 1999,
Abstract:
The Permian-Triassic boundary in the Karavanke Mountains (Slovenia): Stable isotope variations in the boundary carbonate rocks of the Ko utnik Creek and Brsnina section
Tadej Dolenec,Stanko Buser,Matej Dolenec
Geologija , 1998,
Abstract:
Ce anomaly at the Permian-Triassic boundary in the Idrijca Valley as evidence of changing redox conditions at the P/Tr transition in the western Tethys (Slovenia)
Tadej Dolenec,Sonja Lojen
Geologija , 2000,
Abstract:
Organic carbon isotope variability across the P/Tr boundary in the Idrijca Valley section (Slovenia): A high resolution study
Matej Dolenec,Bojan Ogorelec
Geologija , 2001,
Abstract:
Potentially toxic elements content in the surficial marine sediment (peloid) from Makirina bay (central Adriatic)
Komar D.,Lamba?a Belak ?.,Dolenec T.,Dolenec M.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130116006
Abstract: The aim of the present study was to determine the concentrations of several potentially toxic elements (PTE) in the recent marine sediment of Makirina bay (central Adriatic), which could according to its organoleptic properties be used as a virgin material for medical treatment, wellness and relax purposes. Sediment samples were collected in June and July 2010 from six different sites in the central part of the bay. The range of measured elemental concentrations in analysed surficial sediment were: As (11-15,8 ppm), Cr (61,6 -109,5 ppm), Cu (19,4-54,2 ppm), Pb (16,8-29,6 ppm) and Zn (37-52 ppm). Sediment PTE pollution assessment was performed using contamination factor (CF), contamination degree (Cdeg) and pollution load index (PLI). The calculated environmental index values show a low to moderate contamination status of sediment. Future geochemical investigation on these sediments are necessary prior actual use in various therapeutic treatment.
Warmer springs, laying date and clutch size of tree sparrows Passer montanus in Croatia
Z. DOLENEC, P. DOLENEC, A.P. M?LLER
Current Zoology , 2011,
Abstract: Global surface air temperatures increased during the past 100 years. Many long-term studies of birds have reported a climatic influence on breeding performance. We analysed long-term changes in first laying date and clutch size for first clutches of sedentary, hole-nesting and socially monogamous tree sparrows Passer montanus during 1980–2009 in northwestern Croatia. Laying date advanced and spring temperature increased significantly during the study. Date of laying was significantly correlated with mean air spring temperature and advanced by 8.6 days during the 30 years period. Laying date was delayed in extremely cold, but not in extremely warm springs compared to years with normal temperatures. These results suggest that current climate change including extreme change does not have negative effects on timing of laying or clutch size. In contrast to laying date, clutch size did not vary systematically during the study period or with mean spring air temperature changes [Current Zoology 57 (3): 414–418, 2011].
Impacts of Pb-Zn mining on Lake Kalimanci and Human Health in Eastern Macedonia
Vrhovnik P.,Dolenec M.,Dolenec T.,Serafimovski T.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130140006
Abstract: Mining is very important economic activity. However, mining and related industries presents the main threat for environment. Pollution with heavy metals is a significant problem in Eastern Republic of Macedonia. In year 2003 great environmental disaster happened near small town Makedonska Kamenica, when the Sasa tailings dam collapsed and caused an intensive flow of mining waste material through Kamenica River valley and was discharged into Lake Klaimanci. Water from lake is used for irrigation, thus, the pollution assessment of the Lake Kalimanci sediments was made. The major, trace and rare earth element contamination in surficial lake sediments was studied to assess the effects of metalliferous mining activities. The mean concentrations of major elements [wt %] Si 23.5, Al 7.9, Fe 6.6, Mg 1.3, Ca 3.8, Na 1.1, K 2.3, Ti 0.4, P 0.2, Mn 0.6 and trace elements ranged within: Mo 1.0-4.6 mg kg-1, Cu 144.4-1162 mg kg-1, Pb 1874-16300 mg kg-1, Zn 2944-20900 mg kg-1, Ni 21.7-79.3 mg kg-1, Cd 16.5-136 mg kg-1, Sb 0.6-3.6 mg kg-1, Bi 3.0-24,3 mg kg-1 and Ag 1.4-17.3 mg kg-1. Results of rare earth elements (REE) in surficial lake sediments indicated that are tightly related to the catchment geology. The results of the sequential extraction procedure revealed the majority (Cd, Zn, Pb, Ni, Cu and Cd) of investigated toxic metals and all REEs to be strongly bonded to the exchangeable fraction and the rest (As and Mo) to the oxidizable fraction. Regarding to results is evident that heavy metals and REEs are highly bioavailable for living organisms and can seriously affect human health.
The Paleocene-Eocene boundary in a flysch sequence from Gori ka Brda (Western Slovenia): Oxygen and carbon stable isotope variations
Tadej Dolenec,Jernej Pav?i?,Sonja Lojen
Geologija , 2000,
Abstract:
Isotope composition of O and C in Mesozoic carbonate rocks of Slovenia - effect of facies and diagenesis
Bojan Ogorelec,Tadej Dolenec,Jo?e Pezdi?
Geologija , 1999,
Abstract:
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