Selma M Almeida-Santos

Selma M Almeida-Santos
Instituto Butantan | butanan · Laboratório de Ecologia e Evolução - LEEV

PhD

About

82
Publications
26,424
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,605
Citations
Citations since 2017
15 Research Items
893 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
I am interested in reproductive strategies of Squamata. I work on several projects including studies on sperm storage, reproductive cycles, morphology of the reproductive tract, reproductive modes, reproductive endocrinology, and reproductive behavior (male-male combat, aggregations, courtship, and mating). I seek to interpret such information in an ecological-evolutionary context, trying to indetify patterns that explain the reproductive diversity in Neotropical snakes.
Additional affiliations
January 2008 - present
University of São Paulo
Position
  • Collaborator Professor
January 2004 - present
Instituto Butantan
Position
  • Scientfic Researcher

Publications

Publications (82)
Chapter
Females of many squamates maintain viable sperm in their reproductive tract after insemination. This 'female sperm storage' (FSS) has several advantages and clear implications for squamate evolution by dramatically influencing life histories, mating systems, and sexual selection and conflict. In this chapter, we summarize the literature on the anat...
Article
Full-text available
Life history strategies determine and influence many aspects of species fitness. In this study, we describe the reproductive biology - reproductive cycle, sperm storage, and sexual maturity - of Thamnodynastes strigatus in South Brazil. We analyzed 49 individuals (25 males and 24 females) from herpetological collections. The reproductive cycle of m...
Article
Full-text available
Snakes engaged in agonistic encounters may employ visual and tactile displays that sometimes culminate in ritual combat. Here, we describe novel male-male ritual combat behaviors in South American coral snakes in the Micrurus ibiboboca complex based on the largest observational dataset of ritual combat for any species of the genus Micrurus. The dat...
Article
Changes in the body temperature (Tb) of reproductive females are well documented in squamate reptiles. However, the direction of these changes varies among species. Pregnant females may exhibit a lower or higher (and less variable) Tb than nonpregnant females. In some species, pregnancy has no detectable effect on female Tb. In this study, we compa...
Book
O conhecimento sobre a biologia reprodutiva é importante para a conservação das jararacas. Dados sobre fecundidade e maturidade sexual podem ser utilizados em modelos que forneçam estimativas sobre as tendências populacionais. Além disso, é subsídio para o manejo das espécies em cativeiro, o que tem impacto para a manutenção de um plantel viável pa...
Article
Full-text available
Information on demographic, genetic, and environmental parameters of wild and captive animal populations has proven to be crucial to conservation programs and strategies. Genetic approaches in conservation programs of Brazilian snakes remain scarce despite their importance for critically endangered species, such as Bothrops insularis, the golden la...
Article
Reproductive traits vary widely within and among snake species, and are influenced by a range of factors. However, additional studies are needed on several species, especially on tropical snake faunas, to fully understand the patterns of reproductive variation in snakes. Here, we characterized the reproductive biology of B. jararacussu from southea...
Article
Sperm storage is common in the oviducts of female snakes and results in the decoupling of mating from ovulation and fertilization. In the majority of female snakes examined, sperm storage occurs in receptacles of the infundibular regions of the oviducts. In pitvipers (Viperida, Crotalinae), the storage of sperm was described in the caudal regions o...
Article
The evolution of viviparity requires eggshell thinning to bring together the maternal uterus and extraembryonic membranes to form placentae for physiological exchanges. Eggshell thinning likely involves reduced activity of the uterine glands that secrete it. We tested these hypotheses by comparing the uterine and eggshell structure and histochemist...
Article
Bothrops moojeni inhabits riparian forests and adjacent open, wet areas in the Brazilian Cerrado. We address several aspects of the reproductive biology of a population from southeastern Brazil, including sexual maturation and dimorphism, male and female reproductive cycles, and sperm storage. We also provide the first record of male-male combat be...
Article
Full-text available
In this study, we describe the female reproductive cycle of Philodryas patagoniensis in south Brazil, which was described through morpho-anatomical and histological analyses. The peak of secondary vitellogenesis occurred during winter–spring (July–December), ovulation in spring (October–December), mating and fertilization in spring–summer (October–...
Article
Full-text available
We describe two new aspects of male reproduction in the pit viper Bothrops cotiara: the formation of mating plugs and epididymal sperm storage. Based on histological analyses of specimens (four males and three females), we propose that long-term sperm storage occurs in the ductus deferens, whereas macroscopic hypertrophy indicates that the epididym...
Article
The male reproductive cycle of Philodryas patagoniensis in south Brazil was described through morpho-anatomical and histological analysis of individuals deposited in zoological collections. Spermatogenesis occurred during late autumn–winter (June–September) and spermiogenesis occurred in spring–summer (October–March). The volume of the testes was s...
