Zoological Science最新文献

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Daily Rhythmic Changes in Kisspeptin Gene Expression and Testosterone Hormone in Male Syrian Hamsters (Mesocricetus auratus). 雄性叙利亚仓鼠(Mesocricetus auratus) Kisspeptin基因表达和睾丸激素的日节律变化
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250118
Emine İnci Balkan, Bülent Gündüz
{"title":"Daily Rhythmic Changes in Kisspeptin Gene Expression and Testosterone Hormone in Male Syrian Hamsters (<i>Mesocricetus auratus</i>).","authors":"Emine İnci Balkan, Bülent Gündüz","doi":"10.2108/zs250118","DOIUrl":"https://doi.org/10.2108/zs250118","url":null,"abstract":"<p><p>This study examines how testosterone levels and kisspeptin gene expression are affected in male Syrian hamsters following pinealectomy and photoperiod modification. By examining the rhythmic changes in these parameters under long (16L: 8D) and short (8L: 16D) photoperiods, we aim to elucidate the role of melatonin and photoperiod in regulating seasonal reproductive physiology. One hundred and ninety-two male Syrian hamsters were equally divided into four groups (<i>n</i> = 48/group). Two groups were pinealectomized (pinx) and the other two groups were sham-operated (control). Treatment and control groups were then exposed to either a long photoperiod (LP) of 16 hours light/8 hours dark or a short photoperiod (SP) of 8 hours light/16 hours dark for 30 days and then sampled at specific temporal intervals (ZT0, ZT4, ZT8, ZT12, ZT16, and ZT20) at which hypothalamic tissues and serum samples were collected. Kiss1 mRNA expression and protein levels were measured using qPCR and Western blotting, while testosterone and melatonin levels were determined via ELISA. Under a long photoperiod, Kiss1 mRNA expression and protein levels exhibited significant diurnal variation, peaking during the light phase (<i>P</i> < 0.05). Pinealectomy disrupted these rhythms, leading to altered testosterone levels. Under a short photoperiod, a marked change in Kiss1 expression and testosterone was also observed, emphasizing photoperiod and melatonin's role in synchronizing reproductive rhythms. These findings highlight the central role of melatonin not just in modulating levels, but also in synchronizing the daily reproductive rhythms necessary for seasonal adaptation.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"388-396"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Origin and History of the Zoological Collection at Stazione Zoologica Anton Dohrn Di Napoli. 安东·多恩·迪·那不勒斯动物园藏品的起源和历史。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250100
Akira Kihara, Andrea Travaglini
{"title":"The Origin and History of the Zoological Collection at Stazione Zoologica Anton Dohrn Di Napoli.","authors":"Akira Kihara, Andrea Travaglini","doi":"10.2108/zs250100","DOIUrl":"https://doi.org/10.2108/zs250100","url":null,"abstract":"<p><p>The Zoological Collection at the Stazione Zoologica Anton Dohrn di Napoli has been accumulating since research activities began in 1872. Following the opening of the collection room, known as \"Museo\", after 1906, the former collections were gathered there and Reinhard Gast became the first curator. Between 1910 and 1914, he left behind an accession record of 1098 preparations. We have found that at least 624 of these preparations remain in the current collection. These preparations bear at least five distinct types of labels applied by successive curators over the last 110 years. One hundred preparations still retain Gast's original labels and containers, and clearly exhibit his characteristic showcase-style arrangements. They are often displayed vertically on glass plates with fine threads and placed in rectangular or cylindrical glass jars with black backgrounds, with some specimens arranged to evoke their natural habitat at the bottom of the sea. Gast also produced species reference cards describing the biological and ecological characteristics of each species. Taken together, these features suggest that Gast intended the collection not only as a taxonomic reference, but also as a visual and ecological representation of the marine fauna of the Gulf of Naples-an early form of a biodiversity information resource.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"397-407"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Ultrastructure of Oogenesis in Actinarctus doryphorus (Heterotardigrada, Arthrotardigrada, Tanarctidae). 异步虫、节步虫、长步虫科放线猴卵发生的超微结构。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs260005
