Time of emergence of novel climates for North American migratory bird populations

Ecography ◽  
2019 ◽  
Vol 42 (6) ◽  
pp. 1079-1091 ◽  
Author(s):  
Frank A. La Sorte ◽  
Daniel Fink ◽  
Alison Johnston
Keyword(s):  
North American ◽  
Migratory Bird ◽  
Bird Populations

scholarly journals The implications of mid‐latitude climate extremes for North American migratory bird populations

Ecosphere ◽  
2016 ◽  
Vol 7 (3) ◽  
Author(s):  
Frank A. La Sorte ◽  
Wesley M. Hochachka ◽  
Andrew Farnsworth ◽  
André A. Dhondt ◽  
Daniel Sheldon
Keyword(s):  
North American ◽  
Climate Extremes ◽  
Migratory Bird ◽  
Bird Populations

Seasonal associations with novel climates for North American migratory bird populations

2018 ◽  
Vol 21 (6) ◽  
pp. 845-856 ◽  
Author(s):  
Frank A. La Sorte ◽  
Daniel Fink ◽  
Alison Johnston
Keyword(s):  
North American ◽  
Migratory Bird ◽  
Bird Populations

scholarly journals Long-term trends and drought: spatiotemporal variation in juvenile sex ratios of North American ducks

2021 ◽  
Author(s):  
Sage Ellis ◽  
Madeleine Lohman ◽  
James Sedinger ◽  
Perry Williams ◽  
Thomas Riecke
Keyword(s):  
United States ◽  
North American ◽  
Sex Ratios ◽  
Survival Rates ◽  
The United States ◽  
Avian Communities ◽  
Eastern United States ◽  
Bird Populations ◽  
Long Term Trends

Sex ratios affect population dynamics and individual fitness, and changing sex ratios can be indicative of shifts in sex-specific survival at different life stages. While climate- and landscape-change alter sex ratios of wild bird populations, long-term, landscape scale assessments of sex ratios are rare. Further, little work has been done to understand changes in sex ratios in avian communities. In this manuscript, we analyse long-term (1961-2015) data on five species of ducks across five broad climatic regions of the United States to estimate the effects of drought and long-term trends on the proportion of juvenile females captured at banding. As waterfowl have a 1:1 sex ratio at hatch, we interpret changes in sex ratios of captured juveniles as changes in sex-specific survival rates during early life. Seven of twelve species-region pairs exhibited evidence for long-term trends in the proportion of juvenile females at banding. The proportion of juvenile females at banding increased for duck populations in the western United States and typically declined for duck populations in the eastern United States. We only observed evidence for an effect of drought in two of the twelve species-region pairs, where the proportion of females declined during drought. As changes to North American landscapes and climate continue and intensify, we expect continued changes in sex-specific juvenile survival rates. More broadly, we encourage further research examining the mechanisms underlying long-term trends in juvenile sex ratios in avian communities.

Impact of hydro-thermal conditions on the spatio-temporal patterns of migratory bird populations

2017 ◽  
Vol 37 (8) ◽  
Author(s):  
赵红梅 ZHAO Hongmei ◽  
陈晓玲 CHEN Xiaoling ◽  
徐冰 XU Bing ◽  
冯炼 FENG Lian
Keyword(s):  
Thermal Conditions ◽  
Temporal Patterns ◽  
Migratory Bird ◽  
Bird Populations ◽  
Spatio Temporal

scholarly journals Seasonal changes in the altitudinal distribution of nocturnally migrating birds during autumn migration

2015 ◽  
Vol 2 (12) ◽  
pp. 150347 ◽  
Author(s):  
Frank A. La Sorte ◽  
Wesley M. Hochachka ◽  
Andrew Farnsworth ◽  
Daniel Sheldon ◽  
Benjamin M. Van Doren ◽  
...  
Keyword(s):  
Migratory Birds ◽  
Global Climate ◽  
Polar Front ◽  
Migratory Bird ◽  
Atmospheric Conditions ◽  
Altitudinal Distribution ◽  
Long Distance ◽  
Bird Populations ◽  
Intermediate Distance ◽  
Migrating Birds

Wind plays a significant role in the flight altitudes selected by nocturnally migrating birds. At mid-latitudes in the Northern Hemisphere, atmospheric conditions are dictated by the polar-front jet stream, whose amplitude increases in the autumn. One consequence for migratory birds is that the region’s prevailing westerly winds become progressively stronger at higher migration altitudes. We expect this seasonality in wind speed to result in migrants occupying progressively lower flight altitudes, which we test using density estimates of nocturnal migrants at 100 m altitudinal intervals from 12 weather surveillance radar stations located in the northeastern USA. Contrary to our expectations, median migration altitudes deviated little across the season, and the variance was lower during the middle of the season and higher during the beginning and especially the end of the season. Early-season migrants included small- to intermediate-sized long-distance migrants in the orders Charadriiformes and Passeriformes, and late-season migrants included large-bodied and intermediate-distance migrants in the order Anseriformes. Therefore, seasonality in the composition of migratory species, and related variation in migration strategies and behaviours, resulted in a convex–concave bounded distribution of migration altitudes. Our results provide a basis for assessing the implications for migratory bird populations of changes in mid-latitude atmospheric conditions probably occurring under global climate change.

