Chronic low humidity‐stress in the lizard <i>Anolis carolinensis</i>: Changes in diurnal corticosterone rhythms

Summers, Cliff H.; Norman, Mark F.

doi:10.1002/jez.1402470311

Cited by 39 publications

(23 citation statements)

References 43 publications

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“…A dependência de ambientes úmidos e a vulnerabilidade a baixas umidades são situações conhecidas para diversas espécies de répteis (Colli, 1991;Daltry et al, 1998;Nicholson et al, 2005;Huey et al, 2009;Carlson et al, 2014). Em lagartos e serpentes, por exemplo, a umidade pode afetar os níveis hormonais (Summers & Norman, 1988), o período reprodutivo (Colli, 1991;Bernarde & Abe, 2006), as taxas de perda de água por evaporação através da pele (Daltry et al, 1998;Nicholson et al, 2005) e o comportamento durante períodos de troca de pele (Carlson et al, 2014). No caso das serpentes, muitas espécies também aumentam suas atividades durante períodos chuvosos devido à maior disponibilidade de presas, como os anfíbios anuros (Oliveira & Martins, 2001;Bernarde & Abe, 2006;Hartmann et al, 2009;Rocha et al, 2014).…”

Section: Discussionunclassified

Diversidade local e influência da sazonalidade sobre taxocenoses de anfíbios e répteis na Reserva Extrativista Chico Mendes, Acre, Brasil

França

Freitas

Ramalho³

et al. 2017

Iheringia, Sér. Zool.

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ABSTRACT. Local diversity and infl uence of seasonality on amphibians and reptiles assemblages in the Reserva Extrativista Chico Mendes, Acre, Brazil. Despite the high richness of amphibians and reptiles known for the southwestern portion of the Brazilian Amazon, the knowledge of these is punctual and few studies have evaluated the temporal variations in the occurrence and abundance of species. The goals of this study were to present the amphibians and reptiles assemblages in a locality of the Chico Mendes Extractive Reserve, verify which climate variables infl uence the temporal fl uctuations in richness and abundance, and identify the main species of the amphibians and reptiles infl uenced by them. The study area is located in the Seringal Etelvi region, southwestern portion of the Reserve, municipality of Brasiléia, state of Acre. Data collection took place between October 2011 and September 2012, for 48 sampling days, using the methods of searches limited by time and pitfall traps. There were recorded 978 specimens of 31 amphibians and 54 reptiles. Higher richness and abundance of amphibians occurred during the rainy season, with the monthly abundance positively associated with the mean temperature. Only the abundance of reptiles was higher during the rainy period. However, both richness and abundance were positively associated with mean temperature. Four amphibians, Allobates gr. marchesianus, Hamptophryne boliviana (Parker, 1927), Boana geographica (Spix, 1824) and Rhinella marina (Linnaeus, 1758), and two reptiles, Kentropyx pelviceps Cope, 1868 and Norops fuscoauratus (D'Orbigny, 1837), had their monthly abundances positively associated with the mean temperature. The lizard Dactyloa punctata (Daudin, 1802) had the monthly abundance associated with precipitation. It was possible to verify the increase of richness and abundance of amphibians and reptiles during periods when the availability of resources is favorable for many species. Species can react diff erently to climatic variations, whereas others are sensitive to fl uctuations, others seem answer easily or not reduce their abundances in periods theoretically unfavorable.KEYWORDS. Richness, abundance, Southwestern Amazonia, seasonality, temporal variation.RESUMO. Apesar da elevada riqueza de anfíbios e répteis conhecida para a porção Sul-Ocidental da Amazônia brasileira, o conhecimento sobre estes é pontual e poucos estudos avaliaram as variações temporais na ocorrência e abundância das espécies. Os objetivos deste estudo foram descrever as taxocenoses de anfíbios e répteis em uma localidade da Reserva Extrativista Chico Mendes, verifi car quais variáveis climáticas infl uenciam as fl utuações temporais na riqueza e abundância e identifi car as principais espécies de anfíbios e répteis infl uenciadas por elas. A área de estudo está localizada na região do Seringal Etelvi, porção sudoeste da Reserva, município de Brasiléia, estado do Acre. A coleta de dados ocorreu entre outubro de 2011 e setembro de 2012, num total de 48 dias de amostragem, com os mét...

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Section: Discussionunclassified

Diversidade local e influência da sazonalidade sobre taxocenoses de anfíbios e répteis na Reserva Extrativista Chico Mendes, Acre, Brasil

França

Freitas

Ramalho³

et al. 2017

Iheringia, Sér. Zool.

