OOIR: Observatory of International Research

Papers

(The median citation count of Zoological Science is 1. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2021-08-01 to 2025-08-01.)

Article	Citations
Changes in Behavior and Diel Melatonin Secretion Toward Estivation in Western Sand Lance, Ammodytes japonicus (Uranoscopiformes, Ammodytidae)	38
Comparative Observation and Analysis of Preference Behavior Based on Three Types of Taxes and Locomotor Activity in the Goldfish, Carassius auratus	27
Development of the Pronotal Explanate Margin, a Novel Evolutionary Trait in Tortoise Beetles	18
It Pays to Sit Tight: Stable Night-Time Incubation Increases Hatching Success in Urban and Forest Great Tits, Parus major	11
Ontogenetic Expressions of Sexually Dimorphic Traits in the Skeleton Shrimp Caprella scaura (Crustacea: Amphipoda)	10
Embryonic Development of the Gastrodermis in the Coral Acropora tenuis	9
Yawning and Its Temperature-Dependent Modulation in Leopard Geckos	9
Timeless Plays an Important Role in Compound Eye-Dependent Photic Entrainment of the Circadian Rhythm in the Cricket Gryllus bimaculatus	8
Consistent Negative Correlations between Parasite Infection and Host Body Condition Across Seasons Suggest Potential Harmful Impacts of Salmincola markewitschi on Wild White-Spotted Charr, Salvelinus	7
Topotype-Based Chromosomal Diversity among Five Species of Freshwater Armored Catfishes in the Hypostomus auroguttatus Supergroup (Actinopterygii: Siluriformes)	7
Endocrine Regulation of Aging in the Fruit Fly Drosophila melanogaster	7
Characterization of Anthozoan-Specific Opsins from a Reef-Building Coral, Acropora tenuis, as Gq-Coupled Opsins	6
Population Genetics of the Asian Parti-Colored Bat, Vespertilio sinensis: Insights into Seasonal Migration in the Japanese Archipelago	6
Landscape Genetic Analysis for the Japanese Wild Boar in the Early Expanding Stage in the Hokuriku Region of Japan	6
Volume X-Ray Micro-Computed Tomography Analysis of the Early Cephalized Central Nervous System in a Marine Flatworm, Stylochoplana pusilla	5
The Mitochondrial Phosphatase PTPMT1 is Required for the Proper Growth Rate in the Red Flour Beetle, Tribolium castaneum	5
Acetylcholine Inhibits Spontaneous Firing Activity of Terminal Nerve GnRH Neurons in Medaka	5
At-Sea Habitat Use of Rhinoceros Auklets Breeding in the Shelf Region of Eastern Hokkaido	5
Distribution and Population Genetic Structure of the Hau Giang Medaka, Oryzias haugiangensis, Along the East Coast of the Indochinese Peninsula	5
Wnt4a Is Indispensable for Genital Duct Elongation but Not for Gonadal Sex Differentiation in the Medaka, Oryzias latipes	5
Morphological Analysis of the Olfactory System of the Pig-Nosed Turtle, Carettochelys insculpta	5
Molecular Phylogeny and Taxonomy of the Coral Genus Cyphastrea (Cnidaria, Scleractinia, Merulinidae) in Japan, With the First Records of Two Species	5
Evaluation of Nitrogen Source Uptake by the Bivalve Nuttallia olivacea Fed with 15N-Labeled Diatoms	5
The Phylogenetic Position of Branchamphinome (Annelida, Amphinomidae) with a Description of a New Species from the North Pacific Ocean	5
New Invasive Leaf Gall-Inducing Wasps Ophelimus cracens sp. nov. and Epichrysocharis burwelli on Eucalypts in Taiwan	5

Obituary	5
Feeding Strategy of Wild Japanese Martens (Martes melampus) in Northern Japan	4
The Bryozoan Cauloramphus magnus (Cheilostomata: Calloporidae) in Northern Japan Includes Multiple, Co-occurring Cryptic Species	4
Genetic Analysis Reveals Dispersal Patterns of Japanese Serow in Two Different Habitats of a Mountainous Region	4
Symbiotic Algae of Acoel Species in the Seto Inland Sea and Symbiont Selectivity in the Hosts	4
A New Heteronemertean Genus with Variable Potential of Anterior Regeneration for Species Formerly Belonging to Lineus (Nemertea: Pilidiophora)	4
Epicatechin Alters the Activity of a Neuron Necessary for Long-Term Memory of Aerial Respiratory Behavior in Lymnaea stagnalis	4
Management of Nuisance Macromoths in Expressways through Academic-Industrial Collaboration: Light Trap Designed on the Basis of Moths' Preferences for Light Attributes	4