Atsushi C Suzuki, Reinhardt Møbjerg Kristensen
{"title":"Ultrastructure of Oogenesis in <i>Actinarctus doryphorus</i> (Heterotardigrada, Arthrotardigrada, Tanarctidae).","authors":"Atsushi C Suzuki, Reinhardt Møbjerg Kristensen","doi":"10.2108/zs260005","DOIUrl":"https://doi.org/10.2108/zs260005","url":null,"abstract":"<p><p>Ultrastructural studies of oogenesis in Heterotardigrada are limited. Here, we examined the ovarian organization of <i>Actinarctus doryphorus</i> using transmission electron microscopy and three-dimensional reconstruction. Four female specimens at different developmental stages, including a juvenile, were analyzed. The ovary is a single sac-like structure dorsally above the digestive tract, partially supported by longitudinal dorsal muscles. Early germ cells form anterior clusters interconnected by cytoplasmic bridges. Previtellogenic oocytes contain numerous mitochondria clustered around a prominent nuage, suggesting a conserved role in piRNA-mediated genome protection. Vitellogenic oocytes occupy the posterior half of the ovary, with the posterior-most cell developing as the egg and the remaining cells functioning as nurse cells. Nurse cells form a syncytium, and ER-rich accessory cells at the periphery likely contribute to yolk and material transfer. Large aggregations of lysosome-rich vesicles in peripheral ovarian cells suggest apoptotic degeneration of trophocytes and ER-rich cells after completing their function. These findings reveal that <i>A. doryphorus</i> exhibits polytrophic meroistic oogenesis with syncytial nurse cells, ER-rich accessory cells, and nuage-containing previtellogenic oocytes. This study provides the first comprehensive description of oogenesis in a heterotardigrade and highlights conserved mechanisms for cytoplasmic and genomic support during gametogenesis, suggesting avenues for exploring the evolutionary diversification of reproductive strategies in tardigrades.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"374-387"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Morphology and Development of Reproductive Organs in the Acoel Hofstenia atroviridis. atroviridael Hofstenia生殖器官的形态与发育。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250119
Rupandey Parekh, Coline Hermine, Yohei Otomo, Toru Miura
{"title":"Morphology and Development of Reproductive Organs in the Acoel <i>Hofstenia atroviridis</i>.","authors":"Rupandey Parekh, Coline Hermine, Yohei Otomo, Toru Miura","doi":"10.2108/zs250119","DOIUrl":"https://doi.org/10.2108/zs250119","url":null,"abstract":"<p><p>Reconstructing ancestral reproductive systems is crucial for understanding the evolution of bilaterian body plans. Yet, despite extensive research on some organ systems of the last common bilaterian ancestor, the evolution and development of reproductive systems remain poorly understood. To address this gap, we investigated postembryonic sexual development in the xenacoelomorph <i>Hofstenia atroviridis</i>, a basal acoel species belonging to the infraorder Prosopharyngida. We reared <i>H. atroviridis</i> from eggs to adults and described the ontogeny of its reproductive organs using histology and immunohistochemistry with muscle and neural markers, along with observations of mating behaviors in each size class. <i>Hofstenia atroviridis</i> is a protandrous simultaneous hermaphrodite whose sexual maturity correlates with body size rather than age, as observed in <i>Hofstenia miamia</i>. The male copulatory system comprises a seminal vesicle, granular vesicle, penis, and a single copulatory stylet, surrounded by regionally specialized musculature and innervation. In contrast, the female system consists of paired, asaccate ovaries with large, follicle cell-bound oocytes, lacking a discrete gonopore or copulatory organ. Fertilization occurs internally through traumatic insemination, and eggs are likely released through the mouth. Our findings reveal that the male reproductive system of <i>H. atroviridis</i> exhibits unexpected complexity and structural differentiation despite the organism's overall simplicity. We propose that sexual selection acting on a hermaphroditic reproductive system may have driven the evolution of a multifunctional copulatory organ in the Urbilateria. This study establishes <i>H. atroviridis</i> as a promising and comparative model for exploring the evolutionary origins of animal reproductive systems.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"349-363"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Membrane Progestin Receptors α and β (Paqr7 and 8) are Necessary for Oogenesis in Zebrafish. 膜孕激素受体α和β (Paqr7和8)是斑马鱼卵发生所必需的。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250120
