scholarly journals Spatial and temporal patterns of habitat use by three estuarine species of mysid shrimp

2008 ◽  
Vol 59 (9) ◽  
pp. 792 ◽  
Author(s):  
Matthew D. Taylor
Keyword(s):  
Habitat Use ◽  
Full Moon ◽  
Foraging Strategies ◽  
Habitat Partitioning ◽  
Spatial And Temporal Patterns ◽  
Benthic Habitats ◽  
Trophic Resources ◽  
New Moon ◽  
Adaptive Foraging ◽  
Mysid Shrimp

The mysids Rhopalopthalmus egregius, Haplostylus dakini and Doxomysis australiensis are abundant yet unstudied omnivorous crustaceans in Australian estuaries. Habitat use and population dynamics were investigated for these species over spring and summer in the Tweed River, Australia, to explore their ecological role in estuarine ecosystems. Overall, mysids were concentrated in shallow unvegetated and deep unvegetated estuarine habitats. H. dakini were most abundant in shallow and deep bare habitats at night, whereas R. egregius were most abundant in deep bare habitats during the night. D. australiensis were present across all habitats in the night, but negligible numbers were present during the day. Significantly greater numbers of R. egregius and D. australiensis were sampled during the new moon, compared with the full moon. Significantly larger R. egregius and D. australiensis individuals were present in benthic habitats at night, indicating possible partitioning of habitat for juvenile and adult subpopulations. Adaptive foraging strategies and habitat use facilitates the coexistence of sympatric mysid species, H. dakini and R. egregius, and within-species habitat partitioning allowed juvenile R. egregius to avoid interaction with adult R. egregius. The observed dynamics minimize inter- and intra-specific predation between mysids, and by other predators, while optimizing access to key trophic resources.

Ontogenetic depth partitioning by juvenile freshwater sawfish (Pristis microdon: Pristidae) in a riverine environment

2009 ◽  
Vol 60 (4) ◽  
pp. 306 ◽  
Author(s):  
Jeff M. Whitty ◽  
David L. Morgan ◽  
Stirling C. Peverell ◽  
Dean C. Thorburn ◽  
Stephen J. Beatty
Keyword(s):  
Full Moon ◽  
Management Strategies ◽  
Habitat Partitioning ◽  
Lunar Phase ◽  
Depth Range ◽  
Ontogenetic Changes ◽  
Light Regimes ◽  
Riverine Environment ◽  
New Moon ◽  
Fitzroy River

The freshwater sawfish (Pristis microdon) is a critically endangered elasmobranch. Ontogenetic changes in the habitat use of juvenile P. microdon were studied using acoustic tracking in the Fitzroy River, Western Australia. Habitat partitioning was significant between 0+ (2007 year class) and larger 1+ (2006 year class) P. microdon. Smaller 0+ fish generally occupied shallower water (<0.6 m) compared with 1+ individuals, which mainly occurred in depths >0.6 m. Significant differences in hourly depth use were also revealed. The depth that 1+ P. microdon occupied was significantly influenced by lunar phase with these animals utilising a shallower and narrower depth range during the full moon compared with the new moon. This was not observed in 0+ individuals. Habitat partitioning was likely to be related to predator avoidance, foraging behaviours, and temperature and/or light regimes. The occurrence of 1+ P. microdon in deeper water may also result from a need for greater depths in which to manoeuvre. The present study demonstrates the utility of acoustic telemetry in monitoring P. microdon in a riverine environment. These results demonstrate the need to consider the habitat requirements of different P. microdon cohorts in the strategic planning of natural resources and will aid in the development of management strategies for this species.

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.

Habitat use by stream-breeding frogs in south-east Sulawesi, with some preliminary observations on community organization

2004 ◽  
Vol 20 (4) ◽  
pp. 439-448 ◽  
Author(s):  
Graeme R. Gillespie ◽  
David Lockie ◽  
Michael P. Scroggie ◽  
Djoko T. Iskandar
Keyword(s):  
Species Richness ◽  
Habitat Use ◽  
Community Organization ◽  
Habitat Associations ◽  
Habitat Partitioning ◽  
Tropical Stream ◽  
Frog Species ◽  
Oviposition Sites ◽  
Selection Of ◽  
Spatial Habitat

The habitat associations of stream-breeding frogs were examined along a series of stream transects on Buton Island in south-east Sulawesi, Indonesia. Of the eight frog species located along streams, four were observed breeding in stream habitats. We examined spatial habitat partitioning among these species. Three of the four species were found to be associated with a non-random selection of the available perch sites. Strong partitioning between species in habitat associations was found; partitioning of the available habitat space was primarily associated with differences in proximity to stream features, and in the height of perch sites. General observations indicated that oviposition sites of most species were associated with the microhabitats in which the adult frogs were found. All four stream-breeding species appear to have synchronous breeding phenologies and the spatial relationships of these species within the habitat space appear to reflect partitioning of calling sites and oviposition sites. The stream-breeding frog community in this region of Sulawesi has much lower species richness and less specialized habitat use compared with other tropical stream-breeding frog communities in the region.

