South American Journal of Herpetology Impact Factor & Information

Publisher: Sociedade Brasileira de Herpetologia

Journal description

Current impact factor: 0.00

Impact Factor Rankings

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5-year impact 0.00
Cited half-life 0.00
Immediacy index 0.00
Eigenfactor 0.00
Article influence 0.00
Other titles South American journal of herpetology (Online)
ISSN 1808-9798
OCLC 81146246
Material type Document, Periodical, Internet resource
Document type Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Segregation of habitat resources is an important mechanism that allows the coexistence of species. The diet is an important and dynamic component that can generate interactions among co-existing species. Differences in food resource use between related sympatric species have been associated frequently with divergence in multiple phenotypic traits; hence, it is interesting to explore how phenotypic differences allow sympatric species to minimize niche overlap. We aimed to evaluate trophic niche segregation between Tupinambis merianae and T. rufescens in relation to life history traits in a sympatric zone. We compared the volume of the stomach food items between species considering sexual dimorphism, body size classes, sexual maturity and reproductive activity. The obtained Morisita's index indicated trophic niche overlap between T. merianae and T. rufescens; however, considering particular food items, we observed differences in diet composition. Moreover, our results indicate that body size, sexual maturity and reproductive activity are relevant factors influencing the diet of these species. Life history traits of these two species of Tupinambis are important because they shape diet composition, contributing to interspecific segregation of the trophic niche and, therefore, allowing species coexistence.
    South American Journal of Herpetology 08/2015; 10(2):132-142. DOI:10.2994/SAJH-D-15-00002.1
  • South American Journal of Herpetology 08/2015; 10(2):116-120. DOI:10.2994/SAJH-D-14-00041.1
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    ABSTRACT: Studying the mating system of wild populations of American crocodiles, Crocodylus acutus, has important conservation implications. We conducted a preliminary analysis of the mating system of C. acutus in Las Baulas (2007 and 2008), Santa Rosa (2007) and Palo Verde (2008 and 2009) National Parks in Guanacaste, Costa Rica. We captured hatchlings during crocodile surveys and analyzed them with nine polymorphic microsatellite loci to determine relatedness values. High relatedness values indicated that full and half siblings were sampled in a single locality and season. We found full siblings between the years that hatchlings were collected in Las Baulas and Palo Verde National Parks, which suggested mate fidelity. The mate fidelity and high relatedness values could be a consequence of the smaller number of adult crocodiles found within these areas or indicative of a small number of dominant males in the populations. Our results support the need to conduct future studies describing the mating system and nesting success within populations of C. acutus. Understanding of these population factors is crucial to the continued success and maintenance of viable populations of C. acutus.
    South American Journal of Herpetology 04/2015; 10(1):4-9. DOI:10.2994/SAJH-D-14-00022.1
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    ABSTRACT: Male intromittent organs serve two primary reproductive functions: the physical entry into the female body during copulation and the effective delivery of gametes resulting in internal fertilization. Here we present a histological examination of the adult male American alligator phallus semen delivery apparatus, the sulcus spermaticus. While the highly collagenous basal crurae and more distal shaft of the alligator penis contain the rigid structures that facilitate cloacal intromission, the sulcus is more functionally intricate. Here we show the sulcus spermaticus (an open groove that runs along the ventral aspect of the phallic shaft) to be a spatially heterogeneous reproductive structure containing a complex architecture of multiple tissue types. Sulcus morphology markedly changes from its proximal origin between the crurae to its distal exit from the phallus tip. At the proximal origin of the sulcus, the ductus deferens vent semen into an expanded lumen lined by a convoluted secretory epithelium. Along the length of the phallic shaft, an arrangement of longitudinally and radially oriented smooth muscle bundles may act via rhythmic contractions to produce peristaltic sperm conveyance through the sulcus. An extensive vascular network of blood and lymph vessels putatively engorges the sulcus tissues during reproductive activity, increasing tension on an internal network of connective tissues and leading to localized inflation and increased tissue rigidity. We hypothesize that this engorgement works to seal the sulcus groove and allow the structure to convey semen through a functionally closed tube. Further, numerous epithelial secretory cells contribute seminal fluids to the ejaculate and may aid in as yet uncharacterized aspects of sulcus functioning. Together, these observations establish that the sulcus spermaticus is far more than a simple furrow in the phallus shaft for sperm conduction: it contains elements that form a complex functional gamete delivery system.
    South American Journal of Herpetology 04/2015; 10(1):32-40. DOI:10.2994/SAJH-D-14-00037.1
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    ABSTRACT: A new salamander of the genus Chiropterotriton is described from the Sierra Madre Oriental in southwestern Tamaulipas, Mexico. This genus is widespread in the Sierra Madre Oriental, its range extending from Tamaulipas to northern Oaxaca, and it occurs into central Mexico along the mountains associated with the Transverse Volcanic Axis. The species described herein is one of the northernmost species. Previously a few species of Chiropterotriton have been reported from the mountains of Tamaulipas and adjacent Nuevo León, but this new salamander is easily distinguished by its enlarged nares. It also differs from all congeners by a combination of characters including size, limb length, hand and foot morphology, color pattern, and dental morphology.
    South American Journal of Herpetology 12/2014; 9(3):228-234. DOI:10.2994/SAJH-D-14-00042.1
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    ABSTRACT: The anole lizards represent a conspicuous group of vertebrates due to their high species number and abundance in different habitats. Despite the high richness of anoles in Mexico (48 species), to date only a few studies have been performed on their ecology. Because different groups of parasites can provide ecological information on their hosts, we studied the helminths parasitizing Anolis uniformis, one of the most common anoles from southern Mexico. We examined individuals from the tropical rainforest in Laguna Escondida, Los Tuxtlas, Veracruz and we found eight parasitic taxa: seven nematodes (Acuariidae gen. sp., Aplectana sp., Oswaldocruzia sp., Physocephalus sp., Piratuba sp., Rhabdias tobagoensis, and Strongyluris panamaensis) and one acanthocephalan (Centrorhynchus sp.). All taxa represent new records for the host. Additionally, the genera Centrorhynchus, Oswaldocruzia, Physocephalus and Strongyluris are new records for Mexican anoles, while the genus Aplectana is a new record for all anoles. At the genus level, the taxonomical composition of the helminth fauna of A. uniformis is similar to that reported for Central and South American anoles. The life cycles of the parasites found suggest that these lizards may acquire most nematodes from the forest floor while hiding. Life cycles also support that A. uniformis has a mainly insectivorous diet and reflect the presence of mosquitoes that transmit microfilariae to the lizards when feed on their blood.
    South American Journal of Herpetology 12/2014; 9(3):183-189. DOI:10.2994/SAJH-D-14-00035.1