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Hernández M, Hereira-Pacheco S, Alberdi A, Díaz DE LA Vega-Pérez AH, Estrada-Torres A, Ancona S, Navarro-Noya YE. DNA metabarcoding reveals seasonal changes in diet composition across four arthropod-eating lizard species (Phrynosomatidae: Sceloporus). Integr Zool 2024; 19:480-495. [PMID: 37550887 DOI: 10.1111/1749-4877.12755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Diet composition and its ecological drivers are rarely investigated in coexisting closely related species. We used a molecular approach to characterize the seasonal variation in diet composition in four spiny lizard species inhabiting a mountainous ecosystem. DNA metabarcoding revealed that the lizards Sceloporus aeneus, S. bicanthalis, S. grammicus, and S. spinosus mostly consumed arthropods of the orders Hemiptera, Araneae, Hymenoptera, and Coleoptera. The terrestrial lizards S. aeneus and S. bicanthalis mostly predated ants and spiders, whereas the arboreal-saxicolous S. grammicus and saxicolous S. spinosus largely consumed grasshoppers and leafhoppers. The taxonomic and phylogenetic diversity of the prey was higher during the dry season than the rainy season, likely because reduced prey availability in the dry season forced lizards to diversify their diets to meet their nutritional demands. Dietary and phylogenetic composition varied seasonally depending on the species, but only dietary composition varied with altitude. Seasonal dietary turnover was greater in S. spinosus than in S. bicanthalis, suggesting site-specific seasonal variability in prey availability; no other differences among species were observed. S. bicanthalis, which lives at the highest altitude in our study site, displayed interseasonal variation in diet breadth. Dietary differences were correlated with the species' feeding strategies and elevational distribution, which likely contributed to the coexistence of these lizard species in the studied geographic area and beyond.
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Affiliation(s)
- Mauricio Hernández
- Doctorado en Ciencias Biológicas, Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala, Mexico
| | - Stephanie Hereira-Pacheco
- Estación Científica La Malinche, Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala, Mexico
| | - Antton Alberdi
- Center for Evolutionary Hologenomics, The Globe Institute, University of Copenhagen, Copenhagen, Denmark
| | - Aníbal H Díaz DE LA Vega-Pérez
- Consejo Nacional de Ciencia y Tecnología-Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala, Mexico
| | - Arturo Estrada-Torres
- Estación Científica La Malinche, Centro Tlaxcala de Biología de la Conducta, Universidad Autónoma de Tlaxcala, Tlaxcala, Mexico
| | - Sergio Ancona
- Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Yendi E Navarro-Noya
- Laboratorio de Interacciones Bióticas, Centro de Investigación en Ciencias Biológicas, Universidad Autónoma de Tlaxcala, San Felipe Ixtacuixtla, Tlaxcala, Mexico
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Rivera-López JR, Torres-Martínez A, Hernández-Franyutti AA, Uribe MC, Gribbins K. The male reproductive cycle of the brown basilisk Basiliscus vittatus (Squamata: Corytophanidae) from Tabasco, Southern Mexico. J Morphol 2024; 285:e21694. [PMID: 38619230 DOI: 10.1002/jmor.21694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 03/23/2024] [Accepted: 03/30/2024] [Indexed: 04/16/2024]
Abstract
We used histological and morphometric methods to study the testis and associated glands, including the epididymis, ductus deferens, and renal sexual segment (RSS), of specimens of Basiliscus vittatus sampled from Tabasco, Mexico (17.5926° N, 92.5816° W). Samples were collected throughout 1 year, which included the dry (February to May) and rainy (June to January) seasons. Spermatogenesis in B. vittatus is active throughout the year, but a significant increase in the testicular volume, diameters of seminiferous tubules, height of the germinal epithelium, spermiogenesis, and released spermatozoa occur in the dry season. During the rainy season, all aforementioned parameters decreased except the secretory activity of the epididymis and the RSS, which increased concomitant with an increase of the spermatozoa population within the ductus deferens. These data strongly suggest that B. vittatus reproduce year-round, but males exhibit a peak in spermatogenic activity during the dry season and a peak in insemination and/or copulation at the beginning of the rainy season. We highlight the importance of analyzing not only the testis but also accessory ducts and glands when determining the reproductive cycles of reptiles. The reproductive cycle of B. vittatus is discussed in relation to the environmental conditions of Southern Mexico and is compared to that of other squamates.
