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Author Tuxbury, S.M.; Salmon, M.
Title Competitive interactions between artificial lighting and natural cues during seafinding by hatchling marine turtles Type Journal Article
Year 2005 Publication Biological Conservation Abbreviated Journal Biological Conservation
Volume 121 Issue 2 Pages 311-316
Keywords Sea turtle; Orientation; Photopollution; Habitat restoration; animals; reptiles; marine turtles; conservation
Abstract Artificial lighting disrupts the nocturnal orientation of sea turtle hatchlings as they crawl from their nest to the ocean. Laboratory experiments in an arena were used to simultaneously present artificial light (that attracted the turtles toward “land”) and natural cues (a dark silhouette of the dune behind the beach) that promoted “seaward” orientation. Artificial lighting disrupted seaward crawling in the presence of low silhouettes, but not high silhouettes. Low silhouettes provided adequate cues for seaward crawling when the apparent brightness of artificial light was reduced. Based upon these results, we postulate that artificial light disrupts orientation by competing with natural cues. Current restoration practices at nesting beaches emphasize light reduction. However at many sites some lights cannot be modified. Our results suggest that pairing dune restoration (to enhance natural cues) with light reduction (to the extent possible) should significantly improve hatchling orientation, even at nesting beaches where lighting cannot be entirely eliminated.
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Series Editor Series Title Abbreviated Series Title
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ISSN 0006-3207 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 79
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Author Vignoli, L.; Luiselli, L.
Title Better in the dark: two Mediterranean amphibians synchronize reproduction with moonlit nights Type Journal Article
Year 2013 Publication Web Ecology Abbreviated Journal Web Ecol.
Volume 13 Issue 1 Pages 1-11
Keywords animals; amphibians; Hyla intermedia; Rana dalmatina; *Reproduction; reproductive strategies; Moon; moon phase; moonlight
Abstract In Amphibians, both positive and negative correlations between activity and full moon phase have been observed. In this study, we present data for two anuran species (Hyla intermedia and Rana dalmatina) studied in a hilly Mediterranean area of central Italy. We analysed, in a two-year survey, the relationships between the number of egg clutches laid each night and the moon phases by means of circular statistics. Moreover, the studied species exhibited clear oviposition site selection behaviour influenced, at least in H. intermedia, by moon phases. We observed the occurrence of an avoidance effect by amphibians for oviposition and specific egg-laying behaviour during moon phases around the full moon. This apparent lunar phobia was evident in both species when yearly data were pooled. On the other hand, while this pattern continued to be also evident in H. intermedia when single years were considered, in R. dalmatina it stood just in one year of study. Nonetheless, during cloudy nights, when moonlight arriving on the ground was low, the frogs' behaviour was similar to that observed in new moon phases. We interpreted the observed pattern as an anti-predatory strategy. Overall, comparisons between our own study and previous research suggest that there was insufficient evidence to establish any unequivocal patterns and that further research in this regard is needed.
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Series Editor Series Title Abbreviated Series Title
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ISSN 1399-1183 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 80
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Author Grant, R.; Halliday, T.; Chadwick, E.
Title Amphibians' response to the lunar synodic cycle--a review of current knowledge, recommendations, and implications for conservation Type Journal Article
Year 2013 Publication Behavioral Ecology Abbreviated Journal Behavioral Ecology
Volume 24 Issue 1 Pages 53-62
Keywords amphibians; circular statistics; light; lunar cycle; moon phase; predator avoidance; reproductive synchronization; moonlight
Abstract The way in which amphibians respond to the geophysical changes brought about by the lunar synodic cycle is a neglected area of their ecology, but one which has recently generated interest. Knowledge of how amphibians respond to lunar phase is of intrinsic interest and also may be important for conservation and monitoring of populations. We surveyed the literature on amphibians’ responses to the lunar cycle and found 79 examples where moon phase in relation to amphibian behavior and ecology had been studied, across diverse amphibian taxa. Of the examples reviewed, most of them show some type of response to lunar phase, with only a few species being unaffected. We found that there is no significant difference between the numbers of species which increase, and those that decrease activity or reproductive behavior (including calling) during a full moon. The responses to the lunar cycle can not be generalized across taxonomic group, but instead are highly species specific and relate directly to the species’ ecology. The primary reasons for changes in amphibian behavior in response to the lunar cycle appear to be temporal synchronization of breeding and predator avoidance. Responses to changes in prey availability, facilitation of visual signalling and use of lunar cues in navigation and homing are less prevalent but merit further investigation. Comparisons between studies are hampered by differences in field and analytical methods; we therefore make a number of recommendations for future collection and analysis of data related to lunar phase.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1045-2249 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 81
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Author Rotics, S.; Dayan, T.; Kronfeld-Schor, N.
