We analysed data collected by a volunteer-based initiative for rescuing grounded birds, in Mallaig, a village in the west of Scotland. The village is 27km away from the Isle of Rum, the second biggest colony of Manx shearwaters in the world. We investigated how moon and meteorological variables affect the number of birds that were recovered on the ground. We found that during full moon fewer birds ground in the village than during new moon; similar to effects discovered in other studies. In addition we found that strong onshore winds cause more groundings suggesting that birds may be blown towards the village and then being affected by the lights. To a lesser extent, visibility conditions also have an effect on grounding probabilities in Mallaig. Our results can improve rescue campaigns of not only Manx Shearwaters but also other species attracted to light pollution, by predicting conditions leading to an increase in the number of groundings.
More info at:
Syposz M, Gonçalves F, Carty M, Hoppitt W, Manco F (2018) Factors influencing location and number of Manx Shearwater grounding in west Scotland. Ibis, doi.org/10.1111/ibi.12594
Several studies on petrels and shearwaters have shown that light pollution can be harmful for both fledglings and adults, but little is known of the way such anthropogenic elements affect the quality of parental care at the nest. Chick provisioning in petrels and shearwaters occurs exclusively at night and is also negatively correlated with the intensity of moonlight. Thus, we tested the effect of two outdoor disco events, organized during the touristic season, on overnight weight gain in 26 chicks of Scopoli’s shearwaters (Calonectris diomedea) from Linosa Island. The two disco events occurred under contrasting moonlight conditions (moonless vs moonlight). We observed a weight loss in chicks situated closer to disco compared with the control nests located further away. Therefore, this effect was only evident on the moonless night and all the chicks fledged successfully at the end of the breeding season. These results suggest that light disturbances can have a negative effect on parental care, but moonlight might musk the bird’s perception and thus the magnitude of the disturbance. However, it remains crucial to further our understanding of the impact, which touristic anthropogenic activities have on breeding birds, and to identify and effectively manage human activities in important breeding grounds such as Linosa Island, the biggest colony of Scopoli’s shearwater in Europe.
More info at:
Cianchetti-Benedetti M, Becciu P, Massa B, Dell’Omo G. (2018) Conflicts between touristic recreational activities and breeding shearwaters: short-term effect of artificial light and sound on chick weight. Eur J Wildl Res 64: 19
Using data from community-based rescue campaigns and systematic research, we assessed the characteristics of fallout events observed in fledglings of the threatened New Zealand endemic Hutton’s shearwater (Puffinus huttoni) or Kaikōura tītī. Despite strong annual variation in observed fallout numbers, the proportion of annually produced fledglings collected as ‘fallout birds’ remained below 1% each year. Among those, more than 80% survived due to community rescue efforts. Fallout was found to increase significantly during new moon, while weather effects remained inconclusive. Most fallout occurred within brightly lit areas of Kaikōura township, particularly along its coastal roads. High light source densities and high wattage lights appeared to be influential in some areas but could only partly explain the spatial distribution of fallout at this small scale.
More info at:
Deppe, L., Rowley, O., Rowe, L. K., Shi, N., McArthur, N., Gooday, O., & Goldstien, S. J. (2017) Investigation of fallout events in Hutton's shearwaters (Puffinus huttoni) associated with artificial lighting. Notornis 64: 181-191.
After 20 years of outreach activities, the Concejalía Delegada de Medio Ambiente of La Orotava, through its Centro de Educación Ambiental Municipal, organizes the XX Jornadas de Formación Telesforo Bravo from 23 to 27 October 2017. There are a lot of activities (seminars, talks, films and field excursions) with the best naturalists of the Canary Islands. We invite you to assist and we hope you enjoy!
All the details at: XX Jornadas Telesforo Bravo
Studies testing the effect of artificial light characteristics on attractiveness to seabirds have not provided conclusive results and there is some urgency as some endangered petrel species experience high light-induced mortality. We designed a field experiment to test the effect of three common outdoor lighting systems with different light spectra (high pressure sodium, metal halide and white light emitting diode) on the number and the body condition of grounded fledglings of the short-tailed shearwater Ardenna tenuirostris. A total of 235 birds was grounded during 99 experimental hours. 47% of birds was grounded when metal halide lights were on, while light emitting diode and high pressure sodium lights showed lower percentages of attraction (29% and 24%). No differences in body condition were detected among the birds grounded by the different lighting systems. We recommend the adoption of high pressure sodium lights (or with similar spectra) into petrel-friendly lighting designs together with other light mitigation measures such as light attenuation, lateral shielding to reduce spill and appropriate orientation.