Food Habits of the Japanese Dormouse in the Yatsugatake Mountains, Japan	4
A New Species of Prosadenoporus (Nemertea: Eumonostilifera) from the North-East Coast of the Bay of Bengal, India	4
Not Ancient But Neotenic: Neotenactis amateras gen. et sp. nov., the First Record of a Gonactiniid Anemone from the North Pacific (Cnidaria: Anthozoa: Enthemonae)	4
Beautiful Claws of a Tiny Water Bear: a Review and Proposal for Claw Configuration	4
Canonical and Non-Canonical Functions of Erythropoietin and Its Receptor in Mature Nucleated Erythrocytes of Western Clawed Frog, Xenopus tropicalis	4
Transcriptomes of Giant Sea Anemones from Okinawa as a Tool for Understanding Their Phylogeny and Symbiotic Relationships with Anemonefish	3
Association of Aquaporin 7 and 9 with Obesity and Fatty Liver in db/db Mice	3
The Growth Zones of Test Plates in Four Spatangoid Echinoid Species: Irregular Pattern	3
CRISPR-Cas9-Mediated Gene Knockout in a Non-Model Sea Urchin, Heliocidaris crassispina	3
Convergent Gene Duplication in Arctic and Antarctic Teleost Fishes	3
Contrasting Size Distributions among the Wing Spots of a Pierid Butterfly Suggest Different Selective Histories	3
Visual Perception of Density and Density-Dependent Growth in Medaka (Oryzias latipes): A Suitable Model for Studying Density Effects in Fish	3
New Records of Azooxanthellate Scleractinian Corals (Cnidaria: Anthozoa) from Sagami Bay and Suruga Bay, Japan	3
Phenotypic Plasticity of Salamander Hatchlings in the Pre-Feeding Stage in Response to Future Prey	3
A Predator-Elicited Vocalization in Male Japanese Bush Warblers: Temporal and Spatial Singing Patterns in Relation to Presence of Conspecific Females	3
Are Amphibian Eggs a Precious Food Resource for Cynops pyrrhogaster (Amphibia: Urodela) in Spring?	3
Temperature Acclimation and Cold Tolerance in Caenorhabditis Elegans are Regulated by Multiorgan Coordination	3
The Compound Eye Regulates Free-Running Period and Stability of the Circadian Locomotor Rhythm in the Cricket Gryllus bimaculatus	3
A Taxonomic List of Sea Spiders (Arthropoda, Pycnogonida) from Japanese Waters	3
A Manually Curated Gene Model Set for an Ascidian, Ciona robusta (Ciona intestinalis Type A)	3
Three New Earthworm Species of the Genera Amynthas and Metaphire (Oligochaeta: Megascolecidae) From Leshan, China	3
Lineid Heteronemerteans (Nemertea: Pilidiophora) from Sagami Bay, Japan, with Some Proposals for the Family-Level Classification System	3
A New Polychaete, Scolelepis (Parascolelepis) Brunnea sp. nov. (Annelida: Spionidae), from Korea	3
Sperm Size Decreases With Increasing Pheomelanin Pigmentation but Not With the Amount of Glutathione in the Barn Swallow	3
Oxytocin/Vasopressin-Like Peptide in the Central Nervous System and Ovaries of the Mud Crab Scylla olivacea	2
Corrigenda	2
A New Species of the Blind Cave Loach Genus Protocobitis (Cypriniformes: Cobitidae), Protocobitis longicostatus sp. nov., from Guangxi, China	2
Ovarian Development and Larval Release of the Hermit Crab Clibanarius eurysternus (Hilgendorf, 1879) (Decapoda: Anomura: Diogenidae) in Okinawa, Japan	2
Occurrence of Cruzia tentaculata Larvae in the Land Snail Megalobulimus abbreviatus—Influence of Natural Parasite Load on Snail Physiology	2
Metabolic Water As a Route for Water Acquisition in Vertebrates Inhabiting Dehydrating Environments	2
Ovarian Follicle Development in Ascidians	2
Molecular Identification and Genetic Variation of Rattus Species From Oil Palm Plantations of Malaysia Based on Mitochondrial Cytochrome Oxidase Subunit I (COI) Gene Sequences	2
Circadian Rhythm and Endocrinological Control on the Swimming and Sand Burrowing Behaviors of Japanese Sand Lances Ammodytes spp. (Uranoscopiformes, Ammodytidae)	2
Teratorn and Its Related Elements – a Novel Group of Herpesviruses Widespread in Teleost Genomes	2
Medaka Terb1 Mutant Displays Defects of Synaptonemal Complex Formation and Sexual Difference in Gametogenesis	2
Photoperiodism of Diapause Induction in the Silkworm, Bombyx mori	2
Metabolic and Hormonal Changes Associated with Vitellogenesis in Salvator merianae Lizards	2
