Autumn Migration of Waders (Charadrii) at the Reda Mouth (N Poland)

Ring ◽  
2009 ◽  
Vol 31 (1) ◽  
pp. 23-39 ◽  
Author(s):  
Włodzimierz Meissner ◽  
Anna Włodarczak-Komosińska ◽  
Dariusz Górecki ◽  
Cezary Wójcik ◽  
Mateusz Ściborski ◽  
...  
Keyword(s):  
Migration Pattern ◽  
Egg Laying ◽  
Autumn Migration ◽  
Tundra Zone ◽  
Age Classes ◽  
Calidris Alpina ◽  
Mouth Region ◽  
Baltic Coast ◽  
Northern Latitudes ◽  
Vanellus Vanellus

Autumn Migration of Waders (Charadrii) at the Reda Mouth (N Poland) The migration of waders was investigated at the Reda mouth (Polish Baltic coast) between 1996 and 2001. During the study 496 counts were conducted in the period between 5 July and 5 October. The most numerous species observed were: the Lapwing (Vanellus vanellus) - 39.5% and Dunlin (Calidris alpina) - 29.8% of all waders. Because of a variety of habitats in the Reda mouth region, among the waders staging numerously in the Reda mouth there were species typical both for coastal and inland habitat. It was shown that birds from tundra zone migrated later than those from more southern breeding areas, which was caused by much later beginning of egg laying in northern latitudes. Moreover, in the species from tundra zone, e.g. the Knot (Calidris canutus), Little Stint (C. minuta), Curlew Sandpiper (C. ferruginea), the migration of both age classes were well separated, whereas in those from more southern areas, e.g. the Little Ringed Plover (Charadius dubius), Common Sandpiper (Actitis hypoleucos), such difference was less pronounced and the period of common passage of adults and juveniles was much longer. A comparison of the obtained data on migration pattern with some other sites in Poland where regular counts were conducted showed several similarities and some discrepancies, which are discussed in the paper.

scholarly journals Autumn Passage of Waders (Charadrii) in the Middle Vistula Valley (Kaliszany, Central Poland)

Ring ◽  
2009 ◽  
Vol 31 (1) ◽  
pp. 53-64
Author(s):  
Grzegorz Grzywaczewski ◽  
Jarosław Wiącek ◽  
Marcin Polak
Keyword(s):  
Dominant Species ◽  
Autumn Migration ◽  
Numerous Species ◽  
Calidris Alpina ◽  
Central Poland ◽  
Philomachus Pugnax ◽  
Vanellus Vanellus ◽  
Migration Dynamics ◽  
Common Sandpiper

Autumn Passage of Waders (Charadrii) in the Middle Vistula Valley (Kaliszany, Central Poland) The phenology and dynamics of wader migration were studied at a stopover area in the middle Vistula Valley (Kaliszany ringing station, 51°05'N, 21°48'E, central Poland). The study was conducted during autumn passage seasons of 1993-1996 and 1999-2001. At this time 364 counts were done from mid-July to the end of October. Altogether 23 030 waders of 27 species were recorded within the study period. The most numerous species observed were: the Northern Lapwing (Vanellus vanellus) — 49% of all birds, Common Sandpiper (Actitis hypoleucos) — 16% and Greenshank (Tringa nebularia) — 9%. Species constituting ca 2-4% of all noted waders each were: the Dunlin (Calidris alpina), Spotted Redshank (T. erythropus), Wood Sandpiper (T. glareola), Curlew (Numenius arquata), Ruff (Philomachus pugnax) and Green Sandpiper (T. ochropus). The proportion of the remaining species did not exceed 2%. The pattern of autumn migration dynamics is presented for the dominant species.

scholarly journals Why Did Lapwings Vanellus vanellus in Managed Habitat Advance Egg Laying During a Period without Warming Early Springs?

Ardea ◽  
2017 ◽  
Vol 105 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Obe H. Brandsma ◽  
Rosemarie Kentie ◽  
Theunis Piersma
Keyword(s):  
Egg Laying ◽  
Vanellus Vanellus

scholarly journals Molt Strategies and Age Differences in Migration Timing Among Autumn Landbird Migrants in Southwestern Idaho

The Auk ◽  
2005 ◽  
Vol 122 (4) ◽  
pp. 1070-1085 ◽  
Author(s):  
Jay D. Carlisle ◽  
Gregory S. Kaltenecker ◽  
David L. Swanson
Keyword(s):  
United States ◽  
North America ◽  
Age Differences ◽  
Western United States ◽  
Autumn Migration ◽  
Individual Species ◽  
Age Classes ◽  
Migration Timing ◽  
Breeding Grounds ◽  
Age And Sex