Article
Viviparity has evolved at least 115 times in squamates and these multiple origins have raised a series of functional and evolutionary questions. Ideally, testing evolutionary hypotheses on squamate viviparity requires focusing on closely related taxa that exhibit both reproductive modes. South American water snakes of the tribe Hydropsini (genera H...
Article
Full-text available
We investigated the gross anatomy, histology and ultrastructure of Duvernoy's glands and scanning electron microscopy of maxillary teeth of Helicops modestus, as well as its prey-handling behavior in laboratory. We later compared this histology with other species of Hydropsini. Duvernoy's glands are located in the post-ocular region, immediately be...
Article
Full-text available
We investigated food patterns in the diet composition of 452 specimens of Crotalus durissus from Central Brazil. Thirty-three items were recorded corresponding to four categories: rodents (75.76%), marsupials (6.06%), unidentified mammals (9.09%) and reptiles (9.09%). Adults of both sexes and some juveniles feed mostly on mammals, specifically rode...
Article
Full-text available
Natural history studies on Neotropical snake fauna are still scarce. Even though reproductive data for the aquatic snake Helicops carinicaudus is available, the lack of information on courtship, copula and reproductive behaviour in the field is noteworthy. Copulation of H. carinicaudus and necrophilia in snakes in nature is reported for the first t...
Article
Full-text available
Macroscopic and microscopic examination of the female reproductive tract of Philodryas patagoniensis was conducted in order to observe sperm storage structures and determine morphological changes throughout the reproductive cycle. The oviduct of P. patagoniensis is composed of the infundibulum (anterior and posterior), uterus, utero-vaginal junctio...
Article
Full-text available
A reprodução faz parte do ciclo de vida dos animais permitindo a perpetuação e a conservação das espécies. Em serpentes, existe uma escassez de informações técnicas a respeito do ciclo reprodutivo. Este estudo teve o objetivo de avaliar o aparelho reprodutivo por meio da ultrassonografia em serpentes vivíparas cativas da família Boidae, permitindo...
Article
Full-text available
The reproduction is part of the animal life cycle allowing the perpetuation and conservation of the species. In snakes, there is a shortage of technical information about the reproductive cycle. The objective of this study was to evaluate the reproductive tract by ultrasonography in captive viviparous snakes of the Boidae family, allowing diagnose...
Article
Full-text available
Few extensive studies have addressed the ecology of South American colubrids. Spilotes pullatus is a large and conspicuous colubrid snake with a broad distribution in South America. We analyzed the morphology, habitat use, diet, feeding behavior, and reproductive biology of S. pullatus in a subtropical area of distribution, specifically in the Atla...
Article
Full-text available
The reproductive biology of Bothrops erythromelas, a small pit viper from the Caatinga, a semiarid biome in Brazil, is described based on analysis of individuals deposited in zoological collections. Males are smaller and also attain sexual maturity at a smaller size than females. Female reproductive cycle is seasonal with an extended period of seco...
Article
Full-text available
Two populations of the Neotropical lancehead Bothrops leucurus were studied in two locations in Brazil (Espírito Santo, ES, and Bahia, BA) with different rainfall seasonality patterns. The timing of reproduction was very similar in both populations, with the mating season occurring in autumn (when spermatozoa were found in uteri) and births occurri...
Article
Full-text available
A biologia reprodutiva de serpentes compreende diversos tópicos como modos reprodutivos, ciclos reprodutivos, fecundidade (tamanho da ninhada, tamanho dos filhotes, massa relativa da ninhada e frequência reprodutiva), idade e tamanho na maturidade, dimorfismo sexual, sistemas de acasalamento e comportamentos reprodutivos como corte e cuidado parent...
Article
Fossorial snakes have attracted little scientific attention in studies of natural history, despite their relevance to capture the range of evolutionary-ecological strategies of snakes. In this study, we examined 62 preserved specimens of Phalotris lativittatus (a member of the fossorial and poorly studied Elapomorphini tribe) to obtain information...
Article
The Golden Lancehead (Bothrops insularis) is a critically endangered snake endemic to the Queimada Grande Island in southeastern Brazil. Here, we provide data on reproductive biology of B. insularis obtained in the field and from preserved museum specimens and compare our results with its mainland relative Bothrops jararaca. Similar to other Bothro...
Technical Report
Full-text available
Silva KB. et al. Hemipenicectomia em Jararaca-Ilhoa (Bothrops insularis) -Relato de Caso. Vet. e Zootec. 2013 set.; 20(3): ppp-ppp. RESUMO Prolapsos do órgão copulatório podem ocorrer em serpentes e lagartos, embora sejam mais comuns em quelônios. Estão associados a causas diversas, tais como trauma envolvendo o músculo retrator do hemipênis ou o e...