Md Almamun Farid, Md Razain Tanvir, Takumi Mouri, Eisei Tsutsumi, Md Sohanur Rahman Sohan, Md Ekramul Hasan, Md Saydur Rahman, Chihiro Yamamoto, Akiteru Maeno, Toshinobu Tokumoto
{"title":"Membrane Progestin Receptors α and β (<i>Paqr7</i> and <i>8</i>) are Necessary for Oogenesis in Zebrafish.","authors":"Md Almamun Farid, Md Razain Tanvir, Takumi Mouri, Eisei Tsutsumi, Md Sohanur Rahman Sohan, Md Ekramul Hasan, Md Saydur Rahman, Chihiro Yamamoto, Akiteru Maeno, Toshinobu Tokumoto","doi":"10.2108/zs250120","DOIUrl":"https://doi.org/10.2108/zs250120","url":null,"abstract":"<p><p><i>Paqr7</i> and <i>paqr8</i> are genes encoding membrane progestin receptor αand β (mPRα and mPRβ, respectively), which are currently classified as members of the progestin and adipoQ receptor (PAQR) family. For mPRα, the first identified mPR gene, there are two paralogs in zebrafish, <i>paqr7a</i> and <i>paqr7b</i>. In order to elucidate the physiological functions of the mPR subtypes, we created gene knockout (KO) fish by editing seven <i>paqr</i> genes in zebrafish and analyzing their phenotypes. The null-mutant strains of <i>paqr7a</i>, <i>paqr7b</i>, and <i>paqr8</i> presented no significant abnormalities in reproductive functions. Thus, we generated a triple-gene knockout (TKO) strain of these highly related genes. The TKO strain had reduced fecundity and a high percentage of abnormal embryos. The embryos exhibited various types of abnormal morphology. In histological sections, a reduction in the number of nucleoli in germinal vesicles was observed. Additionally, the distribution of the nucleolus was abnormal. The amount of 18S and 28S ribosomal RNAs in the oocytes significantly increased. These analyses indicate that <i>paqr7a</i>, <i>paqr7b</i>, and <i>paqr8</i> are responsible for the production of the nucleolus, which is necessary for supplying the proper number of ribosomal RNAs into the cytoplasm of oocytes. Abnormal embryo development resulted from low-quality eggs in TKO zebrafish, suggesting that <i>paqr7a</i>, <i>paqr7b</i>, and <i>paqr8</i> mutations affect oogenesis. These results indicate that Paqr7a, Paqr7b, and Paqr8 are required for the preparation of the nucleolus during oogenesis. Insufficient formation of the nucleolus resulted in a higher quantity of ribosomal RNA in the cytoplasm, causing abnormal embryo development.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"364-373"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Description of Cerebratulus sardonyx sp. Nov. (Nemertea: Lineidae) from Kita-Koho Seamount, the Kyushu-Palau Ridge. 九州-帕劳脊Kita-Koho海山的sardonyx sp. Nov.描述(Nemertea: Lineidae)。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250125
Natsumi Hookabe, Yoshihiro Fujiwara, Hiroshi Kajihara
{"title":"Description of <i>Cerebratulus sardonyx</i> sp. Nov. (Nemertea: Lineidae) from Kita-Koho Seamount, the Kyushu-Palau Ridge.","authors":"Natsumi Hookabe, Yoshihiro Fujiwara, Hiroshi Kajihara","doi":"10.2108/zs250125","DOIUrl":"https://doi.org/10.2108/zs250125","url":null,"abstract":"<p><p><i>Cerebratulus sardonyx</i> sp. nov. is described from a single specimen collected at Kita-Koho Seamount on the Kyushu-Palau Ridge, a major submarine arc extending from southern Japan into the Philippine Sea. The specimen was obtained at a depth of 454 m using the remotely operated vehicle <i>KM-ROV</i> during cruise KM24-03C of the R/V <i>Kaimei</i>. An integrative taxonomic approach-combining external morphology of the living specimen, histology, and molecular phylogenetic analyses-was used to characterize the species. The new species is readily distinguished from all congeners by its vivid reddish-brown body crossed by numerous sharply defined opaque white transverse rings, together with a uniquely patterned head bearing orangish patches and alternating white and brown transverse bands. Phylogenetic analysis places the species within a clade referred to as Lineage J in a previous study, corresponding to the <i>Cerebratulus</i> clade. This discovery represents the first record of <i>Cerebratulus</i> Renier, 1804 from Japanese seamounts and the first described nemertean from the Kyushu-Palau Ridge.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"408-416"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Redescription of the Larval Trematode Taxon Monilicaecum ventricosum (Hemiuroidea: Didymozoidae) from Type Host Cololabis saira, with Inference of the Definitive Host Based on DNA Analysis. 脑室吸虫幼虫分类群(半纲:双虫科)的重新描述及基于DNA分析的最终寄主推断。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs260004