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Affiliation(s)
- José Rodrigo Rivera-López
- Laboratorio de Biología de la Reproducción Animal, División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Tabasco, Mexico
| | - Aarón Torres-Martínez
- Laboratorio de Biología de la Reproducción Animal, División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Tabasco, Mexico
- Department of Marine Biosciences, Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan
| | - Arlette Amalia Hernández-Franyutti
- Laboratorio de Biología de la Reproducción Animal, División Académica de Ciencias Biológicas, Universidad Juárez Autónoma de Tabasco, Tabasco, Mexico
| | - Mari Carmen Uribe
- Laboratorio de Biología de la Reproducción Animal, Departamento de Biología Comparada, Facultad de Ciencias, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Kevin Gribbins
- Department of Biology, University of Indianapolis, Indianapolis, Indiana, USA
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Galina‐Tessaro P, Álvarez‐Cárdenas S, Valdez‐Villavicencio JH, Villagrán‐SantaCruz M. Reproduction in
Sceloporus licki
(Reptilia: Phrynosomatidae) in the Cape Region, Baja California Sur. ACTA ZOOL-STOCKHOLM 2020. [DOI: 10.1111/azo.12342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | | | | | - Maricela Villagrán‐SantaCruz
- Laboratorio de Biología Tisular y Reproductora Departamento de Biología Comparada Facultad de Ciencias Universidad Nacional Autónoma de México Ciudad de México México
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Peña‐Herrera E, Villagrán‐SantaCruz M, Hernández‐Gallegos O, Rheubert JL, Gribbins KM, Granados‐González G. Reproductive activity in males of
Sceloporus variabilis
: Little time to rest, long time to breed. ACTA ZOOL-STOCKHOLM 2018. [DOI: 10.1111/azo.12275] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eric Peña‐Herrera
- Laboratorio de Morfofisiología de la Reproducción, Facultad de Ciencias Universidad Autónoma del Estado de México Toluca Estado de México México
| | - Maricela Villagrán‐SantaCruz
- Laboratorio de Biología Tisular y Reproductora, Departamento de Biología Comparada, Facultad de Ciencias Universidad Nacional Autónoma de México Ciudad de México México
| | - Oswaldo Hernández‐Gallegos
- Laboratorio de Herpetología, Facultad de Ciencias Universidad Autónoma del Estado de México Toluca Estado de México México
| | | | - Kevin M. Gribbins
- Department of Biology University of Indianapolis Indianapolis Indiana
| | - Gisela Granados‐González
- Laboratorio de Morfofisiología de la Reproducción, Facultad de Ciencias Universidad Autónoma del Estado de México Toluca Estado de México México
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Pewhom A, Srakaew N. Microanatomy of the testes and testicular ducts of the butterfly lizard,
Leiolepis ocellata
Peters, 1971 (Reptilia: Squamata: Agamidae) during the active reproductive period. ACTA ZOOL-STOCKHOLM 2018. [DOI: 10.1111/azo.12270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Akkanee Pewhom
- Department of Zoology, Faculty of Science Kasetsart University Bangkok Thailand
| | - Nopparat Srakaew
- Department of Zoology, Faculty of Science Kasetsart University Bangkok Thailand
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Hernández‐Gallegos O, Granados‐González G, Rheubert JL, Villagrán‐SantaCruz M, Peña‐Herrera E, Gribbins KM. Lack of spermatogenic variation in a polymorphic lizard,
Sceloporus aeneus
(Squamata: Phrynosomatidae). ACTA ZOOL-STOCKHOLM 2018. [DOI: 10.1111/azo.12258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Oswaldo Hernández‐Gallegos
- Facultad de CienciasLaboratorio de HerpetologíaInstituto Literario # 100Universidad Autónoma del Estado de México Toluca México
| | - Gisela Granados‐González
- Facultad de CienciasLaboratorio de Morfofisiología de la ReproducciónInstituto Literario # 100Universidad Autónoma del Estado de México Toluca México
| | | | - Maricela Villagrán‐SantaCruz
- Facultad de CienciasDepartamento de Biología ComparadaLaboratorio de Biología Tisular y ReproductoraUniversidad Nacional Autónoma de México Ciudad de México México
