scholarly journals Population size dynamics and spatial distribution of Tundra Swan Cygnus columbianus wintering in Poyang Lake

2018 ◽  
Vol 30 (6) ◽  
pp. 1646-1654
Author(s):  
WEI Zhenhua ◽  
◽  
LI Yankuo ◽  
SHAN Jihong ◽  
WANG Lingfeng ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Population Size ◽  
Poyang Lake ◽  
Cygnus Columbianus ◽  
Tundra Swan

scholarly journals Changes in Tundra Swan Cygnus columbianus bewickii distribution and abundance in the Yangtze River floodplain

2011 ◽  
Vol 21 (3) ◽  
pp. 260-265 ◽  
Author(s):  
PEIHAO CONG ◽  
LEI CAO ◽  
ANTHONY D. FOX ◽  
MARK BARTER ◽  
EILEEN C. REES ◽  
...  
Keyword(s):  
Water Quality ◽  
Yangtze River ◽  
Poyang Lake ◽  
Submerged Vegetation ◽  
Three Gorges ◽  
The Yangtze River ◽  
Vegetation Productivity ◽  
River Floodplain ◽  
Cygnus Columbianus ◽  
Tundra Swan

Approximately 75% of the East Asian Flyway Tundra Swan Cygnus columbianus bewickii population winters in the Yangtze River floodplain, China. Historically the species was more widely distributed throughout the floodplain but now most of the population is confined to five wetlands in Anhui Province and to Poyang Lake in Jiangxi Province, where the majority (up to 113,000 birds) occur. Within-winter counts suggest that swans congregate at Poyang Lake before dispersing to other sites later in the winter. Counts show large between-year fluctuations, but suggest declines at Shengjin and Fengsha Lakes (both in Anhui) during the last five years. Declines at Shengjin Lake are likely due to decreases in submerged vegetation (particularly tuber-producing Vallisneria, a major food item) perhaps linked to eutrophication. Range contractions throughout the floodplain may also be linked to reductions in submerged vegetation coverage elsewhere. Changes in water quality and lake hydrology post-Three Gorges Dam may have adversely affected submerged vegetation productivity. Key information needs for the effective implementation of conservation measures for Tundra Swans include: (1) annual surveys of all major wintering sites throughout each winter to establish the importance of different sites during the non-breeding period; (2) more information on swan diets at important sites; and (3) an assessment of adverse effects of water quality and lake water levels post-Three Gorges Dam on submerged vegetation productivity at Poyang Lake and other important sites.

A preliminary investigation on the population and behavior of the Tundra Swan (Cygnus columbianus) in Poyang Lake

2013 ◽  
Vol 33 (18) ◽  
pp. 5768-5776
Author(s):  
戴年华 DAI Nianhua ◽  
邵明勤 SHAO Mingqin ◽  
蒋丽红 JIANG Lihong ◽  
杜建华 DU Jianhua ◽  
蒋剑虹 JIANG Jianhong ◽  
...  
Keyword(s):  
Poyang Lake ◽  
Preliminary Investigation ◽  
Cygnus Columbianus ◽  
And Behavior ◽  
Tundra Swan

Quantitative Analysis on Spatial Distribution of Land Cover Pattern and Landscape Features in Poyang Lake Region

2012 ◽  
Vol 14 (3) ◽  
pp. 327-337
Author(s):  
Yingying RAN ◽  
Juanle WANG ◽  
Yongjie ZHANG ◽  
Yujie LI ◽  
Yujie ZHOU
Keyword(s):  
Spatial Distribution ◽  
Quantitative Analysis ◽  
Land Cover ◽  
Poyang Lake ◽  
Landscape Features ◽  
Poyang Lake Region ◽  
Lake Region ◽  
Cover Pattern

Spatial distribution, source analysis, and ecological risk assessment of DDTs in typical wetland surface soils of Poyang Lake

2012 ◽  
Vol 68 (4) ◽  
pp. 1135-1141 ◽  
Author(s):  
Chiquan He ◽  
Jiamiao Liu ◽  
Jun Li ◽  
Xia Liang ◽  
Xue-Ping Chen ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Spatial Distribution ◽  
Ecological Risk ◽  
Ecological Risk Assessment ◽  
Poyang Lake ◽  
Source Analysis ◽  
Surface Soils

Has winter body condition varied with population size in a long-distance migrant, the Bewick’s Swan (Cygnus columbianus bewickii)?

2018 ◽  
Vol 64 (4) ◽  
Author(s):  
Kevin A. Wood ◽  
Julia L. Newth ◽  
Geoff M. Hilton ◽  
Eileen C. Rees
Keyword(s):  
Population Size ◽  
Body Condition ◽  
Long Distance ◽  
Cygnus Columbianus ◽  
Bewick’S Swan

Four new species of feather mites (Acari: Analgoidea)

2002 ◽  
Vol 134 (5) ◽  
pp. 605-618 ◽  
Author(s):  
Sergei V. Mironov ◽  
Terry D. Galloway
Keyword(s):  
New Species ◽  
Hysteronotal Shield ◽  
Feather Mites ◽  
Prodorsal Shield ◽  
Cygnus Columbianus ◽  
Pelecanus Erythrorhynchos ◽  
Porzana Carolina ◽  
American White Pelican ◽  
Tundra Swan

