Predicting densities of wintering Redshank Tringa totanus from estuary characteristics: a method for assessing the likely impact of habitat change

• Autorzy: Rehfisch M M , Austin G E , Clark N A , Clarke R T , Holloway S J , Yates M G , Durell S E A , Eastwood J A , Goss-Custard J D , Swetnam R D , West J R

Warianty tytułu

PL

Prognozowanie zageszczen zimujacych brodzcow krwawodziobych w oparciu o charakterystyke estuariow - szacowanie oddzialywania zmian srodowiskowych

• Języki publikacji: EN

Abstrakty

EN

The UK's estuaries are internationally important for wintering waterfowl and yet these habitats are subject to a range of pressures. For example, some 88% of them have been affected by landclaim. This stress to estuaries will be compounded by global climate change, which will lead to sea level rise. It would be valuable, therefore, to be able to predict the likely impact of such pressures on waterfowl using estuaries. This paper presents a method, based on environmental variables that can easily be collected, which allows the effect of habitat change on densities of wintering waterfowl to be predicted for individual estuaries. The application of the methodology is demonstrated in detail for Redshank. Waterfowl counts were carried out two hours either side of low tide over two winters at 27 estuarine sites in Britain. The sediment classification was obtained from the interpretation of airborne or satellite thematic imagery. The morphology of each site was measured largely from maps. A combination of estuary length, estuary width, tidal range and longitude describe 87% of the variance in the whole estuary Redshank densities. A model based on sediment, the proportion of mud in estuaries, explained 48% of the variance. The suspected reasons behind the higher predictive potential of the former model are discussed. Two examples of the use of these models in predicting the likely effects of human developments on waterfowl populations are demonstrated. Further development of the models is suggested which would allow them to be applied to an important conservation issue, global climate change.

PL

Ujścia wielu brytyjskich rzek mają międzynarodowe znaczenie dla zimujących ptaków wodnych i wodno-błotnych — stanowią ok. 28% estuariów atlantyckich i basenu M. Północnego. Jednocześnie są to środowiska podlegające ciągłej presji szeregu czynników. Jedno z ważniejszych wiąże się z globalnymi zmianami klimatycznymi, mogącymi mieć wpływ na podniesienie się poziomu mórz. Celowa wydaje się zatem umiejętność przewidywania prawdopodobnego wpływu różnych negatywnych czynników na ptaki wodne wykorzystujące estuaria. Prezentowana praca przedstawia metodę opartą na analizie łatwo mierzalnych zmian zachodzących w środowisku (Tab. 1), umożliwiającą szacowanie wpływu zmian siedliskowych na zagęszczenia zimujących ptaków wodnych w poszczególnych estuariach. Zastosowanie wspomnianej metody przedstawione na przykładzie brodźca krwawodziobego. Liczenia ptaków przeprowadzono w czasie dwóch zim na obszarze 27 brytyjskich estuariów (Fig 1). Klasyfikację osadów przeprowadzono na podstawie zdjęć lotniczych lub satelitarnych. Strukturę terenu określano w większości z pomocą map. Zestawienie długości i szerokości ujścia a także zakres i czas przepływu opisywało 87% zmienności w zagęszczeniach brodźców krwawodziobych na całym obszarze estuarium. Model oparty na klasyfikacji osadów, udziale mułu w estuariach wyjaśniał 48% zmienności (Fig. 2, Tab. 2).

Słowa kluczowe

PL

ptaki; zmiany siedliskowe; ptaki wodne; zmiany srodowiska; estuaria; zimowanie zwierzat; prognozowanie; brodziec krwawodzioby; ornitologia; zageszczenie populacji

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2000
• Tom: 35
• Numer: 1
• Opis fizyczny: s.25-32.rys.,tab.,bibliogr.

Twórcy

autor

Rehfisch M M

• British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, United Kingdom

autor

Austin G E

• British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, United Kingdom

autor

Clark N A

• British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, United Kingdom

autor

Clarke R T

• Institute for Terrestrial Ecology, Monks Wood, Abbots Ripton, Huntingdon, Cambs, PE17 2LS, United Kingdom

autor

Holloway S J

• British Trust for Ornithology, The Nunnery, Thetford, Norfolk IP24 2PU, United Kingdom

autor

Yates M G

• Institute for Terrestrial Ecology, Furzebrook Research Station, Wareham, Dorset BH20 5AS, United Kingdom

autor

Durell S E A

• Institute for Terrestrial Ecology, Monks Wood, Abbots Ripton, Huntingdon, Cambs, PE17 2LS, United Kingdom

autor

Eastwood J A

• Institute for Terrestrial Ecology, Furzebrook Research Station, Wareham, Dorset BH20 5AS, United Kingdom

autor

Goss-Custard J D

• Institute for Terrestrial Ecology, Monks Wood, Abbots Ripton, Huntingdon, Cambs, PE17 2LS, United Kingdom

autor

Swetnam R D

• Institute for Terrestrial Ecology, Furzebrook Research Station, Wareham, Dorset BH20 5AS, United Kingdom

autor

West J R

• School of Civil Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom

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