| | - Eric Peña‐Herrera
- Facultad de CienciasLaboratorio de Morfofisiología de la ReproducciónInstituto Literario # 100Universidad Autónoma del Estado de México Toluca México
| | - Kevin M. Gribbins
- Department of BiologyUniversity of Indianapolis Indianapolis Indiana
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Granados-González G, Villagrán-SantaCruz M, Peña-Herrera E, Rheubert JL, Gribbins KM, Hernández-Gallegos O. Spermatogenesis in Sceloporus variabilis
(Squamata, Phrynosomatidae): A non-quiescent pattern. ACTA ZOOL-STOCKHOLM 2017. [DOI: 10.1111/azo.12229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gisela Granados-González
- Laboratorio de Morfofisiología de la Reproducción; Facultad de Ciencias; Universidad Autónoma del Estado de México; Toluca México
| | - Maricela Villagrán-SantaCruz
- Laboratorio de Biología Tisular y Reproductora; Departamento de Biología Comparada; Facultad de Ciencias; Universidad Nacional Autónoma de México; Ciudad de México México
| | - Eric Peña-Herrera
- Laboratorio de Morfofisiología de la Reproducción; Facultad de Ciencias; Universidad Autónoma del Estado de México; Toluca México
| | | | - Kevin M. Gribbins
- Department of Biology; University of Indianapolis; Indianapolis IN USA
| | - Oswaldo Hernández-Gallegos
- Laboratorio de Herpetología; Facultad de Ciencias; Universidad Autónoma del Estado de México; Toluca México
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Villagrán-SantaCruz M, Mendoza-Cruz E, Granados-González G, Rheubert JL, Hernández-Gallegos O. Sperm storage in the viviparous lizard Sceloporus bicanthalis (Squamata: Phrynosomatidae), a species with continuous spermatogenesis. ZOOMORPHOLOGY 2016. [DOI: 10.1007/s00435-016-0327-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hernández-Gallegos O, Méndez-de la Cruz FR, Villagrán-SantaCruz M, Rheubert JL, Granados-González G, Gribbins KM. Seasonal spermatogenesis in the Mexican endemic oviparous lizard, Sceloporus aeneus (Squamata: Phrynosomatidae). SPERMATOGENESIS 2015; 4:e988585. [PMID: 26413407 DOI: 10.4161/21565562.2014.988585] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/10/2014] [Accepted: 11/13/2014] [Indexed: 11/19/2022]
Abstract
Oviparous species of Sceloporus exhibit either seasonal or continuous spermatogenesis and populations from high-elevation show a seasonal pattern known as spring reproductive activity. We studied the spermatogenic cycle of a high-elevation (2700 m) population of endemic oviparous lizard, Sceloporus aeneus, that resided south of México, D.F. Histological analyses were performed on the testes and reproductive ducts from individual lizards collected monthly. This population of S. aeneus showed a seasonal pattern of spermatogenesis, with 4 successive phases common in other lizards. These include: 1) Quiescence in August, which contained solely spermatogonia and Sertoli cells; 2) Testicular recrudescence (September-January) when testes became active with mitotic spermatogonia, spermatocytes beginning meiosis, and the early stages of spermiogenesis with spermatids; 3) Maximum testicular activity occurred from March to May and is when the largest spermiation events ensued within the germinal epithelia, which were also dominated by spermatids and spermiogenic cells; 4) Testicular regression in June was marked with the number of all germs cells decreasing rapidly and spermatogonia dominated the seminiferous epithelium. February was a transitional month between recrudescence and maximum activity. The highest sperm abundance in the lumina of epididymides was during maximum testicular activity (March-May). Thus, before and after these months fewer spermatozoa were detected within the excurrent ducts as the testis transitions from recrudescence to maximum activity in February and from maximum activity to quiescence in June. Maximum spermatogenic activity corresponds with warmest temperatures at this study site. This pattern known as spring reproductive activity with a fall recrudescence was similar to other oviparous species of genus Sceloporus.