Masato Nitta, Masashi Uchiyama, Toshihiro Hayashi
{"title":"Redescription of the Larval Trematode Taxon <i>Monilicaecum ventricosum</i> (Hemiuroidea: Didymozoidae) from Type Host <i>Cololabis saira</i>, with Inference of the Definitive Host Based on DNA Analysis.","authors":"Masato Nitta, Masashi Uchiyama, Toshihiro Hayashi","doi":"10.2108/zs260004","DOIUrl":"https://doi.org/10.2108/zs260004","url":null,"abstract":"<p><p>The larval trematode taxon <i>Monilicaecum ventricosum</i> Yamaguti, 1942 (Didymozoidae) was redescribed from its type host, the Pacific saury <i>Cololabis saira</i> (Brevoort, 1856), collected from the North Pacific off Eastern Hokkaido, Japan. Because didymozoid larvae and adults differ markedly in morphology, linking these two stages using morphological data alone has traditionally been difficult. Consequently, the monotypic genus <i>Monilicaecum</i> Yamaguti, 1942 is currently regarded as a collective group, similar to genera established solely on larval forms of other trematodes. However, recent advances in molecular studies have enabled researchers to link larval and adult stages, clarify life cycles, and undertake more robust taxonomic evaluations. In this study, newly collected larval specimens were examined morphologically, and DNA barcodes (<i>28S</i>, <i>ITS</i>, and <i>cox1</i>) were generated to confirm their identity as <i>M. ventricosum</i> through morphological comparisons with type materials. These sequences were compared with those available in public databases to determine the corresponding adult stages and definitive hosts. Although no identical adult sequences were detected, <i>M. ventricosum</i> showed a close genetic relationship with four didymozoid species parasitizing the Australian yellowfin tuna, <i>Thunnus albacares</i> (Bonnaterre, 1788), suggesting that its definitive host is likely a species of <i>Thunnus</i> South, 1845. These findings provide essential molecular data for <i>M. ventricosum</i>, contribute to the taxonomic stability of Didymozoidae, and offer a foundation for future studies aimed at elucidating species boundaries and life-cycle connections within this group.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"417-425"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A New Species in the Rare Genus Mesocrista (Eutardigrada) from New York (U S A). 文章题目美国纽约稀有中游藓属一新种(Eutardigrada)。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs260003
Judy Dobles, Piotr Gąsiorek
{"title":"A New Species in the Rare Genus <i>Mesocrista</i> (Eutardigrada) from New York (U S A).","authors":"Judy Dobles, Piotr Gąsiorek","doi":"10.2108/zs260003","DOIUrl":"https://doi.org/10.2108/zs260003","url":null,"abstract":"<p><p>During a recent survey of tardigrades at the Cumming Nature Center (owned by the Rochester Museum & Science Center; New York, U S A), a new species of the rare and oligospecific genus <i>Mesocrista</i> was discovered. We provide an integrative description of this new species based on morphology and genetics (four standard DNA markers used in eutardigrade taxonomy). <i>Mesocrista ojagwaji</i> sp. nov. exhibits a combination of characters intermediate between those of <i>M. spitzbergensis</i> (Richters, 1903) and <i>M. revelata</i> Gąsiorek, Stec, Morek, Zawierucha, Kaczmarek, Lachowska-Cierlik, and Michalczyk, 2016, but the conducted phylogenetic analyses indicated that it is a sister species of the latter. Subtle morphological disparities with regard to <i>M. revelata</i> suggest a recent divergence event and deliver a new case of pseudocryptic tardigrade species.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"426-432"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tendon Regeneration Ability in Axolotl Limbs. 蝾螈肢体肌腱再生能力的研究。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250104
