Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X8219
Acta Limnologica Brasiliensia
Thematic Section: Limnology of Subtropical Aquatic Environments

Plant species invasion effects on litter dynamics in subtropical streams

Efeitos da invasão de espécies vegetais na dinâmica da serapilheira em riachos subtropicais

Lucas Eugenio Fontana; Rozane Maria Restello; Tanise Luisa Sausen; Luiz Ubiratan Hepp

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Abstract

Abstract:

Aim: We evaluated the effect of the presence of Hovenia dulcis Thunb. (Rhamnaceae) in riparian zones on the organic matter dynamics of small subtropical streams.

Methods: We conducted this study in three subtropical Atlantic Forest streams with different densities of H. dulcis in riparian vegetation located in southern Brazil. In each stream, we quantified the input of allochthonous organic matter for one year using buckets (area: ​​0.04 m2/bucket) suspended about 1 m from the streambed in three different sections (15 buckets/stretch = 45 buckets/stream). Monthly, the plant material retained in the buckets was collected individually, dried (40±5 °C/72 h), identified (native litter together and H. dulcis litter alone) and weighed.

Results: The largest input of native organic matter occurred during the winter months (~55 g.m-2), ranging from ~31 g.m-2 (summer) to ~46 g.m-2 (spring) over the year. The input of H. dulcis organic matter was concentrated in the autumn (~56 g.m-2) and summer (~28 g.m-2), being scarce in the other seasons (~3 g.m-2 in the spring and winter). Only the contribution of native organic matter was associated with precipitation. Contrary to that observed with native vegetation (input of organic matter related with rainfall), H. dulcis input was related to the phenology of the species, which is deciduous, with leaf fall strongly marked, occurring especially during the autumn.

Conclusions: When present at high densities (dominant), the presence of H. dulcis in riparian stream vegetation makes the supply of allochthonous plant resources scarce at some periods of the year, altering the energy availability in these ecosystems and, potentially, the functioning of subtropical streams.
 

Keywords

Atlantic Forest, biological invasion, exotic species, riparian zones

Resumo

Resumo:

Objetivo: Avaliamos o efeito da presença de Hovenia dulcis Thunb. (Rhamnaceae) em zonas ripárias sobre a dinâmica da matéria orgânica de pequenos riachos subtropicais.

Métodos: Realizamos este estudo em três riachos subtropicais de Mata Atlântica com diferentes densidades de H. dulcis na vegetação ripária localizados no sul do Brasil. Em cada riacho quantificamos o aporte de matéria orgânica alóctone durante um ano utilizando baldes (área: 0.04 m2/balde) suspensos a cerca de 1 m do leito dos riachos em três trechos distintos (15 baldes/trecho = 45 baldes/riacho). Mensalmente, o material vegetal retido nos baldes foi recolhido individualmente, seco (40±5 ºC/72 h), identificado (detritos nativos conjuntamente e detritos de H. dulcis isoladamente) e pesado.

Resultados: Em média, o maior aporte de matéria orgânica nativa ocorreu durante os meses de inverno (~55 g.m-2), tendo oscilado entre ~31 g.m-2 (verão) e ~46 g.m-2 (primavera) ao longo do ano. O aporte de matéria orgânica de H. dulcis, entretanto, foi concentrada nos meses de outono (~56 g.m-2) e verão (~28 g.m-2), sendo escassa nas outras estações do ano (~3 g.m-2 na primavera e no inverno). Apenas a contribuição da matéria orgânica nativa foi associada à precipitação mensal. A presença de H. dulcis alterou a dinâmica da matéria orgânica alóctone nos riachos. Ao contrário do observado com a vegetação nativa (aporte de matéria orgânica relacionada com a pluviosidade) o aporte de H. dulcis esteve relacionado com a fenologia da espécie, que é decídua e com queda foliar fortemente marcada, ocorrendo especialmente durante os meses de outono.

Conclusões: Quando presente em elevadas densidades (dominante), a presença de H. dulcis na vegetação ripária de riachos torna a oferta de recursos vegetais alóctones escassa em alguns períodos do ano alterando a disponibilidade de energia nesses ecossistemas e, potencialmente, o funcionamento de riachos subtropicais.
 

Palavras-chave

Mata Atlântica, invasão biológica, espécies exóticas, zonas ripárias

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Submitted date:
09/29/2019

Accepted date:
08/17/2020

Publication date:
10/08/2020

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