Light pollution causes object collisions during local nocturnal manoeuvring flight by adult Manx Shearwaters Puffinus puffinus
* Correspondence author. Email: firstname.lastname@example.org
Understanding the detrimental effects of anthropogenic light on nocturnally mobile animals is a long-standing problem in conservation biology. Seabirds such as shearwaters and petrels can be especially affected, perhaps because of their propensity to fly close to the surface, making them vulnerable to encountering anthropogenic light sources. We investigated the influence of light pollution on adult Manx Shearwaters Puffinus puffinus at close range in foggy conditions. We recorded collisions with a building at a breeding colony for six consecutive pairs of intervals in which the house lights were left on as normal for 135 seconds, then turned off for 135 seconds. The relationship between lighting condition and collision frequency was highly significant, with a collision rate in the presence of lighting around 25 times that in its absence. Our results show that birds were clearly affected by the lights, by being either directly attracted, or disorientated during flight close to the structure. This could have been due to the light source itself, or an indirect effect of the all-round reflective glow in the fog perhaps interfering with visual or magnetic control inputs on both sides of the bird simultaneously. Our results suggest a mechanism by which the screening of artificial lights close to shearwater breeding areas, at least during foggy nights, could lead to improved welfare and survival at breeding colonies.
Understanding the detrimental effects of anthropogenic light on nocturnally mobile animals is a long-standing problem in conservation biology (Montevecchi 2006; Gaston et al. 2013; Gaston et al. 2014). Artificial light at night can draw individuals from long distances, whilst repelling others, affecting many activities including foraging (e.g. Garber 1978; Frank 2009; Pereszlényi et al. 2017), reproductive behaviour (e.g. Miller 2006; Kempenaers 2010; de Jong et al. 2015; Russ et al. 2017), and daily, monthly or annual movements (e.g. Salmon 2003; Mathews et al. 2015; Rodríguez et al. 2017).
Amongst the most endangered groups of birds (Croxall et al. 2012), shearwaters and petrels (Procellariiformes) are especially badly affected by anthropogenic light sources and the grounding of their fledglings, in particular, has been studied in many parts of the world (Rodríguez et al. 2017). Manx Shearwaters Puffinus puffinus, which breed at island colonies predominantly around the British Isles, are classified as of Least Concern by the International Union for the Conservation of Nature (IUCN), but still they are often reported grounding in artificially lit urban areas or at other light sources particularly during the fledging period (Brooke 1990; Le Corre et al. 2002; Rodríguez et al. 2008; Miles et al. 2010; Archer et al. 2015). There are fewer studies on the grounding of adults on land, in this or other species, since adults usually constitute a small percentage of the individuals affected in any fallout (Telfer et al. 1987; Le Corre et al. 2002; Rodríguez & Rodríguez 2009).
Here we report a short experiment designed to test the instantaneous effect of anthropogenic house light on collisions with a man-made object, and outside of the fledging period when only adults are present at breeding colonies. Electric lighting is used to provide night service to the seasonal residents (a nightly summer maximum of 42 staff and tourists, of which up to 10 might stay in the Island Office) of the several buildings on Skomer Island National Nature Reserve (NNR), an internationally important Manx Shearwater breeding colony. Manx Shearwaters returning to the colony sometimes collide with the buildings and higher numbers of crashing seabirds are expected on cloudy and rainy nights (Jones 1980; Telfer et al. 1987). It may be that more birds visit breeding colonies in such conditions anyway, when there is less ambient light from the moon (Riou & Hamer 2008), but it is also possible that visual guidance in local manoeuvring flight is less effective and this contributes to collision risk. To determine whether there is a local effect of artificial light on collisions with the structure from which it is emanating, we conducted a very short experiment.
We would like to thank the Skomer and Skokholm Islands Conservation Advisory Committee, the Wildlife Trust for South and West Wales, and Natural Resources Wales.
Departure of Manx Shearwater Puffinus puffinus fledglings from Bardsey, Gwynedd, Wales, 1998 to 2013. Seabird 28: 43–47.
Light induced seabird mortality on vessels operating in the Southern Ocean: incidents and mitigation measures. Antarctic Science 17: 67–68.
The Manx Shearwater. T. & A.D. Poyser, London.
Seabird conservation status, threats and priority actions: a global assessment. Bird Conservation International 22: 1–34.
