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Prolonged larval development in anurans: Assessing the independence of somatic growth and gonadal differentiation in Odontophrynus cordobae (Odontophrynidae). 无尾动物的长时间幼虫发育：评估cordobae齿蟾（齿蟾科）体细胞生长和性腺分化的独立性。

IF 1.6

Zoology (Jena, Germany) Pub Date : 2026-10-19 DOI: 10.1016/j.zool.2026.126356

Javier Goldberg, Cirilo Obregón, Fausto Izquierdo, Fernando Carezzano, Silvia I Quinzio

{"title":"Prolonged larval development in anurans: Assessing the independence of somatic growth and gonadal differentiation in Odontophrynus cordobae (Odontophrynidae).","authors":"Javier Goldberg, Cirilo Obregón, Fausto Izquierdo, Fernando Carezzano, Silvia I Quinzio","doi":"10.1016/j.zool.2026.126356","DOIUrl":"https://doi.org/10.1016/j.zool.2026.126356","url":null,"abstract":"Prolonged larval development in anurans provides an opportunity to examine how different developmental systems are temporally coordinated during ontogeny. In this study, we investigated larval development, somatic growth, and gonadal differentiation in the frog Odontophrynus cordobae under natural conditions. Field sampling throughout the annual reproductive period revealed the coexistence of two larval cohorts spanning a broad range of Gosner stages, indicating extended larval persistence and overwintering. Developmental sequences suggest that larval development may last between seven and nine months in natural populations. Morphometric analyses demonstrated progressive increases in total length, snout-vent length, body height, tail height, and interorbital width during larval ontogeny, with tail resorption occurring abruptly at metamorphic climax. Ovaries differentiated earlier and more gradually than testes, with developmental midpoints occurring at Gosner stages 32-33 and 34-35, respectively. Despite this temporal offset in gonadal differentiation, males and females exhibited similar somatic growth trajectories and no detectable sexual size dimorphism during larval development. These results indicate that somatic growth and gonadal differentiation follow partially independent temporal trajectories in O. cordobae. More broadly, our findings support the view that metamorphosis in anurans does not represent a strictly synchronized developmental transition, but rather the integration of partially independent ontogenetic processes differing in timing and dynamics.","PeriodicalId":94382,"journal":{"name":"Zoology (Jena, Germany)","volume":"178-179 ","pages":"126356"},"PeriodicalIF":1.6,"publicationDate":"2026-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149225762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of estrogens on apoptosis in the pituitary of viscachas (Lagostomus maximus maximus). 雌激素对粘虫垂体凋亡的影响

Zoology (Jena, Germany) Pub Date : 2024-05-01 Epub Date: 2024-05-10 DOI: 10.1016/j.zool.2024.126171

Gabriela Judith Rosales, Verónica Palmira Filippa, Fabian Heber Mohamed

{"title":"Effect of estrogens on apoptosis in the pituitary of viscachas (Lagostomus maximus maximus).","authors":"Gabriela Judith Rosales, Verónica Palmira Filippa, Fabian Heber Mohamed","doi":"10.1016/j.zool.2024.126171","DOIUrl":"10.1016/j.zool.2024.126171","url":null,"abstract":"Estrogens, acting through their receptors (ERα and ERβ), regulate cell turnover in the pituitary gland, influencing cell proliferation and apoptosis across various species. However, their role in pituitary processes in seasonally reproducing animals remains poorly understood. This study aims to investigate the influence of estrogens, through the expression of their specific receptors, on the apoptosis of PD cells in relation to sexual maturity, the reproductive cycle, and pregnancy in a seasonal reproductive rodent (Lagostomus maximus maximus). ERα and caspase-3-cleaved (CASP3c) immunoreactive (-ir) cells were identified through immunohistochemistry. Apoptotic cells were detected using the TUNEL technique, with quantitative analysis facilitated by image analysis software, alongside measurement of serum estradiol levels using radioimmunoassay The immunostaining pattern for ERα included nuclear (ERαn) and cytoplasmic (ERαc) staining. In male viscachas, ERα expression significantly increases from immature to adult animals, correlating with the rise in serum estradiol levels and a decrease in the percentage of apoptotic cells. During the gonadal regression period in adult males, a decrease in the number of ER-ir cells and serum levels of estradiol corresponds with an increase in the number of apoptotic cells. In females, serum levels of estradiol peaked during mid-pregnancy, coinciding with a significant decrease in the number of apoptotic cells in the PD. Simultaneously, the percentage of ERαn-ir cells reaches its maximum value during late pregnancy, indicating the need to maintain the protective action of this gonadal hormone throughout the extensive pregnancy in these rodents. Regional ERα receptor expression and apoptotic cells appear to be associated with distinct PD cell populations and their hormonal responses. Finally, elevated estradiol levels coincide with diminished apoptotic cells in the male reproductive cycle and during pregnancy, suggesting an antiapoptotic role of estradiol in this species.","PeriodicalId":94382,"journal":{"name":"Zoology (Jena, Germany)","volume":"164 ","pages":"126171"},"PeriodicalIF":0.0,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140961431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0