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Author |
Czarnecka, M.; Kakareko, T.; Jermacz, Ł.; Pawlak, R.; Kobak, J. |
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Title |
Combined effects of nocturnal exposure to artificial light and habitat complexity on fish foraging |
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Journal Article |
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Year |
2019 |
Publication |
Science of The Total Environment |
Abbreviated Journal |
Science of The Total Environment |
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Volume  |
684 |
Issue |
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Pages |
14-22 |
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Keywords |
Animal; fishes; Perca fluviatilis; Gammarus fossarum; gammarids; aquatic ecosystems |
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Abstract |
Due to the widespread use of artificial light, freshwater ecosystems in urban areas at night are often subjected to light of intensities exceeding that of the moonlight. Nocturnal dim light could modify fish behaviour and benefit visual predators because of enhanced foraging success compared to dark nights. However, effects of nocturnal light could be mitigated by the presence of structured habitats providing refuges for prey. We tested in laboratory experiments whether nocturnal light of low intensity (2 lx) increases foraging efficiency of the Eurasian perch (Perca fluviatilis) on invertebrate prey (Gammarus fossarum). The tests were conducted at dusk and night under two light regimes: natural cycle with dark nights and disturbed cycle with artificially illuminated nights, in habitats differing in structural complexity: sand and woody debris. We found that nocturnal illumination significantly enhanced the consumption of gammarids by fish compared to dark nights. In addition, the perch was as effective predator in illuminated nights (2 lx) as at dusk (10 lx). Woody debris provided an effective refuge only in combination with undisturbed darkness, but not in illuminated nights. Our results suggest that nocturnal illumination in aquatic ecosystems may contribute to significant reductions in invertebrate population sizes through fish predation. The loss of darkness reduces the possibility of using shelters by invertebrates and hence the effects of elevated light levels at night could not be mitigated by an increased habitat complexity. |
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Department of Ecology and Biogeography, Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, Toruń, Poland; mczarn(at)umk.pl |
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Elsevier |
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English |
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English |
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ISSN |
0048-9697 |
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no |
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Call Number |
GFZ @ kyba @ |
Serial |
2507 |
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Author |
Filipski, E.; Subramanian, P.; Carriere, J.; Guettier, C.; Barbason, H.; Levi, F. |
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Title |
Circadian disruption accelerates liver carcinogenesis in mice |
Type |
Journal Article |
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Year |
2009 |
Publication |
Mutation Research |
Abbreviated Journal |
Mutat Res |
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Volume |
680 |
Issue |
1-2 |
Pages |
95-105 |
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Keywords |
Human Health; Animals; Alanine Transaminase/blood; Animals; Aspartate Aminotransferases/blood; Bile Duct Neoplasms/chemically induced/pathology; Bile Ducts, Intrahepatic/drug effects/pathology; Body Weight/drug effects; Carcinogens/administration & dosage/*toxicity; Carcinoma, Hepatocellular/chemically induced/pathology; Cholangiocarcinoma/chemically induced/pathology; Circadian Rhythm/*drug effects; Diethylnitrosamine/administration & dosage/*toxicity; Dose-Response Relationship, Drug; Injections, Intraperitoneal; Liver/drug effects/pathology; Liver Neoplasms/blood/*chemically induced/pathology; Male; Mice; Neoplasms, Multiple Primary/chemically induced/pathology; Sarcoma/chemically induced/pathology; Time Factors |
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Abstract |
BACKGROUND: The circadian timing system rhythmically controls behavior, physiology, cellular proliferation and xenobiotic metabolism over the 24-h period. The suprachiasmatic nuclei in the hypothalamus coordinate the molecular clocks in most mammalian cells through an array of circadian physiological rhythms including rest-activity, body temperature, feeding patterns and hormonal secretions. As a result, shift work that involves circadian disruption is probably carcinogenic in humans. In experimental models, chronic jet-lag (CJL) suppresses rest-activity and body temperature rhythms and accelerates growth of two transplantable tumors in mice. CJL also suppresses or significantly alters the expression rhythms of clock genes in liver and tumors. Circadian clock disruption from CJL downregulates p53 and upregulates c-Myc, thus favoring cellular proliferation. Here, we investigate the role of CJL as a tumor promoter in mice exposed to the hepatic carcinogen, diethylnitrosamine (DEN). METHODS: In experiment 1 (Exp 1), the dose-dependent carcinogenicity of chronic intraperitoneal (i.p.) administration of DEN was explored in mice. In Exp 2, mice received DEN at 10 mg/kg/day (cumulative dose: 243 mg/kg), then were randomized to remain in a photoperiodic regimen where 12 h of light alternates with 12 h of darkness (LD 12:12) or to be submitted to CJL (8-h advance of light onset every 2 days). Rest-activity and body temperature were monitored. Serum liver enzymes were determined repeatedly. Mice were sacrificed and examined for neoplastic lesions at 10 months. RESULTS: In Exp 1, DEN produced liver cancers in all the mice receiving 10 mg/kg/day. In Exp 2, mice on CJL had increased mean plasma levels of aspartate aminotransferase and more liver tumors as compared to LD mice at approximately 10 months (p = 0.005 and 0.028, respectively). The mean diameter of the largest liver tumor was twice as large in CJL vs LD mice (8.5 vs 4.4 mm, p = 0.027). In LD, a single histologic tumor type per liver was observed. In CJL, up to four different types were associated in the same liver (hepatocellular- or cholangio-carcinomas, sarcomas or mixed tumors). DEN itself markedly disrupted the circadian rhythms in rest-activity and body temperature in all the mice. DEN-induced disruption was prolonged for >or= 3 months by CJL exposure. CONCLUSIONS: The association of circadian disruption with chronic DEN exposure suggests that circadian clocks actively control the mechanisms of liver carcinogenesis in mice. Persistent circadian coordination may further be critical for slowing down and/or reverting cancer development after carcinogen exposure. |
