Igor Luis Kaefer

Igor Luis Kaefer
Federal University of Amazonas | UFAM · Department of Biology

PhD

About

100
Publications
31,318
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1,109
Citations
Introduction
Professor at the Department of Biology, Federal University of Amazonas, Brazil; former affiliate of the Brazilian Academy of Sciences; editor of the journals Annals of the Brazilian Academy of Sciences and Neotropical Biodivesity. Research interests are broad within biology and include behavior, ecology and evolution of amphibians and reptiles. ResearcherID: A-3413-2009. ORCID: 0000-0001-6515-0278. Scopus Author ID: 23466728200. Lattes CV: http://lattes.cnpq.br/7592372945105122.
Additional affiliations
March 2014 - present
Instituto Nacional de Pesquisas da Amazônia
Position
  • Consultant
April 2013 - present
Federal University of Amazonas
Position
  • Consultant

Publications

Publications (100)
Article
Full-text available
We studied the reproductive biology of an invasive population of the bullfrog Litho-bates catesbeianus by analyzing individuals captured in the central Rio Grande do Sul state, southern Brazil. Specimens were collected during 12 field trips held from May 2002 to June 2003. We analyzed gonad development stages in 216 individuals to evaluate the fecu...
Article
Full-text available
Phylogeographic perspectives incorporating multiple classes of characters, especially those relating to sexual signals, are promising for the elucidation of recent evolutionary mechanisms driving speciation. Here, forest frogs were used as a model system to access distinct stages in the process of evolutionary differentiation. We studied 280 indivi...
Article
Full-text available
Here we describe a new species of the toad genus Amazophrynella (Bufonidae) from the south margin of the Amazon River in Santarém, state of Pará, Brazilian Amazonia. The new species can be diagnosed by (1) medium body size for the genus: adult females 19.5-20.4 mm SVL, adult males 13.0-14.5 mm SVL; (2) snout acuminate in lateral view; (3) Finger I...
Article
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We investigated 1) the role of area per se in explaining anuran species richness on reservoir forest islands, after controlling for several confounding factors. We also assessed 2) how sampling design affects the inferential power of island species–area relationships (ISARs) aiming to 3) provide guidelines to yield reliable estimates of area‐induce...
Article
Soundscape studies are increasingly used to capture landscape‐scale ecological patterns. Yet, several aspects of soundscape diversity remain unexplored. Although some processes influencing acoustic niche usage may operate in the 24‐hour temporal domain, most acoustic indices only capture the diversity of sounds co‐occurring in sound files at a spec...
Article
Full-text available
Early detection of predators is fundamental for the survival of the prey. Predator detection can occur by perception of the chemical substances released by predators or injured conspecifics, granting prey the opportunity to avoid the attack. However, overreacting to cues can generate false alarm reactions that result in fruitless energetic costs. G...
Chapter
Aim: The main focus of this chapter is to provide a brief overview on global patterns of diversity and conservation of wetlands herpetofauna and discuss both ecological and morphological adaptations that facilitate life in such environments. By treating Amazonian wetland amphibians and reptiles as our case studies, we examine their level of specif...
Preprint
Full-text available
1. Soundscape studies are increasingly common to capture landscape-scale ecological patterns. Yet, several aspects of soundscape diversity quantification remain unexplored. Although some processes influencing acoustic niche usage may operate in the 24h domain, most acoustic indices only capture the diversity of sounds co-occurring in sound files at...
Article
Full-text available
Reptiles and amphibians are exceptional hosts for different ectoparasites, including mites and ticks. In this study, we investigated tick infestations on reptiles and amphibians trapped in Central Amazonia, and also assessed the presence of rickettsial infections in the collected ticks. From September 2016 to September 2019, 385 reptiles (350 lizar...
Article
Anti-predator mechanisms play a key role in the survival of any animal in nature. Anurans exhibit a great diversity of defensive behaviours and interact with the widest range of predators of any vertebrates. However, there are few systematic and experi- mental studies of anuran defensive behaviours, which are generally opportunistic. Here, we deplo...
