Título:	Plant invasion affects vegetation structure and sediment nitrogen stocks in subtropical mangroves
Autor(es):	Sampaio, Jéssica Airisse Guimarães Reis, Carla Roberta Gonçalves Lignon, Marília Cunha Nardoto, Gabriela Bielefeld Salemi, Luiz Felippe
ORCID:	https://orcid.org/0000-0001-8062-7417 https://orcid.org/0000-0003-2271-5712
Afiliação do autor:	Universidade de Brasília, Campus de Planaltina, Núcleo de Estudos e Pesquisas Ambientais e Limnológicas – Programa de Pós-Graduação em Ciências Ambientais Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Ecologia Universidade Estadual Paulista, Campus Experimental de Registro Universidade de Brasília, Campus de Planaltina, Núcleo de Estudos e Pesquisas Ambientais e Limnológicas – Programa de Pós-Graduação em Ciências Ambientais Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-Graduação em Ecologia Universidade de Brasília, Campus de Planaltina, Núcleo de Estudos e Pesquisas Ambientais e Limnológicas – Programa de Pós-Graduação em Ciências Ambientais
Assunto:	Manguezais Plantas invasoras Poluição por nitrogênio Árvores - mortalidade
Data de publicação:	Dez-2021
Editora:	Elsevier Ltd.
Referência:	SAMPAIO, Jéssica Airisse Guimarães et al. Plant invasion affects vegetation structure and sediment nitrogen stocks in subtropical mangroves. Marine Environmental Research, [S. l.], v. 172, 105506, Dec. 2021. DOI: https://doi.org/10.1016/j.marenvres.2021.105506.
Abstract:	Plant invasion can primarily affect the structure and functioning of terrestrial and aquatic ecosystems. Although there is evidence that plant invasion can modify organic matter dynamics in mangroves, it is uncertain whether and to which extent these changes can affect carbon (C) and nitrogen (N) dynamics in the sediment-plant system. Here, we measured: (i) the structure of native vegetation and C and N in the sediment-plant system in subtropical mangroves subjected to aquatic macrophytes invasion in southeastern Brazil. We answered the following questions: i) Do invaded mangroves differ in aboveground biomass compared to non-invaded mangroves?; ii) Are there C4 macrophytes in these sites? iii) What are the C and N stocks in sediment of invaded mangroves? We quantified C and N concentrations and the isotopic signature of such elements (δ13C and δ15N) in the sediment-plant system, the C and N stocks in the sediment (0–20 cm depth), and mangrove aboveground biomass. Mangrove aboveground biomass was lower at invaded compared to non-invaded sites reflecting the species displacement in invaded sites. The sediment at invaded mangroves did not significantly contribute to C4 sources because of the large predominance of both mangrove and invasive C3 plants. While sediment C stocks were similar among study sites (∼47 Mg ha−1), N stocks were lower at invaded (2.7 Mg ha−1) comparing to non-invaded (3.2 Mg ha−1) mangroves. The lower N stocks at invaded sites can reflect the higher leaf N concentrations and lower C:N ratios of invasive plants compared to mangroves. Thus, the effects of macrophytes invasion in subtropical mangroves are more apparent for vegetation structure and N stocks. C stocks alteration is expected the be detectable in the future.
Unidade Acadêmica:	Faculdade UnB Planaltina (FUP) Instituto de Ciências Biológicas (IB) Departamento de Ecologia (IB ECL)
Programa de pós-graduação:	Programa de Pós-Graduação em Ciências Ambientais Programa de Pós-Graduação em Ecologia
DOI:	https://doi.org/10.1016/j.marenvres.2021.105506
Versão da editora:	https://www.sciencedirect.com/science/article/pii/S0141113621002622?via%3Dihub#kwrds0010
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