scholarly journals Flying to the moon: Lunar cycle influences trip duration and nocturnal foraging behavior of the wedge-tailed shearwater Ardenna pacifica

2020 ◽  
Vol 525 ◽  
pp. 151322 ◽  
Author(s):  
Andreas Ravache ◽  
Karen Bourgeois ◽  
Martin Thibault ◽  
Sylvain Dromzée ◽  
Henri Weimerskirch ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Lunar Cycle ◽  
Trip Duration ◽  
The Moon ◽  
Nocturnal Foraging

Lunar Cycle Influences Reproductive Performance of Crossbred Brahman Cows Under Tropical Conditions

2021 ◽  
pp. 074873042098363
Author(s):  
Alejandro A. Aguirre ◽  
Roberto A. Palomares ◽  
Aitor D. De Ondiz ◽  
Eleazar R. Soto ◽  
Mariana S. Perea ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Full Moon ◽  
Lunar Cycle ◽  
The Moon ◽  
Crossbred Cows ◽  
Lunar Phases ◽  
Tropical Conditions ◽  
Service Conception ◽  
New Moon ◽  
Postpartum Estrus

Evidence has accumulated over the years indicating that the moon influences some aspects of the reproductive activity in animals and humans. However, little is known about the influence of the lunar cycle on the reproductive performance of cows under tropical conditions, where the environment strongly affects reproduction. This retrospective study was conducted with the aim of assessing the influence of the lunar cycle on some reproductive traits of tropical crossbred cows managed in a pasture-based system. Data from 5869 reproductive records from two commercial farms localized in the Maracaibo Lake Basin of Zulia State, Venezuela, were analyzed. Variables studied were first service conception rate, calving frequency, first postpartum estrous frequency, and pregnancy frequency. In addition to the lunar cycle, the effects of farm, season, and predominant breed were also considered. Data were analyzed using logistic regression and general linear model from SAS. First service conception was affected by lunar phases and predominant breed, but not by farm or season. For frequencies of calving, first postpartum estrus, and pregnancy, there was no main effect of farm, season, and predominant breed, whereas the effect of lunar phases was highly significant. First service conception was significantly greater in waning than in crescent phase of the lunar cycle. Frequencies of calving, first estrus, and pregnancy were highly correlated and showed greater figures around full moon and new moon. In conclusion, lunar cycle influenced first service conception, attaining greater values in the waning phase of the moon cycle. Frequencies of calving, first postpartum estrus, and pregnancy in crossbred cows showed a clear bimodal rhythm, whose greatest values coincided with new moon and full moon.

Partitioning of diving effort in foraging trips of northern gannets

2004 ◽  
Vol 82 (12) ◽  
pp. 1910-1916 ◽  
Author(s):  
Sue Lewis ◽  
Silvano Benvenuti ◽  
Francis Daunt ◽  
Sarah Wanless ◽  
Luigi Dall'Antonia ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Initial Rate ◽  
Trip Duration ◽  
Foraging Strategies ◽  
Foraging Activity ◽  
Trip Time

Many species of seabirds are known to undertake foraging trips that vary in duration, lasting from a few hours up to several days. However, the important question of how individuals allocate their time during foraging trips of different durations has received relatively little attention until recently. Using activity loggers, we examined the foraging behavior of chick-rearing northern gannets, Morus bassanus (L., 1758), during trips of different durations, and tested predictions concerning how foraging activity varies across trips. There was no evidence of a relationship between dive frequency during the first 3 h of a trip and trip duration, suggesting that the decision to continue on a longer trip was not affected by an adult's initial rate of encounter with prey. Flight constituted approximately 50% of total trip time, and the dive rate of birds per daylight hour was apparently unaffected by trip duration. Birds dived at similar rates on the outward and return sections of their foraging trips, which suggests that they may have been "topping up" on food on their return. Overall our results suggest that, unlike other pelagic seabirds, northern gannets at the Bass Rock do not adjust their individual foraging strategies among trips of different durations.

