Predation by lizards as a mortality source for juvenile lizards in Brazil

Siqueira, Carla da Costa; Rocha, Carlos Frederico Duarte

doi:10.2994/1808-9798(2008)3[82:pblaam]2.0.co;2

Cited by 15 publications

(12 citation statements)

References 22 publications

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“…Thus, we propose the following informed hypothesis about seasonal variation in the vital rates of juveniles of our 3 study species. First, juvenile survival should be lower than adult survival, with an evident decrease also during the cold-dry season, such as has been observed in other lizard species (Civantos et al 1999;Siqueira & Rocha 2008). Second, recruitment of juveniles should be highest right after parturitions take place; that is, at the end of the warm-dry season and at the beginning of the rainy season ( Fig.…”

Section: Caveats and Future Directionsmentioning

confidence: 71%

Population dynamics of three lizard species from the genus Sceloporus: short‐term changes in demographic parameters

Vargas‐García

Argáez

Solano‐Zavaleta

et al. 2019

Integrative Zoology

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Most demographic studies focus on numerical changes that occur within populations across years. However, typically studies at an interannual scale do not provide information on the particular times of the year (particular months or seasons) when rates of survival, recruitment, or migration increase or decrease due to physiological, behavioral or ecological processes. These monthly or seasonal changes in demographic parameters may lead to substantial variations in population abundance. In this study, we collected capture–mark–recapture data on 3 species of lizards of the genus Sceloporus (Sceloporus torquatus, Sceloporus grammicus and Sceloporus megalepidurus) found in ecologically similar habitats to examine potential changes in demographic rates among 3 different climatic seasons: rainy, cold‐dry and warm‐dry seasons. We tested different hypotheses about the effect of these seasons on survival, recruitment of new adults, and temporary emigration. We found that during the season with severe thermal constraints, the cold‐dry season, survival of S. torquatus decreased markedly. We also detected a considerable increase in the recruitment rate of S. grammicus during the rainy season, when these lizards are establishing territories and finding mates. In contrast, we found no evidence of intra‐annual changes in the rate of temporary emigration. In addition, we calculated abundance and population growth rates for each species and for each season. Our study represents a significant contribution to the understanding of intra‐annual demographic variation in lizards.

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Section: Caveats and Future Directionsmentioning

confidence: 71%

Population dynamics of three lizard species from the genus Sceloporus: short‐term changes in demographic parameters

Vargas‐García

Argáez

Solano‐Zavaleta

et al. 2019

Integrative Zoology

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“…Tropidurus hispidus is one of the largest species of the torquatus group (Rodrigues 1987, Freitas & Silva 2005, whilst T. jaguaribanus is the largest one of the semitaeniatus group (Passos et al 2011, Passos et al 2013. In general, juvenile lizards are more susceptible to predation in both saurophagic and cannibalistic interactions (Siqueira & Rocha 2008). Their smaller relative size compared to adults, their higher relative abundance as well the lack of experience in avoid predators may explain this trend (Vitt 2000).…”

Section: Discussionmentioning

confidence: 99%

“…In context of lizards, the predation by a sympatric lizard and even by the same species represent two important sources of mortality (Vitt 2000, Siqueira & Rocha 2008. At first glance, the incidence of these kind of predatory events appeared to be infrequent, but cases of saurophagy and cannibalism among lizards are increasingly documented (Pincheira-Donoso 2012, Robbins et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Dangerous neighborhood: saurophagy between syntopic Tropidurus lizards

2016

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Saurophagy constitutes an important source of mortality among lizards and has been reported for the genus Tropidurus. However, the extension of this behavior remains unknown. Herein, we record the predation of T. jaguaribanus by its congener T. hispidus. This is the first report of saurophagy among different species of syntopic Tropidurus. Furthermore, whereas published records of saurophagy tend to be directed against juveniles, this case involved two adult individuals. Keywords: Predation, mortality, agonistic interactions, Tropiduridae, Caatinga. Resumo: A saurofagia constitui uma importante fonte de mortalidade entre lagartos e tem sido reportada para o gênero Tropidurus. Contudo, a extensã o deste comportamento permanece desconhecida. Neste estudo registramos a predac¸ão de T. jaguaribanus por seu congênere T. hispidus. Este é o primeiro caso de saurofagia entre diferentes espécies de Tropidurus sintó picos. Além disso, embora a saurofagia tenda a ser direcionada contra jovens, este caso envolveu dois indivíduos adultos.

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“…On the other hand, examples of male-biased cannibalism have also been shown in a number of animals, ranging from invertebrates to vertebrates (Rotary and Gerling, 1973;Hrdy, 1979;Polis, 1981;Gray et al, 2007). Interestingly, in a recent multilineage study on lizard saurophagy, Siqueira and Rocha (2008) showed that male cannibalism is predominant when males are bigger than females (male-biased sexual size dimorphism), while it is restricted to females when sexual dimorphism is female-biased. This is the case in Liolaemus.…”

Section: Discussionmentioning

confidence: 99%

“…As a generality, it seems to be that larger body size tends to facilitate intraspecific predation (Polis, 1981;Pough et al, 2004;Siqueira and Rocha, 2008). Cannibalism may result from large body size or large body size may result from the need to access a higher diversity of food items, including juvenile conspecifics.…”

Section: Discussionmentioning

confidence: 99%

Intraspecific predation in the Liolaemus lizard radiation: a primer

Pincheira‐Donoso

2012

Animal Biol

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Intraspecific predation (cannibalism) occurs in a number of lizard species, although the incidence of this trophic behaviour appears to be infrequent. Within the South American Liolaemus lizard evolutionary radiation, the primary component of the carnivorous diet (herbivory has also evolved in several species) includes a diversity of arthropods and other invertebrates. However, a number of cases of saurophagy, mostly cannibalism, have also been reported in different species. Here, I review for the first time the occurrence of cannibalism in this prominent group of lizards, one of the largest and more ecologically diverse living adaptive radiations. Adults of five Liolaemus species have previously been reported to feed on conspecific hatchlings, and one additional case (L. zapallarensis) is reported in this paper. In general, cannibalism is found in species located at the right side of the body size frequency distribution, while no cases have been reported on the far left range of body sizes, suggesting that cannibalism is more common in large species. Only one species of medium size (L. darwinii) is known to feed on conspecifics. In addition, males are responsible for 83% of the cases of cannibalism, while only one case of female cannibalism is known (L. chiliensis). Finally, no clear phylogenetic signal can be inferred from these observations, as the six reported cannibal species belong to four of the five main Liolaemus clades.

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Predation by lizards as a mortality source for juvenile lizards in Brazil

Cited by 15 publications

References 22 publications

Population dynamics of three lizard species from the genus Sceloporus: short‐term changes in demographic parameters

Population dynamics of three lizard species from the genus Sceloporus: short‐term changes in demographic parameters

Dangerous neighborhood: saurophagy between syntopic Tropidurus lizards

Intraspecific predation in the Liolaemus lizard radiation: a primer

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