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Affiliation(s)
- Oswaldo Hernández-Gallegos
- Facultad de Ciencias; Universidad Autónoma del Estado de México ; Toluca, Estado de México, México ; Departamento de Zoología; Instituto de Biología; Universidad Nacional Autónoma de México ; Distrito Federal, México
| | | | - Maricela Villagrán-SantaCruz
- Laboratorio de Biología Tisular y Reproductora; Departamento de Biología Comparada; Facultad de Ciencias ; Universidad Nacional Autónoma de México ; Distrito Federal, México
| | | | - Gisela Granados-González
- Facultad de Ciencias; Universidad Autónoma del Estado de México ; Toluca, Estado de México, México
| | - Kevin M Gribbins
- Biology Department; University of Indianapolis ; Indianapolis, IN USA
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Seasonal and continuous spermatogenesis in the viviparous lizard Sceloporus grammicus, a study of two populations in contrasting environments from the Central Mexican Plateau. ZOOL ANZ 2015. [DOI: 10.1016/j.jcz.2014.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Reproductive Biology ofSceloporus consobrinus(Phrynosomatidae): Male Germ Cell Development and Reproductive Cycle Comparisons within Spiny Lizards. J HERPETOL 2014. [DOI: 10.1670/12-156] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Granados-González G, Rheubert JL, Villagrán-SantaCruz M, González-Herrera ME, Dávila-Cedillo JV, Gribbins KM, Hernández-Gallegos O. Male reproductive cycle inAspidoscelis costata costata(Squamata: Teiidae) from Tonatico, Estado de México, México. ACTA ZOOL-STOCKHOLM 2013. [DOI: 10.1111/azo.12057] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gisela Granados-González
- Facultad de Ciencias; Universidad Autónoma del Estado de México; Instituto Literario 100 Toluca Centro C.P. 50000 México
| | - Justin L. Rheubert
- Department of Biology; Saint Louis University; 3507 Laclede Ave St. Louis MO 63103 USA
| | - Maricela Villagrán-SantaCruz
- Laboratorio de Biología de la Reproducción Animal; Departamento de Biología Comparada; Facultad de Ciencias; Universidad Nacional Autónoma de México; Distrito Federal C.P. 04510 México
| | - María E. González-Herrera
- Facultad de Ciencias; Universidad Autónoma del Estado de México; Instituto Literario 100 Toluca Centro C.P. 50000 México
| | - Jessica V. Dávila-Cedillo
- Facultad de Ciencias; Universidad Autónoma del Estado de México; Instituto Literario 100 Toluca Centro C.P. 50000 México
| | - Kevin M. Gribbins
- Department of Biology; Wittenberg University; P.O. Box 720 Springfield OH 45501 USA
| | - Oswaldo Hernández-Gallegos
- Facultad de Ciencias; Universidad Autónoma del Estado de México; Instituto Literario 100 Toluca Centro C.P. 50000 México
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Gribbins KM, Matchett CL, DelBello KA, Rheubert J, Villagrán-SantaCruz M, Granados-González G, Hernández-Gallegos O. The ultrastructure of spermatid development during spermiogenesis within the rosebelly lizard, Sceloporus variabilis (Reptilia, Squamata, Phrynosomatidae). J Morphol 2013; 275:258-68. [PMID: 24186265 DOI: 10.1002/jmor.20212] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 09/06/2013] [Accepted: 09/10/2013] [Indexed: 11/05/2022]
Abstract
Several recent studies have mapped out the characters of spermiogenesis within several species of squamates. Many of these data have shown both conserved and possibly apomorphic morphological traits that could be important in future phylogenetic analysis within Reptilia. There, however, has not been a recent study that compares spermiogenesis and its similarities or differences between two species of reptile that reside in the same genus. Thus, the present analysis details the changes to spermiogenesis in Sceloporus variabilis and then compares spermatid morphologies to that of Sceloporus bicanthalis. Many of the morphological changes that the spermatids undergo in these two species are similar or conserved, which is similar to what has been reported in other squamates. There are six main character differences that can be observed during the development of the spermatids between these two sceloporid lizards. They include the presence (S. variabilis) or absence (S. bicanthalis) of a mitochondrial/endoplasmic reticulum complex near the Golgi apparatus during acrosome development, a shallow (S. variabilis) or deep (S. bicanthalis) nuclear indentation that accommodates the acrosomal vesicle, filamentous (S. variabilis) or granular (S. bicanthalis) chromatin condensation, no spiraling (S. variabilis) or spiraling (S. bicanthalis) of chromatin during condensation, absence (S. variabilis) or presence (S. bicanthalis) of the longitudinal manchette microtubules, and the lack of (S. variabilis) or presence (S. bicanthalis) of nuclear lacunae. This is the first study that compares spermiogenic ultrastructural characters between species within the same genus. The significance of the six character differences between two distantly related species within Sceloporus is still unknown, but these data do suggest that spermiogenesis might be a good model to study the hypothesis that spermatid ontogeny is species specific.