Article
Full-text available
New World Coral Snakes (genus Micrurus) occur from North to South America in a wide range of climates and habitats. Using both original and published data, we show that reproductive patterns diverge in the two phylogenetic lineages of Micrurus within the subtropical regions. Species with black rings arranged in triads are characterized by males lar...
Article
Full-text available
This study describes the male reproductive cycle of Sibynomorphus mikanii from southeastern Brazil considering macroscopic and microscopic variables. Spermatogenesis occurs during spring-summer (September-December) and spermiogenesis or maturation occurs in summer (December-February). The length and width of the kidney, the tubular diameter, and th...
Article
Full-text available
A maioria das espécies do gênero Bothrops apresenta reprodução sazonal. O período de acasalamento geralmente ocorre no outono e a parturição é observada ao final no verão. Entretanto, há relatos de ampla variação destes aspectos reprodutivos (e.g. época de acasalamento, gestação e nascimento) principalmente em espécies mantidas em cativeiro. De...
Article
New World Coral Snakes (genus Micrurus) occur from North to South America in a wide range of climates and habitats. Using both original and published data, we show that reproductive patterns diverge in the two phylogenetic lineages of Micrurus within the subtropical regions. Species with black rings arranged in triads are characterized by males lar...
Article
Full-text available
We studied reproductive patterns in neotropical rattlesnakes (Crotalus durissus) from areas with different climatic conditions. The timing of female reproductive events (vitellogenesis, sperm storage and parturition) was identical in both regions, therefore we assume it to be phylogenetically conserved. However, size at maturation in both sexes and...
Article
Full-text available
DURISSUS (neotropical rattlesnake): REPRODUCTION. Crotalus durissus is the only rattlesnake species in Brazil (Campbell & Lamar, 2004). Its reproductive cycle is seasonal and parturition occurs from December to March, during the summer (Almeida-Santos & Salomão, 1997; 2002; Barros et al., in press). Herein we present a new record of a litter of C....
Article
Full-text available
Many factors influence microhabitat including climate and the occurrence of predators, prey and suitable shelters. The influence of predators in a semi-extensive breeding system is minimized due to frequent monitoring of the area. This situation enables the independent analysis of such other variables as refuges and temperature. Some specimens of t...
Article
Full-text available
http://dx.doi.org/10.5007/2175-7925.2010v23n1p155 Esse artigo descreve pela primeira vez xantismo em dois exemplares de B. jararaca e um acidente ofídico causado por um desses espécimes. Possíveis vantagens adaptativas para as espécies portadoras de tal anomalia cromática são discutidas. Para isso, foram analisados um exemplar macho proveniente de...
Article
Resumo Os primeiros casos conhecidos de xantismo em dois exemplares de Bothrops jararaca e um acidente ofídico causado por um desses espécimes são descritos. Possíveis vantagens adaptativas para as espécies portadoras de tal anomalia cromática são discutidas. Para isso, foram analisados um exemplar macho proveniente de Jaraguá do Sul – SC e uma fêm...
Article
Full-text available
Data on life history traits (fecundity, egg size, relative clutch mass, hatchling size) of the snake Phalotris lativittatus are reported. This is the first record of such data for this rare endemic species of the Brazilian Cerrado biome. Fecundity is low, but relative clutch mass is high for the species, as well as for other fossorial squamates.
Article
Full-text available
Chironius bicarinatus is a common colubrid snake, widely distributed throughout the Atlantic Forest. Field observations of copulation and combat, combined with data on preserved and captive snakes, as well as on specimens brought to Institute Butantan provided a better characterization of the reproductive cycle of this species. Chironius bicarinatu...
Article
Full-text available
To understand the role of peptidases in seminal physiology of Crotalus durissus terrificus, intra- and inter-seasonal activity levels of acid (APA), basic (APB), puromycin-sensitive (APN-PS) and puromycin-insensitive neutral (APN-PI), cystyl (CAP), dipeptidyl-IV (DPPIV), type-1 pyroglutamyl (PAP-I) and prolyl-imino (PIP) aminopeptidases as well as...
Article
Full-text available
A atividade sazonal de quatro espécies de Micrurus do sul e sudeste do Brasil foi inferida por meio de dados de exemplares trazidos ao Instituto Butantan ao longo de oito anos. Para a maioria das espécies, a atividade na superfície foi significativamente menor no período mais seco e frio. Baixas temperaturas podem reduzir a taxa metabólica de serpe...
Article
Seasonal quantitative patterns of acid (APA), basic (APB), puromycin-sensitive (APN-PS) and puromycin-insensitive neutral (APN-PI), cystyl (CAP), dipeptidyl IV (DPPIV), type-1 pyroglutamyl (PAP-I) and prolyl-imino (PIP) aminopeptidases and prolyl oligopeptidase (POP) activities in soluble (SF) and solubilized membrane-bound (MF) fractions from duct...
