Modeling habitat suitability of the invasive clam Corbicula fluminea in a Neotropical shallow lagoon, southern Brazil.
This study aimed to model the habitat suitability for an invasive clam Corbicula fluminea in a coastal shallow lagoon in the southern Neotropical region (-30.22, -50.55). The lagoon (19km2, maximum deep 2.5m) was sampled with an Ekman dredge in an orthogonal matrix comprising 84 points. At each sampling point, were obtained environmental descriptors as depth, organic matter content (OMC), average granulometry (Avgran), and the percentage of sand (Pcsand). Prediction performance of Generalized Linear Models (GLM), Generalized Additive Models (GAM) and Boosted Regression Tree (BRT) were compared. Also, niche overlapping with other native clam species (Castalia martensi, Neocorbicula limosa and Anodontites trapesialis) was examined. A BRT model with 1400 trees was selected as the best model, with cross-validated correlation of 0.82. The relative contributions of predictors were Pcsand-42.6%, OMC-35.8%, Avgran-10.9% and Depth-10.8%. Were identified that C. fluminea occur mainly in sandy sediments with few organic matter, in shallow areas nor by the shore. The PCA showed a wide niche overlap with the native clam species C. martensi, N. limosa and A. trapesialis.
Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Universidade Federal de Santa Catarina, Florianópolis SC , Brazil, Programa de Pós-graduação em Ecologia, Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas - CCB, Universidade Federal de Santa Catarina - UFSC, Ed. Fritz Muller, CEP 88010-970, Florianópolis, SC, Brazil.
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Silveira
Departamento de Oceanografia, Fundação Universidade Federal do Rio Grande, Fundação Universidade Federal do Rio Grande, Rio Grande RS , Brazil, Departamento de Oceanografia, Fundação Universidade Federal do Rio Grande - FURG, Avenida Itália, Km 8, Campus Carreiros, CP 474, CEP 96201-900, Rio Grande, RS, Brazil.
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Gama
Departamento de Biodiversidade e Ecologia, Pontifícia Universidade Católica do Rio Grande do Sul, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre RS , Brazil, Laboratório de Ecologia Aquática, Departamento de Biodiversidade e Ecologia, Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS, Avenida Ipiranga, 6681, CEP 90619-900, Porto Alegre, RS, Brazil.
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Alves
Departamento de Biodiversidade e Ecologia, Pontifícia Universidade Católica do Rio Grande do Sul, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre RS , Brazil, Laboratório de Ecologia Aquática, Departamento de Biodiversidade e Ecologia, Pontifícia Universidade Católica do Rio Grande do Sul - PUCRS, Avenida Ipiranga, 6681, CEP 90619-900, Porto Alegre, RS, Brazil.
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Fontoura
D000818:Animals; D001938:Brazil; D049874:Corbicula; D017753:Ecosystem; D004784:Environmental Monitoring; D058865:Introduced Species / Q000706:statistics & numerical data*; D008962:Models, Theoretical; D011156:Population Density; D011157:Population Dynamics