Atividade reprodutiva de Physalaemus signifer (Anura, Leptodactylidae) em ambiente temporário

Wogel, Henrique; Abrunhosa, Patrícia A.; Pombal, José P.

doi:10.1590/s0073-47212002000200006

Cited by 31 publications

(35 citation statements)

References 34 publications

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“…So, we can not conclude that toe clipping had some influence on the results. Males of S. centralis showed site fidelity and defended their territories with postures, vocalizations and fights, indicating that the agonistic interactions presented an increasing escalated aggressiveness, this being a similar system found in other species (DYSON AND PASSMORE, 1992a;POMBAL et al, 1994, MARTINS et al, 1998WOGEL et al, 2002).…”

Section: Discussionsupporting

confidence: 56%

“…In the breeding aggregations, the number of males was greater than that of females, arising low nightly estimates of OSRs (40 males:1 female), as registered in many prolonged breeders (BASTOS & HADDAD, 1996;1999;DYSON et al, 1992;WOGEL et al, 2002). Low OSR can explain the small number of males (N=11) encountered in amplexus, because malemale competition (intrasexual competition) is very intense.…”

Section: Discussionmentioning

confidence: 92%

“…In other anuran species, when aggressive interactions escalate to physical combats, size (HOWARD, 1978, ROBERTSON, 1986, residence (FELLERS, 1979;WOGEL et al, 2002), or both (WELLS, 1978BASTOS & HADDAD, 2002) are the main determinant of the result. For S. centralis, it is possible that residence was a decisive factor, because the winners of agonistic interactions were always the residents.…”

Section: Discussionmentioning

confidence: 99%

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Breeding activity of Scinax centralis (Anura, Hylidae) in Central Brazil

Alcantara¹,

Lima

2007

Iheringia, Sér. Zool.

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ABSTRACT. From January, 1997 to April, 1998, we studied breeding activity in a population of Scinax centralis Pombal & Bastos, 1996, in the state of Goiás, inside the Cerrado Biome, Brazil. The behavior of males and females in the choruses, the relationships between environmental variables and the presence of individuals, the spatial distribution pattern, amplexus and clutches were analyzed. The breeding season occurred from November to May. The majority of males began to call when they entered the chorus; they were defending their calling sites against other males. We found a positive correlation between the number of females and males in the choruses, but no significant correlation was observed between the operational sexual ratio (OSR, number of reproducing females/number of reproducing males) and the number of calling males. OSR was highly male-biased; on average, there were 40 males for each female. The presence of individuals was positively correlated with air temperature of two previous days and negatively correlated with rainfall on the observation day. Generally, males were non-randomly distributed and satellite males were observed. Females were larger and heavier than males. Egg number, but not diameter of the egg, was correlated with the female size.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Breeding activity of Scinax centralis (Anura, Hylidae) in Central Brazil

Alcantara¹,

Lima

2007

Iheringia, Sér. Zool.

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“…São poucos os trabalhos baseados em questões da biologia reprodutiva para os gêneros que compõem a família Leiuperidae como as contribuições para algumas espécies do gênero Physalaemus (Fitzinger, 1826) (RYAN et al, 1983;RYAN, 1990;BARRETO & ANDRADE, 1995;WOGEL et al, 2002) e do gênero Eupemphix (Steindachner, 1863) (OLIVEIRA & ZIERI, 2005). Alguns destes estudos se referem aos aspectos morfológicos do aparelho reprodutor masculino de Physalaemus cuvieri (Fitzinger, 1826) (OLIVEIRA et al, 2002(OLIVEIRA et al, , 2003b) e à caracterização estrutural de espermatozóides de P. biligonigerus (Cope, 1861), P. fuscomaculatus (Steindachner, 1864) e P. centralis (Bokermann, 1962) (AMARAL et al, 1999).…”

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Espermiogênese em Eupemphix nattereri (Anura, Leiuperidae): aspectos ultra-estruturais

Zieri

Taboga

Oliveira

2008

Iheringia, Sér. Zool.

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ABSTRACT. Spermiogenesis in Eupemphix nattereri (Anura, Leiuperidae): ultrastructural aspects. Spermatozoon maturation involves an extense and complex process beginning with proliferation and differentiation of spermatogonia, passing through meiosis, and ending with spermiogenesis. The later event involves morphological and biochemical changes in order to transform spermatids into spermatozoa. Ultrastructural aspects of the spermiogenesis and testicular spermatozoa of the anuran Eupemphix nattereri (Steindachner, 1863) were analyzed by transmission electron microscopy. Spermiogenesis involves chromatin condensation and nuclear elongation, with visible cytoplasmic elimination. At this stage, a large amount of microtubules and glycogen can also be seen in Sertoli cell cytoplasm, surrounding each spermatid. The spermatozoon is fusiform and the acrossome forms a cap in the anterior region of the nucleus. A mitochondrial sleeve is found around the proximal portion of the tail. The tail presents an axonema with a 9+2 pattern, a justaxonemal fiber, an undulating membrane, and the absence of axial rod. This organization shows some similarities with species of the genus Physalaemus (Leiuperidae) such as P. biligonigerus (Cope, 1861), P. gracilis (Boulenger, 1883) and P. fuscomaculatus (Steindachner, 1864).KEYWORDS. Anura, Eupemphix nattereri, ultrastructure, spermiogenesis, spermatozoon. RESUMO.A maturação dos espermatozóides envolve um extenso e complexo processo que começa com a proliferação e diferenciação das espermatogônias, passa pela meiose e finaliza com a espermiogênese. Nessa fase, eventos envolvendo alterações morfológicas e bioquímicas transformam espermátides em espermatozóides. Aspectos ultra-estruturais da espermiogênese e do espermatozóide do anuro Eupemphix nattereri (Steindachner, 1863) foram analisados através de microscopia eletrônica de transmissão. A espermiogênese envolve condensação da cromatina e alongamento nuclear, com visível eliminação de citoplasma. Nesse estágio, grande quantidade de microtúbulos e glicogênio podem ser visualizados no citoplasma das células de Sertoli, rodeando cada espermátide. O espermatozóide é fusiforme e o acrossomo forma uma capa na região anterior do núcleo. A bainha mitocondrial é encontrada ao redor da porção proximal da cauda. A cauda apresenta o axonema com o modelo 9+2, uma fibra axonemal, a membrana ondulante e ausência de bastão axial. Esta organização apresenta algumas similaridades com espécies do gênero Physalaemus (Leiuperidae) como P. biligonigerus (Cope, 1861), P. gracilis (Boulenger, 1883) e P. fuscomaculatus (Steindachner, 1864).

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“…This is the case for several species of amphibians (EMLEN & ORING 1977, BASTOS & HADDAD 1999, PROHL & HÖDL 1999, PROHL 2002, WOGEL et al 2002, SILVA & ROSSA-FERES 2010. The operational sex ratio found in this population of P. bolbodactyla was biased towards a larger number of males, with an average of 2.6:1 males/female.…”

Section: Discussionmentioning

confidence: 92%