Verônica Thiemi Tsutae de Sousa

Universidade Federal de Goiás

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Denise de Cerqueira Rossa‐Feres

Universidade Estadual Paulista (Unesp)

Matthew D. Venesky

University of South Florida

Richard J. Wassersug

University of British Columbia

Fausto Nomura

Universidade Federal de Goiás

Gilda Vasconcellos de Andrade

Universidade Federal do Maranhão

Fabiane Santana Annibale

Universidade Federal de Goiás

Tiago Leite Pezzuti

Universidade Federal de Minas Gerais

Carlos Eduardo de Sousa

Universidade Estadual Paulista (Unesp)

Fabrício Barreto Teresa

Universidade Estadual de Goiás

Christopher G. Murphy

State University of New York at Oswego

Cooperative Institutions

Universidade Estadual Paulista (Unesp)

Universidade Federal de Goiás

University of South Florida

Universidade Federal de Mato Grosso do Sul

Centro Universitário de Rio Preto

Instituto de Botânica

University of Memphis

Instituto de Biología Subtropical

Universidade Estadual de Campinas (UNICAMP)

Centro Universitário do Distrito Federal

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Influence of substrate orientation on tadpoles feeding efficiency

Biology Open (2018)

Fabiane Santana Annibale Verônica Thiemi Tsutae de Sousa Carlos Eduardo de Sousa Matthew D. Venesky Denise de Cerqueira Rossa‐Feres

In nature, tadpoles encounter food on substrates oriented at different angles (e.g. vertically along stems, horizontally on the bottom). We manipulated the orientation of food-covered surfaces to test how different orientations of surfaces affect tadpoles’ feeding efficiency. We studied taxa that differed in the oral morphology of their larvae and position in the water column. We hypothesized that species would differ in their ability to graze upon surfaces at different orientations and that differences in the tadpoles’ feeding ability would result in different growth rates for the species. The orientation of food-covered surfaces did not affect the growth rate of species with bottom-dwelling tadpoles (whose growth rate varied only between species). Among species with midwater tadpoles, some appear to have a generalist strategy and experienced a high relative growth rate on numerous substrate orientations whereas others achieved high growth rates only on flat substrates (i.e. at 0° and 180°). We conclude that oral morphology constrains tadpoles’ ability to feed at different substrate orientations, and this could lead to niche partitioning in structurally complex aquatic environments. Because physical parameters of the environment can affect tadpoles’ growth rate, characterizing these features might help us better understanding how competition structures tadpole assemblages.

Tadpole (physics)

10.1242/bio.037598

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Citations (12)

Flexible feeding kinematics of a tropical carnivorous anuran tadpole

Journal of Zoology (2014)

Verônica Thiemi Tsutae de Sousa Fausto Nomura Matthew D. Venesky Denise de Cerqueira Rossa‐Feres Tiago Leite Pezzuti

Abstract L eptodactylus labyrinthicus tadpoles are known predators of anuran eggs and hatchlings, but they are also able to filter‐feed in the water column and scrape food off of firm substrates. We evaluated and compared these alternative feeding behaviors in relation to feeding kinematics and the shape of the mouth with high‐speed digital imaging. We tested the hypotheses that (1) L . labyrinthicus tadpoles use functionally different feeding kinematics when feeding on alternative food sources and (2) that the jaw sheaths of L . labyrinthicus tadpoles deform less during filter‐feeding and substrate grazing compared with more common tadpoles not so specialized for macrophagous carnivory. Our results show that filtering and scraping feeding behaviors differ significantly in both kinematics and shape of the mouth. During filter‐feeding, tadpoles display longer gape cycles and attain a narrower maximum gape earlier in the cycle compared with substrate grazing. Jaw deformation during opening and closing phases of the gape cycle is more pronounced during grazing on firm substrates. This deformation contributes to the achievement of a wider maximum gape during feeding. These differences appear to reflect behavioral adjustments by the tadpoles to maximize food intake. Feeding in tadpoles of L . labyrinthicus is not restrained by their typical carnivorous morphology. On the contrary, L . labyrinthicus tadpoles seem to be opportunistic feeders able to obtain nutrients from a variety of food sources by using different feeding strategies.

