Predatory combat and tail wrestling in hierarchical contests of the Neotropical rattlesnake Crotalus durissus terrificus (Serpentes: Viperidae)

Almeida‐Santos, Selma Maria; Peneti, Elaine Aparecida; Salomão, Maria da Graça; Guimaraes, Eduardo Santos; Sena, Paulo Sergio de

doi:10.1163/156853899x00105

Cited by 16 publications

(14 citation statements)

References 19 publications

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“…Para as análises relacionadas aos índices hepatossomático, lipossomático, lipídeos e proteínas totais do fígado foram levados em consideração a bienalidade do ciclo reprodutivo das fêmeas e o ciclo anual dos machos (ALMEIDA-SANTOS et al, 2004;ALMEIDA-SANTOS, 2005 Legenda -A) Vitelogênese primária (folículos ovarianos <10mm); B) vitelogênese secundária (folículos ovarianos >10mm); C) Prenhez em estágio intermediário de desenvolvimento embrionário; D) Prenhez em estágio avançado de desenvolvimento embrionário. Legenda -A = primavera, início do crescimento do epitélio germinativo nos túbulos seminíferos, oberva-se presença de espermatócitos e espermatogônias; B=verão, pico da atividade testicularobserva-se lúmem preenchido por espermátides e espermatozoides totalmente formados; C=outono, início do processo de regressão, com diminuição do epitélio germinativo dos túbulos seminíferos; D=inverno, regressão total do epitélio do epitélio germinativo dos túbulos seminíferos e aumento acentuado do lúmem.…”

Section: Resultsunclassified

“…Dada a sazonalidade marcante relatada para o período de cópula e para as modificações fisiológicas descritas entre as Crotalus neotropicais (ALMEIDA-SANTOS; ORSI, 2002;ALMEIDA-SANTOS et al, 2004;ALMEIDA-SANTOS, 2005;PUORTO et al, 1995) DENARDO;TAYLOR, 2011;DUVALL et al, 1992;KING;DUVALL, 1990;SCHUETT, 1992).…”

Section: Discussionunclassified

“…A hipertrofia do segmento sexual renal (SSR) geralmente está associada com secreção andrógena e o processo da espermatogênese (BISHOP, 1959;KROMER, 2004;SANYAL;PRASAD, 1966;WEIL, 1984) de forma a ser considerada essencial para a atividade de acasalamento. Em função disso, Schuett et al 2002 , 1997;ALMEIDA-SANTOS et al, 2004;FOX, 1977;MARINHO et al, 2008) Além disso, a hipertrofia do SSR estaria de alguma forma relacionada com os comportamentos sexuais tais como combate, corte e guarda copulatória. (ALMEIDA-SANTOS et al, 1999 DUVALL, 1992).…”

Section: Fígado -Lipídeos Proteínas E Alterações Histológicasunclassified

“…Em função disso, Schuett et al 2002 , 1997;ALMEIDA-SANTOS et al, 2004;FOX, 1977;MARINHO et al, 2008) Além disso, a hipertrofia do SSR estaria de alguma forma relacionada com os comportamentos sexuais tais como combate, corte e guarda copulatória. (ALMEIDA-SANTOS et al, 1999 DUVALL, 1992). As alterações comportamentais exigidas ao longo dos processos reprodutivoscomo a procura prolongada pelas fêmeas e a separação sazonal entre a ovulação/fertilização e a cópula, podem revelar padrões de atividade diferenciados entre machos e fêmeas de acordo com as variações sazonais do repertório do sistema de acasalamento exercido pelas espécies (ALDRIDGE; BROWN, 1995;DUVALL, 2002;BAUENS;THOEN, 1981;BRODIE, 1989;MARQUES et al, 2001;MARQUES et al, 2006;.…”

Section: Fígado -Lipídeos Proteínas E Alterações Histológicasunclassified

“…A espécie Crotalus durissus neotropical apresentam-se como uma das espécies mais intensivamente estudas sob o contexto ecológico e da história natural, destacando-se como um potencial modelo para as interpretações evolutivas das estratégias reprodutivas (ALMEIDA-SANTOS et al, 2004;ALMEIDA-SANTOS, 2005;DUVALL, 1998). As fêmeas de Crotalus durissus reproduzem por viviparidade e apresentam um ciclo reprodutivo marcadamente sazonal, no qual o início da deposição de vitelo nos folículos ovarianos ocorre no fim do verão.…”

Section: Introductionunclassified

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Custos reprodutivos em Crotalus durissus (Serpentes, Viperidae) do Estado de São Paulo, Brasil.