Rodríguez A, Dann P, Chiaradia A (2017) Reducing light-induced mortality of seabirds: high pressure sodium lights decrease the fatal attraction of shearwaters. Journal for Nature Conservation 39: 68-72.
Rodríguez A, Moffett J, Revoltos A, Wasiak P, McIntosh RR, Sutherland DR, Renwick L, Dann P, Chiaradia A (2017) Light pollution and seabird fledglings: targeting efforts in rescue programs. Journal of Wildlife Management doi: 10.1002/jwmg.21237
Artificial lights at night cause high mortality of seabirds, one of the most endangered groups of birds globally. Fledglings of burrow-nesting seabirds, and to a lesser extent adults, are grounded by lights when they fly at night. We review the current state of knowledge of light attraction, identify information gaps and propose measures to address the problem. Although other avian families such as Alcidae and Anatidae can be involved, the most affected seabirds are petrels and shearwaters: at least 56 species, more than one-third of them (24) threatened, are grounded by lights. Grounded seabirds have been found worldwide, mainly on oceanic islands but also at some continental locations. Petrel breeding grounds confined to formerly uninhabited islands are particularly at risk from ever-growing levels of light pollution due to tourism and urban sprawl. Where it is impractical to ban external lights, rescue programs of grounded birds offer the most immediate and extended mitigation measures to reduce light-induced mortality, saving thousands of birds every year. These programs also provide useful information for seabird management. However, the data typically are fragmentary and often strongly biased so the phenomenon is poorly understood, leading to inaccurate impact estimates. We identified as the most urgent priority actions: 1) estimation of mortality and impact on populations; 2) assessment of threshold light levels and safe distances from light sources; 3) documenting the fate of rescued birds; 4) improvement of rescue campaigns, particularly in terms of increasing recovery rates and level of care; and 5) research on seabird-friendly lights to reduce attraction. More research is necessary to improve our understanding of this human-wildlife conflict and to design effective management and mitigation measures.
Rodríguez A, Holmes ND, Ryan PG, et al. 2017. A global review of seabird mortality caused by land-based artificial lights. Conservation Biology. DOI: 10.1111/cobi.12900
izeThe last 3rd February 2017, Airam Rodríguez presented the oral communication entitled "Is light pollution a barrier in the breeding habitat of seabirds" in the symposium "Current biodiversity conservation challenges" chaired by M.B. García & J. Lahoz‐Monfort within the XIV MEDECOS & XIII AEET meeting. This contribution is co-authorized by A. Rodríguez, B. Rodríguez, and J.J. Negro from Estación Biológica de Doñana (EBD-CSIC) and Grupo de Ornitología e Historia Natural de las Islas Canarias (GOHNIC) and the abstract reads:
"Many burrow-nesting seabirds are nocturnal at their breeding colonies, i.e. visit the colonies at night. Petrel and shearwater fledglings are attracted and disorientated by artificial lights at night when they leave the nest and fly for first time towards the sea. If they are ground and not rescued, they have a high probability of perishing. In contrast, adults nesting on inland colonies have to cross over the cities or avoid the lit areas to reach their nests several times during the breeding period. How birds manage that situation may offer useful information to minimise light-induced mortality. Our aim is to study the behaviour of Cory’s shearwaters Calonectris diomedea borelais during the commuting flights (adults) or dispersal (fledglings) to their breeding colonies in relation to spatial distribution of light pollution. We use GPS data-loggers to track birds from several colonies on Tenerife, Canary Islands. Nocturnal satellite imagery is employed to evaluate the spatial distribution of light polluted areas. While fledglings are attracted and grounded in the closest lights to their natal colonies, adults fly over the cities without apparently avoiding artificial lights by using the shortest distance from coastlines to their colonies. Due to high elevation of nesting colonies, return flights were longer than outgoing flights as adults glided from colony to the ocean. Artificial lights do not seem to be a problem for adult shearwaters attending their nesting colonies, but constitute an important barrier for fledglings’ dispersal."
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