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

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

Identyfikatory

DOI

10.3161/15052249PJE2015.63.1.014

• Języki publikacji: EN

Abstrakty

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.

Słowa kluczowe

EN

clutch size; eggs volume; foraging areas; hatching success; relative egg size; water birds

PL

jajo; wielkość; obszar żerowania; wylęganie; ptaki wodne

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2015
• Tom: Vol. 63, nr 1
• Strony: 159--165
• Opis fizyczny: Bibliogr. 27 poz., rys., tab., wykr.

Twórcy

autor

Gwiazda R.

• Karol Starmach Department of Freshwater Biology, Institute of Nature Conservation, Polish Academy of Sciences, Mickiewicza 33, 31-120 Kraków, Poland

autor

Neubauer G.

• Ornithological Station, Museum and Institute of Zoology, Polish Academy of Sciences, Nadwiślańska 108, 80-680 Gdańsk, Poland

autor

Betleja J.

• Department of Natural History, Upper Silesian Museum, sq. Jana III Sobieskiego 2, 41-902 Bytom, Poland

autor

Bednarz Ł.

• Spółdzielcza 34, 24-220 Niedrzwica Duża, Poland

autor

Zagalska-Neubauer M.

• Ornithological Station, Museum and Institute of Zoology, Polish Academy of Sciences, Nadwiślańska 108, 80-680 Gdańsk, Poland

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