Satellite Tracking of Migration Routes of the Eastern Buzzard (Buteo japonicus) in Japan through Sakhalin	2
Sinking Down or Floating Up? Current State of Taxonomic Studies on Marine Invertebrates in Japan Inferred from the Number of New Species Published between the Years 2003 and 2020	2
Fusceulimoides kohtsukai gen. et sp. nov., a Minute Eulimid Gastropod Parasitic on the Little Brittle Star Ophiactis savignyi in Central Japan	2
Growth, Feeding, and Age of the Inshore Hagfish, Eptatretus burgeri	2
CD34 is Expressed in Endothelial Cells in Embryonic Testes and is Additionally Expressed in Non-Endothelial Cells in Postnatal Mouse Testes	2

Ancient Admixture in Freshwater Halfbeaks of the Genus Nomorhamphus in Southeast Sulawesi	2
Temporal Changes in Demography and Genetic Diversity of Oriental Storks at the Stage of Long-Term Captive Propagation and Reintroduction Initiation	2
Analysis of Genetic Structure and Genetic Diversity in Japanese Black Kite Population Using mtDNA	2
Transcriptome Analysis Reveals the Alternative Splicing Changes in the Immune-Related Genes of the Giant Panda (Ailuropoda melanoleuca), in Response to the Canine Distemper Vaccine	2
Acoustic Characteristics of Songs in a Recently Established Population of the Japanese Bush Warbler on an Oceanic Island	2
Dynamics of Laterality in the Cuttlefish Sepia recurvirostra through Interactions with Prey Prawns	2
Time-Comparator Neural Circuits of Gymnotiform Electric Fishes	2
Host Size Selection in the Ectoparasite Tachaea chinensis (Isopoda: Corallanidae) under Laboratory Conditions	2
Observations on Predation in Paranthura japonica Richardson, 1909 (Isopoda: Cymothoida: Paranthuridae)	1
Comparative Study of Gamma Radiation Tolerance between Desiccation-Sensitive and Desiccation-Tolerant Tardigrades	1
Phylogeographic History of Endangered Hokuriku Salamander, Hynobius takedai (Amphibia: Caudata)	1
First Record of the Deep-Sea Sea Spider Bathypallenopsis californica (Arthropoda: Pycnogonida) from the Northwestern Pacific, with a Note on an Attached Crinoid	1
Update on Feeding Regulation by Ghrelin in Birds: Focused on Brain Network	1
Growth-Promotion Effects of Dissolved Amino Acids in Three Species of Hynobius Salamander Hatchlings	1
Environmentally Dependent Alteration of Reproductive Strategies and Juvenile Hormone Signaling in Daphnia (Crustacea: Cladocera)	1
Genetic Disruption of cyp21a2 Leads to Systemic Glucocorticoid Deficiency and Tissues Hyperplasia in the Teleost Fish Medaka (Oryzias latipes)	1
Cloning and Characterization of Cyp7a1 and Cyp27a1 Genes from the Non-Parasitic Japanese Lamprey Lethenteron reissneri	1
Mfge8 Knockout Affects Tail Resorption Speed During Xenopus Metamorphosis	1
CRISPR/Cas9- and Single-Stranded ODN-Mediated Knock-In in Silkworm Bombyx mori	1
Constant Light, Pdp1, and Tim Exert Influence on Free-Running Period of Locomotor Rhythms in the Cricket Gryllus bimaculatus	1
Establishment of a New Model Sea Anemone for Comparative Studies on Cnidarian-Algal Symbiosis	1
Polydendrorhynchus amaleshii sp. nov., a New Species With Branched Proboscis (Nemertea: Heteronemertea) From the North-East Coastal Bay of Bengal	1
Environmental Adaptation in Animals	1
An Indirect Cost of Male-Male Aggression Arising from Female Response	1
Analysis of Genetic Structure and Genetic Diversity in Japanese Grey-Headed Lapwing Population Using mtDNA	1
New Species of Lower-Shelf to Upper-Slope Ctenostome Bryozoans from Pacific Japan, with a Family Range Extension	1
Electromyography of Flight Muscles in Free-Flying Chestnut Tiger Butterfly, Parantica sita	1
Co-Occurrence of Gastropods of the Genus Melanella (Mollusca: Eulimidae) Parasitizing the Black Sea Cucumber Holothuria leucospilota in Central Japan: Implications for Their Geographic Distribution an	1
Cloning and Expression Analysis of TGF-β Type I Receptor Gene in Hyriopsis cumingii	1
In Vitro Phagocytosis of Different Dinoflagellate Species by Coral Cells	1
Sacculina-Induced Morphological Feminization in the Grapsid Crab Pachygrapsus crassipes	1