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Affiliation(s)
- Kevin M Gribbins
- Department of Biology, Wittenberg University, Springfield, Ohio, 45501
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Al-Amri IS, Mahmoud IY, Waring CP, Alkindi AY, Khan T, Bakheit C, Al-Mawali KM. The reproductive cycle of the male house gecko, Hemidactylus flaviviridis, in relation to plasma steroid concentrations, progesterone receptors, and steroidogenic ultrastructural features, in Oman. Gen Comp Endocrinol 2013; 187:23-31. [PMID: 23524273 DOI: 10.1016/j.ygcen.2013.02.040] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 01/24/2013] [Accepted: 02/23/2013] [Indexed: 11/17/2022]
Abstract
The annual testicular cycle of the house gecko Hemidactylus flaviviridis in Oman was studied. Plasma testosterone (T), estradiol (E2) and progesterone (P) concentrations were measured using a sensitive HPLC-MS/MS detection technique. The ultrastructural steroidogenic features in Sertoli and Leydig cells, which were the major source of steriodogenesis, were examined, using transmission electron microscopy (TEM). In addition, progesterone receptors (PR) were examined throughout the testicular cycle, using an immunohistochemical technique. The steroidogenic ultrastructural features were characterized by the presence of smooth endoplasmic reticulum (SER) in the form of cisternal whorls and tubular cisternae, presence of swollen vesiculated mitochondria, and association between SER, mitochondria and lipid droplets. The rise in plasma steroid concentrations was closely associated with the development of the ultrastructural features and PR expression in Leydig and Sertoli cells. During the active phase (November-May), there was a significant rise in plasma steroid concentrations (P<0.05) related to well developed steroidogenic features and strongly expressed PR. During the quiescent phase (June-August) there was a significant decline in plasma steroid concentrations, undeveloped steroiodogenic features and weakly expressed PR. The Renal Sexual Segment (RSS) was fully developed during the active phase. The data provides strong evidence that these ultrastructural steroidogenic features were related to the plasma sex steroid concentrations during the testicular cycle.
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Affiliation(s)
- Issa S Al-Amri
- Department of Biological Sciences and Chemistry, University of Nizwa, Nizwa, Oman.
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Rheubert J, Touzinsky K, Hernández-Gallegos O, Granados-González G, Gribbins K. Ontogenic development of spermatids during spermiogenesis in the high altitude bunchgrass lizard (Sceloporus bicanthalis). SPERMATOGENESIS 2012; 2:94-103. [PMID: 22670219 PMCID: PMC3364797 DOI: 10.4161/spmg.20410] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The body of ultrastructural data on spermatid characters during spermiogenesis continues to grow in reptiles, but is still relatively limited within the squamates. This study focuses on the ontogenic events of spermiogenesis within a viviparous and continually spermatogenic lizard, from high altitude in Mexico. Between the months of June and August, testicular tissues were collected from eight spermatogenically active bunchgrass lizards (Sceloporus bicanthalis) from Nevado de Toluca, México. The testicular tissues were processed for transmission electron microscopy and analyzed to access the ultrastructural differences between spermatid generations during spermiogenesis. Interestingly, few differences exist between S. bicanthalis spermiogenesis when compared with what has been described for other saurian squamates. Degrading and coiling membrane structures similar to myelin figures were visible within the developing acrosome that are likely remnants from Golgi body vesicles. During spermiogenesis, an electron lucent area between the subacrosomal space and the acrosomal medulla was observed, which has been observed in other squamates but not accurately described. Thus, we elect to term this region the acrosomal lucent ridge. This study furthers the existing knowledge of spermatid development in squamates, which could be useful in future work on the reproductive systems in high altitude viviparous lizard species.
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Gribbins KM. Reptilian spermatogenesis: A histological and ultrastructural perspective. SPERMATOGENESIS 2011; 1:250-269. [PMID: 22319673 PMCID: PMC3271667 DOI: 10.4161/spmg.1.3.18092] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 09/09/2011] [Accepted: 09/10/2011] [Indexed: 12/14/2022]
Abstract
Until recently, the histology and ultrastructural events of spermatogenesis in reptiles were relatively unknown. Most of the available morphological information focuses on specific stages of spermatogenesis, spermiogenesis, and/or of the mature spermatozoa. No study to date has provided complete ultrastructural information on the early events of spermatogenesis, proliferation and meiosis in class Reptilia. Furthermore, no comprehensive data set exists that describes the ultrastructure of the entire ontogenic progression of germ cells through the phases of reptilian spermatogenesis (mitosis, meiosis and spermiogenesis). The purpose of this review is to provide an ultrastructural and histological atlas of spermatogenesis in reptiles. The morphological details provided here are the first of their kind and can hopefully provide histological information on spermatogenesis that can be compared to that already known for anamniotes (fish and amphibians), birds and mammals. The data supplied in this review will provide a basic model that can be utilized for the study of sperm development in other reptiles. The use of such an atlas will hopefully stimulate more interest in collecting histological and ultrastructural data sets on spermatogenesis that may play important roles in future nontraditional phylogenetic analyses and histopathological studies in reptiles.
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Affiliation(s)
- Kevin M Gribbins
- Department of Biology; Wittenberg University; Springfield, OH USA
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