Temporal trends and effects of diversity on occurrence of exotic macrophytes in a large reservoir

Thomaz, Sidinei Magela; Carvalho, Priscilla; Mormul, Roger Paulo; Ferreira, Fernando Alves; Silveira, Márcio José; Michelan, Thaísa Sala

doi:10.1016/j.actao.2009.05.008

Cited by 59 publications

(82 citation statements)

References 44 publications

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“…Fragments can travel considerable distances via water flow, water birds and boats, and they can initiate colonization in distant habitats (Santamaria 2002;Thomaz et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Regeneration and Colonization of an Invasive Macrophyte Grass in Response to Desiccation

Michelan¹,

Thomaz²,

Carvalho³

et al. 2010

Nat. Conserv.

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The emergent macrophyte Urochloa subquadripara, an exotic and invasive species, causes extensive damage to aquatic plant assemblages. Regeneration and colonization by fragments of U. subquadripara may be affected by desiccation and may differ according to the fragment portion (apical, intermediate or basal). We tested the hypotheses that the ability of U. subquadripara fragments to regenerate and colonize declines with increasing time of exposure to desiccation, and that apical portions regenerate and colonize more quickly than intermediate and basal ones. Apical, intermediate and basal portions were exposed to different desiccation periods and left to grow in a greenhouse. Sprout and root growth were negatively and significantly affected by the desiccation period; fragments exposed to intermediate levels of desiccation regenerated and colonized the sediment at rates similar to those of the control. In addition, apical fragments showed greater development and sediment colonization than intermediate and basal fragments. Thus, the data supported our two hypotheses. Our results show that U. subquadripara has a high regeneration potential, indicating that the use of water drawdown to control its spread may be ineffective, and new strategies are required.

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“…Fragments can travel considerable distances via water flow, water birds and boats, and they can initiate colonization in distant habitats (Santamaria 2002;Thomaz et al 2009). …”

Section: Introductionmentioning

confidence: 99%

Regeneration and Colonization of an Invasive Macrophyte Grass in Response to Desiccation

Michelan¹,

Thomaz²,

Carvalho³

et al. 2010

Nat. Conserv.

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“…Esta espécie também se tornou uma das principais plantas daninhas submersas, particularmente no sudeste dos EUA (BLACKBURN et al, 1969), e recentemente também observada em águas brasileiras (primeiros registros em 2005: THOMAZ et al, 2009a). Atualmente está disseminada em reservatórios e áreas naturais da bacia do Rio Paraná (THOMAZ et al, 2009b) e estudos nessa região têm demonstrado que a "hidrila" altera os fatores limnológicos, como oxigenação da água (POSEY et al, 1993) que, por sua vez, afetam a comunidade biológica residente, levando em casos extremos à morte de peixes e outros organismos aquáticos pela redução dos níveis de oxigênio na água ( WITTENBERG; COCK, 2001).…”

Section: Aquariofilia E Ornamentação De Paisagensunclassified

Introdução de Espécies em Ecossistemas Aquáticos: Causas, Prevenção e Medidas de Controle

et al. 2016

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RESUMO:Espécies não nativas causam danos imprevisíveis sobre os ecossistemas e são consideradas pela IUCN como a segunda maior causa mundial de perda de biodiversidade. Os ecossistemas aquáticos são particularmente vulneráveis a esse impacto e muitas pesquisas mostram que essas espécies não nativas podem alterar a composição das comunidades nativas. A proposta deste estudo é apresentar as principais causas de introduções de espécies em ecossistemas aquáticos e possíveis medidas de prevenção e controle de espécies invasoras. Em ambientes aquáticos destacam-se como causas de introduções: destruição de barreiras geográficas como construções de reservatórios e canais de transposição de rios; criação e melhoria dos estoques naturais, devido à falta de planejamento na construção e manutenção dos locais de criação; aquariofilia e ornamentação de paisagens. Além disso, o turismo através da pesca esportiva, o controle biológico na tentativa de exterminar outra espécie já introduzida, a fauna associada a qual é transportada junto com a água, substratos ou hospedeiros e água de lastro principalmente proveniente de navios mercantis, também contribuem para as introduções de espécies. Medidas de controle de espécies não nativas são escassas e a identificação de vetores, monitoramento, políticas públicas e estudos são algumas estratégias que podem ajudar a diminuir os impactos ambientais causados por espécies não nativas em ecossistemas aquáticos. A divulgação e orientação sobre os impactos ambientais causados por espécies não nativas direcionadas para a população leiga e científica faz-se necessário, sendo a Internet uma ferramenta imprescindível e prioritária no combate a espécies não nativas.

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“…Changes in the communities of native species is commonly associated to the formation of exotic macrophytes populations with high density, distributed in monospecific banks in rivers, margins of supply reservoirs, flooded rice areas and irrigation canals (Mormul et al, 2010;Carniatto et al, 2013). Thus, the reduction of the richness of native species may occur due to the biotic interactions with exotic macrophytes, such as interspecific competition and, consequently, competitive exclusion (Thomaz et al, 2009b). The availability of resources and the degree of natural and/or anthropogenic perturbation are potential influencing factors in the invasion processes (Souza et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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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Temporal trends and effects of diversity on occurrence of exotic macrophytes in a large reservoir

Cited by 59 publications

References 44 publications

Regeneration and Colonization of an Invasive Macrophyte Grass in Response to Desiccation

Regeneration and Colonization of an Invasive Macrophyte Grass in Response to Desiccation

Introdução de Espécies em Ecossistemas Aquáticos: Causas, Prevenção e Medidas de Controle

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

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