Article
Full-text available
Due to the importance of camouflage to avoid detection by predators, predation pressure can cause coupled evolution of skin colour and preference for substrate colour. Individuals can choose regions where the background makes their skin colour less noticeable (crypsis) or where it accentuates warning coloration (aposematism). In such scenario, indi...
Article
Sexual selection predicts evolution of secondary sexual traits favoring mating. Here, we address the within population variation in courtship display behavior among male White-throated Manakins, Corapipo gutturalis, from Central Amazonia. We repeatedly quantified the courtship display elements used by 16 males over multiple days and specifically te...
Article
Full-text available
In poison frogs (Dendrobatoidea), usually the males are territorial, care for terrestrial nests and later transport their offspring to waterbodies where they complete larval development. In some species, mothers care for their offspring or may exhibit flexible care to compensate for father absence. We conducted a multi-season field experiment with...
Article
Full-text available
A região do interflúvio dos rios Purus e Madeira é ambientalmente diversa e lar de espécies de plantas e animais ainda desconhecidos pela humanidade, principalmente as mais pequenas, que são difíceis de enxergar. Para descobrir essas espécies, é preciso atenção e cuidado. Foi assim que, em 2018, o grupo de pesquisadores do qual faço parte encontrou...
Article
Full-text available
Geographical and environmental distances influence the divergence of characters among biological populations, especially on a macro spatial scale, making it difficult to interpret the individual contribution of these predictor variables in the process of population differentiation. Anurans are excellent models for multi-character evolutionary studi...
Article
Full-text available
A contentious aspect in dendrobatoid frog behaviour is the recognition of the predominant factor—if any—driving male mating success. This is probably related to an extensive correlation among different male quality predictors. Here, we investigated the diurnal and territorial nurse frog Allobates subfolionidificans by means of a field study during...
Chapter
Aim: The main focus of this chapter is to provide a brief overview on global patterns of diversity and conservation of wetlands herpetofauna and discuss both ecological and morphological adaptations that facilitate life in such environments. By treating Amazonian wetland amphibians and reptiles as our case studies, we examine their level of specifi...
Article
Full-text available
The increasing urbanization of the Amazonian biome has promoted the creation of several forest fragments surrounded by an urban matrix, but the relationship of animal assemblages to the urban environment, especially in forest fragments, is poorly known. Here we aimed to 1) determine the composition of the squamate fauna of the largest urban forest...
Article
Full-text available
Blood samples from 72 Ameiva ameiva lizards from Central Amazonian upland forests were collected, and thin smears of 40 (55.5%) animals were positive for gamonts of Hepatozoon with a mean level of intensity of infection of 14 parasites/2000 blood erythrocytes (0.73%). The gametocytes were found attached with host cells’ nuclei, and their dimensions...
Article
Full-text available
Blood samples from 330 lizards of 19 species were collected to investigate the occurrence of haemoparasites. Samplings were performed in areas of upland (terra-fi rme) forest adjacent to Manaus municipality, Amazonas, Brazil. Blood parasites were detected in 220 (66%) lizards of 12 species and comprised four major groups: Apicomplexa (including hae...
Article
Full-text available
Envenomation by coral snakes represents a little known burden in Brazilian Amazonia. So far, details on clinical and epidemiological aspects remain obscure in the region. We gathered data from medical charts and from the scientific collection of snakes from Fundação de Medicina Tropical Doutor Heitor Vieira Dourado, finding 26 cases of envenomation...
Article
Defensive behaviours are a prime strategy for animal survivorship. However, the diversity of defence displays still needs systematic studies, since most reports are based on opportunistic field observations. In this study, we explore the defensive behaviour of the cane toad, Rhinella marina, collecting data from 173 individuals. As a result, here w...
Article
Full-text available
Investigating the role of historical and ecological factors structuring assemblages is relevant to understand mechanisms and processes affecting biodiversity across heterogeneous habitats. Considering that community assembly often involves scale-dependent processes, different spatial scales may reveal distinct factors structuring assemblages. In th...