Seasonal and Sex Differences in Arm Loss Frequency in Two Small Coastal Octopus Species (Octopus parvus and Hapalochlaena cf. fasciata)	1
Guiding Light: Mechanisms and Adjustments of Environmental Light Interpretation with Insights from Platynereis dumerilii and Other Selected Examples	1
Transcriptome Analysis in a Scleractinian Coral, Acropora tenuis, during the Spawning Season With Reference to the Gonadal Condition	1
Radula and Shell Microstructure Variations are Congruent with a Molecular Estimate of Shallow-Water Japanese Chitons	1
Use of Visual Information by Ant Species Occurring in Similar Urban Anthropogenic Environments	1
Functional Analysis of a Juvenile Hormone Inducible Transcription Factor, Krüppel homolog 1, in the Bean Bug, Riptortus pedestris	1
A New Species of Small Water Strider in the Genus Microvelia (Hemiptera: Heteroptera: Veliidae) from Aichi Prefecture, Honshu, Japan	1
Developmental Staging of Sexual Egg Formation in Daphnia pulex: Unmated Females Resorb Meiotic Oocytes to Resist Starvation	1
Live Freshwater Parasite, Salmincola californiensis (Copepoda: Lernaeopodidae), on the Gills of an Ocean-Migrating Steelhead Trout (Oncorhynchus mykiss) and Discussion on the Origin and Survival of th	1
Phylogenetics and Population Genetics of the Asian House Shrew, Suncus murinus–S. montanus Species Complex, Inferred From Whole-Genome and Mitochondrial DNA Sequences, with Special Reference to the Ry	1
Effect of Natural Seasonal Changes in Photoperiod and Temperature on Immune Function in Striped Hamsters	1
A CatSper-Uninvolved Mechanism to Induce Forward Sperm Motility in the Internal Fertilization	1
First Record of Elasmobranch Hosts for the Gnathiid Isopod Crustacean Thaumastognathia: Description of Thaumastognathia bicorniger sp. nov.	1
Comparative Phylogenetic Study on Host Newts (Caudata: Salamandridae) and Parasitic Mites (Acariformes: Hydrachnidia: Hygrobatidae) in East and Southeast Asia	1
Dive Deep: Bioenergetic Adaptation of Deep-Sea Animals	1
Segment-Dependent Gene Expression Profiling of the Cartilaginous Fish Nephron Using Laser Microdissection for Functional Characterization of Nephron at Segment Levels	1
Periodic Stretching of Cultured Myotubes Enhances Myofibril Assembly	1
A Relaxin-Like Gonad-Stimulating Peptide Appears in the Early Development of the Starfish Patiria pectinifera	1
Populations of the Intertidal Crab Macrophthalmus banzai are Not Grouped by Latitude: Taiwan Population is Genetically Closer to the Populations in the Japanese Mainland Than the Ryukyu Islands	1
Microfocus X-Ray Computed Tomography of Paraplanocera oligoglena (Platyhelminthes: Polycladida) with an Evaluation of Histological Sections After Scanning	1
Evolution of Temperature Receptors and Their Roles in Sensory Diversification and Adaptation	1
Morphological Study of Left–Right Head Asymmetry in Doubledaya bucculenta (Coleoptera: Erotylidae: Languriinae)	1
A New Species of Sea Whip Gorgonian-Associated Zoantharian (Cnidaria: Anthozoa: Hexacorallia: Parazoanthidae) from the Ryukyu Islands, Japan, with Subgeneric Subdivision of Genus Umimayanthus	1
Anemonefish Chromatophore Distribution and Organization Revealed by TEM Studies	1
Ontogenetic Expression of Aquaporins in the Kidney and Urinary Bladder of the Japanese Tree Frog, Dryophytes japonicus	1
Contents	1
Taxonomic Accounts and Phylogenetic Positions of the Far East Asian Centipedes Scolopocryptops elegans and S. curtus (Chilopoda: Scolopendromorpha)	1
Evaluation of Visual and Tactile Perception by Plain-Body Octopus (Callistoctopus aspilosomatis) of Prey-Like Objects	1
Phototaxis in Two Shallow-Water Zeuxo Species (Crustacea: Tanaidacea)	1
Mate Discrimination Using Chemical Cues by Male Guppies	1
Description of a New Species of Hua (Gastropoda: Semisulcospiridae) from Guizhou, China, Based on Morphology and Molecular Evidence	1
Male Guppies Recognize Familiar Conspecific Males by Their Face	1
Patterns of Sexual Dimorphism, Static Allometry, and Modularity in the Skull of the Ethiopian White-Footed Mouse, Stenocephalemys albipes (Rodentia: Muridae)	1
Decreased Diversity and Abundance of Marine Invertebrates at CO2 Seeps in Warm-Temperate Japan	1