Dispersão de sementes de Copaifera arenicola (Caesalpinioideae-Fabaceae) por formigas cortadeiras em remanescentes de Caatinga

Gama, Dráuzio Correia; Oliveira, Favízia Freitas de; Garcia, Caroline Tito; Nascimento, José Monteiro

doi:10.34062/afs.v6i4.6339

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Copaifera arenicola [(Ducke) Costa & Queiroz] is a medium‐sized tree (height between 3 and 10 m) with an erect trunk. The species is endemic to semi‐arid regions of the Cerrado and Caatinga domains, occurring on sedimentary soil and usually in anthropized areas (Fagundes et al, 2022; Gama & Nascimento Junior, 2019).…”

Section: Methodsmentioning

confidence: 99%

Contrasting patterns of host selection and performance of insect seed predators on three sympatric host plant species

Fagundes,

Fernandes,

Neves

et al. 2023

Ecological Entomology

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Characterising host selection mechanisms and the performance of seed‐predating insects on different hosts has broad implications for ecology and applied entomology. We assessed host selection and performance of endophagous seed‐predating insects on three species of Copaifera, testing two hypotheses: (i) large‐sized trees produce larger seeds and have higher levels of seed predation than their smaller congeneric relatives, and (ii) endophagous seed‐predating insects that develop in larger‐seeded trees exhibit higher body mass, lipid content, and muscle mass as they obtain higher amount of food resources. Unpredated seeds of the large‐sized Copaifera langsdorffii showed greater mass than their smaller congeneric relatives C. arenicola and C. oblongifolia. Two species of endophagous seed‐predating beetles (Rhinochenus brevicollis and Apion sp.) were found attacking seeds of the three Copaifera species. Rhinochenus brevicollis preyed on a higher percentage of seeds than Apion sp. The shrub C. oblongifolia had the highest percentage of seed predation, contradicting our original hypothesis that larger species have a higher percentage of seed predation. Rhinochenus brevicollis preyed on a higher percentage of seeds of larger‐sized species than Apion sp. The higher dispersal ability of R. brevicollis associated with different patterns of plant species distribution may be the mechanism driving differential seed predation among Copaifera species. Adult insects that emerged from C. langsdorffii seeds showed higher body mass and lipidic content. It is likely that insects developing in larger seeds obtain a higher amount of food resources during their development. Finally, we observed a positive relationship between body weight and lipidic content in adults of R. brevicollis. We suggest that studies shedding light onto insect performance in different host‐sized seeds are necessary to understand host selection by beetles.

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Section: Methodsmentioning

confidence: 99%

Contrasting patterns of host selection and performance of insect seed predators on three sympatric host plant species

Fagundes,

Fernandes,

Neves

et al. 2023

Ecological Entomology

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Seed germination of a myrmecochorous plant endemic to the Brazilian semiarid region: the wolf is not so bad

et al. 2022

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Studies about seed dispersal and germination are important to understand patterns of plant distribution and abundance, and help establish strategies for environmental conservation. We evaluated the role of two different dispersers, the ant Atta laevigata and the maned wolf Chrysocyon brachyurus, in the germination of Copaifera arenicola seeds, a characteristically myrmecochorous plant species. Germination was evaluated for seeds subjected to four treatments: (1) seeds manipulated by the ant, (2) seeds ingested by the maned wolf, (3) seeds that had the elaiosome removed manually, and (4) seeds with elaiosome (unmanipulated seeds). Seeds manipulated by the ant and seeds that had the elaiosome removed manually required less time to germinate and had higher germination percentages (98.6% and 95.8%, respectively) than the other treatments. However, seeds ingested by the maned wolf also had a high germination percentage (87.7%), above that of unmanipulated seeds (34.7%). Probably, elaiosomes of unmanipulated seeds and small remnants of this structure that resist digestion by maned wolf can decrease to some extent seed germination. We argue that dispersal of C. arenicola seeds by the ant and by the maned wolf result in different patterns of seed distribution in the environment and that they have complementary roles in structuring plant populations.

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Ocorrência de formigas cortadeiras em campos de altitude no sul do Brasil

Giesel¹,

Boff²,

Boff³

et al. 2020

RSD

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Remanescentes do ecossistema Campos Altitude são encontrados na microrregião de "Campos de Lages", SC, sul do Brasil. O objetivo deste trabalho foi avaliar e identificar espécies de formigas cortadeiras que ocorrem em Campos de Altitude. O estudo foi realizado entre os meses de Agosto de 2012 e Dezembro de 2013, em 18 municípios da micro-região de "Campos de Lages", Santa Catarina, sul do Brasil. No total, 75 formigueiros de cortadeiras foram localizados, medidos e georreferenciados, apresentando 16 formigueiros pertencentes ao gênero Atta e 59 do gênero Acromyrmex. Amostras de formigas de diferentes castas foram recolhidas de cada formigueiro para identificação adequada. Uma espécie foi identificada no gênero Atta, A. sexdens piriventris e oito no gênero Acromyrmex, A. laticeps, A. heyeri, A. Iundii, A. crassispinus, A. ambiguus, A. aspersus, A. coronatus. As espécies Atta sexdens piriventris, Ac. laticeps e Ac. heyeri foram as mais frequentes. Espécies pertencentes ao gênero Acromyrmex foram localizadas em altitudes acima dos 1000 metros, e tamanho médio de formigueiros de 1,04 ± 0,93 m2. Formigueiros do gênero Atta foram localizados em altitudes de até 850 metros, e apresentaram um tamanho médio 132,75 ± 12,96 m2 de área total de superfície, considerando à área dos olheiros.

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Dispersão de sementes de Copaifera arenicola (Caesalpinioideae-Fabaceae) por formigas cortadeiras em remanescentes de Caatinga

Cited by 3 publications

References 9 publications

Contrasting patterns of host selection and performance of insect seed predators on three sympatric host plant species

Contrasting patterns of host selection and performance of insect seed predators on three sympatric host plant species

Seed germination of a myrmecochorous plant endemic to the Brazilian semiarid region: the wolf is not so bad

Ocorrência de formigas cortadeiras em campos de altitude no sul do Brasil

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