Article
The American bullfrog Lithobates catesbeianus has a natural distribution in North America, but was spread by human activities in different regions around the world. It is listed as the most invasive amphibian species, affecting terrestrial and aquatic ecosystems and the community of native species. In addition, the American bullfrog is extensively...
Article
Full-text available
Bothrops atrox snakes are mostly endemic of the Amazon rainforest and is certainly the South American pit viper responsible for most of the snakebites in the region. The composition of B. atrox venom is significantly known and has been used to trace the relevance of the venom phenotype for snake biology and for the impacts in the clinics of human p...
Article
Full-text available
Snakes are a diverse group of terrestrial vertebrates of the order Squamata. Despite that, in the Amazonian biome, information about distribution and identification of snakes is limited when compared to other groups. Additionally, in Amazonia there is a sampling bias towards areas geographically close to urban centers and more densely populated are...
Article
Full-text available
While intraspecific variation in aposematic signals can be selected for by different predatory responses, their evolution is also contingent on other processes shaping genetic variation. We evaluate the relative contributions of selection, geographic isolation, and random genetic drift to the evolution of aposematic color polymorphism in the poison...
Article
Coral snakes constitute a relatively diverse and little known group of venomous snakes. So far, data for this kind of snakebite in the Amazon region are based only on case reports. This study takes advantage of novel data from the Brazilian Health Ministry database from 2010 to 2015 and presents a review of the cases reported in the literature rega...
Article
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Here we report the local extinction of Scinax caldarum, an endemic tree frog species of the Brazilian Atlantic Forest. We also report a reduction of the geographic range of this species to less than 15 % of the area in which it occurred 27 years earlier. We consider the excessive use of agrochemicals to be the main factor explaining the decline, in...
Article
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Introduction: Snake venom composition shows significant inter- and intra-species variation. In the case of the viperid species Bothrops atrox, responsible for the majority of snakebites in the Amazon region, geographical and ontogenetic variables affect venom composition, with ecological and medical implications. Previous studies had shown that ven...
Article
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Here we present data on the identity and geographic distribution of lizard taxa in the Purus-Madeira interfluve, along the road BR-319 in Brazilian Amazonia. We sampled 10 modules located at least 40 kilometres from each other. Data collection was performed through active search on vegetation and leaf-litter along 250 m-long transects, and by occa...
Article
Detecting ecological patterns is highly dependent on the spatial scale of the analysis. However, the importance of scale has been poorly explored when testing environmental influences and estimating niche overlap between animal species. In this study, we tested the hypotheses that: 1) environmental influences on species distribution at different ge...
Article
Full-text available
ABSTRACT The pitviper Bothrops atrox is a widely distributed and medically important snake in Amazonia. Given that the reproductive and feeding biology of snakes varies geographically, we aimed to characterize the natural history of individuals from the central and southwestern portions of the biome. We analyzed museum-preserved specimens collected...
Article
The use of lizards as model organisms in ecological studies is based on their success in occupying a great diversity of habitats, and some species are closely tied to the environment, which is disadvantaged by the legislation of several countries concerning land use. Our aim was to relate lizard species distribution patterns in rainforest environme...
Article
Full-text available
Most species of Amazonian snakes have wide geographic distributions. However, local environmental factors influence the formation of assemblages in different localities. In this study, we investigated the composition of the assemblage and the effect of environmental variables on the distribution of the species inhabiting an upland forest in the Exp...
Article
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The spatial distribution of biodiversity and related processes is the core of Biogeography. Amazonia is the world's most diverse rainforest and the primary source of diversity to several Neotropical regions. The origins of such diversity continue to be an unresolved question in evolutionary biology. Among many competing hypotheses to explain the...
Article
Abstract. Allobates paleovarzensis is a diurnal leaf-litter anuran of the Dendrobatoidea superfamily inhabiting Amazonian forests. Based on behavioral field observations, conducted between 2008–2017 at three localities, we describe the courtship, mating, parental care behavior and territoriality of the species. Vocal activity is more intense in the...
