scholarly journals Linking warming effects on phenology, demography, and range expansion in a migratory bird population

2019 ◽  
Vol 9 (5) ◽  
pp. 2365-2375 ◽  
Author(s):  
José A. Alves ◽  
Tómas G. Gunnarsson ◽  
William J. Sutherland ◽  
Peter M. Potts ◽  
Jennifer A. Gill
Keyword(s):  
Range Expansion ◽  
Migratory Bird ◽  
Bird Population

scholarly journals Rapid changes in phenotype distribution during range expansion in a migratory bird

2011 ◽  
Vol 279 (1727) ◽  
pp. 411-416 ◽  
Author(s):  
Tómas Grétar Gunnarsson ◽  
William J. Sutherland ◽  
José A. Alves ◽  
Peter M. Potts ◽  
Jennifer A. Gill
Keyword(s):  
Population Growth ◽  
Range Expansion ◽  
Migratory Bird ◽  
Relative Fitness ◽  
Conservation Strategies ◽  
Small Male ◽  
New Locations ◽  
Phenotype Distribution ◽  
Dispersal Probability ◽  
Male Morphology

The capacity of species to track changing environmental conditions is a key component of population and range changes in response to environmental change. High levels of local adaptation may constrain expansion into new locations, while the relative fitness of dispersing individuals will influence subsequent population growth. However, opportunities to explore such processes are rare, particularly at scales relevant to species-based conservation strategies. Icelandic black-tailed godwits, Limosa limosa islandica , have expanded their range throughout Iceland over the last century. We show that current male morphology varies strongly in relation to the timing of colonization across Iceland, with small males being absent from recently occupied areas. Smaller males are also proportionately more abundant on habitats and sites with higher breeding success and relative abundance of females. This population-wide spatial structuring of male morphology is most likely to result from female preferences for small males and better-quality habitats increasing both small-male fitness and the dispersal probability of larger males into poorer-quality habitats. Such eco-evolutionary feedbacks may be a key driver of rates of population growth and range expansion and contraction.

scholarly journals Multiple density–dependence mechanisms regulate a migratory bird population during the breeding season

2003 ◽  
Vol 270 (1529) ◽  
pp. 2105-2110 ◽  
Author(s):  
Nicholas L. Rodenhouse ◽  
T. Scott Sillett ◽  
Patrick J. Doran ◽  
Richard T. Holmes
Keyword(s):  
Density Dependence ◽  
Breeding Season ◽  
Migratory Bird ◽  
Bird Population

Seasonal Variations of Avifauna of Shallabug Wetland, Kashmir

1970 ◽  
pp. 20-34 ◽  
Author(s):  
Imran A Dar ◽  
Mithas A Dar
Keyword(s):  
Research Work ◽  
Bird Species ◽  
Migratory Bird ◽  
Current Status ◽  
High Power Field ◽  
Long Distance ◽  
Monthly Basis ◽  
Bird Population ◽  
Different Seasons ◽  
Vantage Points

The main thrust in this research work has been given on the evaluation of current status of Avifauna associated with Shallabug wetland. The main objectives were to evaluate the bird population fluctuation, to determine various threats to waterbirds and their habitats, and to present the remedial measures based on the key issues identified. For the purpose of present investigation, the study area was divided systematically into three study units of 700 m² each. Visual census method was used for the estimation of bird population. Visual counting was made with the help of high power field binocular (SG- 9.2) from respective vantage points. The birds were observed on the monthly basis in 2008 and the fluctuation in bird population was determined in different seasons: summer, autumn and winter.  The observations were made from 5:00 am to 7:00 am (when they come out from their resting place) and 6:00 pm to 7:00 pm (when they approach towards their resting place). The analysis of the results showed that the Shallabug Wetland is particularly important for migratory bird species and marsh land breeding species. The wetland was also found important for long distance migrants as a stopper site for feeding and resting. The bird population showed fluctuation with site differences as well as with changing seasons. Key words: Wetland, Shallabug, Avifauna, Fluctuation, Wetland managementDOI: 10.3126/jowe.v2i1.1853 Journal of Wetlands Ecology, (2009) vol. 2, pp 20-34

Decoupling of behavioural and morphological differentiation in a partially migratory bird population

Bird Study ◽  
2014 ◽  
Vol 62 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Michelangelo Morganti ◽  
Susanne Åkesson ◽  
Francisco Pulido
Keyword(s):  
Morphological Differentiation ◽  
Migratory Bird ◽  
Bird Population

Controlling disease in migratory bird population: a probable solution through mathematical study

2006 ◽  
Vol 21 (3) ◽  
pp. 265-288 ◽  
Author(s):  
Samrat Chatterjee ◽  
Asit K. Ghosh ◽  
J. Chattopadhyay
Keyword(s):  
Migratory Bird ◽  
Mathematical Study ◽  
Bird Population

scholarly journals Transfer of heavy metals from lake water to biota: a potential threat to migratory birds of Mathura lake, West Bengal, India

2015 ◽  
Vol 1 ◽  
pp. 1-7
Author(s):  
Piyal Bhattacharya ◽  
Keyword(s):  
Heavy Metals ◽  
Lake Water ◽  
West Bengal ◽  
Migratory Birds ◽  
Migratory Bird ◽  
Oxbow Lake ◽  
Potential Threat ◽  
Bird Population ◽  
Toxicity Threshold ◽  
Fish Samples

The present study was conducted in the Mathura oxbow lake, West Bengal, India to assess the severity in transferring harmful heavy metals from lake water to its biota. Plenty of common and seasonal migratory birds are dependent on this lake for their food and nesting. The results of current investigation right away threaten the living and survival of lake biota including the migratory birds. The lake water was found to be highly polluted with cadmium (0.001–0.003 mg/l) and chromium (0.01–0.05 mg/l), and moderately polluted with zinc (0.06–0.08 mg/l) and coliform load (2×104 cfu/ml). The studied plant and fish samples of the lake were detected to bioaccumulate heavy metals viz. cadmium and zinc far exceeding the recommended toxicity threshold levels. From contaminated fishes these toxic metals may ultimately transmit and be biomagnified in birds, and thus may endanger the entire migratory bird population. Keywords: Heavy metal, lake pollution, Mathura Lake, migratory birds.

Sign in / Sign up

Export Citation Format

Share Document