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INSERM, U776 Rythmes Biologiques et Cancers, Hopital Paul Brousse, Villejuif F-94807, France |
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English |
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0027-5107 |
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PMID:19833225 |
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no |
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Call Number |
LoNNe @ kagoburian @ |
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747 |
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Author |
Oesch-Bartlomowicz, B.; Weiss, C.; Dietrich, C.; Oesch, F. |
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Title |
Circadian rhythms and chemical carcinogenesis: Potential link. An overview |
Type |
Journal Article |
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Year |
2009 |
Publication |
Mutation Research |
Abbreviated Journal |
Mutat Res |
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Volume |
680 |
Issue |
1-2 |
Pages |
83-86 |
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Keywords |
Human Health; Animals; Carcinogens/*toxicity; Cell Cycle/physiology; Cell Cycle Proteins/physiology; Circadian Rhythm/*drug effects/physiology; DNA/drug effects; DNA Damage; DNA Repair; Homeostasis/physiology; Humans; Neoplasms/*etiology/physiopathology; Period Circadian Proteins/metabolism |
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Circadian rhythm is an integral and not replaceable part of the organism's homeostasis. Its signalling is multidimensional, overlooking global networks such as chromatin remodelling, cell cycle, DNA damage and repair as well as nuclear receptors function. Understanding its global networking will allow us to follow up not only organism dysfunction and pathology (including chemical carcinogenesis) but well-being in general having in mind that time is not always on our side. |
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ECNIS Unit, University of Mainz, D-55131 Mainz, Germany. oeschb@uni-mainz.de |
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0027-5107 |
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Notes |
PMID:19836463 |
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LoNNe @ kagoburian @ |
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790 |
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Author |
Stevens, R.G. |
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Title |
Working against our endogenous circadian clock: Breast cancer and electric lighting in the modern world |
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Journal Article |
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Year |
2009 |
Publication |
Mutation Research/Genetic Toxicology and Environmental Mutagenesis |
Abbreviated Journal |
Mutation Research/Genetic Toxicology and Environmental Mutagenesis |
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Volume |
680 |
Issue |
1-2 |
Pages |
106-108 |
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Keywords |
Human Health |
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1383-5718 |
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LoNNe @ kagoburian @ |
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819 |
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Author |
Wang, L.; Liu, X.; Liu, Z.; Wang, X.; Lei, C.; Zhu, F. |
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Title |
Members of the neuropeptide transcriptional network in Helicoverpa armigera and their expression in response to light stress |
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Journal Article |
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Year |
2018 |
Publication |
Gene |
Abbreviated Journal |
Gene |
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Volume |
671 |
Issue |
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Pages |
67-77 |
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Keywords |
Animals |
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Abstract |
Neuropeptides and peptide hormones play central roles in the regulation of various types of insect physiology and behavior. Artificial light at night, a form of environmental stress, has recently been regarded as a source of light stress on nocturnal insects. Because related genomic information is not available, molecular biological studies on the response of neuropeptides in nocturnal insects to light stress are limited. Based on the de novo sequencing of the Helicoverpa armigera head transcriptome, we obtained 124,960 unigenes. Of these, the number of unigenes annotated as neuropeptides and peptide hormones, neurotransmitter precursor processing enzymes, and neurotransmitter receptors were 34, 17, and 58, respectively. Under light stress, there were sex-specific differences in gene expression measured by qRT-PCR. The IMFamide, leucokinin and sNPF genes were differentially expressed at the mRNA level in males but not in females in response to light stress. The results provide new insights on the diversity of the neuropeptide transcriptional network of H. armigera. In addition, some neuropeptides exhibited sex-specific differential expression in response to light stress. Taken collectively, these results not only expand the catalog of known insect neuropeptides but also provide a framework for future functional studies on the physiological roles they play in the light stress response behavior of nocturnal moths. |
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0378-1119 |
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Call Number |
GFZ @ kyba @ |
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1910 |
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