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Is the body condition of the three-spined stickleback (Gasterosteus aculeatus) determined by the type of food consumed?

Pawelec A. J., Sapota M. R., Skóra M. E.

Oceanological and Hydrobiological Studies

2016

Vol. 45, No. 4

588--599

The three spine stickleback Gasterosteus aculeatus is a small omnivorous, wildly distributed fish. In this study, food uptake and body condition of three spine stickleback, from the Gulf of Gdansk eulitoral was investigated. Samples were taken from three locations of the Gulf of Gdańsk: in vicinities of Sopot, Chałupy and Hel. Copepods were the most quantitive food components in the three spine stickleback stomachs. In spring, at Hel station -Harpacticoida and in Sopot, crustacean and fish eggs, were dominating as a fish prey. During summer, Calanoida were most abundant in stomachs collected from fish caught in Chałupy, fish eggs and Calanoida in those from Hel station. In stomachs of fish from Sopot location most common prey were Cladocera. Comparison of stomach content to food base and Fulton’s body condition index revealed that the three spine stickleback uses available food base in efficient way.

Timing of autumn migration and biometric characteristics of migrating populations of european Robin (Erithacus rubicola L. 1958) in north-eastern Poland

Polakowski M., Jankowiak Ł.

Polish Journal of Ecology

2012

Vol. 60, nr 4

797--804

We studied the autumn migration of the European robin (Erithacus rubecula) through north-eastern Poland. During the study period 2002–2004 we analysed a total of 2375 individuals: 1991 first-year birds and 349 adults. First-year birds had shorter wings than adults. Body condition was influenced by age, year of migration fat content and arrival time. Our results show that first-year birds arrived earlier, had low-fat levels and were in a comparatively poorer body condition to that of the adults and were less effective foragers. Stopover length decreased during the migration season for both age groups as a result of rush to their wintering areas because of winter approach. We found that adult females arrived later than adult males.