Title Effect of artificial night lighting on temporally partitioned spiny mice Type Journal Article
Year 2011 Publication Journal of Mammalogy Abbreviated Journal Journal of Mammalogy
Volume 92 Issue 1 Pages 159-168
Keywords mice; animals; mammals; Acomys cahirinus; Acomys russatus; activity patterns; light night niche; light pollution
Abstract We studied the effect of ecological light pollution on a rocky desert community, focusing on 2 spiny mouse congeners, nocturnal Acomys cahirinus (common spiny mouse) and diurnal Acomys russatus (golden spiny mouse). We hypothesized that in response to artificial illumination A. cahirinus will decrease its activity and A. russatus will increase its activity, and thus temporal overlap and interspecific competition could increase. Our study took place in 4 field enclosures: the 1st and 3rd months were controls with natural light, and in the 2nd month artificial illumination, simulating low levels of light pollution, was set for the first 3 h of the night. We implanted temperature-sensitive radiotransmitters to monitor mouse activity, and individual identification tags with automonitored foraging patches were used to track foraging behavior. A. cahirinus decreased activity and foraging with artificial lighting, restricting movement particularly in less-sheltered microhabitats, probably because of increased predation risk. Because illumination restricted both activity time and space, intraspecific encounters of A. cahirinus over foraging patches increased during and following the illuminated hours. However, diurnal A. russatus did not expand its activity into the illuminated hours, possibly due to the presence of competing A. cahirinus, or to nonfavorable environmental conditions. Therefore, overt interspecific competition was not affected by experimental light pollution. Light pollution had a negative influence by reducing overall activity and producing a relatively underexploited temporal niche, which may promote invasion of alien species that are less light sensitive; and by increasing intraspecific overlap in foraging A. cahirinus.
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0022-2372 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 86
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Author Topping, M.G.; Millar, J.S.; Goddard, J.A.
Title The effects of moonlight on nocturnal activity in bushy-tailed wood rats (Neotoma cinerea) Type Journal Article
Year 1999 Publication Canadian Journal of Zoology Abbreviated Journal Can. J. Zool.
Volume 77 Issue 3 Pages 480-485
Keywords animals; mammals; rats; bushy-tailed wood rat; Neotoma cinerea; Canada; foraging; reproduction; moonlight; predation risk
Abstract The nocturnal activity of bushy-tailed wood rats (Neotoma cinerea) was monitored for two breeding seasons (1993 and 1994) in the Canadian Rockies. Radiotelemetry was used under three levels of moonlight to assess two measures of nocturnal activity: (i) the proportion of animals crossing rocky outcrops and entering the surrounding forest to forage, search for mates, or both, and (ii) the distance moved from the den site while in the forest. Males and females exhibited significant differences among moonlight levels, with greater activity on nights of intermediate-level moonlight and less activity on nights with bright or dark moonlight. There was no difference in the proportions of males and females active at any moonlight level. The distances moved from the den did not differ among moonlight levels for either males or females. Having traversed the rocks and entered the forest, individuals moved similar distances regardless of light level. These results suggest that wood rats respond to moonlight only when making the decision to cross rocks and enter the forest. This behaviour presumably serves to counteract the increased risk of predation on bright nights.
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Language (up) Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0008-4301 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number IDA @ john @ Serial 88
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