scholarly journals Carcass records of autumn-slaughtered reindeer as indicator of long-term changes in animal condition

Rangifer ◽  
2011 ◽  
Vol 31 (1) ◽  
pp. 7-20 ◽  
Author(s):  
Anna Olofsson ◽  
Öje Danell ◽  
Birgitta Åhman ◽  
Pär Forslund
Keyword(s):  
Population Density ◽  
Body Condition ◽  
Skeletal Development ◽  
Strongly Correlated ◽  
Range Use ◽  
Long Term Changes ◽  
Long Term Trends ◽  
Reindeer Population

This study investigates the possibility of using carcass records from the commercial slaughter of reindeer as indicator of long-term changes in animal condition and, thus, the condition and use of their snow-free pasture. The aim was to assess the suitability of this indicator for use within adaptive management programmes for reindeer husbandry grazing resources. Data comprising measurements of carcass weight, conformation and fatness taken from commercial reindeer slaughter between 1994 and 2007, were analysed in relation to year, slaughter date, herding district, population density, and three categories of animals selected for slaughter. The carcass measures were significantly affected by year, and the effects were strongly correlated among the three animal categories. There were generally positive trends over the 14-year period studied. We identified several factors that should be considered when using carcass data to indicate long-term changes in animal body condition: (i) slaughter date had different effects depending on animal category; (ii) reindeer population density negatively affected female and calf carcasses, but not male carcasses. The effects of herding district were similar for carcasses of calves and females, but differed between females and males. Some of the differences between animal categories may be due to differing timing of slaughter (point i above), by different slaughter selection among districts, or have ecological explanations, e.g. sex differences in range use. Uncertainties in the classification of animals when using skeletal development to discriminate between calf and yearling carcasses, may also add to differences among districts. That population density effects on body condition were detectable together with the similarities in the effects of year and general long-term trends between animal categories support the suggestion that carcass measures can be used to indicate general changes in reindeer body condition and range use.

scholarly journals Long-term trends in the relation between daytime and nighttime values of <I>fo</I>F2

2008 ◽  
Vol 26 (5) ◽  
pp. 1199-1206 ◽  
Author(s):  
A. D. Danilov
Keyword(s):  
Solar Activity ◽  
Term Trend ◽  
The World ◽  
Long Term Changes ◽  
Long Term Trends ◽  
Thermospheric Winds ◽  
Long Term Trend ◽  
Ionospheric Sounding ◽  
Limiting Value

Abstract. The data from the vertical ionospheric sounding for 12 stations over the world were analyzed to find the relation between the values of foF2 for 02:00 LT and 14:00 LT of the same day. It is found that, in general, there exists a negative correlation between foF2(02) and foF2(14). The value of the correlation coefficient R(foF2) can be in some cases high enough and reach minus 0.7–0.8. The value of R(foF2) demonstrates a well pronounced seasonal variations, the highest negative values being observed at the equinox periods of the year. It is also found that R(foF2) depends on geomagnetic activity: the magnitude of R(foF2) is the highest for the choice of only magnetically quiet days (Ap<6), decreasing with the increase of the limiting value of Ap. For a fixed limitation on Ap, the value of R(foF2) depends also on solar activity. Apparently, the effects found are related to thermospheric winds. Analysis of long series of the vertical sounding data shows that there is a long-term trend in R(foF2) with a statistically significant increase in the R(foF2) magnitude after about 1980. Similar analysis is performed for the foF2(02)/foF2(14) ratio itself. The ratio also demonstrates a systematic trend after 1980. Both trends are interpreted in terms of long-term changes in thermospheric circulation.

scholarly journals Watervogels – Wintering waterbirds in Flanders, Belgium

ZooKeys ◽  
2020 ◽  
Vol 915 ◽  
pp. 127-135
Author(s):  
Koen Devos ◽  
Filiep T’jollyn ◽  
Peter Desmet ◽  
Frederic Piesschaert ◽  
Dimitri Brosens
Keyword(s):  
Data Use ◽  
Public Domain ◽  
Specific Information ◽  
Ramsar Convention ◽  
The Public ◽  
Darwin Core ◽  
Long Term Trends ◽  
Scientific Name

