Abstract
Abstract We updated the first checklist of aquatic macrophytes from Northeast Brazil (First Flora), which included data collected up to 2010, with a new checklist based on data from works published between 2011 and 2017 (New Flora). Together, these checklists record 637 species of 89 families, with an emphasis on strictly amphibious or emergent species, with 392 and 115 species, respectively. We found differences in observed richness between New Flora and First Flora, with an increase of 106 species in the New Flora. The rarefaction curve shows that a considerable increase in collection effort is necessary to determine the aquatic flora of the studied region. From the compiled data, we suggest new perspectives for floristic inventories of aquatic macrophytes, highlighting the prioritization of poorly studied areas; the exploration of ecological information of the species (e.g., endemism, rarity, threat of extinction or invasive potential); and the promotion of projects on a regional scale.
Highlights
The Northeast Region of Brazil encompasses substantial watersheds (e.g., Apodi, Parnaiba, Recôncavo Bahiano, São Francisco), until recently there has been a lack of knowledge regarding the aquatic vegetation of the area (Moura-Júnior et al 2013)
The objectives of the present study were to: i - evaluate the progress of acquiring knowledge regarding the aquatic macrophytes for the states of Northeast Brazil based on scientific studies published since 2010; ii - compile data from these two historical collection periods to update the checklist of aquatic macrophytes in the region, including complementing species data with information from Flora do Brazil 2020; and iii - use the collected data to suggest new perspectives for floristic inventories of aquatic macrophytes in the region
Cumulative Flora The CF included 637 species distributed among 320 genera and 89 families
Summary
The Northeast Region of Brazil encompasses substantial watersheds (e.g., Apodi, Parnaiba, Recôncavo Bahiano, São Francisco), until recently there has been a lack of knowledge regarding the aquatic vegetation of the area (Moura-Júnior et al 2013) Some researchers relate this poor knowledge to the lack of macrophytes specialists in the region (Thomaz & Bini 2003; Machado-Filho et al 2014). This checklist was developed with metadata obtained from scientific works and the SpeciesLink network (Moura-Júnior et al 2013), and noted 13 publications during the 2000s with a floristic focus of aquatic macrophytes. In total it recorded 412 species distributed among 27 genera and 72 families
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