Lunar Cycle Influences Production of Tilapia (Oreochromis spp) Eggs in an Intensive Outdoor Production System in the Tropics

2022 ◽  
pp. 074873042110694
Author(s):  
Miguel F. Perea ◽  
Daniel A. Perdomo ◽  
Zenaida A. Corredor ◽  
Mario González ◽  
Hugo Hernandez-Fonseca ◽  
...  
Keyword(s):  
Production System ◽  
Full Moon ◽  
Farming Systems ◽  
Fish Farming ◽  
Reproductive Activity ◽  
Lunar Cycle ◽  
Natural Environments ◽  
The Moon ◽  
Commercial Fish ◽  
The Tropics

A robust body of evidence has demonstrated that the lunar cycle plays an important role in the reproduction of fish living in natural environments. However, little is known about the influence of the moon on tilapia reproductive activity in intensive fish farming systems. This study aims to evaluate the influence of the lunar cycle on the reproductive performance of tilapias in an intensive outdoor tropical production system in Latin America. Records of two tilapia strains (Nile tilapia [ Oreochromis niloticus; n = 75] and Red tilapia [ Oreochromis spp.; n = 1335]) reared in concrete tanks in a commercial fish farm were analyzed. Over a 3-year period, 60,136 captures were made in intervals of 12 to 14 days and 6,600 females were manually spawned. The number of females spawned and the volume of eggs collected from each tank ( n = 9) were recorded. Data was analyzed by the general linear model and means were compared by least squares means method. A very slight or no variation was observed when the lunar cycle was split into two halves (crescent and waning). The proportions of females spawned and the volume of eggs per spawned female and per female in the tank varied considerably across the eight periods of the lunar cycle, with greater values in the waning than in the crescent phase. A significantly greater proportion of tilapia spawned and yielded more eggs around the full moon than around the new moon and remaining days of the lunar cycle. The moon cycle affected the reproductive activity of tilapia, which were more reproductively active around the full moon and most of the waning phase.

Emigration of age-0 chinook salmon (Oncorhynchus tshawytscha) smolts from the upper South Umpqua River basin, Oregon, U.S.A.

1999 ◽  
Vol 56 (6) ◽  
pp. 939-946 ◽  
Author(s):  
Brett B Roper ◽  
Dennis L Scarnecchia
Keyword(s):  
River Basin ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Lunar Cycle ◽  
Stream Temperature ◽  
Spring Water ◽  
Day Length ◽  
The Moon ◽  
Moon Phases ◽  
Upper South

Two rotating smolt traps were used through 4 consecutive years to monitor emigrations of age-0 chinook salmon (Oncorhynchus tshawytscha) from two watersheds of the upper South Umpqua River basin, Oregon, U.S.A. The number of wild smolts moving past the mainstem South Umpqua River trap ranged from 26 455 in 1991 to less than 5000 in 1993. The number of wild smolts passing the Jackson Creek trap ranged from 13 345 in 1991 to 0 in 1993. Higher numbers of wild smolts were significantly (P = 0.003) correlated with higher numbers of prespawning adults counted in index reaches the preceding year. Timing of emigration of smolts was found to be significantly related to stream temperature (P < 0.05) and phase of the lunar cycle (P < 0.05) but not related to changes in discharge (P > 0.05). Median emigration dates, which varied over 9 weeks, were earlier when spring water temperatures were higher. On average, two thirds of yearly smolt runs occurred when the moon was either waning or new, even though these moon phases were present only about half of the time. Significantly (P < 0.05) more fish than expected emigrated past both traps when day length was increasing.

scholarly journals The orthodox liturgical year and its theological structure

2021 ◽  
Vol 77 (4) ◽  
Author(s):  
Dan A. Streza
Keyword(s):  
Human Life ◽  
Discrete Systems ◽  
Lunar Cycle ◽  
Special Importance ◽  
The Sun ◽  
The Moon ◽  
Liturgical Year ◽  
Lunar Cycles ◽  
Real Presence ◽  
The Church

The concept of ‘liturgical year’ indicates a reference to the meaning of the measuring units of civil time, and especially to the cosmic entities that determine the general rhythm of time – the sun and the moon. Interestingly, the liturgical time depends both on the structure of civil time, and, on the two discrete systems of the solar and lunar cycles, which have always been underpinnings of time measuring. The special importance and influence that the cosmical rhythms exert on the entire human life are also felt in the structure and theology of the liturgical time, where it signals the attempt to merge and reconcile the cosmical solar and lunar cycles within the liturgical year. This leads to a unique theology, expressing the powerful synthesis of the variability of the lunar cycle compared to the structure of the solar year’s fixed dates.Contribution: This research reveals the unique orthodox perspective on both civil and liturgical time, expressing their profound theological meaning, as a conscious, permanent reflection upon the mysterious, yet real, presence of Christ in the divine services of the Church.

scholarly journals Provisioning Rate and Attendance Patterns of Wandering Albatrosses at Bird Island, South Georgia

The Condor ◽  
2001 ◽  
Vol 103 (2) ◽  
pp. 230-239 ◽  
Author(s):  
Simon D. Berrow ◽  
John P. Croxall
Keyword(s):  
Foraging Behavior ◽  
Body Mass ◽  
Work Rate ◽  
Meal Size ◽  
Trip Duration ◽  
Foraging Patterns ◽  
South Georgia ◽  
Diomedea Exulans ◽  
Attendance Patterns ◽  
Provisioning Rate

