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Factors affecting the breeding success of the grey heron (Ardea cinerea) in northern Poland
- D. Jakubas
- Environmental ScienceJournal of Ornithology
In the studied colonies, the number of feeding visits was the most important factor affecting breeding success and chick mortality significantly decreased with increasing numbers of feeding visit per nest.
Climate change and phenological responses of two seabird species breeding in the high-Arctic
This study identifies some spring environ- mental factors important for regulating the timing of breeding in the high-Arctic, most likely through effects on snow cover limiting access to nest sites and the development of the polar marine food web.
Diversification of Nitrogen Sources in Various Tundra Vegetation Types in the High Arctic
- G. Skrzypek, B. Wojtun, Dorota Richter, D. Jakubas, K. Wojczulanis-Jakubas, A. Samecka-Cymerman
- Environmental SciencePloS one
- 16 September 2015
The stable nitrogen isotope mixing mass balance indicates the ratio between the actual N-loads acquired by plants from different N-sources in the Arctic tundra and the used methodological approach can be applied elsewhere.
Foraging closer to the colony leads to faster growth in little auks
Investigation of foraging trips of a small planktivorous alcid, the little auk Alle alle, using miniature GPS loggers finds chicks in the Arctic environment achieved both peak body mass and fledging age earlier, suggesting faster chick growth than in the Atlantic environment.
Faeces deposition and numbers of vertebrate herbivores in the vicinity of planktivorous and piscivorous seabird colonies in Hornsund, Spitsbergen
Number of her− bivores and their faeces deposition level recorded nearby planktivorous seabird colony were greater as compared to those found nearby the colony of piscivores, pointing out that vertebrates concentrate and feed more intensively on rich ornithogenic pastures.
The impact of different hydrographic conditions and zooplankton communities on provisioning Little Auks along the West coast of Spitsbergen
The Response of the Grey Heron to a Rapid Increase of the Round Goby
- D. Jakubas
- Environmental Science
- 1 September 2004
Abstract The fish community of the Gulf of Puck in the Baltic Sea has changed in recent years following the successful introduction of the Round Goby (Neogobius melanostomus). The first specimen of…
Predicting the Sex of Dovekies by Discriminant Analysis
Analysis of measurements of mated pairs showed that males are usually bigger than females in case of head-bill length, bill width and body mass in Dovekie, a species having a high degree of overlap between the sexes.
Diet composition and food consumption of the grey heron (Ardea cinerea) from breeding colonies in northern Poland
- D. Jakubas, Agnieszka Mioduszewska
- Environmental ScienceEuropean Journal of Wildlife Research
- 28 June 2005
The impact of herons on fish communities was much lower than other losses due to predation (herons from Kąty Rybackie caught only 6% of fishermen bycatch, birds from Mosty took 10–14% of round gobies eaten by cormorants).
Response of Dovekie to Changes in Food Availability
Abstract Dovekie (Alle alle) parents feed their chicks almost exclusively with high energy Arctic zooplankton associated with cold polar waters. In years with a stronger influx of warm Atlantic…