scholarly journals PENGARUH FASE BULAN TERHADAP WAKTU TEBAR PANCING DAN LAJU TANGKAP MADIDIHANG (Thunnus albacares Bonnaterre, 1788) PADA ARMADA RAWAI TUNA

2017 ◽  
Vol 22 (4) ◽  
pp. 207
Author(s):  
Irwan Jatmiko ◽  
Bram Setyadji ◽  
Arief Wujdi
Keyword(s):  
Full Moon ◽  
Yellowfin Tuna ◽  
Catch Rate ◽  
Lunar Phase ◽  
Anova Analysis ◽  
Tukey Test ◽  
Significant Difference ◽  
New Moon ◽  
One Way Anova ◽  
Tuna Longline

Madidihang/yellowfin tuna merupakan salah satu jenis ikan tuna ekonomis penting bagi industri perikanan di Indonesia dengan kontribusi hasil tangkapan yang terbanyak. Penelitian ini bertujuan untuk mengetahui pengaruh fase bulan terhadap waktu mulai tebar pancing dan laju tangkap madidihang pada armada rawai tuna. Pengumpulan data dilakukan oleh pemantau ilmiah pada armada rawai tuna yang sebagian besar berbasis di Pelabuhan Benoa, Bali mulai Agustus 2005 hingga Juni 2014. Daerah penangkapan ikan dari armada rawai tuna yang diambil datanya berada di lokasi (lintang dan bujur) 9°-16° LS hingga 109°-120° BT. Analisis anova satu arah dan tes Tukey dilakukan untuk mengetahui pengaruh fase bulan terhadap waktu mulai tebar pancing dan laju tangkap madidihang. Total sebanyak 60 trip dan 1.467 hari operasi penangkapan armada rawai tuna dilakukan dalam penelitian ini. Analisis statistik anova satu arah menunjukkan bahwa terdapat pengaruh yang nyata pada fase bulan terhadap waktu mulai tebar pancing (p<0,05). Selanjutnya, tes Tukey menunjukkan bahwa waktu mulai tebar pancing pada saat bulan purnama dimulai pada pukul 9:00 pagi hari. Waktu ini lebih lambat sekitar 2 jam dari pada waktu mulai tebar pancing pada ketiga fase bulan lainnya (perbani awal, perbani akhir dan bulan baru) yang dilakukan sekitar pukul 7:00 pagi hari. Analisis statistik anova satu arah juga menunjukkan terdapat perbedaan yang nyata antar fase bulan terhadap laju tangkap madidihang (p<0,05). Selanjutnya, tes Tukey menunjukkan bahwa laju tangkap pada saat bulan baru dan perbani awal sebesar 0,13 ekor/100 mata pancing atau lebih besar dibandingkan nilai laju tangkap pada saat purnama dan perbani akhir yang hanya sebesar 0,09 ekor/100 mata pancing. Yellowfin tuna is one of the most economically important species for fisheries industry in Indonesia. The objectives of this study are to investigate the effect of lunar phase to the set time start and catch rate of yellowfin tuna on tuna longline vessels. Data collected by scientific observer on tuna longline vessels mainly based in Benoa Port, Bali from August 2005 to June 2014. Fishing ground of sampled longline tuna located from 9°-16° S to 109°-120° E. One-way anova analysis and Tukey test conducted to examine the effect of lunar phase to the set time start and catch rate of yellowfin tuna. A total of 60 trips and 1,467 fishing days of longline tuna fishing vessels operation have been sampled for in this study. One-way anova analysis showed that there was a significant difference of lunar phase to the set time start (p<0.05). Furthermore, Tukey test showed that the starting time for setting during the full moon begins at 9:00 am. Its time was around 2 hours slower than the start of setting of the other three moon phase (first quarter, last quarter and new moon) which start around 7:00 am. One-way anova analysis also showed that there was a significant difference of lunar phase to catch rate of yellowfin tuna (p<0.05). Furthermore, Tukey test confirmed that hook rate on new moon and first quarter was 0.13/100 hooks or 0.4 bigger than hook rate on full moon and last quarter with only 0.09/100 hooks.

scholarly journals PEMIJAHAN INDUK, PROFIL KOLESTEROL, DAN ASAM LEMAK TELUR LOBSTER PASIR (Panulirus homarus) HASIL BUDIDAYA