Abstract We investigated foraging behavior of Wandering Albatrosses (Diomedea exulans) breeding at South Georgia to assess how sex and season-specific foraging patterns relate to provisioning performance. We estimated Wandering Albatross chicks require 60–65 kg of food over the chick-rearing period; males deliver 54% of this total. Meal size delivered by both sexes remained essentially constant throughout the post-brooding chick-rearing period, but foraging trip duration varied considerably. Females made consistently longer foraging trips and delivered smaller meals but transported an average load that was 20% heavier in proportion to their body mass than males. We suggest that chick-rearing places greater demands on females compared with males and Wandering Albatrosses work hard to deliver food during the first half of chick rearing (at the expense of their own condition), thereafter reduce their work rate, presumably so as not to compromise their survival.

scholarly journals Composition, density and biomass of fish community from the surf zone as a function of the lunar cycle at Miramar Beach in Cabedelo, Paraíba

2019 ◽  
Vol 17 (2) ◽  
Author(s):  
Willy Vila Nova Pessoa ◽  
Jonas de Assis Almeida Ramos ◽  
Paulo Guilherme Vasconcelos de Oliveira
Keyword(s):  
Surf Zone ◽  
Abundant Species ◽  
Lunar Cycle ◽  
Species Group ◽  
Biological Interactions ◽  
The Moon ◽  
Group I ◽  
The Mean ◽  
New Moon ◽  
Density And Biomass

ABSTRACT The influence of the moon cycles on the ichthyofauna has been little studied in the surf zone. In this study, the number of species, density and biomass were evaluated as a function of the moon. A total of 49 species distributed in 24 families were captured in two areas of Miramar beach. The mean density was significant high in the weaning and low in the new moon, while density and biomass together showed differences for areas. The most abundant species were Anchoa tricolor and Trachinotus falcatus (new moon), and Anchovia clupeoides showed significant differences in the waning moon. The RDA indicates that turbidity influenced significantly the presence of two species group. The group I were represented by Stellifer brasiliensis, Trachinotus goodei, A. clupeoides, Chilomycterus spinosus and Conodon nobilis that occurred on the waning and new phases in both areas, while the group II were represented by Polydactylus virginicus and Haemulopsis corvinaeformis in the full moon. The surf zones may also be strongly governed by the lunar phases. Therefore, the results found in this study, showed that the biological interactions between the species with turbidity and moon might explain the density and biomass variations for some species in the surf zone.

The Lunar Cycle Influences Time of Roost Departure in The Common Blossom Bat, Syconycteris australis.

1998 ◽  
Vol 20 (1) ◽  
pp. 21
Author(s):  
B.S. Law
Keyword(s):  
Full Moon ◽  
Behavioural Change ◽  
Lunar Cycle ◽  
Dark Phase ◽  
The Moon ◽  
The Common

Observations of radio-tagged Common Blossom Bats Syconycteris australis on the Atherton Tablelands, Queensland indicate that the time of departure from roost areas is related to the lunar cycle. During the dark phase of the moon, bats leave their roost between 5-20 mins after dark. Departure times are delayed up to 4 hrs between the period of the first quarter and full moon when the moon is bright after dusk. The predatory role of owls at night is suggested as the probable cause of this behavioural change.

scholarly journals On certain variations of the mean height of the barometer, mean temperature and depth of rain, connected with the lunar phases, in the cycle of years from 1815 to 1823

1843 ◽  
Vol 4 ◽  
pp. 211-211
Keyword(s):  
Full Moon ◽  
Lunar Cycle ◽  
Lunar Phase ◽  
The Moon ◽  
Lunar Phases ◽  
Mean Temperature ◽  
The Mean ◽  
New Moon ◽  
Made In

The table given in this paper contains the results of calculations relating to the objects specified in the title; cast into periods of six, seven, or eight days, so as to bring the day of the lunar phase belonging to it in the middle of the time. The observations were all made in the neighbourhood of London. It appears from them that in the period of the last quarter of the moon the barometer is highest, the temperature a little above the mean, and the depth of rain the smallest. In the period of the new moon, both the barometer and temperature are considerably depressed, and the rain increased in quantity. The influence of the first quarter shows itself by the further depression of the barometer; but the temperature rises almost to the point from which it had fallen, and the rain still increases, but not in an equal ratio. Lastly, the full moon again reduces the temperature; while the barometer attains its maximum mean height, and the quantity of rain is the greatest. Thus it appears, that during this lunar cycle, the approach of the last quarter is the signal for the clearing up of the air, and the return of sunshine.

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