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Author |
Franke, S.; Brüning, A.; Hölker, F.; Kloas, W. |
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Title |
Study of biological action of light on fish |
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Journal Article |
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2013 |
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Journal of Light & Visual Environment |
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37 |
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4 |
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LoNNe @ kagoburian @ |
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698 |
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Author |
Lyytimäki, J. |
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Title |
Avoiding overly bright future: The systems intelligence perspective on the management of light pollution |
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Journal Article |
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2015 |
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Environmental Development |
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Environmental Development |
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16 |
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4-14 |
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2211-4645 |
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LoNNe @ christopher.kyba @ |
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1200 |
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Author |
Lammerts, W.E. |
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The effect of continuous light, high nutrient level and temperature on flowering of camellia hybrids |
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1949 |
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American Camellia Yearbook |
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53-56 |
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GFZ @ kyba @ |
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2466 |
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Author |
Becker, D.J.; Singh, D.; Pan, Q.; Montoure, J.D.; Talbott, K.M.; Wanamaker, S.M.; Ketterson, E.D. |
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Title |
Artificial light at night amplifies seasonal relapse of haemosporidian parasites in a widespread songbird |
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Journal Article |
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Year |
2020 |
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Proceedings. Biological Sciences |
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Proc Biol Sci |
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287 |
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1935 |
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20201831 |
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*Animal Migration; Animals; Breeding; Parasitemia; Parasites; Recurrence; Seasons; Songbirds/*parasitology; *Junco hyemalis; *avian malaria; *ecoimmunology; *generalized additive models; *photoperiod; *urbanization |
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Urban habitats can shape interactions between hosts and parasites by altering not only exposure rates but also within-host processes. Artificial light at night (ALAN) is common in urban environments, and chronic exposure can impair host immunity in ways that may increase infection. However, studies of causal links between this stressor, immunity, and infection dynamics are rare, particularly in migratory animals. Here, we experimentally tested how ALAN affects cellular immunity and haemosporidian parasite intensity across the annual cycle of migrant and resident subspecies of the dark-eyed junco (Junco hyemalis). We monitored an experimental group exposed to light at night and a control group under natural light/dark cycles as they passed through short days simulating early spring to longer days simulating the breeding season, followed by autumn migration. Using generalized additive mixed models, we show that ALAN increased inflammation, and leucocyte counts were greatest in early spring and autumn. At the start of the experiment, few birds had active infections based on microscopy, but PCR revealed many birds had chronic infections. ALAN increased parasitaemia across the annual cycle, with strong peaks in spring and autumn that were largely absent in control birds. As birds were kept in indoor aviaries to prevent vector exposure, this increased parasitaemia indicates relapse of chronic infection during costly life-history stages (i.e. reproduction). Although the immunological and parasitological time series were in phase for control birds, cross-correlation analyses also revealed ALAN desynchronized leucocyte profiles and parasitaemia, which could suggest a general exaggerated inflammatory response. Our study shows how a common anthropogenic influence can shape within-host processes to affect infection dynamics. |
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Environmental Resilience Institute, Indiana University, Bloomington, IN, USA; danbeck ( at ) iu.edu |
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Royal Society |
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English |
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English |
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0962-8452 |
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PMID:32962545; PMCID:PMC7542808 |
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IDA @ john @ |
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3368 |
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Author |
Zheng, Q.; Weng, Q.; Wang, K. |
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Title |
Correcting the Pixel Blooming Effect (PiBE) of DMSP-OLS nighttime light imagery |
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2020 |
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Remote Sensing of Environment |
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Remote Sensing of Environment |
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240 |
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111707 |
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*instrumentation; Remote Sensing |
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In the last two decades, the advance in nighttime light (NTL) remote sensing has fueled a surge in extensive research towards mapping human footprints. Nevertheless, the full potential of NTL data is largely constrained by the blooming effect. In this study, we propose a new concept, the Pixel Blooming Effect (PiBE), to delineate the mutual influence of lights from a pixel and its neighbors, and an integrated framework to eliminate the PiBE in radiance calibrated DMSP-OLS datasets (DMSPgrc). First, lights from isolated gas flaring sources and a Gaussian model were used to model how the PiBE functions on each pixel through point spread function (PSF). Second, a two-stage deblurring approach (TSDA) was developed to deconvolve DMSPgrc images with Tikhonov regularization to correct the PiBE and reconstruct PiBE-free images. Third, the proposed framework was assessed by synthetic data and VIIRS imagery and by testing the resulting image with two applications. We found that high impervious surface fraction pixels (ISF > 0.6) were impacted by the highest absolute magnitude of PiBE, whereas NTL pattern of low ISF pixels (ISF < 0.2) was more sensitive to the PiBE. By using TSDA the PiBE in DMSPgrc images was effectively corrected which enhanced data variation and suppressed pseudo lights from non-built-up pixels in urban areas. The reconstructed image had the highest similarity to reference data from synthetic image (SSIM = 0.759) and VIIRS image (r = 0.79). TSDA showed an acceptable performance for linear objects (width > 1.5 km) and circular objects (radius > 0.5 km), and for NTL data with different noise levels (<0.6σ). In summary, the proposed framework offers a new opportunity to improve the quality of DMSP-OLS images and subsequently will be conducive to NTL-based applications, such as mapping urban extent, estimating socioeconomic variables, and exploring eco-impact of artificial lights. |
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0034-4257 |
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GFZ @ kyba @ |
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2940 |
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