2018 ◽  
Vol 13 (3) ◽  
pp. 219
Author(s):  
Yudha Trinoegraha Adiputra ◽  
Muhammad Zairin Jr. ◽  
Muhammad Agus Suprayudi ◽  
Wasmen Manalu ◽  
Widanarni Widanarni
Keyword(s):  
Fatty Acids ◽  
Full Moon ◽  
Spiny Lobster ◽  
Eyestalk Ablation ◽  
Early Indicator ◽  
Mass Spawning ◽  
New Moon ◽  
Low Incidence

Pembenihan lobster pasir (Panulirus homarus) belum berkembang di Indonesia karena terbatasnya teknik pemijahan induk dan belum diketahuinya tingkat keberhasilan induk betina membawa telur dan profil telur hasil pemeliharaan. Penelitian bertujuan untuk mempelajari pengaruh ablasi satu tangkai mata, metode pemijahan massal dan individual pada bulan gelap dan terang pada induk berganti kulit dan membawa telur, serta konsentrasi kolesterol dan asam-asam lemak telur pada lama pengeraman berbeda. Induk betina dan jantan dipakai secara terus-menerus saat percobaan pemijahan. Pemijahan pertama menggunakan pemijahan dengan rasio 2:1 pada bulan gelap. Percobaan kedua dan ketiga menggunakan pemijahan massal selama bulan terang dan gelap. Profil telur dibandingkan konsentrasi kolesterol dan asam lemaknya pada 1, 2, dan 3-4 minggu pengeraman. Hasil penelitian menunjukkan ablasi tangkai mata dapat menstimulasi pemijahan individual dan massal yang didahului dengan ganti kulit pada induk betina sebagai indikator pemijahan. Pemijahan massal pada bulan gelap menghasilkan induk betina membawa telur terbanyak dibandingkan pemijahan individual pada bulan gelap dan pemijahan massal pada bulan terang. Konsentrasi kolesterol dan asam-asam lemak telur mengalami perubahan mengikuti lama pengeraman oleh induk yang menunjukkan terjadinya peningkatan kematangan telur (P<0,05).Spiny lobster (Panulirus homarus) hatchery has not been developed in Indonesia. Major constraints were limited broodstock spawning techniques, low incidence of eggs-berried broodstock, and unknown eggs profile. This study aimed to evaluate the effects of eyestalk ablation, spawning methods and moon circulation to molted, the number of eggs berried of females, and eggs-berried cholesterol and fatty acids profiles. Individual and mass spawning during full and new moon were used in this studies. Female and male broodstocks were used for consecutive spawning with ratio 2:1. The first study was used individual spawning during new moon. The second and third studies were used mass spawning during full moon and new moon, respectively. Eggs-berried profile compared concentration of cholesterol and fatty acids during 1, 2, and 3-4 weeks. Results showed eyestalk ablation stimulated individual or mass spawned and molted of female as early indicator of spawning. Full moon and mass spawning supported more eggs-berried female broodstock than that of other methods. Cholesterol and fatty acids showed different concentration within 1, 2, and 3-4 weeks of eggs-berried that supported eggs maturity (P<0.05).

scholarly journals Lunar periodicity in catch rate and reproductive condition of adult eastern king prawns, Penaeus plebejus, in coastal waters of south-eastern Queensland, Australia

1996 ◽  
Vol 47 (1) ◽  
pp. 67 ◽  
Author(s):  
AJ Courtney ◽  
DJ Die ◽  
JG McGilvray
Keyword(s):  
Coastal Waters ◽  
Full Moon ◽  
Lunar Cycle ◽  
Catch Rate ◽  
Lunar Phase ◽  
Reproductive Condition ◽  
Ovary Weight ◽  
South Eastern ◽  
New Moon ◽  
Catch Rates

This study examined the lunar and die1 variation in catch rates and reproductive condition of adult eastern king prawns, Penaeus plebejus, in relatively deep (160 m) coastal waters off south- eastern Queensland. Females numerically dominated catches over most of the lunar cycle and constituted 76% of the weight of the catch. Analysis of variance (ANOVA) revealed an interaction between lunar phase and sex; catches peaked during Lunar Phase 3 (full moon � 3 days) and were particularly marked for males. This was the only period during the lunar cycle when the sex ratio approached 1 : 1. There was also an interaction between trawl-time and sex; male catch rates were at a minimum early in the evening, whereas female catch rates were at a maximum then and declined throughout the night. Trawler logbook catch rate data from the same area over a similar period indicated an interaction between lunar cycle and lunar phase. ANOVA revealed an effect of the interaction between phase and sex on the incidence of soft prawns; the incidence of soft males increased during Phase 4 (half moon waning to new moon � 3 days). Ovary weight also varied between phases and was higher during Phases 2 (half moon waxing to full moon � 3 days) and 4 (half moon waning to new moon � 3 days). Trends in the ovary weight and the incidence of histologically mature and ripe females suggested there are two periods of increased spawning activity during each lunar cycle. A cyclic regression fitted to the data explained 93% of the variation in the incidence of ripe females between samples. The influence of these cyclic trends in catch rate and reproductive condition should be considered when monitoring the spawning stock in the fishery and when planning sampling strategies in any future reproductive studies.

