scholarly journals Climate change and population dynamics at the tree line: the importance of long-term studies

2007 ◽  
Vol 4 (1) ◽  
pp. 3-5 ◽  
Author(s):  
T Anfodillo
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Tree Line ◽  
Long Term Studies

scholarly journals Climatic Factors, Reproductive Success and Population Dynamics in the Montane Vole Microtus Montanus

2005 ◽  
Vol 29 ◽  
pp. 49-51
Author(s):  
Alita Pinter
Keyword(s):  
Population Dynamics ◽  
Reproductive Success ◽  
Population Density ◽  
Climatic Factors ◽  
Small Rodents ◽  
Microtus Montanus ◽  
Small Measure ◽  
Long Term Studies

A variety of hypotheses has been proposed to explain multiannual fluctuations in population density ("cycles") of small rodents (for reviews see Finerty 1980, Taitt and Krebs 1985). Doubtless, such cycles - known since antiquity (Elton 1942) - result from an interaction of a multitude of factors. However, the inability of extant hypotheses, alone or in combination, to explain the causality of cycles rests in no small measure with the fact that long-term studies of the phenomenon are notoriously uncommon.

The case for long-term studies of greenhouse gas emissions

1999 ◽  
Vol 26 (3) ◽  
pp. 166-168 ◽  
Author(s):  
TIM NEWCOMB
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Greenhouse Gases ◽  
Greenhouse Gas ◽  
Carbon Dioxide Emissions ◽  
Ghg Emissions ◽  
Industrialized Countries ◽  
Intergovernmental Panel ◽  
Long Term Studies

Many nations have recognized the need to reduce the emissions of greenhouse gases (GHGs). The scientific assessments of climate change of the Intergovernmental Panel on Climate Change (IPCC) support the need to reduce GHG emissions. The 1997 Kyoto Protocol to the 1992 Convention on Climate Change (UNTS 30822) has now been signed by more than 65 countries, although that Protocol has not yet entered into force. Some 14 of the industrialized countries listed in the Protocol face reductions in carbon dioxide emissions of more than 10% compared to projected 1997 carbon dioxide emissions (Najam & Page 1998).

scholarly journals Quantifying whether different demographic models produce incongruent results on population dynamics of two long-term studied rodent species

2017 ◽  
Vol 3 (1) ◽  
pp. 18-26
Author(s):  
Giovanni Amori ◽  
Valentina De Silvestro ◽  
Paolo Ciucci ◽  
Luca Luiselli
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
Population Size ◽  
Myodes Glareolus ◽  
Suitable Model ◽  
Demographic Model ◽  
Apodemus Flavicollis ◽  
Demographic Models ◽  
Long Term Studies

Abstract1. Population density (ind/ha) of long-term (>15 years) series of CMR populations, using distinct demographic models designed for both open and closed populations, were analysed for two sympatric species of rodents (Myodes glareolus and Apodemus flavicollis) from a mountain area in central Italy, in order to test the relative performance of various employed demographic models. In particular, the hypothesis that enumeration models systematically underestimate the population size of a given population was tested.2. Overall, we compared the performance of 7 distinct demographic models, including both closed and open models, for each study species. Although the two species revealed remarkable intrinsic differences in demography traits (for instance, a lower propensity for being recaptured in Apodemus flavicollis), the Robust Design appeared to be the best fitting model, showing that it is the most suitable model for long-term studies.3. Among the various analysed demographic models, Jolly-Seber returned the lower estimates of population density for both species. Thus, this demographic model could not be suggested for being applied for long-term studies of small mammal populations because it tends to remarkably underestimate the effective population size. Nonetheless, yearly estimates of population density by Jolly-Seber correlated positively with yearly estimates of population density by closed population models, thus showing that interannual trends in population dynamics were uncovered by both types of demographic models, although with different values in terms of true population size.

scholarly journals Dampening prey cycle overrides the impact of climate change on predator population dynamics: a long‐term demographic study on tawny owls

2014 ◽  
Vol 20 (6) ◽  
pp. 1770-1781 ◽  
Author(s):  
Alexandre Millon ◽  
Steve J. Petty ◽  
Brian Little ◽  
Olivier Gimenez ◽  
Thomas Cornulier ◽  
...  
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Predator Population ◽  
Impact Of Climate Change ◽  
Demographic Study ◽  
The Impact

How to analyze long-term insect population dynamics under climate change: 50-year data of three insect pests in paddy fields

2005 ◽  
Vol 48 (1) ◽  
pp. 31-48 ◽  
Author(s):  
Kohji Yamamura ◽  
Masayuki Yokozawa ◽  
Motoki Nishimori ◽  
Yasuo Ueda ◽  
Tomoyuki Yokosuka
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Insect Pests ◽  
Insect Population ◽  
Paddy Fields ◽  
Insect Population Dynamics

scholarly journals Climatic Factors, Reproductive Success and Population Dynamics in the Montane Vole, Microtus montanus

