Seasonal Food Habits of Anolis Limifrons

Sexton, Owen J.; Bauman, Joan E.; Ortleb, Edward P.

doi:10.2307/1935727

Cited by 63 publications

(42 citation statements)

References 11 publications

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“…Diferenças sexuais na dieta foram observadas por SEXTON et al (1972), SCHOENER et al (1982) e BARDEN & SHINE (1994) e na estratégia de caça por SEXTON et al (1972) e PARMELEE & GUYER (1995 e no presente estudo. A maior ocorrência de formigas e a presença de outros artrópodos considerados ativos (como Lepidoptera) na dieta de fêmeas de E. perditus, corresponde mais ao padrão básico de forrageamento senta-e-espera postulado por PIANKA (1986), uma vez que a maioria das formigas ingeridas era operária, sendo possível que estas tenham sido capturadas pelos lagartos nas trilhas de forrageamento.…”

Section: Resultsunclassified

“…Estas diferenças são sugeridas por alguns autores como resultantes da redução de competição intersexual (SCHOENER, 1967;SEXTON et al, 1972;FLOYD & JENSSEN, 1983;BARDEN & SHINE, 1994), ou diferenças morfológicas (SCHOENER, 1967;FITCH, 1981) e/ou fisiológicas entre os sexos (BARDEN & SHINE, 1994;DURTSCHE, 1995). A variação intraespecífica na dieta pode ocorrer também entre lagartos adultos e jovens ( VAN SLUYS, 1993;FLOYD & JENSSEN, 1983;DUFFIELD & BULL, 1998;ROCHA, 1998ROCHA, , 1999, podendo resultar em diferentes comportamentos de forrageamento (BULLOCK et al, 1993;DUFFIELD & BULL, 1998).…”

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Hábitos alimentares de Enyalius perditus (Squamata, Leiosauridae) no Parque Estadual do Ibitipoca, Minas Gerais, Brasil

Sousa

Cruz²

2008

Iheringia, Sér. Zool.

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ABSTRACT. Feeding habits of Enyalius perditus (Squamata, Leiosauridae) from the Parque Estadual do Ibitipoca, Minas Gerais, Brazil. The present study was carried out to describe the diet, and its variations according to food availability, in Enyalius perditus Jackson, 1978 from Parque Estadual do Ibitipoca, State of Minas Gerais, Brazil. Three areas were chosen in the forest fragments; pit falls and glue traps were used to capture lizards and their preys. Lizards (n=55) were dissected in order to analyze the stomach content. The Electivity Index showed that insect larvae were volumetrically important in the diet of E. perditus, while ants and woodlices where numerically important. The quantity of diet items have differed significantly between males and females, perhaps, as a consequence of the higher quantity of ants ingested by female lizards and larvae ingested by males lizards. Based upon alimentary behavior, the male lizards resemble the active forragers and the females sit and wait forragers. KEYWORDS.Leiosauridae, Enyalius perditus, ecology, behavior, diet. RESUMO.No presente estudo foi analisado a dieta de Enyalius perditus Jackson, 1978 e suas variações de acordo com disponibilidade de alimento no Parque Estadual do Ibitipoca, Minas Gerais, Brasil. Três áreas de matas foram amostradas, utilizando-se armadilhas de queda e adesivas para captura dos lagartos e itens-presa disponíveis. Os lagartos (n= 55) foram dissecados e o conteúdo estomacal analisado. O Índice de eletividade mostrou que larvas foram importantes volumetricamente na dieta de E. perditus, enquanto que formigas e isópodos foram importantes numericamente. A quantidade de itens nas dietas de machos e fêmeas diferiram estatisticamente, talvez como uma conseqüência da maior quantidade de formigas ingeridas pelas fêmeas e isópodos e larvas pelos machos. Baseado no comportamento alimentar, os machos são mais semelhantes aos forrageadores ativos e as fêmeas, aos predadores senta-e-espera.

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Section: Resultsunclassified

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Hábitos alimentares de Enyalius perditus (Squamata, Leiosauridae) no Parque Estadual do Ibitipoca, Minas Gerais, Brasil

Sousa

Cruz²

2008

Iheringia, Sér. Zool.