Hatchling

Tadpole (physics)

Habit

10.1111/jzo.12135

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Citations (14)

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

Zoomorphology (2019)

Fabiane Santana Annibale Verônica Thiemi Tsutae de Sousa Carlos Eduardo de Sousa Matthew D. Venesky Denise de Cerqueira Rossa‐Feres

Tadpole (physics)

Morphology

10.1007/s00435-019-00469-x

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Citations (16)

Comparative feeding kinematics of tropical hylid tadpoles

Journal of Experimental Biology (2013)

Matthew D. Venesky Denise de Cerqueira Rossa‐Feres Fausto Nomura Gilda Vasconcellos de Andrade Tiago Leite Pezzuti

Anuran larvae, which are otherwise simple in shape, typically have complex keratinized mouthparts (i.e. labial teeth and jaw sheaths) that allow them to graze upon surfaces. The diversity in these structures among species presumably reflects specializations that allow for maximal feeding efficiency on different types of food. However, we lack a general understanding of how these oral structures function during feeding. We used high-speed digital imaging (500 Hz) to observe tadpoles of six species from the anuran family Hylidae grazing on a standardized food-covered substrate. Tadpoles of these species vary in the number of labial tooth rows, belong to two different feeding guilds (benthic and nektonic), and inhabit ponds and streams. We confirmed that the labial teeth in these species serve two functions: anchoring the mouth to the substrate and raking material off of the substrate. In general, tadpoles with a larger maximum gape or those with fewer labial tooth rows opened and closed their mouths slower than tadpoles with smaller gape or more tooth rows. Nektonic feeding tadpoles released each of their tooth rows proportionally earlier in the gape cycle compared with benthic feeding tadpoles. Lastly, we found some support for the idea that deformation of the jaw sheaths during a feeding cycle is predictable based on tadpole feeding guild. Collectively, our data show that anatomical (e.g. number of labial teeth) and ecological features (e.g. feeding guild) of tadpoles significantly influence how tadpoles open and close their mouths during feeding.

Guild

Tadpole (physics)

Nekton

Mandible (arthropod mouthpart)

10.1242/jeb.082040

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Citations (23)

Biomecânica do comportamento alimentar de girinos de anfíbios anuros

Verônica Thiemi Tsutae de Sousa

Individuos de uma mesma especie possuem caracteristicas morfologicas, fisiologicas e comportamentais que determinam quando e onde eles poderao existir e como interagirao com individuos de outras especies. A diversidade ecomorfologica de girinos de anfibios anuros os tornam otimos organismos de estudo, ja que os padroes de uso de recursos (ecologia) e as relacoes filogeneticas entre as especies podem ser inferidas a partir das propriedades fenotipicas. A influencia de fatores contemporâneos sobre a estrutura das comunidades de girinos tem sido intensamente estudada ha decadas, mas os padroes de uso e partilha de recursos alimentares nao tem recebido a mesma atencao dos pesquisadores. Pouco se sabe sobre a ecologia e o comportamento alimentar dos girinos, incluindo a biomecânica do comportamento alimentar, a influencia de fatores abioticos sobre o comportamento alimentar, alem da plasticidade comportamental exibida pelos girinos na exploracao dos recursos alimentares. Estas questoes foram investigadas durante o Doutorado e os resultados do trabalho durante ao longo deste periodo sao apresentados na presente tese, que compreende tres capitulos. No primeiro, verificamos se o girino carnivoro de Leptodactylus labyrinthicus ajusta seu comportamento alimentar para maximizar o consumo de alimento obtido a partir de fontes alimentares alternativas. Os resultados indicam que, dependendo da fonte alimentar a ser explorada, os girinos podem adotar comportamentos alimentares distintos: para consumir alimentos disponiveis em suspensao na agua, os girinos exibem o comportamento de filtracao; ja para consumir alimentos aderidos em superficies submersas, os girinos utilizam o comportamento de raspagem. Tais comportamentos alimentares sao discerniveis com relacao as suas cinematicas e aos formatos que o disco oral assume durante a alimentacao por filtracao e por raspagem. No segundo, testamos a 13 hipotese de que mudancas na temperatura media da agua teriam efeitos diferenciais sobre o comportamento alimentar de girinos de duas especies de anuros: Rhinella schneideri, que possui girinos bentonicos, e Trachycephalus typhonius, cujos girinos sao nectonicos. Os resultados indicam que a temperatura afeta a cinematica do comportamento alimentar de raspagem. No entanto, devido a interacao entre especie e temperatura, o efeito da temperatura sobre as variaveis cinematicas pode nao produzir uma variacao no mesmo sentido. Finalmente, no terceiro capitulo, nosso objetivo foi o de verificar se a influencia dos fatores ecologicos e morfologicos sobre o comportamento alimentar dos girinos reflete as relacoes filogeneticas entre as especies.