"Watervogels – Wintering waterbirds in Flanders, Belgium" is a sampling event dataset published by the Research Institute for Nature and Forest (INBO). It contains more than 94,000 sampling events (site counts), covering over 710,000 species observations (and zero counts when there is no associated occurrence) and 36 million individual birds for the period 1991–2016. The dataset includes information on 167 different species in nearly 1,100 wetland sites. The aim of these bird counts is to gather information on the size, distribution, and long-term trends of wintering waterbird populations in Flanders. These data are also used to assess the importance of individual sites for waterbirds, using quantitative criteria. Furthermore, the waterbird counts contribute to international monitoring programs, such as the International Waterbird Census (coordinated by Wetlands International) and fulfil some of the objectives of the European Bird Directive, the Ramsar Convention, and the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA). Here the dataset is published as a standardized Darwin Core Archive and includes for each event: a stable event ID, date and location of observation and a short description of the sampling protocol, effort and conditions (in the event core), supplemented with specific information for each occurrence: a stable occurrence ID, the scientific name and higher classification of the observed species, the number of recorded individuals, and a reference to the observer of the record (in the occurrence extension). Issues with the dataset can be reported at https://github.com/inbo/data-publication/issues. The following information is not included in this dataset and available upon request: roost site counts, counts from historical (inactive) locations and counts from before 1991. We have released this dataset to the public domain under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/). We would appreciate it if you follow the INBO norms for data use (https://www.inbo.be/en/norms-data-use) when using the data. If you have any questions regarding this dataset, do not hesitate to contact us via the contact information provided in the metadata or via [email protected].

scholarly journals Criteria of Classification of Long Period Variables Based on their Light Curve Changes

2002 ◽  
Vol 185 ◽  
pp. 570-571
Author(s):  
V.I. Marsakova
Keyword(s):  
Light Curve ◽  
Light Curves ◽  
Long Period ◽  
Long Period Variables ◽  
Long Term Changes

AbstractSome numerical parameters of long-term changes of light curves in Long Period Variables (LPVs) are obtained. Results of analysis of the sample of 53 LPVs and classification of these stars are discussed.

Long-Term Changes in Population Density of Nest-Box Breeding Great Tits and Blue Tits in Two Contrasting Habitats in Central Poland

2016 ◽  
Vol 64 (3) ◽  
pp. 399-408 ◽  
Author(s):  
Michał Glądalski ◽  
Jarosław Wawrzyniak ◽  
Mirosława Bańbura ◽  
Adam Kaliński ◽  
Marcin Markowski ◽  
...  
Keyword(s):  
Population Density ◽  
Nest Box ◽  
Central Poland ◽  
Long Term Changes ◽  
Contrasting Habitats ◽  
Blue Tits

scholarly journals Infrared Light Curves of Carbon-Rich Variables

2000 ◽  
Vol 177 ◽  
pp. 179-190 ◽  
Author(s):  
Patricia Whitelock
Keyword(s):  
Large Amplitude ◽  
Light Curves ◽  
Infrared Light ◽  
Dust Shells ◽  
Long Term Changes ◽  
Long Term Trends

Long-term trends in the infrared (JHKL) light curves of various carbon variables are described. Some stars, e.g. the semi-regular variables R Scl and GM CMa, show multiple periodicities; others, particularly the Miras with moderately thick dust-shells, show more erratic long-term changes. The light curves for R For, which have been intensively monitored over 20 years, show a pattern which is reminiscent of that seen for R CrB stars. This pattern is superimposed on regular large-amplitude Mira pulsations. The multi-periodic and erratic behaviour of these stars is compared with the predictions from various models.