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“…1 and 3), but still took some insects as small as 3 mm. These small insects are much more abundant than larger prey in most terrestrial habitats (Sexton et al 1971, Dickman 1988a. They are probably included in the diet because, once captured, they can be ingested rapidly and provide a small profit, and do not decrease the probability of encountering larger and more profitable prey.…”

Section: Discussionmentioning

confidence: 99%

Body Size‐Prey Relationships in Insectivorous Marsupials: Tests of Three Hypotheses

Fisher¹,

Dickman²

1993

Ecology

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There is a strong positive correlation between the body sizes of dasyurid marsupials and the mean sizes of the invertebrate prey. This study tests three hypotheses proposed to explain this relationship, using 21 species of dasyurids (body mass range: 5–200 g) throughout continental Australia: (1) the maximum prey size that can be physically handled increases with dasyurid size due to the restricted gapes of forces of biting of smaller dasyurids; (2) the prey size that maximizes rate of energy intake varies with dasyurid size, with animals preferentially consuming the most profitable prey; and (3) prey sizes encountered during foraging vary with dasyurid size. Field observations of dasyurids were made at 20 study areas between January 1980 and February 1991. Most dasyurids were live—trapped, weighed, and sexed before being released at the trap site. We then tracked each animal and sampled potential prey in their foraging microhabitats. Dasyurids diets were examined using scats analysis. We measured rate of energy intake for captive dasyurids by offering different—sized cockroaches, measuring processing times, and calculating the energy content of cockroaches used. The first hypothesis was rejected. Both large and small dasyurids could grasp and pierce the largest prey offered in the laboratory, which were similar in size to the largest prey potentially available in the field. The second and third hypotheses were supported. Individuals of the smaller species maximized rates of energy gain in captivity by feeding preferentially on small prey, and their foraging trails in the field traversed microhabitats where mean potential prey size encountered was small (2–4 mm long). In contrast, larger dasyurids preferred large prey, obtained a greater rate of energy gain from them, and foraged in microhabitats where prey lengths averaged @>6 mm. There was a tendency for larger dasyurids to include progressively larger prey in their diets than were available, on average, along their foraging trails. This may reflect increasing selectivity for larger prey. However, it may also reflect a reduced susceptibility to predation on increased competitive ability for large dasyurids in productive microhabitats, and hence reflect a size—based advantage in encountering large prey. These results indicate that net energy yield and the use of microhabitats with different prey sizes are the most important determinants of the body size—prey size relationship in dasyurid marsupials.

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“…1979]. However, the spe cific relationships between prey size, type and structural habitat are not well-de fined, despite a number of studies which have described differences between spe cies [Schoener, 1967[Schoener, , 1972Sexton et al, 1972;Andrews, 1971;Fleming and Hooker, 1975].…”

Section: Discussionmentioning

confidence: 99%

Bifoveal Vision in Anolis Lizards

Fite

Lister

1981

Brain Behav Evol

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The retinas of 14 ecologically diverse species of Anolis lizards have been examined neuroanatomically. Both central and temporal foveas were observed in each eye of all species; however, the two foveas differed with regard to a number of structural and morphological characteristics. All central foveas were deep and convexiclivate, while temporal foveas were shallower and more variable both in shape and retinal location across species. Central foveas had higher cell densities and a broader foveal clivus than did temporal foveas, both within and across species. As eye size increased across species, densities of receptor nuclei per visual degree² (vis.deg.²) increased more rapidly than did ganglion cell densities/vis.deg.² in the central fovea. In contrast, both cell types increased at approximately the same rate in the temporal fovea as eye size increased. Several of these relationships have been previously reported for diurnal birds of prey, which are also bifoveate. Analysis of stomach contents revealed that Anolis species which feed upon small prey items have temporal foveas with a relatively deep clivus. Foveal characteristics may influence both species typical foraging behaviors and the type of prey which can be effectively utilized by a given species.

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Seasonal Food Habits of Anolis Limifrons

Cited by 63 publications

References 11 publications

Hábitos alimentares de Enyalius perditus (Squamata, Leiosauridae) no Parque Estadual do Ibitipoca, Minas Gerais, Brasil

Hábitos alimentares de Enyalius perditus (Squamata, Leiosauridae) no Parque Estadual do Ibitipoca, Minas Gerais, Brasil

Body Size‐Prey Relationships in Insectivorous Marsupials: Tests of Three Hypotheses

Bifoveal Vision in Anolis Lizards

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