Decline of Townsend’s (Newell’s) Shearwaters (Puffinus auricularis newelli) on Kauai, Hawaii. Auk 120: 669–679.
Effects of nocturnal illumination on life-history decisions and fitness in two wild songbird species. Philosophical Transactions of the Royal Society of London B 370: 20140128.
The impact of introduced predators, lightinduced mortality of fledglings and poaching on the dynamics of the Cory’s Shearwater (Calonectris diomedea) population from the Azores, northeastern subtropical Atlantic. Biological Conservation 144: 1998–2011.
Exploitation of artificial light at night by a diurnal jumping spider. Peckhamia 78: 1–3.
Opportunistic feeding behavior of Anolis cristatellus (Iguanidae: Reptilia) in Puerto Rico. Transactions of the Kansas Academy of Science 81: 79–80.
The ecological impacts of nighttime light pollution: a mechanistic appraisal. Biological Reviews 88: 912–927.
Demographic effects of artificial nighttime lighting on animal populations. Environmental Reviews 22: 323–330.
Reduced seabird night strikes and mortality in the Tristan rock lobster fishery. African Journal of Marine Science 35: 589–592.
GPS tracking of the foraging movements of Manx Shearwaters Puffinus puffinus breeding on Skomer Island, Wales. Ibis 150: 462–473.
The sun compass revisited. Animal Behaviour 97: 135–143. Hore, P. & Mouritsen, H. 2016. The radical-pair mechanism of magnetoreception. Annual Review of Biophysics 45: 299–344.
The effect on birds of a North Sea gas flare. British Birds 73: 547–555. Kempenaers, B., Borgström, P., Loës, P., Schlicht, E. & Valcu, M. 2010. Artificial night lighting affects dawn song, extra-pair siring success, and lay date in songbirds. Current Biology 20: 1735–1739.
Light-induced mortality of petrels: a 4-year study from Réunion Island (Indian Ocean). Biological Conservation 105: 93–102.
Barriers and benefits: implications of artificial night-lighting for the distribution of common bats in Britain and Ireland. Philosophical Transactions of the Royal Society of London B 370: 20140124.
Effects of artificial lights and moonlight on petrels at St Kilda. Bird Study 57: 244–251.
Apparent effects of light pollution on singing behavior of American Robins. Condor 108: 130–139.
Influences of artificial light on marine birds. In: Rich, C. & Longcore, T. (eds.) Ecological Consequences of Artificial Night Lighting: 94–113. Island Press, Washington.
In situ clock shift reveals that the sun compass contributes to orientation in a pelagic seabird. Current Biology 28: 275–279.
Atypical feeding of woodpeckers, crows and redstarts on mass-swarming Hydropsyche pellucidula caddis flies attracted to glass panes. Urban Ecosystems 20: 1203–1207.
A whole-island census of the Manx Shearwaters Puffinus puffinus breeding on Skomer Island in 2011. Seabird 25: 1–13.
Light attraction in endangered procellariiform birds: reduction by shielding upward radiation. Auk 102: 377–383.
Seabird vision: spectral sensitivity and light-attraction behaviour. PhD Thesis, University of Wisconsin-Madison.
Predation risk and reproductive effort: impacts of moonlight on food provisioning and chick growth in Manx Shearwaters. Animal Behaviour 76: 1743–1748.
Fatal Attraction of Short-Tailed Shearwaters to Artificial Lights. PLoS ONE 9: e110114.
Seabird mortality induced by land-based artificial lights. Conservation Biology 31: 986–1001.
Attraction of petrels to artificial lights in the Canary Islands: effects of the moon phase and age class. Ibis 151: 299–310.
Status and conservation requirements of Manx shearwaters Puffinus puffinus on Tenerife (Canary Islands). Alauda 76: 72–74.
GPS tracking for mapping seabird mortality induced by light pollution. Scientific Reports 5: 10670.
Altered breeding biology of the European Blackbird under artificial light at night. Journal of Avian Biology 48: 1114–1125.
Artificial night lighting and sea turtles. Biologist 50: 163–168. Syposz, M., Gonçalves, F., Carty M, Hoppitt, W. & Manco, F. 2018. Factors influencing location and number of Manx Shearwater grounding in west Scotland. Ibis 160: 846–854.
Attraction of Hawaiian seabirds to lights: conservation efforts and effects of moon phase. Wildlife Society Bulletin 15: 406–413.