Aspectos biológicos y nutricionales de Dasypus novemcinctus (Linnaeus, 1758)

Testa, Carolyne Assis Eigenheer Pinke; Hippólito, Alícia Giolo; Santos, Gisele Junqueira dos; Ferro, Bárbara Sardela; Novais, Thiago Ferla

doi:10.31533/pubvet.v13n5a329.1-11

Cited by 2 publications

(2 citation statements)

References 20 publications

(34 reference statements)

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“…Leafcutter colony density drastically increases on both small forest islands in archipelagos elsewhere (Rao 2000, Terborgh et al 2001) and near edges in forest fragments surrounded by a terrestrial matrix (Wirth et al 2007, Dohm et al 2011, Silva et al 2012). Contrary to our expectations, leafcutter occurrence throughout the Balbina archipelago was limited by forest island area, but additionally boosted by high availability of pioneer trees, their preferred host plants (Farji‐Brener 2001, Wirth et al 2003, Falcão et al 2011), rather than being suppressed by high armadillo abundance, their direct nest predators (Testa et al 2019).…”

Section: Discussioncontrasting

confidence: 93%

Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

et al. 2021

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Under habitat loss and fragmentation, the intensity of local ecological processes involving species interactions changes pervasively, accelerating local species extinctions, and disrupting essential ecosystem functions. We addressed this issue by examining the direct population drivers of apex predators (five felid species), armadillo mesopredators, leafcutter ants (Atta sexdens and Atta cephalotes), and the indirect effects mediated by their inter-trophic relationships in a~25-yr-old land-bridge island system formed by a hydroelectric dam in the Central Amazon. These trophic groups and pioneer tree abundance were surveyed across 34 variable-sized islands and three continuous forest sites. Leafcutter populations were characterized in relation to their occurrence, colony density, and proportion of inactive colonies, and for each leafcutter response, we considered the direct and/or indirect effects of forest area on each trophic group. Leafcutter occupancy was best explained by the direct model, colony density by either the direct or the indirect model, and proportion of inactive colonies by an indirect model via the effects of pioneer tree abundance. The direct forest area effects were positive for apex predators and leafcutter occupancy, but negative for armadillos and pioneer trees. Yet leafcutter colony density declined in increasingly larger forest areas. The absence or low abundance of apex predators on small islands released armadillo hyper-abundance, which contrary to expectation from top-down control, covaried positively with leafcutter colony density. Finally, the indirect model showed that leafcutter colonies were more active under higher pioneer tree abundances. That leafcutter density increases on smaller islands whenever present is likely attributed to the hyper-abundance of pioneer plants and canopy gaps. Although apex predators apparently suppressed armadillos, the remaining fraction of the food web seems to be controlled by bottom-up mechanisms most likely related the overall low foliage palatability typical of wet evergreen forests. Our findings can be used to inform the long-term viability of forest ecosystems affected by hydropower development in lowland Amazonia.

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Section: Discussioncontrasting

confidence: 93%

Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

et al. 2021

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“…Like others, Dasypodidae, Dasypus novemcinctus, has short, powerful claws and limbs, suitable for excavating different types of soil. This species has a maximum length of 60 cm, considered an osteodermal mammal of medium size and low metabolic rate (Dhindsa et al., 1971; Glass, 1985; Testa et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Morphological features of lower respiratory tract of nine‐banded armadillo (Dasypus novemcinctus, Linnaeus, 1758)

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et al. 2020

Anat Histol Embryol

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The nine‐banded armadillo (Dasypus novemcinctus) is a mammal of the Xenarthra Superorder, which inhabits Central, South and North America. Few morphological descriptions are observed in this species, including the respiratory tract; therefore, the objective of this study was to describe morphologically the lower respiratory tract of the nine‐banded armadillo. Five animals were dissected, and the macroscopic and microscopic aspects were analysed. In the anatomical analysis, the perfusion technique was performed with vinyl acetate and the fragments of tissue from respiratory organs (trachea, bronchi, bronchioles and pulmonary lobes) were stained with haematoxylin–eosin for visualization under optical microscopy. Containing about 30 cartilage rings, the trachea is lined internally with ciliated pseudostratified epithelial tissue. The lungs are subdivided into lobes by deep interlobar fissures, with two lobes in the right lung and three lobes in the left lung. Microscopically, the primary, secondary and tertiary bronchi have non‐ciliated pseudostratified epithelium with goblet cells. It was found that macro‐ and microscopically the respiratory tract of this species is similar to existing xenarthras and other excavator animals. These data provide subsidies for the clinic and preservation of this species.

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Aspectos biológicos y nutricionales de Dasypus novemcinctus (Linnaeus, 1758)

Cited by 2 publications

References 20 publications

Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

Drivers of leafcutter ant populations and their inter‐trophic relationships in Amazonian forest islands

Morphological features of lower respiratory tract of nine‐banded armadillo (Dasypus novemcinctus, Linnaeus, 1758)

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