Crescimento e nutrição mineral de Urochloa arrecta

Bianco, S.; Carvalho, Leonardo Bianco de; Bianco, Matheus Saraiva; Yamauchi, Alfredo Kohiti Feres

doi:10.1590/s0100-83582015000100004

Cited by 11 publications

(5 citation statements)

References 11 publications

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“…arrecta populations are highly resistant to drought and to the fluctuations in the reservoir levels, registering high recovery rate in environments where the reduction of their colonization 4 was observed (Thomaz et al, 2009a,b), high growth and allocation of resources in comparison to other grasses (Bianco et al, 2015), however, this scenario was not compatible with the low infestation rate and structure of populations in the studied basin.…”

Section: Resultsmentioning

confidence: 83%

Status of the Invasion of a Poaceae Species in Tropical Semiarid Reservoirs

2017

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-The species of the Urochloa genus, exotic and infesting in Brazilian waters, are known to be invasive and dominant, occupying from humid, shallow areas, and irrigation canals to margins of deep reservoirs. This paper hypothesis that less depth reservoirs have higher infestation rate and higher biomass of U. arrecta. The objectives were to measure the percentage of occurrence of exotic macrophyte U. arrecta in 40 ecosystems from the Mamanguape basin (Paraíba, Brazil) and determine the infestation of the species in two reservoirs. The acquired data were geo-referenced with the ArcGIS software (v. 9.3). A covariance analysis was performed using the R program (The R project is Statistical Computing). The results showed large spatial distribution of the species, indicating that reservoirs may act as steppingstones in the landscape, in a regional scale. The hypothesis of biotic acceptance is seen as a relevant factor in explaining the presence of the species with low percentage of occurrence in 37 out of the 40 sampled ecosystems, being observed only in areas prone to the colonization of native and naturalized macrophytes, in banks and points of lower declivity, in both spatial scales studied. Thus, factors such as environmental instability (promoted by intermittent or prolonged desiccation of the habitat), shadowing and declivity of the reservoirs synergistically acted on exotic and native species.Keywords: Urochloa arrecta, aquatic ecosystems, spatial scales. RESUMO -Espécies do gênero

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Section: Resultsmentioning

confidence: 83%

Status of the Invasion of a Poaceae Species in Tropical Semiarid Reservoirs

2017

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“…ex T.Durand & Schinz) Morrone & Zuloaga and Megathyrsus maximus (Jacq.) B.K.Simon & S.W.L.Jacobs) (Thomaz et al 2009 ) that were previously used for livestock and are highly competitive and very resistant to disturbances, thereby hindering the regeneration of native vegetation (Bianco et al 2015 ; Leal et al 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Assessing the role of protected areas in the land-use change dynamics of a biodiversity hotspot

Schmitz

Couto

Xavier

et al. 2023

Ambio

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Although protected areas (PAs) are designed to safeguard natural ecosystems from anthropic modifications, many PAs worldwide are subjected to numerous human-induced impacts. We evaluated whether the establishment of PAs in the Upper Paraná River floodplain region could reduce anthropic landscape changes and whether there is a difference in protection when using different PA restriction categories. We analyzed the overall landscape dynamics using 30 years of land-use time series data and evaluated the change intensity via a partial land-use intensity analysis. Despite the increasing landscape anthropization, the PAs seemed to relieve the general change process, protecting natural areas mainly from agricultural expansion. Concerning the degree of use restriction, more restricted protection led to less human-induced changes. Finally, accessing PA effectiveness is a multidisciplinary challenge for researchers; however, this knowledge is crucial to avoid misunderstandings or poorly crafted public policies or decisions that may harm the environment.

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“…The presence of U. subquadripara is highly dependent on water availability and quality [99]. However, when compared to other macrophytes, such as Hymenachne pernambucensis, U. subquadripara is more resistant to periods of drought [100], which may be related to greater accumulation of biomass, efficiency in the use of N and P [101], and root and stem regrowth [11]. In addition, U. subquadripara is also terrestrial, being used as pasture [56].…”

Section: Invasive Exotic Species (Urochloa Subquadripara)mentioning

confidence: 99%

Ecological Niche Modeling of Invasive Macrophyte (Urochloa subquadripara) and Co-occurrence with Natives

Duque¹,

SOUZA²,

Mendes³

et al. 2023

Preprint

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Invasive macrophytes are considered problematic in natural environments and hydroelectric reservoirs. Climate changes, the occurrence of watercourses, and biotic interactions influence the biological invasion of macrophytes. Native species can correlate with invasives positively or negatively. Urochloa subquadripara is an invasive in natural or disturbed habitats co-occurring with the natives Eichhornia crassipes and Salvinia minima. Aquatic plant communities can be altered by climate change, so species distribution models (SDMs) are important tools for predicting in-vaded areas. This work aimed to make an SDM for U. subquadripara correlating with the poten-tial distribution of native species E. crassipes and S. minima. Occurrence data for U. subquadripara, E. crassipes, and S. minima were collected from databases and in consultation with the published literature. Parameters encompassing biological information of the species were entered into the CLIMEX software and used to generate the Ecoclimatic Index (EI). The species co-occurrence was performed based on multicriteria decision-making (MCDM), and weights were assigned using the analytical hierarchy process (AHP). It was observed that U. subquadripara, E. crassipes, and S. minima have a higher occurrence in tropical and subtropical regions; however, it is predicted that, from climatic changes, these species may move to high latitudes. According to climate change, the risk of invasion by U. subquadripara in the northern hemisphere is mainly in lakes, while in the southern hemisphere, the areas conducive to invasions are rivers and reservoirs. In general, emerging and floating macrophyte species such as U. subquadripara, E. crassipes, and S. minima will be favored, causing suppression of submerged species. Therefore, identifying the potential distribution of these species allows the creation of pre-invasion intervention strategies.

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Crescimento e nutrição mineral de Urochloa arrecta

Cited by 11 publications

References 11 publications

Status of the Invasion of a Poaceae Species in Tropical Semiarid Reservoirs

Status of the Invasion of a Poaceae Species in Tropical Semiarid Reservoirs

Assessing the role of protected areas in the land-use change dynamics of a biodiversity hotspot

Ecological Niche Modeling of Invasive Macrophyte (Urochloa subquadripara) and Co-occurrence with Natives

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