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143 results for “Artificial light”

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dryad32/100

Data from: Singing from North to South: latitudinal variation in timing of dawn singing under natural and artificial light conditions

1. Animals breeding at northern latitudes experience drastic changes in daily light conditions during the breeding season with decreasing periods of darkness, whereas those living at lower latitudes are exposed to naturally dark nights throughout the year. Nowadays, many animals are also exposed to artificial night lighting (often referred to as light pollution). 2. Animals strongly rely on variation in light levels to time their daily and seasonal behaviour. Previous work on passerine birds showed that artificial night lighting leads to earlier onset of dawn song. However, these studies were carried out at intermediate latitudes with more limited seasonal changes in daylength, and we still lack an understanding of the impact of artificial night lighting in relation to variation in natural light conditions. 3. We investigated the influence of natural and artificial light conditions on the timing of dawn singing in five common songbird species in each of three regions in Europe that differed in natural variation in daylength (northern Finland, 65°N; southern Germany, 48°N; southern Spain, 37°N). In each region, we selected five peri-urban forest sites with and five without street lighting, and recorded dawn singing at the beginning of the local breeding season. 4. Our results show that the earliest natural singers, i.e., European robins (Erithacus rubecula) and common blackbirds (Turdus merula), started dawn singing earlier along with the natural increase in night brightness in Finland, with no additional effects of artificial night lighting. In contrast, the later singers, i.e., great tits (Parus major), blue tits (Cyanistes caeruleus), and chaffinches (Fringilla coelebs), showed similar onsets of dawn song relative to sunrise across the season and similar effects of artificial night lighting at all latitudes. 5. Artificial night lighting affected great tits, blue tits and chaffinches even in northern Finland where nights became very bright. Proximate factors such as differential light sensitivities may explain why early singers showed more plastic behavioural responses to naturally and artificially bright nights. The maintenance of rhythmicity in the late singers during bright northern nights and under artificial night lighting may also be an adaptive response to predation risk or costs of sleep loss.

opencc-zeroDec 2016View details →

dryad32/100

Data from: Artificial light at night may decrease predation risk for terrestrial insects

<p>Artificial light at night (ALAN) is thought to be detrimental for terrestrial insect populations. Whilst there exists evidence for lower abundance under ALAN, underlying mechanisms remain unclear. One mechanism by which ALAN may contribute to insect declines may be through facilitating increased predation. We investigated this by experimentally manipulating insect-substitute abundance under differential levels of light. We used insect-containing birdfeed placed at varying distances from streetlights as a proxy for terrestrial insects, inspecting the rate of predation before and after dusk (when streetlights are respectively off and on). We found that there was a significantly greater effect of increasing distance on predation after dusk, suggesting that predation was actually reduced by greater levels of artificial light. This may occur because ALAN also increases the vulnerability of insectivores to their own predators. Implications for foraging behaviour and alternative explanations are discussed.</p>

opencc-zeroNov 2022View details →

zenodo32/100

FIGURE 2. Bipalium admarginatum, live specimens photographed under artificial light. A in Rediscovery of Bipalium admarginatum de Beauchamp, 1933 (Platyhelminthes Tricladida, Geoplanidae) in Malaysia, with molecular characterisation including the mitogenome

FIGURE 2. Bipalium admarginatum, live specimens photographed under artificial light. A, specimen MNHN JL354; B, Specimen MNHN JL355. Photos by George Verdon.

opennotspecifiedMay 2023View details →

dryad32/100