Sueiro¹

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Reproduction is costly for both sexes, but the magnitude of spending and the relation to reproductive success differs substantially between males and females. Reproductive costs can be divided into two categories: costs associated with survival and energy costs. The costs associated with survival are those that affect the probability of survival of reproductive organisms. Costs associated with fertility influence the energy available for future reproductive event. Crotalus durissus has a seasonal reproductive cycle in which the beginning of the yolk deposition in ovarian follicles occur in the late summer, and mating occur in autumn, the sperm storage extends during winter the end of yolk deposition in ovarian follicles and fertilization occurs in spring. Finally, the birth is observed at the late summer. Males exhibit intraspecific competition evidenced in ritual combat with the purpose of access to receptive females release pheromones particles (vitellogenin) in the air. The inference of reproductive costs associated with survival was accomplished through surveys of activity rates between males and females, as na indicative of higher mortality risk. Females require a high energy investment to initiate the reproductive period. Lipids from the abdominal fat accumulates in the liver and are consumed during the cycle of ovarian follicles and this is the most costly phase of reproduction, when abdominal fat is shifted in yolk. The variation of the amount of abdominal fat and energetics substrates liver and kidneys were evaluated to measure the energy cost of reproduction in C. durissus. The results of this study shows that the reproductive strategies adopted by females Crotalus durissus require a high energy investment-evidenced by the higher levels of abdominal fat and lipids in the liver during vitellogenic phase, which are used to signal estrus in the reproductive season, ovulation and throughout pregnancy to nourish the embryos. Moreover, the pattern of activity differentiated between males and females reproductive tactics adopted by males during autumn, increase the rate of sighting, because during this season, the males perform a prolonged search by females, fighting and mating. For the pattern found in spring and summer, many females may be related to pregnancy and vitellogenic process, factors that increase body mass, and the thermoregulation rate, thus making them less able to escape predators, and then more sighted. During the winter, the result can be attributed to lower temperatures during this season, forcing males and females to remain in shelters to decrease moviments spending, given the ectothermic condition in reptiles.

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Section: Resultsunclassified

Section: Discussionunclassified

Section: Fígado -Lipídeos Proteínas E Alterações Histológicasunclassified

Section: Introductionunclassified

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Custos reprodutivos em Crotalus durissus (Serpentes, Viperidae) do Estado de São Paulo, Brasil.

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Ritualized male–male combat resulting from intraspecific food competition in three Agkistrodon species

Farrell,

Gull,

Boyce

et al. 2024

J Ethol

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The Implicit Rules of Combat

Romero

Pham

Goetz

2014

Hum Nat

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Conspecific violence has been pervasive throughout evolutionary history. The current research tested the hypotheses that individuals implicitly categorize combative contexts (i.e., play fighting, status contests, warfare, and anti-exploitative violence) and use the associated contextual information to guide expectations of combative tactics. Using U.S. and non-U.S. samples, Study 1 demonstrated consistent classification of combative contexts from scenarios for which little information was given and predictable shifts in the acceptability of combative tactics across contexts. Whereas severe tactics (e.g., eye-gouging) were acceptable in warfare and anti-exploitative violence, they were unacceptable in status contests and play fights. These results suggest the existence of implicit rules governing the contexts of combat. In Study 2, we explored the reputational consequences of violating these implicit rules. Results suggest that rule violators (e.g., those who use severe tactics in a status contest) are given less respect. These are the first studies to implicate specialized mechanisms for aggression that use contextual cues of violence to guide expectations and behavior.

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Predatory combat and tail wrestling in hierarchical contests of the Neotropical rattlesnake Crotalus durissus terrificus (Serpentes: Viperidae)

Abstract: Predatory combat and tail wrestling in hierarchical contests of the Neotropical rattlesnake Crotalus durissus terrificus (Serpentes: Viperidae)

Cited by 16 publications

References 19 publications

Custos reprodutivos em Crotalus durissus (Serpentes, Viperidae) do Estado de São Paulo, Brasil.

Custos reprodutivos em Crotalus durissus (Serpentes, Viperidae) do Estado de São Paulo, Brasil.

Ritualized male–male combat resulting from intraspecific food competition in three Agkistrodon species

The Implicit Rules of Combat

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