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Author |
Luarte, T.; Bonta, C.C.; Silva-Rodriguez, E.A.; Quijon, P.A.; Miranda, C.; Farias, A.A.; Duarte, C. |
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Title |
Light pollution reduces activity, food consumption and growth rates in a sandy beach invertebrate |
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Journal Article |
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Year |
2016 |
Publication |
Environmental Pollution (Barking, Essex : 1987) |
Abbreviated Journal |
Environ Pollut |
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Volume |
218 |
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1147-1153 |
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Animals |
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Abstract |
The continued growth of human activity and infrastructure has translated into a widespread increase in light pollution. Natural daylight and moonlight cycles play a fundamental role for many organisms and ecological processes, so an increase in light pollution may have profound effects on communities and ecosystem services. Studies assessing ecological light pollution (ELP) effects on sandy beach organisms have lagged behind the study of other sources of disturbance. Hence, we assessed the influence of this stressor on locomotor activity, foraging behavior, absorption efficiency and growth rate of adults of the talitrid amphipod Orchestoidea tuberculata. In the field, an artificial light system was assembled to assess the local influence of artificial light conditions on the amphipod's locomotor activity and use of food patches in comparison to natural (ambient) conditions. Meanwhile in the laboratory, two experimental chambers were set to assess amphipod locomotor activity, consumption rates, absorption efficiency and growth under artificial light in comparison to natural light-dark cycles. Our results indicate that artificial light have significantly adverse effects on the activity patterns and foraging behavior of the amphipods, resulting on reduced consumption and growth rates. Given the steady increase in artificial light pollution here and elsewhere, sandy beach communities could be negatively affected, with unexpected consequences for the whole ecosystem. |
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Departamento de Ecologia y Biodiversidad, Facultad de Ecologia y Recursos Naturales, Universidad Andres Bello, Republica no. 440, Santiago, Chile; Center for the Study of Multiple-drivers on Marine Socio-ecological Systems (MUSELS), Universidad de Concepcion, Concepcion, Chile. Electronic address: cristian.duarte@unab.cl |
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0269-7491 |
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PMID:27589894 |
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LoNNe @ kyba @ |
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1516 |
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Datta, S.; Samanta, D.; Sinha, P.; Chakrabarti, N. |
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Title |
Gender features and estrous cycle variations of nocturnal behavior of mice after a single exposure to light at night |
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Journal Article |
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Year |
2016 |
Publication |
Physiology & Behavior |
Abbreviated Journal |
Physiol Behav |
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Volume |
164 |
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Pt A |
Pages |
113-122 |
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Keywords |
Animals |
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Light at night alters behavior and cognitive performances in rodents, the variations of which in gender and stages of reproductive cycle in females are elusive. Young mice habituated in light:dark (12:12h) cycle were given a single exposure of light (100lx) at early night for one hour duration followed by experimentations in open field (closed wall with circular big arena), elevated plus maze and square habituated field for memory performance using novel object recognition task. Light effects were compared with results found during without light conditions. Proestrous females appeared to have greater locomotor activity, less anxiety and better memory performance compared to the diestrous females at night without light exposure. The status of locomotor activity, anxiety and memory performance of male mice at night without light exposure appeared to be comparable to females where the stage of estrous cycle is important to characterize the nocturnal behavior of male mice. Light maximally affected proestrous females with decrease in locomotor activity, increase in anxiety and failure of memory performance. Male and diestrous female mice performed memory performance without alteration of locomotor activity and anxiety after exposure to light where males performed better memory performance with greater locomotor activity and more anxiety compared to that of diestrous females. The present study characterizes the mice nocturnal behavior with and without a single exposure to light stimuli with its gender features and estrous cycle variation. In addition, the study indicates an association of memory performance with locomotor activity and anxiety in mice nocturnal behavior. |
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Department of Physiology, University of Calcutta, Kolkata, West Bengal, India. Electronic address: ncphysiolcu@gmail.com |
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0031-9384 |
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PMID:27241632 |
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LoNNe @ kyba @ |
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1521 |
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Coleman, G.; Gigg, J.; Canal, M.M. |
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Postnatal light alters hypothalamic-pituitary-adrenal (HPA) axis function and induces a depressive-like phenotype in adult mice |
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Journal Article |
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2016 |
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The European Journal of Neuroscience |
Abbreviated Journal |
Eur J Neurosci |
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44 |
Issue |
10 |
Pages |
2807-2817 |
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Animals |
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The postnatal light environment that a mouse experiences during the critical first 3 postnatal weeks has long-term effects on both its circadian rhythm output and clock gene expression. Furthermore, data from our lab suggest that postnatal light may also impact the hypothalamic-pituitary-adrenal (HPA) axis, which is a key regulator of stress. To test the effect of postnatal light exposure on adult stress responses and circadian rhythmicity, we raised mice under either 24-h light-dark cycles (LD), constant light (LL) or constant dark (DD) during the first 3 postnatal weeks. After weaning we then exposed all animals to LD cycles (basal conditions), followed by LL (stressed conditions) environments. We examined brain neuropeptide and glucocorticoid receptor (GR) expression, plasma corticosterone concentration rhythm and body temperature rhythm, together with depression- and anxiety-related behaviour. Results showed that LL- and DD-raised mice exhibited decreased GR expression in the hippocampus, increased plasma corticosterone concentration at the onset of the dark phase and a depressive phenotype when exposed to LD cycles later in life. Furthermore, LL-raised mice showed increased corticotrophin-releasing hormone mRNA expression in the paraventricular nucleus of the hypothalamus. When exposed to LL as adults, LL-raised mice showed a significant circadian rhythm of plasma corticosterone concentration, together with a shorter period and stronger circadian rhythm of body temperature compared to DD-raised mice. Taken together, these data suggest that altered postnatal light environments have long-term effects on the HPA axis and the circadian system, which can lead to altered stress responses and a depressive phenotype in adulthood. This article is protected by copyright. All rights reserved. |
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Faculty of Life Sciences, University of Manchester, AV Hill Building, Oxford Road, M13 9PT, Manchester, UK. maria.canal@manchester.ac.uk |
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0953-816X |
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PMID:27591429 |
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LoNNe @ kyba @ |
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1523 |
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Kang, X.; Jia, L.; Zhang, X.; Li, Y.; Chen, Y.; Shen, X.; Wu, Y. |
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Title |
Long-Term Continuous Light Exposure Affects Body Weight and Blood Glucose Associated with Inflammation in Female Rats |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Biosciences and Medicines |
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Jbm |
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04 |
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09 |
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11-24 |
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2327-5081 |
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LoNNe @ kyba @ |
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1527 |
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Author |
Pacheco, Y.M.; Martin, G.J.; Bybee, S.M. |
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Title |
On the Phototactic Response of RwandanDiaphanesMotschulsky (Coleoptera: Lampyridae) to a Trap with a 630Nm Red Light |
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Journal Article |
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Year |
2016 |
Publication |
The Coleopterists Bulletin |
Abbreviated Journal |
The Coleopterists Bulletin |
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Volume |
70 |
Issue |
3 |
Pages |
559-561 |
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0010-065X |
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LoNNe @ kyba @ |
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1531 |
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