Abstract Intraspecific patterns of autumn migration timing are not well known, particularly in the western United States. Here, we (1) describe autumn migration timing and age ratios of landbird migrants in southwestern Idaho, (2) examine differences in timing among age and sex classes, and (3) demonstrate how prebasic molt strategies affect migration timing differences between age classes. As a group, Neotropical migrants were most common from late July through early September, whereas temperate migrants were most common from mid-September into early October. Proportion of hatch-year birds was 74.5% for all migrants combined and ranged from 33.3% to 100% for individual species. Timing differences between sex classes were detected in only a few species and no general patterns emerged. In 22 of 31 Neotropical and temperate migrants examined, there were significant differences in timing between adults and hatch-year birds. In species in which adults begin fall migration before replacing flight feathers, adults migrated earlier than hatch-year birds. Conversely, in species in which adults molt flight feathers on or near the breeding grounds before departing on fall migration, hatch-year birds migrated earlier than adults in all but one case. Therefore, it appears that molt strategy is a powerful determinant of intraspecific migration timing differences and, to our knowledge, this is the first study to document this pattern among migrant passerines of North America. Estrategias de Muda y Diferencias en el Momento de Migración Otoñal en Migrantes Terrestres en el Suroeste de Idaho

scholarly journals Dynamics of Autumn Migration of the Acrocephalus Warblers Through the Polish Baltic Coast

Ring ◽  
2009 ◽  
Vol 31 (2) ◽  
Author(s):  
Anna Kozłowska ◽  
Katarzyna Stępniewska ◽  
Krzysztof Stępniewski ◽  
Przemysław Busse
Keyword(s):  
Autumn Migration ◽  
Baltic Coast ◽  
Acrocephalus Warblers

scholarly journals Autumn Migration of the Wood Pigeon, Columba palumbus, at Eastern Part of the Polish Baltic Coast

The Ring ◽  
2019 ◽  
Vol 41 (1) ◽  
pp. 27-41
Author(s):  
Justyna M. Machowina ◽  
Izabella Rząd
Keyword(s):  
Wave Structure ◽  
Estimation Procedure ◽  
Autumn Migration ◽  
Baltic Coast ◽  
Step Procedure ◽  
Ranking Scheme ◽  
Diurnal Migrant ◽  
Further Development ◽  
Wood Pigeon

Abstract The Wood Pigeon, Columba palumbus, is a common diurnal migrant across most of the Europe. The visual observations were carried out during autumn work of the Operation Baltic ringing stations, mainly at Mierzeja Wiślana (54°21’N, 19°19’E) parallely to the ringing of birds. Observations of passing birds were performed 15 minutes per every hour from sunrise to sunset. The autumn observation period was long enough to cover whole pigeons migration at the southern coast of Baltic (14 Aug. – 11 Nov.). Altogether 119,019 Wood Pigeons were observed within 20 seasons of observations. The goals of this work is (1) to describe the course of the Wood Pigeon autumn migration at the Polish Baltic coast as to numbers in long-term aspect and the seasonality of migration, (2) to propose further development in the study on wave structure of the bird passage. The main analysis of this work-description of the seasonal dynamics of migration - was carried out with modified and widened method used for that kind of analysis in earlier publications. In the present paper the wave structure is described by the estimated border days between supposed waves taking under consideration different properties of the passage dynamics. Here are used three groups of parameters: (1) total numbers of birds observed daily during several years, inter-year variability (as SD between year number values), and the coefficient of variation (V), (2) number of migration peaks that occurred in that date within years of the study (there were used two classes of peaks – High Peaks and Peaks), (3) numbers of birds passing during recognized peak days. All estimations were done independently of others and only finally summarized using common ranking scheme. Such step by step procedure make estimation more and more reliable. Very high agreement between estimations based on three groups of parameters suggests strongly that the proposed estimation procedure is effective enough.

scholarly journals Age-Specific Reproduction by Female Laughing Gulls (Larus Atricilla)

The Auk ◽  
2003 ◽  
Vol 120 (2) ◽  
pp. 531-535
Author(s):  
Richard A. Dolbeer ◽  
Glen E. Bernhardt
Keyword(s):  
New York ◽  
Reproductive Effort ◽  
Reproductive Organs ◽  
Egg Laying ◽  
Age Classes ◽  
Left Testis ◽  
One Year ◽  
Ovulatory Follicles ◽  
Laughing Gulls ◽  
Old Females

Abstract The age at which female gulls first reproduce is poorly documented. We examined plumage and reproductive organs of Laughing Gulls (Larus atricilla) collected from May–August 2000–2001 at John F. Kennedy International Airport, New York, to determine age-specific reproductive effort. Each gull was classified as one year old (hatched in previous year), two years old, or ≥3 years old on the basis of color patterns of the hood and tail feathers and fifth primary flight feather. For females, each ovary was examined to determine if post-ovulatory follicles were present. In 2000 and 2001, the first gulls with postovulatory follicles were recorded on 15 and 18 May, respectively. Overall, 54% of the 211 two-year-old female Laughing Gulls collected during June–August showed evidence of egg laying compared to 88% of the 320 gulls ≥3 years old. None of the 50 one-year-old females examined showed evidence of egg laying. Although a lower proportion of two-year-old females laid eggs compared to older gulls, we found no difference (P ≥ 0.06) in mean number of postovulatory follicles or in frequency distribution of numbers of postovulatory follicles for the two age classes for those birds that did lay eggs. Within each sex, mean body mass increased (P < 0.05) with age. Mean left testis length of males increased (P < 0.05) with age. Our findings clearly established that two-year-old female Laughing Gulls can contribute significantly to the annual reproductive effort and that some adult (≥3 years old) females did not lay eggs.

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