Decapitated Lunar Goddesses in Aztec Art, Myth, and Ritual

1997 ◽  
Vol 8 (2) ◽  
pp. 185-206 ◽  
Author(s):  
Susan Milbrath
Keyword(s):  
Solar Eclipse ◽  
Seasonal Cycle ◽  
Full Moon ◽  
The Sun ◽  
The Moon ◽  
Seasonal Transition ◽  
The Earth ◽  
New Moon ◽  
The Demonic

AbstractAztec images of decapitated goddesses link the symbolism of astronomy with politics and the seasonal cycle. Rituals reenacting decapitation may refer to lunar events in the context of a solar calendar, providing evidence of a luni-solar calendar. Decapitation imagery also involves metaphors expressing the rivalry between the cults of the sun and the moon. Huitzilopochtli's decapitation of Coyolxauhqui can be interpreted as a symbol of political conquest linked to the triumph of the sun over the moon. Analysis of Coyolxauhqui's imagery and mythology indicates that she represents the full moon eclipsed by the sun. Details of the decapitation myth indicate specific links with seasonal transition and events taking place at dawn and at midnight. Other decapitated goddesses, often referred to as earth goddesses with “lunar connections,” belong to a complex of lunar deities representing the moon within the earth (the new moon). Cihuacoatl, a goddess of the new moon, takes on threatening quality when she assumes the form of a tzitzimime attacking the sun during a solar eclipse. The demonic new moon was greatly feared, for it could cause an eternal solar eclipse bringing the Aztec world to an end.

scholarly journals Mixing it up in Alaska: Habitat use of adult female Steller sea lions reveals a variety of foraging strategies

Ecosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
Author(s):  
Michelle E. Lander ◽  
Brian S. Fadely ◽  
Thomas S. Gelatt ◽  
Jeremy T. Sterling ◽  
Devin S. Johnson ◽  
...  
Keyword(s):  
Habitat Use ◽  
Adult Female ◽  
Foraging Strategies ◽  
Steller Sea Lions ◽  
Sea Lions

Foraging strategies involved in habitat use of shorebirds at the intertidal area of Chongming Dongtan, China

2006 ◽  
Vol 22 (4) ◽  
pp. 559-570 ◽  
Author(s):  
Kai Jing ◽  
Zhijun Ma ◽  
Bo Li ◽  
Jinhua Li ◽  
Jiakuan Chen
Keyword(s):  
Habitat Use ◽  
Foraging Strategies ◽  
Intertidal Area

Habitat use of co-occurring burying beetles (genus Nicrophorus) in southeastern Ontario, Canada

2020 ◽  
Vol 98 (9) ◽  
pp. 591-602
Author(s):  
K.W. Burke ◽  
J.D. Wettlaufer ◽  
D.V. Beresford ◽  
P.R. Martin
Keyword(s):  
Habitat Use ◽  
Forest Canopy ◽  
Habitat Associations ◽  
Habitat Characteristics ◽  
Habitat Partitioning ◽  
Shared Resources ◽  
Burying Beetles ◽  
Local Diversity ◽  
Nicrophorus Orbicollis ◽  
Nicrophorus Marginatus

The coexistence of closely related species plays an important role in shaping local diversity. However, competition for shared resources can limit the ability of species to coexist. Many species avoid the costs of coexistence by diverging in habitat use, known as habitat partitioning. We examine patterns of habitat use in seven co-occurring species of burying beetles (genus Nicrophorus Fabricius, 1775), testing the hypothesis that Nicrophorus species partition resources by occupying distinct habitats. We surveyed Nicrophorus abundance and 54 habitat characteristics at 100 random sites spanning an environmentally diverse region of southeastern Ontario, Canada. We found that three species occupied distinct habitat types consistent with habitat partitioning. Specifically, Nicrophorus pustulatus Herschel, 1807, Nicrophorus hebes Kirby, 1837, and Nicrophorus marginatus Fabricius, 1801 appear to be specialists for forest canopy, wetlands, and open fields, respectively. In contrast, Nicrophorus orbicollis Say, 1825, Nicrophorus sayi Laporte, 1840, and Nicrophorus tomentosus Weber, 1801 appear to be generalists with wide breadths of habitat use. We were unable to identify the habitat associations of Nicrophorus defodiens Mannerheim, 1846. Our findings are consistent with habitat acting as an important resource axis along which some Nicrophorus species partition; however, divergence along other resource axes (e.g., temporal partitioning) also appears important for Nicrophorus coexistence.

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