A5103149149- Coral and Marine Ecosystems Studies
- Marine and fisheries research
- Reproductive biology and impacts on aquatic species
- Marine and coastal plant biology
- Sperm and Testicular Function
- Fish Ecology and Management Studies
- Animal Behavior and Reproduction
- Fish biology, ecology, and behavior
- Ichthyology and Marine Biology
- Crustacean biology and ecology
- Ocean Acidification Effects and Responses
- Reproductive Biology and Fertility
- Aquaculture Nutrition and Growth
- Marine Sponges and Natural Products
- Marine Bivalve and Aquaculture Studies
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Fish Biology and Ecology Studies
- Wildlife Ecology and Conservation
- Plant and animal studies
- Aquatic Ecosystems and Biodiversity
- Microplastics and Plastic Pollution
- Physiological and biochemical adaptations
- Marine Invertebrate Physiology and Ecology
- Calcium Carbonate Crystallization and Inhibition
- Biocrusts and Microbial Ecology
University of the Ryukyus
2016-2025
University of the Ryukyus University Hospital
2009-2024
University of Tsukuba
2011
University of Cambridge
2010
Cambridge University Press
2010
The University of Tokyo
2003-2005
Okayama University of Science
2004
Tokyo University of the Arts
2003-2004
Tohoku Medical and Pharmaceutical University
1993-1995
Summary Ocean acidification is now recognized as a threat to marine ecosystems; however, the effect of ocean on fertilization in organisms still largely unknown. In this study, we focused sperm flagellar motility broadcast spawning reef invertebrates (a coral and sea cucumber). Below pH 7.7, predicted occur within next 100 years, was seriously impaired these organisms. Considering that indispensable for transporting paternal haploid genome fertilization, taking place seawater may decline not...
Abstract The discovery of multi-species synchronous spawning scleractinian corals on the Great Barrier Reef in 1980s stimulated an extraordinary effort to document times other parts globe. Unfortunately, most these data remain unpublished which limits our understanding regional and global reproductive patterns. Coral Spawning Database (CSD) collates much disparate into a single place. CSD includes 6178 observations (3085 were unpublished) time or day for over 300 species 61 genera from 101...
Reef-building corals provide the structural basis for one of Earth's most spectacular and diverse but increasingly threatened ecosystems. The reef-building coral genus Acropora may have undergone substantial speciation during Pleistocene climate sea-level changes. Here, we aimed to evaluate history four morphologically similar tabular species (Acropora aff. hyacinthus, A. cf. bifurcata, cytherea, subulata) using an integrative approach with morphology, genetic, reproduction methodology....
Abstract Elevated temperatures cause coral bleaching and reef degradation. However, may have strategies to survive by reproducing more heat-tolerable larvae. We examine the direct carryover effects of thermal stress on fecundity fitness in reef-building Acropora tenuis . Fragments from same colony are subjected control temperature (~27.5 °C) or heat (~31 for ten days. then adults (egg number size) tolerance larvae recruits (survival rates, growth, size). The stressed fragments show a...
Abstract Rabbitfishes are known to spawn synchronously around the species‐specific lunar phase. It is considered that they perceive and utilize cues from moon in order be synchronized gonadal development spawning with cycle. Using golden rabbitfish, Siganus guttatus , which spawns first quarter during reproductive season, we measured fluctuation of melatonin levels examined response fish moonlight intensity. Daily concentration blood rabbitfish showed low daytime high night‐time, suggesting...
SUMMARY Corals perform simultaneous mass spawning around the full moon. Most Acropora species release gamete bundles, which are a complex of eggs and sperm, into seawater. Then, bundles separated sperm. Eggs fertilized when sperm come in contact with each other. However, it is still unclear how meet same presence many different guard against fertilization attempts by species. In this study, we observed that A. digitifera, gemmifera tenuis showed motility initiation/attraction close to eggs....
SUMMARY Euryhaline tilapia Oreochromis mossambicus acclimates to the external spawning environment by modulating its mechanism for regulating sperm motility. Adaptation of was performed acclimating fish in various environments. In this paper, regulatory mechanisms freshwater-acclimated were studied detail. Tilapia motility vigorous hypotonic conditions and decreased with increasing osmolality. Sperm reduced when extracellular Ca2+ chelated; however, not a major factor activation since motile...
Mesophotic habitats are potential refugia for corals in the context of climate change. The seawater temperature a mesophotic habitat is generally lower than shallow habitat. However, susceptibility and threshold temperatures not well understood. We compared 11 species to understand their thermal stress thresholds using physiological parameters. Coral fragments were exposed two treatments, with set at ~30°C ~31°C, low-temperature treatment ~28°C as “no stress” condition 14 days. found that...
Abstract Background Rising seawater temperatures increasingly threaten coral reefs. The ability of larvae to withstand heat is crucial for maintaining reef ecosystems. Although several studies have investigated larvae’s genetic responses thermal stress, most relied on pooled sample sequencing, which provides population-level insights but may mask individual genotype variability. This study uses larval sequencing investigate genotype-specific stress and the selective pressures shaping their...
AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 15:299-302 (2012) - DOI: https://doi.org/10.3354/ab00436 Sperm motility of scleractinian coral Acropora digitifera under preindustrial, current, and predicted ocean acidification regimes Masako Nakamura1,*, Masaya Morita2 1Okinawa Institute Science Technology, Okinawa 904-0412, Japan 2Sesoko Station, Tropical Biosphere Research...
Demembranated euryhaline tilapia Oreochromis mossambicus sperm were reactivated in the presence of concentrations excess 10−6 M Ca2+. Motility features changed when Ca2+ increased from to 10−5 M. Although beat frequency did not increase, shear angle and wave amplitude flagellar beating increased, suggesting that sliding velocity microtubules axoneme, which represents dynein activity, rises with an increase Thus, it is possible binds proteins activate motility as a result enhanced activity....
SUMMARY Increased intracellular pH ([pH]i) activates dynein in sea urchin and mammalian sperm induces activation of flagellar motility. It is thought that cAMP-dependent protein phosphorylation associated with motility through increasing [pH]i, but little attention has been given to the cAMP-independent also induced by the[pH]i increase. The present study demonstrates increase in[pH]i starfish axonemal proteins independently cAMP. Flagellar intact was activated when [pH]i raised addition...
Abstract Larval dispersal and postsettlement survival of corals play significant roles in the maintenance coral populations. Most acquire their symbiotic algae (Symbiodiniaceae) from environment each generation (horizontal transmission). For horizontal transmitters, quick establishment symbiosis is important for survival, since photosynthetic activity provides energy. However, recent studies have indicated that oxidative stress resulting photosynthesis might also harm larvae. Therefore, it...
Summary Ocean acidification is an ongoing threat for marine organisms due to the increasing atmospheric CO2 concentration. Seawater has a serious impact on physiologic processes in at all life stages. On other hand, potential tolerance external pH changes been reported coral larvae. Information about possible mechanisms underlying such responses, however, scarce. In present study, we examined effects of acidified seawater larvae Acropora digitifera molecular level. We targeted two heat shock...
Sesoko Station, Okinawa, has been the site of many significant advances in coral reproductive research and it continues to be a preferred destination for both Japanese international researchers. Consequently, there are decades spawning observations, which we present explore here with aim making easier predict when species spawn at Station. The data include over 700 observations from 87 reef-building hermatypic corals. Almost all occurred between dusk dawn, most activity concentrated 2 4...