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“…This conclusion warrants study, for at this time no data are available to support or reject the hypothesis that stress is directly inhibiting reproductive activity in wild or farmed reptiles. (See Summers and Norman, 1988, for data showing that stressful housing conditions do inhibit reproduction in the lizard Anolis carolinensis in a laboratory setting. )…”

Section: Ctenophorus Ornatusmentioning

confidence: 95%

“…Adult female c. 3 wk Summers and Norman (1988) Ovariectomy Cnemidophorus uniparens Adult female 7m Grassman and Crews (1990) Exposure to saline water…”

Section: Anolis Carolinensismentioning

confidence: 99%

Biology of stress: interactions with reproduction, immunology and intermediary metabolism

GuilletteJr.¹,

Cree²,

Rooney³

1995

Health and Welfare of Captive Reptiles

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Animals must maintain a steady physiological state, homeostasis, in response to a changing environment. An understanding of the stress response is essential if one is to appreciate the complex physiological mechanisms maintaining homeostasis in vertebrates. Moreover, a comprehensive understanding of the biology of stress is essential if we are to reduce stress in the care of any vertebrate species, induding those that are not domesticated and traditional laboratory animals.The goals of this chapter are to review our knowledge of the phenomenon of the physiological stress response in vertebrates generally, and then to describe in detail the limited information available on the biology of stress in reptiles. We shall not deal with psychic or emotional considerations of stress in reptiles. Specifically, we focus on the interactions between the physiological stress response and reproduction, immune function and intermediary metabolism. These three areas are critical to any husbandry and captive management programme. If not prevented or countermanded, the detrimental aspects of the stress response mounted by, for example,

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“…observ. ], and plasma glucocorticoid levels become elevated [Greenberg and Crews, 1990;Summers and Norman, 1988]. Dissimilar secretion of corticosteroids has been demonstrated in socially dominant and subordi nate animals in both mammals [Sapolsky, 1982] and A. carolinensis IGreenberg et al" 1984a).…”

Section: Introductionmentioning

confidence: 99%

Activation of Central Biogenic Amines Following Aggressive Interaction in Male Lizards, <i>Anolis carolinensis</i>

Summers

Greenberg

1995

Brain Behav Evol

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Many stimuli, including social aggression, activate endocrine stress mechanisms, presumably mediated or modulated by central neurotransmitters. To determine the effects of aggression on central neurochemistry, reproductively active male Anolis carolinensis were paired and allowed to establish social dominance relationships. While combatants cohabited, the fight losers invariably became socially subordinate and displayed darker color, selection of lower perch sites, and lower body posture than the winners. After one hour, one day, one week, or one month of cohabitation animals were sacrificed. Each member of a pair was killed at approximately the same time, along with animals kept isolated as controls. Diencephalon, non-optic lobe midbrain and hindbrain were analyzed for indoleamines, catecholamines and metabolites by coulochem electrode array HPLC. Early activation (by one hour) of the serotonergic system in subordinate male lizards was indicated by decreased serotonin (5-HT), increased 5-hydroxy-indoleacetic acid (5-HIAA) levels and 5-HIAA/5-HT ratio. Substrate 5-hydroxy-tryptophan (5-HTP) also increased in losing males, suggesting enhanced production as well as turnover. Significant 5-HTP and 5-HIAA/5-HT increases for subordinate males, compared with levels in control and dominant males, were greatest at one hour and diminished thereafter. This pattern of indoleamine system activation is consistent with stress-induced stimulation of the serotonergic system and prolonged activation of the stress response in subordinate animals, as well as serotonergic inhibition of aggression. In contrast with serotonin, subordinate males did not have increased catecholamine system activation following one hour of interaction. The ratio of DOPAC/dopamine was lower following one hour of interaction in subordinate males. Adrenergic system activation, indicated by metanephrine/epinephrine ratio, increased with time in losing males, except that after one month of cohabitation, turnover returned to levels that equaled those of control animals. Noradrenergic metabolite MHPG, as well as MHPG/NE ratio, were significantly reduced in dominant males at one hour and one week. Changes in adrenergic system activation, not seen in or registered by noradrenergic systems, indicate a possible role for central epinephrine in social stress accommodation.

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Chronic low humidity‐stress in the lizard Anolis carolinensis: Changes in diurnal corticosterone rhythms

Cited by 39 publications

References 43 publications

Diversidade local e influência da sazonalidade sobre taxocenoses de anfíbios e répteis na Reserva Extrativista Chico Mendes, Acre, Brasil

Diversidade local e influência da sazonalidade sobre taxocenoses de anfíbios e répteis na Reserva Extrativista Chico Mendes, Acre, Brasil

Biology of stress: interactions with reproduction, immunology and intermediary metabolism

Activation of Central Biogenic Amines Following Aggressive Interaction in Male Lizards, <i>Anolis carolinensis</i>

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