Behaviour of Pigeon Excreta on Masonry Surfaces

Abstract Pigeon droppings are implicated in spoiling and decay of buildings. Several studies have examined the effects and chemistry of accumulations of pigeon droppings under highly localised pigeon roosts. Scant information exists on the impact caused by individual pigeon droppings at perch sites, even though these constitute the majority of bird use in urban areas. This study experimentally examined the processes that affect masonry immediately after pigeon excreta have been voided from the body and what effects discrete, fresh pigeon droppings have on different kinds of sandstone. The experiments demonstrated the susceptibility of freshly deposited excreta to environmental conditions (relative humidity and precipitation). In real-life situations, with pigeon excreta deposited on window ledges, cornices and parapets, the majority of damage would occur within the first two weeks of deposition. After that, the majority of individual droppings would have either dissolved or desiccated to such a degree that they would have rolled off. Much of the observed staining is superficial. While individual bird droppings make a building look dirty, even for months at a time, the effect on the building material is not substantial unless other factors come into play such as colonisation of the excreta by mould or leaching of salts from the excreta.

[1]  C. Saiz-Jimenez,et al.  Lichens and bryophytes as agents of deterioration of building materials in Spanish cathedrals , 1991 .

[2]  D. Spennemann,et al.  Impact of Tropical vegetation On World War II-Era cultural resources in the Marshall Islands , 2006 .

[3]  J. Sanjurjo-Sánchez,et al.  Decay effects of pollutants on stony materials in the built environment , 2012, Environmental Chemistry Letters.

[4]  D. Spennemann,et al.  Dietary habits of urban pigeons (Columba livia) and implications of excreta pH – a review , 2017 .

[5]  L. Sivars,et al.  Causes and consequences of mass loss upon predator encounter: feeding interruption, stress or fit‐for‐flight? , 2000 .

[6]  T. Caro,et al.  Antipredator Defenses in Birds and Mammals , 2006 .

[7]  R. Armstrong.  The influence of bird droppings and uric acid on the radial growth of five species of saxicolous lichens , 1984 .

[8]  G. Janssens,et al.  Nutrition of the domestic pigeon (Columba livia domestica) , 2003 .

[9]  M. Hughes.  Cloacal and salt-gland ion excretion in the seagull, Larus glaucescens, acclimated to increasing concentrations of sea water. , 1970, Comparative biochemistry and physiology.

[10]  A. Tuen,et al.  Bird Diets in Urban Environments: The Case of the Asian Glossy Starling, Aplonis panayensis , 2016 .

[11]  D. Haag-Wackernagel,et al.  Effectiveness of Gel Repellents on Feral Pigeons , 2013, Animals : an open access journal from MDPI.

[12]  M. Bassi,et al.  The role of pigeon excrement in stone biodeterioration , 1976 .

[13]  J. Webb,et al.  Fluviodeltaic sedimentology and ichnology of part of the Silurian Grampians Group, western Victoria , 2003 .

[14]  Anders Hård,et al.  NCS—Natural Color System: A Swedish Standard for Color Notation , 1981 .

[15]  D. Buruiana,et al.  ARE BIRDS A MENACE TO OUTDOOR MONUMENTS ? , 2010 .

[16]  R. Armstrong.  Field experiments on the dispersal, establishment and colonization of lichens on a slate rock surface , 1981 .

[17]  J. Braams,et al.  Biodeterioration of stone: a review , 2000 .

[18]  E. Caviedes-Vidal,et al.  Feral pigeons in urban environments: dietary flexibility and enzymatic digestion? , 2005 .

[19]  D. Spennemann,et al.  Effects of acid pigeon excreta on building conservation , 2017 .

[20]  D. Spennemann,et al.  Bird impacts on heritage buildings , 2018 .

[21]  J. Thompson,et al.  Ecological Studies of the Feral Pigeon Columba livia var. I. Population, Breeding Biology and Methods of Control , 1972 .

[22]  D. Sol,et al.  Age-related feeding site selection in urban pigeons (Columba livia): experimental evidence of the competition hypothesis , 2000 .

[23]  M. Rashotte,et al.  Adaptive timing of digestion and digestion-related thermogenesis in the pigeon , 2003, Physiology & Behavior.

[24]  A. Gorbushina,et al.  Distribution of microorganisms on ancient wall paintings as related to associated faunal elements , 2000 .

[25]  P. Tryjanowski,et al.  The effect of habitat and number of inhabitants on the population sizes of feral pigeons around towns in northern Poland , 2011, European Journal of Wildlife Research.

[26]  M. Gómez-Heras,et al.  Soluble salt minerals from pigeon droppings as potential contributors to the decay of stone based Cultural Heritage , 2004 .

[27]  Dennis Allsopp,et al.  Introduction to biodeterioration , 1986 .

[28]  T Mansfield.  The cost of stone building soiling in Sydney , 1990 .

[29]  F. Rull,et al.  Linking groundwater pollution to the decay of 15th-century sculptures in Burgos Cathedral (northern Spain) , 2015, Environmental Science and Pollution Research.

[30]  J. Suhonen,et al.  Distribution and habitat selection of wintering birds in urban environments , 1998 .

[31]  Antonia Moropoulou,et al.  Salt-induced decay in calcareous stone monuments and buildings in a marine environment in SW France , 2003 .

[32]  R. Johnston.  FERAL PIGEONS by , 2012 .

[33]  R. Henderson,et al.  Nocturnal digestion, cloacal excretion, and digestion-related thermogenesis in pigeons (Columba livia) , 1997, Physiology & Behavior.

[34]  Daniel Sol,et al.  Competition for Food in Urban Pigeons: The Cost of Being Juvenile , 1998 .

[35]  D. Spennemann,et al.  Building use by urban commensal avifauna in Melbourne central business district, Australia , 2017 .

[36]  R. Fort,et al.  Black Layers of Decay and Color Patterns on Heritage Limestone as Markers of Environmental Change , 2016 .

[37]  L. Giraldeau,et al.  Large‐scale Input Matching by Urban Feral Pigeons (Columba livia) , 2009 .

[38]  M. Egan,et al.  Salt weathering and experimental desalination treatment of building sandstone, Sydney (Australia) , 2011 .

[39]  M. Al-Mukhtar,et al.  The Effect of Biodeterioration by Bird Droppings on the Degradation of Stone Built , 2015 .

[40]  Dario Camuffo,et al.  Physical weathering of stones , 1995 .

[41]  R. Fort,et al.  Anthropic effect on the lichen colonization in building stones from cultural heritage , 2015 .

[42]  R. D. Wakefield,et al.  An introduction to stone colonizing micro-organisms and biodeterioration of building stone , 1998, Quarterly Journal of Engineering Geology.

[43]  J. V. van Wijnen,et al.  Survey of feral rock doves (Columba livia) in Amsterdam, a bird-human association , 2001, Urban Ecosystems.

[44]  Cristina Sabbioni,et al.  Chemical and biological weathering of an historical building: Reggio Emilia Cathedral , 1986 .