Article
Full-text available
We describe a new small species of Scinax from the rain forests on the interfluve between Purus and Madeira Rivers, Brazilian Amazonia. The new species is diagnosed by snout–vent length 20.2−22.5 mm in males; a yellowish-bronze dorsum showing small spots along the body and limbs; a red stripe horizontally extended on the medial portion of the iris;...
Article
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Nota curto a cerca do primeiro registro de comportamento de combate para perereca-de-vidro (Vitreorana uranoscopa) feito em Cascavel, Paraná, Brasil
Article
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The genus Scinax is one of the most specious genera of treefrogs of the family Hylidae. Despite the high number of potential new species of Scinax revealed in recent studies, the rate of species descriptions for Amazonia has been low in the last decade. A potential cause of this low rate may be the existence of morphologically cryptic species. Desc...
Data
Species of Scinax occurring in Amazonia
Data
Sampling methods for the environmental variables
Data
Morphometric measurements of Scinax ruberoculatus sp. nov. from Purus-Madeira Rivers Interfluve, State of Amazonas, Brazil Abbreviations: (INPA-H) Herpetological Section of the Zoological Collection of the Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil, (RAPELD) sampling sites, (M) male, (F) female, (SVL) snout-vent length, (HL) head l...
Data
Specimens examined for morphological comparisons Abbreviations: (AM) Highway at State of Amazonas, Brazil; (PDBFF) Projeto Dinâmica Biológica de Fragmentos Florestais (a project in Brazil focused on dynamics of forest fragments), (km) kilometre; (INPA-H) Herpetological Section of the Zoological Collection of the Instituto Nacional de Pesquisas da A...
Data
Principal Components resulting from the Principal Component Analyses conducted for the SVL and 15 morphometric ratios from all individuals of Scinax ruberoculatus sp. nov. (males and females) Abbreviations: (PC) Principal Component, (SVL) snout-vent length, (HL) head length, (HW) head width, (ED) horizontal eye diameter, (UEW) upper eyelid width, (...
Article
Full-text available
In polygamous mating systems, it is most often males that compete for the opposite sex, using strategies to provide access to as many females as possible. Females, on the other hand, constitute the sex that exerts the choice and so require a means of accessing the quality of a potential partner in comparison to its competitors. A common challenge i...
Article
Full-text available
In our recent work on the description of the new species of Pristimantis (De Oliveira et al. 2017), some errors that can impair your complete understanding were not noticed in the text. Corrections are as follows
Article
Full-text available
A new tree frog species of the genus Scinax from the interfluve between the Purus and Madeira rivers, Brazilian Amazonia, is described and illustrated. The new species is diagnosed by medium body size, snout truncate in dorsal view, ulnar and tarsal tubercles absent, nuptial pads poorly developed, skin on dorsum shagreen, dorsum light brown with da...
Article
Full-text available
Citation: Oliveira EA de, Rodrigues LR, Kaefer IL, Pinto KC, Hernández-Ruz EJ (2017) A new species of Pristimantis from eastern Brazilian Amazonia (Anura, Craugastoridae) ZooKeys 687: 101–129. https://doi. Abstract.. In this study a new species of Pristimantis (Anura: Craugastoridae) of the P. conspicillatus species group is described. Pristimantis...
Article
Full-text available
Allobates subfolionidificans is a vulnerable and endemic leaf-litter frog from the state of Acre, Brazilian Amazonia. We monitored a population of A. subfolionidificans through regular censuses and mark-recapture of 181 individuals during an entire breeding season to characterize its reproductive behavior. The space use of A. subfolionidificans ind...
Article
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In the Amazon basin, the distribution of many vertebrate species is delimited by large rivers, which are frequently considered as biogeographical barriers strongly related to the origin and maintenance of the elevated biodiversity found in the region. In this study, we conducted a phylogeographical investigation of the effect of the Tapajós River o...