000			01618nam a2200217 i 4500
999			_c37356 _d37356
001			Rebiun01514268
005			20200515122325.0
008			980906s1990 xxu 000 0 eng d
020			_a0903793032
040			_aES-MaCSI. _bspa. _cVL
080			_a598.2:591.9(410)
245		0	_aPopulation trends in British breeding birds / _cJohn H. Marchant ... et al.]
260			_aNorfolk : _bBritish Trust for Ornithology, _c1990
300			_a300 p.: _bil.
336			_aTexto (visual)
337			_3Impreso _asin mediación
505	0		_aÍndice: Acknowledgements.---1. The Monitoring Schemes.---Bird monitoring and surveillance.---An Introduction to the CBC.---The Waterways Bird Survey.---Integrated population Monitoring.---2. Indexing Population Levels.---The nature of an index.---How the indices are calculated.---Revision of the index figures.---The Reliability of the index data.---The Census plots - sampling problems.---Differences between bird species.---Observer effects.---Analyst effects.---Summary of strengths and weaknesses of the indices.---3. Overall Influeces on Bird Numbers.---Patterns of climate and weather in Britain.---Rainfall patterns in the western Sahel.---Loss of winter habitat for tropical migrants.---Habitat change in the British countryside.---Habitat changes on farmlan.---4. Population Trends.---The Selection of species for review.---The Main systematic section.---Additional species.---References Cited in the Text.---Appendices.---Index of Bird Species Names
650		4	_aAves _xPoblaciones _zGran Bretaña _94156
700	1		_aMarchant, John H. _94157
942			_2cdu _cBK