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Author |
Woods, C.P.; Brigham, R.M. |
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Title |
Common Poorwill activity and calling behavior in relation to moonlight and predation |
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Journal Article |
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Year |
2008 |
Publication |
The Wilson Journal of Ornithology |
Abbreviated Journal |
The Wilson Journal of Ornithology |
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Volume |
120 |
Issue |
3 |
Pages |
505-512 |
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Keywords |
birds; poorwills; Common Poorwill; Phalaenoptilus nuttallii; Arizona; moonlight |
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Abstract |
We investigated the influence of lunar and environmental factors on behavior of Common Poorwills (Phalaenoptilus nuttallii) in southern Arizona under a diverse set of natural and artificial conditions. Radio-marked poorwills were most active shortly after sunset during the new moon. Movements declined as evening progressed. Activity remained high for several hours after sunset when the moon was full. Poorwills were heard calling from March through October, but most calling occurred between early May and September. Only ambient light was correlated with number of poorwills heard calling. More poorwills responded to playbacks of conspecifics when the moon was full than when it was new. Poorwills did not change their response to conspecifics during full moon when playback of poorwill calls followed playback of Great Horned Owl (Bubo virginianus) calls but, during the new moon, fewer birds responded following the owl call. Poorwill behavior is strongly influenced by lunar conditions; their ability to detect and evade predators is important when calling advertises their location. |
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1559-4491 |
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IDA @ john @ |
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62 |
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Shimose, T.; Yokawa, K.; Tachihara, K. |
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Title |
Higher Catch Rates Around the Full Moon for Blue Marlin, Makaira Nigricans, in a Diurnal Trolling Fishery |
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Journal Article |
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Year |
2013 |
Publication |
Bulletin of Marine Science |
Abbreviated Journal |
Bms |
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Volume |
89 |
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3 |
Pages |
759-765 |
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Keywords |
fish; blue marlin; Makaira nigricans; Moon; moonlight; Feeding Behavior |
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Abstract |
The relationship between lunar phase and catch rates of blue marlin, Makaira nigricans Lacépède, 1802, in a diurnal trolling fishery at Yonaguni Island, southwestern Japan, was investigated. The mean catch per unit effort of blue marlin to lunar day was expressed by a periodic regression and significantly increased around the full moon. The stomach content index also significantly increased around the full moon in small blue marlin (<200 cm lower jaw–fork length), indicating that diurnal feeding activities of blue marlin increased around the full moon, especially for smaller individuals. The diurnal feeding activity is thought to be influenced by the nighttime activities of blue marlin and/or prey movements. |
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0007-4977 |
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IDA @ john @ |
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63 |
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Becker, A.; Whitfield, A.K.; Cowley, P.D.; Järnegren, J.; Naesje, T.F.; Crispo, E. |
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Title |
Potential effects of artificial light associated with anthropogenic infrastructure on the abundance and foraging behaviour of estuary-associated fishes |
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Journal Article |
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2013 |
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Journal of Applied Ecology |
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J Appl Ecol |
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50 |
Issue |
1 |
Pages |
43-50 |
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Keywords |
fish; biology; ecology |
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As a consequence of a positive phototaxic response, the findings of this study suggest that artificial light often associated with man-made structures has the potential to alter fish communities within urban estuarine ecosystems by creating optimal conditions for predators. Future coastal developments should consider the ecological implications of lighting on aquatic communities. We recommend that lighting be minimized around coastal infrastructure and the use of red lights, which have limited penetration though water, be considered. |
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0021-8901 |
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IDA @ john @ |
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64 |
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Bos, A.R.; Gumanao, G.S. |
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Title |
The lunar cycle determines availability of coral-reef fishes at fish markets |
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Journal Article |
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2012 |
Publication |
Journal of Fish Biology |
Abbreviated Journal |
J Fish Biol |
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81 |
Issue |
6 |
Pages |
2074-2079 |
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Keywords |
Animals; Commerce; Coral Reefs; *Fishes; *Moon; Philippines; Seafood/*statistics & numerical data |
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During 139 visits between March 2009 and May 2011, it was found that the availability of reef fishes at a local fish market in the Philippines was highly affected by the lunar cycle. The number of vendors selling reef fishes was significantly lower (13.4%) during third lunar quarters (full moon periods) than during the first, second and fourth lunar quarters (40.2, 25.0 and 30.0%, respectively). It is recommended that the influence of the lunar cycle on fish availability is considered when designing sampling strategies for catch surveys. |
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Netherlands Centre for Biodiversity Naturalis, RA Leiden, The Netherlands. arthurrbos@yahoo.com |
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English |
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0022-1112 |
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PMID:23130702 |
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IDA @ john @ |
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65 |
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Mehner, T. |
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Title |
Diel vertical migration of freshwater fishes – proximate triggers, ultimate causes and research perspectives: Diel vertical migration in freshwater fishes |
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2012 |
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Freshwater Biology |
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57 |
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7 |
Pages |
1342-1359 |
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Keywords |
diel vertical migration; *Fishes; freshwater fish |
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1. Diel vertical migrations (DVM) are typical for many cold-water fish species such as Pacific salmons (Oncorhynchus spp.) and coregonids (Coregonus spp.) inhabiting deep lakes. A comprehensive recent overview of DVM in freshwater fish has not been available, however.
2. The main proximate trigger of DVM in freshwater fish is the diel change in light intensity, with declining illumination at dusk triggering the ascent and the increase at dawn triggering the descent. Additional proximate cues are hydrostatic pressure and water temperature, which may guide fish into particular water layers at night.
3. Ultimate causes of DVM encompass bioenergetics efficiency, feeding opportunities and predator avoidance. None of these factors alone can explain the DVM in all cases. Multi-factorial hypotheses, such as the ‘antipredation window’ combined with the thermal niche hypothesis, are more likely to explain DVM. It is suggested that planktivorous fish move within a layer sufficiently well illuminated to capture zooplankton, but too dark for predators to feed upon the migrating fish. In complete darkness, fish seek layers with a temperature that optimises bioenergetics efficiency. The strength of each factor may differ from lake to lake, and hence system-specific individual analyses are needed.
4. Mechanistic details that are still poorly explored are the costs of buoyancy regulation and migration, the critical light thresholds for feeding of planktivorous and piscivorous fish, and predator assessment by (and size-dependent predation risk of) the prey fish.
5. A comprehensive understanding of the adaptive value of DVM can be attained only if the behaviour of individual fish within migrating populations is explicitly taken into account. Size, condition and reproductive value differ between individuals, suggesting that migrating populations should split into migrants and non-migrants for whom the balance between mortality risk and growth rate can differ. There is increasing evidence for this type of partial DVM within populations.
6. Whereas patterns of DVM are well documented, the evolution of DVM is still only poorly understood. Because experimental approaches at realistic natural scales remain difficult, a combination of comprehensive data sets with modelling is likely to resolve the relative importance of different proximate and ultimate causes behind DVM in fish. |
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0046-5070 |
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IDA @ john @ |
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66 |
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