AbstractFour new species of feather mites are described from birds in Canada: Megniniella ratcliffisp.nov. (Analgidae) and Metanalges holderisp.nov. (Analgidae) from the Sora, Porzana carolina (Linnaeus) (Gruiformes: Rallidae): Metingrassia pelecanisp.nov. (Xolalgidae) from the American White Pelican, Pelecanus erythrorhynchos Gmelin (Pelecaniformes: Pelecanidae); and Vingrassia cygnisp.nov. (Xolalgidae) from the Tundra Swan, Cygnus columbianus (Ord) (Ànseriformes: Anatidae). The genus Vingrassia is reinstated from its previous synonymy with the genus Ingrassia based on the presence of an enlarged prodorsal shield in both sexes, by the shape of the idiosoma and the interlobar membrane on the lobar apices in the male, and by the shape of the hysteronotal shield and the absence of setae ps2 in the female.

Morphological characteristics and spatial distribution patterns of Vitex trifolia nebkhas in the Poyang Lake sand land

2019 ◽  
Vol 39 (14) ◽  
Author(s):  
张海娜 ZHANG Haina ◽  
鲁向晖 LU Xianghui ◽  
黄国敏 HUANG Guomin ◽  
李阳 LI Yang ◽  
王瑞峰 WANG Ruifeng ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Poyang Lake ◽  
Morphological Characteristics ◽  
Distribution Patterns ◽  
Spatial Distribution Patterns ◽  
Sand Land

The geographical distribution of passenger railway hubs in Russia

2020 ◽  
pp. 121-130
Author(s):  
K. V. Samburov
Keyword(s):  
Spatial Distribution ◽  
Population Size ◽  
Geographical Distribution ◽  
Saint Petersburg ◽  
Economic Regions

The geographical distribution of 550 passenger railway nodes that are serving longer distance trains were studied. It’s containing 622 stations, which encompass more than 97% of passenger departures total number on the railway in 2016 were selected and grouped according to its size and the main nodes’characteristics were analyzed. Studying dependence of node’s rank and size from number of people, which live in its area, revealed that the less population size center is, the more other factors influence. The factual and ideal Zipf’s curve for the hierarchy of railway nodes were analyzed and its discrepancy was identified. An excessive role of Moscow as a main node and of Saint Petersburg as the second center is a feature in the hierarchy of nodes. This research also represents the analysis of nodes’ upper groups (more than 250 000 passenger departures per year). Spatial distribution of passenger railway nodes on the territory of Russia is descripted and the similarity of it with area of main resettlement was found. However, the density of relatively large nodes increases in Central and Central Black Earth economic regions and in Circum-Pontic region

scholarly journals Characteristics and Changes of Extreme Precipitation in the Yellow–Huaihe and Yangtze–Huaihe Rivers Basins, China

2011 ◽  
Vol 24 (14) ◽  
pp. 3781-3795 ◽  
Author(s):  
Quan Dong ◽  
Xing Chen ◽  
Tiexi Chen
Keyword(s):  
Monte Carlo ◽  
Spatial Distribution ◽  
Extreme Precipitation ◽  
Daily Precipitation ◽  
Poyang Lake ◽  
Yellow River ◽  
Statistical Significance ◽  
Monte Carlo Experiment ◽  
Huaihe River ◽  
Daily Precipitation Data

Abstract Many works suggest that the intensity of extreme precipitation might be changing under the background of global warming. Because of the importance of extreme precipitation in the Yellow–Huaihe and Yangtze–Huaihe River basins of China and to compare the spatial difference, the generalized Pareto distribution (GPD) function is used to fit the daily precipitation series in these basins and an estimate of the extreme precipitation spatial distribution is presented. At the same time, its long-term trends are estimated for the period between 1951 and 2004 by using a generalized linear model (GLM), which is based on GPD. High quality daily precipitation data from 215 observation stations over the area are used in this study. The statistical significance of the trend fields is tested with a Monte Carlo experiment based on a two-dimensional Hurst coefficient, H2. The spatial distribution of the shape parameter of GPD indicates that the upper reaches of the Huaihe River (HuR) basin have the largest probability of extreme rainfall events, which is consistent with most historical flood records in this region. Spatial variations in extreme precipitation trends are found and show significant positive trends in the upper reaches of Poyang Lake in the Yangtze River (YaR) basin and a significant negative trend in the mid- to lower reaches of the Yellow River (YeR) and Haihe River (HaR) basins. The trends in the HuR basin and the lower reaches of Poyang Lake in the YaR basin are nearly neutral. All trend fields are significant at the 5% level of significance from the Monte Carlo experiments.

Population size structure, spatial distribution, and life cycle of the hydromedusa Aglantha digitale (O.F. Müller, 1766) in the White Sea

Oceanology ◽  
2006 ◽  
Vol 46 (2) ◽  
pp. 228-237 ◽  
Author(s):  
N. M. Pertsova ◽  
K. N. Kosobokova ◽  
A. A. Prudkovsky
Keyword(s):  
Spatial Distribution ◽  
Life Cycle ◽  
Population Size ◽  
White Sea ◽  
Size Structure ◽  
The White Sea ◽  
Population Size Structure
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