Ryusei Amada, Sakiya Yamamoto, Ayaka Ohashi, Haruki Nakayama, Saya Furukawa, Akira Satoh
{"title":"Tendon Regeneration Ability in Axolotl Limbs.","authors":"Ryusei Amada, Sakiya Yamamoto, Ayaka Ohashi, Haruki Nakayama, Saya Furukawa, Akira Satoh","doi":"10.2108/zs250104","DOIUrl":"https://doi.org/10.2108/zs250104","url":null,"abstract":"<p><p>Tendon injuries in humans often lead to significant functional impairments, necessitating effective regeneration methods. While mammalian tendon healing typically results in scar formation and functional loss, certain species such as axolotls exhibit remarkable regenerative abilities. This study investigates axolotl tendon regeneration following complete transection (tenotomy) and volumetric loss (tenectomy). Axolotl tendons, identified through histological and gene expression analyses, consist of collagens and exhibit specific tendon markers. Our results indicated complete regeneration of transected and partially removed tendons, with regenerating fibers becoming organized over time. Gene expression patterns of tendon markers further support the regeneration process. Denervation experiments suggested that nerves play a minimal role in axolotl tendon regeneration. Additionally, grafting GFP-labeled tendon tissue into wild-type animals revealed cellular dynamics during regeneration. Our results suggest that regenerated tendons consist of cells from the damaged tendon tissue and/or surrounding tissues. This dual cellular source suggests a complex mechanism for axolotl tendon regeneration. Overall, axolotls demonstrate superior tendon regeneration abilities, shedding light on potential mechanisms for mammalian tendon healing improvement. Understanding such mechanisms could lead to more effective tendon regeneration strategies in humans.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"341-348"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Identification of Pre-Settling Behavior Leading the Planula Larva to Settlement in the Coral Acropora. 导致浮藻幼虫在珊瑚顶孔定居的预沉降行为鉴定。
IF 1 4区 生物学
Zoological Science Pub Date : 2026-08-01 DOI: 10.2108/zs250096
Mayu Ishikawa, Masayuki Hatta
{"title":"Identification of Pre-Settling Behavior Leading the Planula Larva to Settlement in the Coral <i>Acropora</i>.","authors":"Mayu Ishikawa, Masayuki Hatta","doi":"10.2108/zs250096","DOIUrl":"https://doi.org/10.2108/zs250096","url":null,"abstract":"<p><p>Settlement, the transition from planktonic life to sedentary life, is a critical phase in the life cycle of corals, and is an important factor for population dynamics influencing new recruitment. However, previous studies on coral metamorphosis and settlement have overlooked actual processes from swimming to settlement on substrates. In this study, we discovered unique behavior of planula larvae of the coral <i>Acropora</i> that led to settlement on substrates covered by biofilms and we thus termed \"pre-settling behavior\". Pre-settling behavior consisted of three distinct steps in the sequence: (1) random crawling, (2) circular crawling, and (3) upright pausing. These steps were thought to correspond to the search for, evaluation of, and confirmation of appropriate settlement positions, respectively. Crawling speed and trajectories were analyzed, and their features are described. Since settlement occurs as adhesion of the aboral side to the substrate, it is conceivable that upright pausing is essential for metamorphosis to settled polyps as normal development. Frequent abortion of pre-settling behavior at any step to return to free swimming provides a view of repeated trials to seek settlement positions. Circular crawling in the counterclockwise direction was performed by forward movement with body curvature which determined the circle's radius, together with clockwise body spinning without forming helical trajectories. This movement suggests that changes of body curvature positions are synchronized with spinning to produce smooth, circular trajectories. The discovery of pre-settling behavior may contribute to understanding of settlement mechanisms and to coral seedlings production by elevating the settlement efficiency.</p>","PeriodicalId":24040,"journal":{"name":"Zoological Science","volume":"43 4","pages":"333-340"},"PeriodicalIF":1.0,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148680177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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