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16 results on '"Nunes, Lucas T."'

1. Megahabitats shape fish distribution patterns on the Amazon coast

Author

Marceniuk, Alexandre Pires, Soares, Bruno Eleres, Caires, Rodrigo Antunes, Carvalho-Filho, Alfredo, Barthem, Ronaldo, Floeter, Sergio Ricardo, Rosa, Ricardo de Souza, Klautau, Alex Garcia Cavalleiro de Macedo, Cintra, Israel Hidenburgo Aniceto, Rotundo, Matheus Marcos, and Nunes, Lucas T.

Published
2024
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7. Diel feeding activity of Abudefduf saxatilis on southwestern Atlantic reefs

Author

Nunes, Lucas T, Leão, Caroline C, Floyd, Alexander A, Sazima, Ivan, Ferreira, Carlos E L, and Floeter, Sergio R

Subjects
Trophic ecology, Rocky reef, Reef fish, Pomacentridae, Fish behaviour
Abstract

Feeding ecology studies are crucial for understanding energy flow in reef ecosystems. In this study, we used an integrative approach to investigate the diel-feeding ecology of the sergeant-major Abudefduf saxatilis. To examine the possibility of diel-periodicity and size-class differences in foraging behaviour, we tracked fish individuals until their first bite on two subtropical reefs. During each observation, we recorded the substratum that was bitten and estimated the individual's total length. To assess the diet, we analysed the stomach contents of five individuals from each location. In total, we observed 2703 individuals biting seven substrates. Our results showed no significant differences in substrate use for diel-periodicity. However, we found significant differences between classes 2 and 4. Despite this, both populations tended to forage near the surface in the water column in the morning and on the benthos in the afternoon, although this tendency was not statistically significant. Smaller individuals fed mostly in the water column, while larger individuals foraged on all substrates, likely due to their different energetic demands. Our findings indicate this species has an omnivorous, generalist diet, comprising 12 items from both benthos and plankton. The lack of differences in diel-periodicity is likely due to the fish's opportunistic behaviour.

Published
2023
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8. TimeFISH : Long‐term assessment of reef fish assemblages in a transition zone in the Southwestern Atlantic

Author

Quimbayo, Juan P., primary, Nunes, Lucas T., additional, Silva, Fernanda C., additional, Anderson, Antônio B., additional, Barneche, Diego R., additional, Canterle, Angela M., additional, Cord, Isadora, additional, Dalben, Andrea, additional, Ferrari, Débora S., additional, Fontoura, Luisa, additional, Fiuza, Thiago M. J., additional, Liedke, Ana M. R., additional, Longo, Guilherme O., additional, Morais, Renato A., additional, Siqueira, Alexandre C., additional, and Floeter, Sergio R., additional

Published
2023
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16. Resource partitioning by two syntopic sister species of butterflyfish (Chaetodontidae).

Author

Liedke, Ana M.R., Bonaldo, Roberta M., Segal, Bárbara, Ferreira, Carlos E.L., Nunes, Lucas T., Burigo, Ana P., Buck, Sonia, Oliveira-Santos, Luiz Gustavo R., and Floeter, Sergio R.

Abstract

Resource partitioning is considered one of the main processes driving diversification in ecological communities because it allows coexistence among closely related and ecologically equivalent species. We combined three complementary approaches, i.e. the evaluation of foraging behaviour, diet composition and nutritional condition (RNA:DNA ratio), to assess feeding by two closely related (sister) butterflyfishes that are syntopic in Puerto Rico. Chaetodon capistratus had a higher abundance and higher bite rate and selected octocorals and hard corals for feeding, whereas Chaetodon striatus fed preferentially on sandy substrates. Cnidarians and polychaetes were the most representative diet items for both species, but C. capistratus preferred the former (Feeding Index of 74.3%) and C. striatus the latter (Feeding Index of 60.4%). Similar RNA:DNA ratios for both species suggest that, although they differ in feeding rates and diet, C. capistratus and C. striatus have similar nutritional fitness. Therefore, these species are both zoobenthivores but show clear differences in their substrate selection. The differences in the use of foraging substrate by C. capistratus and C. striatus , despite their close phylogenetic relationship and similar diets, suggest that these species coexist by resource partitioning. [ABSTRACT FROM AUTHOR]

Published
2018
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