Smooth, striated, or rough: how substrate textures affect the feeding performance of tadpoles with different oral morphologies

Annibale, Fabiane Santana; Sousa, Verônica Thiemi Tsutae de; Sousa, Carlos Eduardo de; Venesky, Matthew D.; Rossa-Feres, Denise C.; Wassersug, Richard J.; Nomura, Fausto

doi:10.1007/s00435-019-00469-x

Cited by 13 publications

(18 citation statements)

References 40 publications

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“…Increasing concentrations of imidacloprid caused malformations of the oral and intestinal structures of the tadpoles. The malformation of oral structures may restrict the growth of the individual and differences in tadpoles’ oral morphology may affect its capacity to acquire food 55 , 56 . The oral structures of these tadpoles consist of labial teeth that are used as food scrapers, and changes in these structures may affect the ability of the tadpoles to forage 55 , 57 , 58 .…”

Section: Discussionmentioning

confidence: 99%

Toxicity and genotoxicity of imidacloprid in the tadpoles of Leptodactylus luctator and Physalaemus cuvieri (Anura: Leptodactylidae)

Samojeden

Pavan

Rutkoski

et al. 2022

Sci Rep

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Imidacloprid is a neonicotinoid insecticide used to control agricultural pests around the world. This pesticide can have adverse effects on non-target organisms, especially in aquatic environments. The present study evaluated the toxicity of an imidacloprid-based insecticide in amphibians, using Leptodactylus luctator and Physalaemus cuvieri tadpoles as study models. Spawning of both species were collected within less than 24 h of oviposition from a non-agricultural land at Erechim, Rio Grande do Sul state, Brazil. Survival, swimming activity, body size, morphological malformations, and genotoxic parameters were analyzed at laboratory conditions. A short-term assay was conducted over 168 h (7 days) with five different concentrations of imidacloprid (3–300 µg L−1) being tested. The insecticide did not affect survival, although the tadpoles of both species presented reduced body size, malformed oral and intestine structures, and micronuclei and other erythrocyte nuclear abnormalities following exposure to this imidacloprid-based compound. Exposure also affected swimming activity in L. luctator, which reflected the greater sensitivity of L. luctator to imidacloprid in comparison with P. cuvieri. The swimming activity, body size, and malformations observed in L. luctator and the morphological malformations found in P. cuvieri indicated that even the lowest tested concentration of the insecticide were harmful to amphibians. At concentrations of over 3 μg L−1, P. cuvieri presents a smaller body size, and both species are affected by genotoxic cell damage. This demonstrates that imidacloprid is potentially toxic for the two study species at environmentally relevant concentrations.

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Section: Discussionmentioning

confidence: 99%

Toxicity and genotoxicity of imidacloprid in the tadpoles of Leptodactylus luctator and Physalaemus cuvieri (Anura: Leptodactylidae)

Samojeden

Pavan

Rutkoski

et al. 2022

Sci Rep

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“…However, competition in tadpoles’ assemblages should be leading not to diet but microhabitat partitioning. New evidence gathered by laboratory experiments suggests that the substrate type, like texture or orientation, could affect tadpole feeding performance and result in differential growth rates and performance (Annibale et al, 2018, 2020). Also, we could use the tadpoles’ oral morphology to predict their feeding efficiency when grazing in different substrate types (Annibale et al, 2018, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…New evidence gathered by laboratory experiments suggests that the substrate type, like texture or orientation, could affect tadpole feeding performance and result in differential growth rates and performance (Annibale et al, 2018, 2020). Also, we could use the tadpoles’ oral morphology to predict their feeding efficiency when grazing in different substrate types (Annibale et al, 2018, 2020). Thus, tadpoles may compete for vegetation zones or substrate types in the aquatic habitat that maximizes their consumption rates.…”

Section: Discussionmentioning

confidence: 99%

Environmental, spatial and biotic factors affect the tadpole distribution in Brazilian savannas