Article
Full-text available
To understand the role of peptidases in seminal physiology of Crotalus durissus terrificus, activity levels of representative enzymes in semen and their sensitivities to inhibitors, cofactors and peptide hormones were evaluated. The existence of seminal fractions and the association of peptidases with these fractions were also characterised for the...
Article
Full-text available
RESUMO O perfil epidemiológico dos acidentes ofídicos na região noroeste do estado de São Paulo foi obtido com base no levantamento de dados da Direção Regional de Saúde XXII de São José do Rio Preto. Este trabalho foi realizado com a pretensão de caracterizar e associar esse perfil às atividades biológicas das serpentes. Para isso, foram registrad...
Article
If selective forces on locomotor ability and reproductive biology differ among habitats, we expect to see relationships between habitat, morphology, and life-history traits. Comparative (phylogenetically based) analysis of data from 12 pythonid and 12 boid snake species reveals multiple evolutionary shifts in habitat use, notably in the evolution o...
Article
Full-text available
Dissection of preserved Atlantic coral snakes Micrurus corallinus, plus field data and histological analysis, provided information on male reproductive cycles. Testes are larger during autumn, when sperm production occurs, and smaller in spring, when spermatogenesis stops. The diameter of the distal deferent ducts is small in summer–autumn, when sp...
Article
Full-text available
Male-male combat is a ritualized behaviour occurring mainly during the mating season (Greene, 1997; Schuett, 1997; Schuett et al., 2001) which is widespread among snake families including Boidae, Elapidae, Viperidae and Colubridae (Shine, 1978, 1994). Male-male combat is an example of intrasexual selection in which males compete for access to femal...
Article
Full-text available
Resumo: Acidentes ofídicos ainda hoje são causas de injúrias diversas e alto índice de morbidade não só no Brasil como na América Latina, especialmente entre populações rurais, tendo como consequência altos índices de dependência da comunidade produtiva dos setores de previdência social pública. Neste trabalho, procurou-se avaliar a penetração e a...
Article
Full-text available
SNAKE HUSBANDRY IN INSTITUTO BUTANTAN: II - LONGEVITY OF GENERA Bothrops, Crotalus and Lachesis. Snake husbandry is a determinant factor in the efficiency of antivenom production, as well as in the supply of venom for institutional research and in other purposes. In this work we analyse data obtained in the bioterium of Laboratório de Herpetologia...
Article
Full-text available
SNAKE HUSBANDRY IN INSTITUTO BUTANTAN: I - LONGEVITY OF GENUS Micrurus. Snake husbandry is a determinant factor in the efficiency of antivenom production. In this work we analyse data obtained from the bioterium of Laboratório de Herpetologia, Instituto Butantan concerning elapid snake (n = 3509) genus Micrurus. Longevity and venom production throu...
Article
Full-text available
Crotaline snakes present delayed fertilization and sperm storage because secondary vitellogenesis is not completed by the time of mating. The release of vitellogenesis and synchrony between ovulation and fertilization suggest a steroidal modulation. We investigated changes of sexual steroid levels during reproduction in the Neotropical rattlesnake...
Article
Full-text available
Crotaline snakes store sperm by means of a uterine musculature twisting (UMT). We investigated the influence of plasma levels of estradiol and progesterone and vasotocinase cystine aminopeptidase (CAP) activity on UMT formation and maintenance, and the in vitro uterine reactivity for AVT in Crotalus durissus terrificus in primary or secondary vitel...
Article
Seasonal variations in spermatozoa numbers and in sperm motility along the vas deferens in Crotalus durissus terrificus from southeastern Brazil were analyzed. Our data demonstrate storage and motility of the spermatozoa along the vas deferens throughout the year. This is characteristic of a postnuptial reproductive cycle, usually found in snakes l...
Article
Full-text available
Dissection of 286 specimens of the Bothrops neuwiedi pubescens, combined with data on captive individuals, provided information on the reproductive biology of this viperid snake from southern Brazil. Females attained larger body sizes than males, and reproduction was seasonal with mating taking place in autumn when males were more frequently encoun...
Article
Full-text available
Opossums are considered natural predators of snakes and possess resistance to the venom of some viperids. The resistance of Didelphis to Crotalus venom has been demonstrated through biochemical and immunologi-cal assays. However, systematic observations on the behavior of adult Didel-phis preying on venomous snakes have never been conducted. In thi...
Article
The subspecies of the South American rattlesnake, Crotalus durissus are classified according to their external morphological features and geographical distribution. We have determined some biological activities of C. durissus cascavella, C. durissus collilineatus and C. durissus terrificus venoms. C. durissus terrificus had a significantly higher c...