Anuran community composition along two large rivers in a tropical disturbed landscape

Almeida‐Gomes, Mauricio; Rocha, Carlos Frederico Duarte; Vieira, Marcus Vinícius

doi:10.1590/s1984-46702015000100002

Cited by 7 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present study, we investigated the effects of two main influential determinants—meal size and temperature—on the postprandial metabolic response of a Neotropical frog, Leptodactylus latrans (STEFFEN 1815). This species is widely distributed in South America (Frost, ; Heyer et al, ), where it occupies various habitats, such as dense forests, open savannahs, and human altered environments, but always in close association with bodies of water (Almeida‐Gomes, Rocha, & Vieira, ; Bolzan, Saccol, & Santos, ; Brasileiro, Sawaya, Kiefer, & Martins, ). L. latrans grows up to 10 cm SVL and feeds upon a broad range of prey types and sizes, including various invertebrates and small vertebrates, such as fishes, rodents, and other anurans (see França et al, ; Mendes, Ruas, & Solé, ; Pinto, Lima, & Brandão, ; Solé et al, ; Teixeira & Vrcibradic, ).…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature and meal size on the postprandial metabolic response of Leptodactylus latrans (Anura, Leptodactylidae)

2019

View full text Add to dashboard Cite

The postprandial increment of metabolism, often referred to as specific dynamic action (SDA), encompasses the summed costs of meal ingestion, digestion, absorption, and assimilation. Different SDA parameters, such as its magnitude, duration, and relative cost, are affected by a diverse set of environmental and physiological determinants, including meal size and body temperature. While the influence of these variables has been thoroughly examined in most ectothermic vertebrate groups, few studies have focused on the determinants and consequences of the SDA response in anuran amphibians. Thus, we examined the effects of meal size and body temperature on the SDA response of a Neotropical frog, Leptodactylus latrans, by measuring the rates of oxygen consumption of frogs while fasting and after being fed meals of different sizes at different temperatures. SDA lasted from 3 to 5 days and increased with meal size for frogs fed meals equivalent to 5-15% of their body mass. SDA cost was not affected by meal size and averaged 14.6% of the caloric content of the meal. Temperature increment was accompanied by proportional increases in metabolic rateand shorter SDA duration. The relative SDA cost averaged 14.8% of the meal caloric content at 20°C and 25°C, but increased to 23.5% at 30°C. Our results indicate that meal size imposes no physiological or energetic constraint to L. latrans feeding.Digestion at temperatures near the thermal preference of the species seems to optimize energetic return, whereas the shortening of SDA duration at higher temperatures may provide significant ecological advantages. K E Y W O R D Sanurans, digestion, energetics, meal size, postprandial metabolic increment, temperature

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of temperature and meal size on the postprandial metabolic response of Leptodactylus latrans (Anura, Leptodactylidae)

2019

View full text Add to dashboard Cite

show abstract

“…Minimising these risks, many diurnal frogs are associated with streams and shallow rivulets inside the forests where the aquatic environment, including the water spray, provides the needed humidity to survive (Wells 2007). This stream association present in many diurnal frogs markedly affects their occurrence and distribution in space, resulting in a reduced occupancy area that is usually restricted to the channel of streams and their adjacent portions, rarely reaching all regions of the forest (Rowley and Alford 2007;Almeida-Gomes et al 2015).…”

Section: Introductionmentioning

confidence: 99%

“…This stream association present in many diurnal frogs markedly affects their occurrence and distribution in space, resulting in a reduced occupancy area that is usually restricted to the channel of streams and their adjacent portions, rarely reaching all regions of the forest (Rowley and Alford 2007; Almeida-Gomes et al . 2014; Almeida-Gomes and Rocha 2014; Almeida-Gomes et al . 2015).…”

Section: Introductionmentioning

confidence: 99%

Factors influencing fine-scale occupancy and detectability of an insular Atlantic Forest frog

et al. 2023

View full text Add to dashboard Cite

Context Species of the tropical frog Family Hylodidae tend to be restricted to streams and, hence, have a small occupancy area. Hylodes fredi (Canedo and Pombal 2007), a diurnal stream-dwelling species endemic to the Atlantic Forest in Ilha Grande, south-eastern Brazil, is one such species. Because of scarce population studies, it is also categorised as Data Deficient (DD) in the IUCN Red List. Previous studies on the habitat use by this species did not account for imperfect detection, which could have led to biased results. Aims We aimed to systematically describe the microhabitats occupied by H. fredi, by generating a fine-scale occupancy model while accounting for imperfect detection. Methods We sampled six streams where the species is known to occur. Perpendicular transects were established in each stream and further subdivided into 10 sampling plots. Single-species and single-season occupancy models were created with the UNMARKED R package, and model selection was performed on the basis of the Akaike information criterion. Key results We observed the species in 70 of the 275 sampled sites, which resulted in a naïve occupancy of 0.28 and detectability of 0.25. The best models suggest that H. fredi occupancy increases positively with rock cover and inversely with leaf-litter cover. Detectability reduced with an increase in leaf litter cover and varied with the air temperature. Conclusions We conclude that H. fredi occupancy is affected by the presence of rock and leaf-litter cover. The data indicated that the species is restricted to the stream channel and does not seem to occupy forested areas that are distanced from the stream margins. Implications Considering that H. fredi and many other congeneric species are listed as ‘Data Deficient’ in the IUCN Red List, it is important to define a threat category so as to conserve them. Many stream-associated species tend to have their occupancy overestimated, leading to an underestimation of their threat risk. This study systematically demonstrated that H. fredi has a strict and reduced occupancy, mostly limited to the stream margins, that should be considered when determining conservation efforts for this and ecologically similar species.

show abstract

Seasonal Habitat Preferences and Response to Water Quality Parameters of Tree Frog Species in a Neotropical Wetland

et al. 2021

View full text Add to dashboard Cite

Anuran community composition along two large rivers in a tropical disturbed landscape

Cited by 7 publications

References 22 publications

Effects of temperature and meal size on the postprandial metabolic response of Leptodactylus latrans (Anura, Leptodactylidae)

Effects of temperature and meal size on the postprandial metabolic response of Leptodactylus latrans (Anura, Leptodactylidae)

Factors influencing fine-scale occupancy and detectability of an insular Atlantic Forest frog

Seasonal Habitat Preferences and Response to Water Quality Parameters of Tree Frog Species in a Neotropical Wetland

Contact Info

Product

Resources

About