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The analysis of the clutch size variability in Cormorant (P. carbo sinensis) was based on study results in colony at the “Jeziorsko Reservoir” (central Poland) in 2004. There were used 328 broods controlled 3-5 times in the season. Number of eggs in a single clutch ranged from 1 to 7, although Cormorants mostly laid 3 to 5 eggs. Mean clutch size was 3.80 (SD = 1.0 0). The size of clutch depended on time of laying eggs and the part of colony where the nest with brood was localised. The clutch size was bigger for pairs that started laying eggs earlier and lower for birds bred in the part of colony where the number of nests and their density were low. Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę.

The evaluation was conducted using the bird species richness and occurrence of the key species. The key species were: 1. Species endangered globally according to IU CN/BirdLife International criteria, 2. Species of European Conservation Concern (C ategory 1-3), 3. Species from Annex I of Council Directive on the Convention of Wild Birds (79/409/EEC) 4. Species from Polish Red Animal Book, 5. Species which frequency of occurrence in Poland is < 10% according to Atlas of Breeding Birds in Poland data, 6 . Species which number of Polish breeding population is less than 1000 pairs. The key species breed in all kinds of habitats in Łódź. The most valuable habitats are weakly urbanized areas of river valleys and forest habitats with old tree-stands. Among the habitats the most endangered by changes are: river valleys and farmland areas. Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę.

During 1966-2009, in 13 seasons, breeding avifauna were counted in Prince J. Poniatowski Park (Łódź). The increase of species richness from 25 (1966) to 35 species (2009) was observed. The species started to breed in the Park were: Mallard Anas plathyrynchos, Sparrowhawk Accipiter nisus, Coot Fulica alra, Wood Pigeon Columba palumbus, Thrush Nightingale Luscinia luscinia, Song Thrush Turdus philom elos, Nuthatch Sitta europaea, Hawfinch Coccothraustes coccothrausles, Goldfinch Carduelis carduelis, Serin Serrinus serinus. Some species disappeared as breeder: Cuckoo Cuculus canorus, Pied Wagtail Molacilla alba, Wood Warbler Phylloscopus sibilatrix, Willow Warbler Phylloscopus trochilus, Marsh Tit Poecile palustris. The significant increase of breeding pairs was observed for: Blackbird Turdus merula. Blackcap Sylvia atricapilla, Great Tit Parus major. Blue Tit Cyanistes caeivleus, Finch Fringilla coelebs. Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę.

The authors evaluated the state of the knowledge of the Łódź Upland (about 18 000 km 2) avifauna. The total of 278 bird species was recorded by authors in the study area since the last century. After 1945, the total of 267 species were recorded, including 180 breeding species. According to the authors’ estimates about 11% of the area was investigated more preciously. The best investigated regions are: the Bzura river valley, 219 species were recorded including 165 breeding ones, the Pilica river valley, where the respective values are 211 and 158, region of the Jeziorsko Reservoir - 247 observed species and 152 breeding ones, the vicinities of the locality of Rogów with 118 breeding species and the Łódź city area with 125 breeding species. The Łódź Upland has been the place o f breeding for some rare birds in Poland: Cormorant, Purple Heron, Lesser Spotted Eagle, Hen Harrier, Montague’s Harrier, Curlew, Ruff, Herring Gull, White-winged Tern, Whiskered Tern, Crane, Stonechat, Collared Flycatcher, Aquatic Warbler, Bearded Tit. Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę.

The eight areas of European or/and domestic importance for birds of Central Poland are presented in this paper. Jeziorsko and Sulejów Reservoirs; valleys of Pilica, Bzura, Ner and Grabia rivers; ponds in Walewice and ponds near Łowicz "Okręt” and "Rydwan” as well as Pilicka Forest and Zaięcze Landscape Park are described in the respect of bird communities and their potential risk assessment. Criteria for identification of other areas of local importance are proposed and 10 subsequent areas fulfilling them are listed. Zadanie pt. „Digitalizacja i udostępnienie w Cyfrowym Repozytorium Uniwersytetu Łódzkiego kolekcji czasopism naukowych wydawanych przez Uniwersytet Łódzki” nr 885/P-DUN/2014 dofinansowane zostało ze środków MNiSW w ramach działalności upowszechniającej naukę.