scholarly journals The method of determination of the long-term trends in the F2 region independent of geomagnetic activity

2002 ◽  
Vol 20 (4) ◽  
pp. 511-521 ◽  
Author(s):  
A. D. Danilov
Keyword(s):  
Geomagnetic Activity ◽  
Regression Line ◽  
Close Relation ◽  
Layer Parameter ◽  
Modeling And Forecasting ◽  
Long Term Changes ◽  
Long Term Trends ◽  
Ap Index

Abstract. A detailed analysis of the f oF2 data at the Sverdlovsk station is performed to answer the question: whether the long-term trends of the F2-layer parameter detected recently are mainly due to the long-term changes in geomagnetic activity during the recent decades. Two methods to derive trends independent of geomagnetic activity are developed. It is found that both methods agree well and give a relative nongeomagnetic trend of about - 0.0015 per year (or an absolute nongeomagnetic trend of about - 0.015 MHz per year). The close relation of foF2 to Ap found by several authors is mainly due to a high correlation between the foF2 deviations from the regression line and year-to-year changes in the Ap index rather than to systematic long-term changes of Ap as has been suggested earlier.Key words. Ionosphere (ionospheric distances; modeling and forecasting)

A RESEARCH OF THE TRANSFORMATION OF THE CHEMICAL COMPOSITION OF SURFACE WATERS USING THE MODERNIZED CLASSIFICATION OF ALEKIN

2020 ◽  
pp. 6-14
Author(s):  
V.K. Khilchevskyi ◽  
S.M. Kurylo
Keyword(s):  
Chemical Composition ◽  
Natural Waters ◽  
Relative Content ◽  
Group Level ◽  
Hydrochemical Regime ◽  
River Waters ◽  
Long Term Changes ◽  
Quantitative Changes

Climatic changes and value of anthropogenic load of watershed of the rivers can be main reasons. The article researched long-term changes in the chemical composition of rivers in Ukraine. Long-term changes in the chemical composition of the river waters of Ukraine were analyzed using the modernized Alekin classification (modernization was proposed by V.K. Khilchevskyi and S.M. Kurylo). The additions introduced by the authors to the basic classification of O.A.Alekin allow fixing the dynamics of changes in the chemical composition of natural waters by cations at the group level, as well as at a more detailed level, revealing quantitative changes in the relative content of class-forming anions (at the level of subtypes). Taking it into account for the most relevant tasks which arise for hydrologists and hydrochemicals are considered to be determination of modern regularities of streamflow and hydrochemical regime in conditions of warming which happens and assessments of such changes for the perspective. The mineralization of water and concentration of the main ions in river waters change for many reasons. Studying has been executed on the Udaj river, Tur`ya river, Sula river. The trend of increasing salinity of river water is detection. Main changes are taking place in the spring. During period of supervisions there was growth of mineralization of water: Sula – from 440 to 1125 mg/dm3.The main factor there is an increased part of groundwater flow. In favor of this conclusion the following results of researches serve. The special executed calculations showed dependence between part of ground flow and chemical composition of water of the rivers. Different classifications are used to systematize natural waters by chemical composition. Attempts to classify water in accordance with the general conditions by which their chemical composition is formed are known. For analysis of long-term changes of the hydrochemical regime in different phases of the water was found and application of the classification of Alekin (modernizated). Modernization does not touch the highest trait – class, but concerns groups and types, with the introduction of a new taxon – subtype. Modernization to the basic classification of Alekhin allow to fixed in detail the dynamics of changes in the chemical composition of natural waters by cations at the group level. At a detailed level, quantitative changes in the relative content of anions (at the level of proposed subtypes) can be fixed. Verification of the modernized classification of O.A. Alekhin, made on 25 rivers of the Dnipro river basin. Rivers are located in different environmental zones, have different anthropogenic pressure and term of observations (40 – 60 years). An attempt was made to apply the modernized classification to other types of natural waters – groundwater and atmospheric.

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