Levantamento de Bromeliaceae na região do curso médio do rio Toropi, Rio Grande do Sul, Brasil

Büneker, Henrique Mallmann; Witeck-Neto, Leopoldo

doi:10.5902/2358198022371

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…tucumanensis was restricted to the western and west‐central regions. In addition to these two species, Büneker and Witeck‐Neto (2016) also recorded V. platynema in the deciduous seasonal forest approximately 400 km from the Atlantic coast. We also registered the unexpected occurrence of Billbergia zebrina and Vriesea gigantea in Santa Maria municipality on Elephant Hills (29°40′15″S 53°43′12″W) and Lizard's Stone (29°37′38″S 53°52′25″W), respectively.…”

Section: Discussionmentioning

confidence: 96%

Patterns and metacommunity processes of epiphytic bromeliad assemblages along a coastal‐inland gradient in a subtropical Brazilian geographic corridor

2022

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Metacommunity ecology investigates how drivers of regional and local scales cause compositional variation in a network of communities potentially linked by dispersal. We examined the metacommunity structure of epiphytic bromeliad assemblages along a coastal-inland gradient in a subtropical geographic corridor extending from the Atlantic coast to near the Uruguay River, in the central depression of Rio Grande do Sul State, in southernmost Brazil. We surveyed floristic and environmental data on a sequence of 71 testimonial hills. We used elements of metacommunity structure to identify metacommunity patterns (i.e. random, checkerboard, nested, Clementsian, Gleasonian, evenly spaced and quasi-structured). We ran a canonical correspondence analysis to evaluate how coastal-inland gradient influenced species distribution. Finally, we employed variation partitioning to determine archetype-based metacommunity structuring processes (i.e. species sorting, neutral dynamics, patch dynamics and mass effects). We found that temperature-and moisture-based gradients generated environmental heterogeneity that established species filtering, determining the formation of cohesive groups of epiphytic bromeliads with coincidentally occurring boundaries (i.e. quasi-Clementsian structure). As a result, we identified four metacommunity structures embedded along the coastal-inland gradient: In the eastern and east-central metacommunities, species distributions were idiosyncratic due to individual species' responses to environmental gradients (i.e. quasi-Gleasonian structure), and in the western and west-central metacommunities, we observed Clementsian and Gleasonian structures, respectively. Habitat heterogeneity and dispersal sufficiency (i.e. species sorting archetype) were the foremost drivers establishing metacommunity structures. Ultimately, and surprisingly, in the east-central metacommunity, we detected source-sink dynamics among the testimonial hills (i.e. mass effects archetype). Our findings suggest that epiphytic bromeliad assemblages are linked to a gradient-driven pattern with moderate heterogeneity (i.e. low turnover) and identify four embedded metacommunity structures. Moreover, they indicate that the species sorting archetype best represents the processes of establishing metacommunity structures.

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Section: Discussionmentioning

confidence: 96%

Patterns and metacommunity processes of epiphytic bromeliad assemblages along a coastal‐inland gradient in a subtropical Brazilian geographic corridor

2022

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Survival, and anatomical and ecophysiological changes in isolated individuals of Tillandsia recurvata L. (Bromeliaceae) grown under different shading conditions

Silva

Chaves

Silvério

et al. 2023

Botany

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Tillandsia recurvata may show morphophysiological plasticity in response to radiation availability since this species is found in different environments. This work aimed to evaluate the anatomical and physiological modifications of T. recurvata isolated individuals under different shading levels and the consequences of these changes on the growth of this species. The individuals were exposed for 60 days to treatments as follows: full sun (unshaded) and shading of 35, 75, and 85%. Growth analyses were performed, and the leaf anatomy and water content were assessed. All plants submitted to full sun or 35% shading died, whereas those under 75 and 85% shading survived. The water content in leaves and rhizomes were higher under 85% shading, and this treatment increased the leaf area and the number of leaves in T. recurvata. Leaf dry mass, leaf elongation rate, biomass allocation to rhizomes, and net assimilation rate were higher under 85% shading. The leaves had a thicker hypodermis, lower proportions of both epidermis and vascular bundles, and a higher proportion of chlorophyll parenchyma under 85% shading. Tillandsia recurvata individuals behave as sciophytic while the formation of clusters may change microclimate conditions and the behavior of clumped plants must be further investigated.

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Occurrence of parietal and invasive tapetum in Dyckia strehliana (Bromeliaceae): first report for the Family

Silva,

Oliveira

2024

Rodriguésia

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Tapetal tissue plays essential roles in the formation of generative cells, as it is related to their nutrition and development in anthers. Among the few species of Bromeliaceae for which tapetal tissue has been describe, most have a secretory tapetum and one has an invasive tapetum. This study analyzed the developmental stages of the anthers of Dyckia strehliana, with emphasis on the tapetum, to identify variability in development and structure. Botanical material was collected on the banks of the Toropi River in the state of Rio Grande do Sul, Brazil, and processed using standard plant micro-techniques. During meiosis prophase, tapetal cells of some samples remained parietal while in the others, a proportional number, the invasion of the locular space begins, culminating in total invasion during the free microspore phase and without fusion of the protoplasts. Tapetal degeneration is complete before gametogenesis begins in both types. Thus, it is possible to describe two modes of development and tapetal structure, one parietal and one invasive, although the tapetum remains as a general secretory type in both cases. Thus, according to present work, the terms invasive and parietal are indicators of states of the secretory tapetum.

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Levantamento de Bromeliaceae na região do curso médio do rio Toropi, Rio Grande do Sul, Brasil

Cited by 3 publications

References 8 publications

Patterns and metacommunity processes of epiphytic bromeliad assemblages along a coastal‐inland gradient in a subtropical Brazilian geographic corridor

Patterns and metacommunity processes of epiphytic bromeliad assemblages along a coastal‐inland gradient in a subtropical Brazilian geographic corridor

Survival, and anatomical and ecophysiological changes in isolated individuals of Tillandsia recurvata L. (Bromeliaceae) grown under different shading conditions

Occurrence of parietal and invasive tapetum in Dyckia strehliana (Bromeliaceae): first report for the Family

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