Food habits

Food supply

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Predation risk and jumping behavior in Pseudopaludicola aff. falcipes tadpoles

Behavioral Ecology (2011)

Verônica Thiemi Tsutae de Sousa Fabrício Barreto Teresa Denise de Cerqueira Rossa‐Feres

Tadpoles of Pseudopaludicola aff. falcipes are capable of jumping out of small temporary puddles where they occur. In this system, odonate naiads are the main predators. Considering the hypothesis that jumping behavior represents an antipredator tactic, we addressed the following predictions: 1) tadpoles will jump more frequently from puddles with predators than from puddles without predators; 2) tadpole mortality will increase if tadpoles are prevented from jumping; 3) it would be more common to find tadpoles in puddles where predators are absent; and 4) predator and prey coexistence would be more probable in large puddles than in small ones. To test predictions 1) and 2), we conducted 2 laboratory experiments. In Experiment 1, we evaluated the jump frequency of tadpoles in 3 treatments (tadpoles in the presence or absence of a predator, or using an inanimate object as predator presence control). In Experiment 2, we compared tadpole survival in 2 conditions: Tadpoles were allowed or not to jump. To test predictions 3) and 4), we conducted a field study to determine how predators and prey are distributed throughout the habitat. Experiments demonstrated that jumping behavior occurred more frequently when a predator was present and that tadpoles prevented from jumping were more susceptible to predation. The field study indicated that tadpoles and odonate naiads were distributed in a negatively associated, but puddle-size dependent pattern. Our results are congruent with the predictions, therefore, confirming the jumping behavior as an effective antipredator tactic.

Tadpole (physics)

10.1093/beheco/arr072

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Citations (8)

Geographic Variation in the Acoustic Signals of Dendropsophus nanus (Boulenger 1889) (Anura: Hylidae)

Herpetologica (2020)

Fabiane Santana Annibale Verônica Thiemi Tsutae de Sousa Fernando Rodrigues da Silva Christopher G. Murphy

Anurans communicate information during breeding activity to conspecifics mainly through acoustic signals, and different evolutionary forces may produce geographic variation in such communication systems. To understand which variables influenced geographic variation in the advertisement call of Dendropsophus nanus, a generalist species with a broad distribution in South America, we tested three nonexclusive hypotheses: geographic distance, environmental temperature, and body size. The advertisement call of this species consists of two note types: Type A, which functions in spacing among males in aggregations, and Type B, which may influence female choice. To determine the effect of the three explanatory variables on each note, we sampled nine populations in central and southern Brazil. We found that geographic distance and temperature were the main variables explaining variation in both notes. An exploratory analysis revealed differences in the advertisement call between populations in western and eastern localities. Because temperature was spatially structured, geographic distance may have produced variation in temperature along the longitudinal gradient, resulting in the observed variation in bioacoustic parameters among populations. Also, we observed that individuals in warmer localities were smaller than those from colder localities, and this difference in body size was correlated to the note repetition rate of Type A notes. Our findings indicate that variation in acoustic parameters may be an indirect result of temperature acting on body size. Thus, geographic variation in the advertisement call of D. nanus may be due to both neutral and selective processes.

Geographic variation

Variation (astronomy)

Hylidae

Geographical distance

10.1655/herpetologica-d-19-00046.1

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Citations (5)

Differential effects of temperature on the feeding kinematics of the tadpoles of two sympatric anuran species

Journal of Experimental Zoology Part A Ecological Genetics and Physiology (2015)

Verônica Thiemi Tsutae de Sousa Fausto Nomura Denise de Cerqueira Rossa‐Feres Gilda Vasconcellos de Andrade Tiago Leite Pezzuti

ABSTRACT Temperature impacts ectotherm performance by influencing many biochemical and physiological processes. When well adapted to their environment, ectotherms should perform most efficiently at the temperatures they most commonly encounter. In the present study, we tested how differences in temperature affects the feeding kinematics of tadpoles of two anuran species: the benthic tadpole of Rhinella schneideri and the nektonic tadpole of Trachycephalus typhonius . Benthic and nektonic tadpoles have segregated distributions within ponds and thus tend to face different environmental conditions, such as temperature. Muscle contractile dynamics, and thus whole organism performance, is primarily temperature dependent for ectotherms. We hypothesized that changes in mean temperatures would have differential effects on the feeding kinematics of these two species. We conducted a laboratory experiment in which we used high‐speed videography to record tadpoles foraging at cold and warm temperatures. In general, tadpoles filmed at warm temperatures opened their jaws faster, attained maximum gape earlier, and exhibited shorter gape cycles than tadpoles in cold temperatures, irrespective of species. We also found species x temperature interactions regarding the closing phase velocity, and the percentage of time it takes tadpoles to achieve maximum gape and to start closing their jaws. These interactions could indicate that these two co‐occurring species differ in their sensitivity to differences in water temperature and have temperature‐dependent feeding strategies that maximize feeding performance in their preferred environment. J. Exp. Zool. 323A: 456–465, 2015 . © 2015 Wiley Periodicals, Inc.

Ectotherm

Tadpole (physics)

Nekton

10.1002/jez.1941

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Citations (5)

Efeitos do canto de anúncio e do tamanho corporal no espaçamento entre machos em agregações de Dendropsophus nanus (Anura, Hylidae)

Aleph UCLA Undergraduate Research Journal for the Humanities and Social Sciences (2012)

Verônica Thiemi Tsutae de Sousa

Hylidae

Canto

Source

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