Wyniki wyszukiwania - BazTech

1

Temporal Patterns of Wetland-Associated Bird Assemblages in Altered Wetlands in Turkey

Keten Akif, Sarcan Erdinc, Anderson James T.

Polish Journal of Ecology

|

2019

|

Vol. 67, nr 4

316--330

EN

A loss of wetlands, one of the highly sensitive ecosystems, necessitates the monitoring and assessment of wildlife population trends for the continuity and sustainable management of species. The goal of our study was to evaluate temporal changes in wetland-associated bird composition by conducting monthly counts during December 2006 - November 2007 and March 2015 - February 2016 in Efteni Lake, Duzce, Turkey. This lake has been exposed to structural change including shoreline length, area and depth for the last 50 years. Wetland-associated bird richness decreased, and abundance increased during the decade, but this change was not significant except for two species with an increased population, ferruginous duck Aythya nyroca and great crested grebe Podiceps cristatus. Cluster analyses resulted in two groups: the breeding season from April to September, and the non-breeding season from October to March. The most numerous species were observed mostly during the non-breeding season. Some guilds, including diving carnivores, omnivores, shoreline omnivores and herbivores species were more prevalent during the non-breeding season. The insectivores had higher population densities during the breeding season. Thus, wetland-associated bird abundance during the non-breeding season was higher than during the breeding season, although species richness was the opposite. The planned restoration of habitats of Efteni Lake should have a positive impact on birds by creating more space available to them. Our result should help to better understand the impact of habitat changes on waterbird assemblages. Long-term monitoring of Efteni Lake will be useful for the wetland-associated avian community, and for other animal and plant communities.

2

Seasonal Changes in the Diversity and Numbers of Waterbirds in a Tropical River in Southern Africa

Kopij G., Paxton M.

Polish Journal of Ecology

|

2018

|

Vol. 66, nr 3

257--269

EN

Although freshwater habitats play a crucial role in most ecosystems in the world, little is known on their functioning in tropical regions even in regard to the most often studied avian communities. In this study, counts on waterbirds were conducted in dry and wet season (in years 2001-2008) in a riverine habitat in southern Africa (Shamvura stretch of the Okavango River). In total, 84 waterfowl species were recorded. The birds were assigned to different guilds according to their migration activity, diet and nesting site selection. In overall, the species number was almost the same (74 vs. 73) in the wet and dry season. The abundance of all resident species recorded was lower in wet (N = 5992) than in dry seasons (N = 6965)(χ2 = 73.1, P < 0.01). In both seasons Palearctic migrants were represented by seven species, which comprised 1-2% of all waterbirds. Six species were classified as dominants: African reed cormorant Phalacrocorax africanus, African openbill stork Anastomus lamelligerus, cattle egret Bubulcus ibis, wattled lapwing Vanellus senegallus, African darter Anhinga rufa and white-faced duck Dendrocygna viduata. In the wet season the dominant species comprised 68%, while in dry season – 52.5% of all birds recorded. Significant seasonal differences in the numbers of individuals were shown for the following species: African reed cormorant, great egret, squacco heron, wattled lapwing and pied kingfisher. Insectivorous and omnivorous birds were more abundant in wet season, while piscivorous, carnivorous and plant eating birds in dry season. These differences can be related mainly to seasonal variation in the availability of food as well as to the timing of breeding.

3

Reproductive parameters of Caspian Gull Larus cachinnans Pallas, 1811 in different habitats nearby and away fish ponds

Gwiazda R., Neubauer G., Betleja J., Bednarz Ł., Zagalska-Neubauer M.

Polish Journal of Ecology

|

2015

|

Vol. 63, nr 1

159--165

EN

Reproductive performance of gulls depends on a variety of factors, but food abundance and its availability are among the most important. Clutch and egg sizes in gulls are found to be strongly influenced by food availability, thus better reproductive performance in the colony with greater fish availability (near fish ponds) was expected in that study. We compared the reproductive traits (clutch size, volume of eggs in the full clutch, relative volume of the C-egg (the third egg in gull’s clutches) and hatching success) of Caspian Gull Larus cachinnans in five inland colonies in Poland located at a gravel pit, a lake, a river and two dam reservoirs. Differences in the clutch size between sites were found, with the lowest at a lake. We found similar clutch volume in all studied colonies. C-eggs were slightly smaller than A- and B- eggs, in all colonies and all study years, but the relative volume of C-egg in colonies located near fish ponds (<10 km) was significantly greater compared to colonies located far away. This may be explained by high fish availability in fishponds in comparison to other habitats. However hatching success (the ratio of the number of hatched chick to the number of eggs laid) was highest in the colony at the lake. This indicates that both inland habitats a gravel pit and a lake offered good food conditions for large gulls when fish ponds are nearby.

4

Zimowanie ptaków wodnych w miastach

Dolata P. T.

Przegląd Komunalny

|

2002

|

nr 11

38-39

PL

Coraz częściej można spotkać, szczególnie zimą, w polskich miastach duże stada ptaków wodnych. Jest to zjawisko stosunkowo nowe, a jego skala szybko wzrasta. Mogą być z tym związane pewne problemy, które muszą rozwiązywać służby miejskie. Wszystkie te ptaki podlegają bowiem ochronie prawnej.