1997 ◽  
Vol 21 ◽  
pp. 57-59
Author(s):  
Aelita Pinter
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
National Park ◽  
Climatic Factors ◽  
Term Study ◽  
Microtus Montanus ◽  
Long Term Study ◽  
Small Measure ◽  
Long Term Studies

Multiannual fluctuations ("cycles") in population density of small rodents doubtless result from the interaction of a multitude of factors, as evidenced by the variety of hypotheses proposed to explain the phenomenon (for reviews see Finerty 1980, Taitt and Krebs 1985). However, the inability of these hypotheses - alone or in combination - to explain the causality of cycles rests in no small measure with the fact that long-term studies of the phenomenon are notoriously uncommon. The objectives of this project are to continue a long-term study of the population dynamics of the montane vole, Microtus montanus, in Grand Teton National Park. On the basis of earlier observations (Pinter 1986, 1988) particular emphasis will be placed on how environmental variables, possibly acting through reproductive responses, contribute to the population density cycles of these rodents.

scholarly journals Climatic Factors, Reproductive Success and Population Dynamics in the Montane Vole, Microtus montanus.

2003 ◽  
Vol 27 ◽  
pp. 42-44
Author(s):  
Aelita Pinter
Keyword(s):  
Population Dynamics ◽  
Population Density ◽  
National Park ◽  
Climatic Factors ◽  
Term Study ◽  
Microtus Montanus ◽  
Long Term Study ◽  
Small Measure ◽  
Long Term Studies

A variety of hypotheses have been proposed to explain multiannual fluctuations in population density ("cycles") of small rodents (for reviews see Finerty 1980, Taitt and Krebs 1985). Doubtless, such cycles - known since antiquity (Elton 1942) - result from an interaction of a multitude of factors. However, the inability of extant hypotheses, alone or in combination, to explain the causality of cycles rests in no small measure with the fact that long-term studies of the phenomenon are notoriously uncommon. The objectives of this project are to continue the long-term study of population dynamics of the montane vole, Microtus montanus, in Grand Teton National Park. Earlier observations (Pinter 1986, 1988) indicate that environmental variables might contribute to the population density cycles of these rodents, possibly by influencing their growth and various aspects of their reproduction.

scholarly journals Diets of Overwintering Caribou, Rangifer tarandus, Track Decadal Changes in Arctic Tundra Vegetation

2007 ◽  
Vol 121 (4) ◽  
pp. 379 ◽  
Author(s):  
Kyle Joly ◽  
M. Jeanie Cole ◽  
Randi R. Jandt
Keyword(s):  
Population Dynamics ◽  
Global Warming ◽  
Rangifer Tarandus ◽  
Arctic Ecosystems ◽  
Fecal Analysis ◽  
Tundra Vegetation ◽  
Western Arctic ◽  
Winter Diets ◽  
Long Term Studies

We compared winter diets of Western Arctic Herd Caribou (Rangifer tarandus) from 1995/1996 and 2005 using microhistological fecal analysis on samples collected at paired permanent vegetation transects. Changes in the diets of Caribou followed the same trends as vegetative changes documented in long-term studies in northwestern Alaska. Lichens were significantly less prevalent on the landscape and in the winter diets of Caribou between 1995/1996 and 2005, while graminoids (grasses and sedges) were significantly more prevalent. Dramatic changes are forecasted for Arctic ecosystems under global warming scenarios which may continue the trend of declining lichens in northwestern Alaska and in the diet of Western Arctic Herd Caribou. The question of whether or not the altered diet will affect the population dynamics of this herd remains unresolved.

scholarly journals FACTORS DETERMINING THE PHENOMENA IN THE UPER TREE LINE ECOTONE IN THE POLAR URALS MOUNTAINS

2021 ◽  
pp. 42-51
Author(s):  
В.В. Фомин ◽  
С.Г. Шиятов
Keyword(s):  
Morphological Structure ◽  
Woody Vegetation ◽  
Tree Line ◽  
Polar Urals ◽  
Extreme Factors ◽  
Data Source ◽  
The 1960S ◽  
Long Term Studies ◽  
The Polar Urals

The article presents the results of the analysis of long-term studies dedicated to the reaction of woody plants to various extreme factors in the Rai-Iz mountain massif and Chernaya mountain, which are located on the southeastern slope of the Polar Urals in the Sob River basin (Russia). The analysis was performed using a unique archive of landscape photos, which were made by the authors from the beginning of the 1960s until the present. The classifi cation and description of the phenomena that are caused by the infl uence of environmental factors on woody vegetation, as well as their presentation using landscape photos, allow us to expand the possibilities of using ground-based images for the purposes of environmental photo monitoring of woody vegetation at the tree line. They can be used as an independent data source to identify factors that determine a morphological structure and spatial altitude of woody vegetation.

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