2022

Self Cite

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Multiple factors contribute to explaining the composition and structure of communities, and the niche is still the most used theory to describe how organisms interact with such factors to generate biological communities’ patterns. Both biotic and abiotic aspects of the environment along with the geographic space interact in complex ways with the behavior and physiological tolerance of organisms to structure a community. In this study, we tested the potential effects of the environment, space and competition and assess how the may determine the distribution of tadpoles in aquatic habitats located at Emas National Park. To this end, we sampled 23 aquatic habitats, described their environmental characteristics, recorded their geographic location, and carried out a survey of the tadpoles found. Later, we evaluated the effect of environmental and spatial variables on the distribution of species, through a Partial Redundancy analysis, using matrices of environmental descriptors and geographic location. We found that both environmental and spatial factors drive the distribution and the species composition of the studied assemblages. Also, when we analyzed the pattern of co‐occurrence, we observed that the number of co‐occurrence pairs of species in the Emas National Park is less frequent than expected by chance, suggesting that besides the effect of abiotic components (environmental and spatial factors), competition is a co‐structuring factor in the assemblages of tadpoles. Abstract in portuguese is available with online material.

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“…Interestingly, all 30 tadpoles from British Columbia had a biserial P2 row, which was not found in any of the other 210 Ascaphus individuals. Bifurcation of the tooth row may be related to increased flexibility (Annibale et al, 2020), suggesting a possible functional role, and/or differences in developmental sequences (Altig and McDiarmid, 2001;Vera Candioti et al, 2011;Grosso et al, 2019). Further investigation is needed to determine the geographic extent and underlying cause of the unique P2 bifurcation.…”

Section: Broad Patterns In Labial Tooth Variationmentioning

confidence: 99%

“…These mouthparts play a critical role in feeding by both stabilizing the tadpole during feeding as well as lifting food off of substrates (Wassersug and Yamashita, 2001;Venesky et al, 2010;. Oral morphology can facilitate or constrain feeding on certain substrates (Annibale et al, 2019, Annibale et al, 2020 and damage can lead to decreased feeding efficiency (Venesky et al, 2010). As such, the environment may select for certain morphologies, as has been suggested by the similarity of oral morphologies within some ecological guilds (Altig and McDiarmid, 1999;Altig, 2006;Vera Candioti and Altig, 2010).…”

Section: Introductionmentioning

confidence: 98%

Temperature and development drive variation in oral morphology among tailed frog (Ascaphusspp.) populations

Cicchino

Martinez

Funk

et al. 2020

Preprint

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Anuran tadpoles exhibit extraordinary diversity in mouthpart morphology, reflecting phylogenetic relationships, life history specializations, and ecological adaptations. In this study, we investigate patterns and potential environmental drivers of variation in labial teeth counts across and within the coastal tailed frog (Ascaphus truei) and the Rocky Mountain tailed frog (A. montanus), which together constitute the basal frog family Ascaphidae. Tailed frogs occupy cold, fast-flowing, high gradient streams in mesic forests of western North America, with differences in environmental conditions that reflect their coastal and continental distributions. Despite a very strong relationship between the number of labial teeth and developmental (Gosner) stage, we found significant relationships between tooth counts and site-specific environmental predictors after controlling for stage. The most important environmental predictor varied between the species, with percent canopy cover for A. truei and average benthic substrate size for A. montanus. There were also differences in the overall tooth counts between species, with A. truei having more teeth in all rows compared to A. montanus. These findings demonstrate that differences in oral morphology in response to local environmental conditions can override the homogenizing effects of gene flow in both Ascaphus species, likely through a combination of local adaptation and phenotypic plasticity. Follow-up investigations should include the assessment of community level variability across sites, and experimental tests to confirm functional relationships between environmental variation and oral morphology, in addition to partitioning genetic from plastic mechanisms.

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Smooth, striated, or rough: how substrate textures affect the feeding performance of tadpoles with different oral morphologies

Cited by 13 publications

References 40 publications

Toxicity and genotoxicity of imidacloprid in the tadpoles of Leptodactylus luctator and Physalaemus cuvieri (Anura: Leptodactylidae)

Toxicity and genotoxicity of imidacloprid in the tadpoles of Leptodactylus luctator and Physalaemus cuvieri (Anura: Leptodactylidae)

Environmental, spatial and biotic factors affect the tadpole distribution in Brazilian savannas

Temperature and development drive variation in oral morphology among tailed frog (Ascaphusspp.) populations

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