scholarly journals Aplikasi Penderiaan Jauh atau Remote Sensing dalam Pemodelan Pengaruh Iklim terhadap Taburan Burung Hijrah Di Hutan Paya Laut Matang, Perak

2016 ◽  
Vol 8 (3) ◽  
Author(s):  
Azimah Abd Rahman
Keyword(s):  
Remote Sensing ◽  
Habitat Selection ◽  
Mangrove Forest ◽  
Migratory Birds ◽  
Climate Modeling ◽  
Migratory Bird ◽  
Bird Populations ◽  
Alternative Habitat ◽  
The Future ◽  
Selection Of

Climate changes especially temperature and rainfall effect the habitat selection of bird migration in mangrove area to get some food and temporary stopover. The increase and decrease of temperature and rainfall is varies between upstream to downstream. This research was done to prove that temperature and rainfall are uneven in some area even in same boundary that can give impact in habitat selection of migratory birds. This research was concern around Matang Mangrove Forest, Perak that already familiar as focal area for migratory birds. Remote Sensing application was used in this research through use of ERDAS Imagine 8.5 which is based on pixels. This application helps to model the relationship between climate, namely temperature and rainfall with distribution density of migratory birds around the study area. Climate modeling was conducted to predict the distribution of migratory bird populations in the future due to changes in temperature and rainfall over a period of 5 years and 20 years. The results of this study showed a decrease in the population of migratory birds by 6.4% for a period of 5 years and a decrease to 7.5% for the last 20 years.  Sungai Sepetang and Sungai Selinsing shown that migratory bird populations decreased continuously after 20 years. However the Sangga Besar, Teluk Kertang, Temerlok, Pulau Pasir Hitam dan Sungai Tinggi area showed an increase in the arrival of migratory birds after 20 years.  This information analysis help the related agencies in manage and maintain the area around the Matang Mangrove Forest identified potential habitat for migratory birds in the future. In addition, through this study migratory bird monitoring can be carried out systematically on a wider scope without ignoring areas that strives to be the alternative habitat for migratory birds in the future.

scholarly journals Monitoring Migratory Bird Populations in Grand Teton National Park, Northern Rocky Mountains

1993 ◽  
Vol 17 ◽  
pp. 55-67
Author(s):  
Martin Cody ◽  
Steven Cain
Keyword(s):  
National Park ◽  
Migratory Bird ◽  
Routine Activity ◽  
Breeding Bird ◽  
Grand Teton National Park ◽  
Monitoring Scheme ◽  
Bird Populations ◽  
Jackson Hole ◽  
Study Sites ◽  
Land Bird

A scheme for long-term monitoring of breeding land bird populations in a wide variety of habitats representative of the northern Rockies and the Greater Yellowstone Ecosystem (GYE) was initiated in summer 1993. It is projected that the monitoring scheme, when fully established and formalized, will become a routine activity in Grand Teton National Park, where a broad range of representative vegetation types is accessible within close geographic proximity. Sixteen study sites were established within the park in pristine habitat, from the Jackson Hole lowlands to subalpine and alpine sites, from meadow, sagebrush and marshland, through willow scrub, cottonwood and aspen woodlands, to lodgepole pine and spruce-fir forests. Some of the study sites have a long history of research on the breeding birds (see below). Census sites are standardized at 5 ha in size, and mapped in detail (topography, vegetation). The locations and accessibility of the study sites permit all to be regularly and repeatedly censused during the short (6-week) breeding season. Census schedules, timing, and methodological protocols are being established and refined, to provide for strictly controlled inter-site and inter-year comparisons in breeding bird populations, species composition, and densities. In view of the projected benefits to science and resource management of this monitoring scheme, the project hopefully will be continued and the data base further expanded in future years, with a larger range of study sites (24-36).

scholarly journals Global change and the distributional dynamics of migratory bird populations wintering in Central America

2017 ◽  
Vol 23 (12) ◽  
pp. 5284-5296 ◽  
Author(s):  
Frank A. La Sorte ◽  
Daniel Fink ◽  
Peter J. Blancher ◽  
Amanda D. Rodewald ◽  
Viviana Ruiz-Gutierrez ◽  
...  
Keyword(s):  
Global Change ◽  
Central America ◽  
Migratory Bird ◽  
Bird Populations ◽  
Distributional Dynamics
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