Araceae of Grumari restinga: contribution to the conservation of the flora of Rio de Janeiro State, Brazil

Luana S.B Calazans,Cassia Mônica Sakuragui,Rosana Conrado Lopes,Rodrigo Theófilo Valadares

doi:10.1590/0102-33062017abb0224

Luana S.B Calazans, Cassia Mônica Sakuragui + Show 2 more

Open Access

https://doi.org/10.1590/0102-33062017abb0224

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Abstract

ABSTRACT This study surveyed species of the family Araceae in Grumari restinga, located in the metropolitan region of the city of Rio de Janeiro, Brazil. We aimed to: i) evaluate the contribution of a single locality (Grumari restinga) to regional conservation (Rio de Janeiro State) of Araceae; and ii) compare the distribution of species of Araceae among restingas of the state. We calculated the extent of occurrence and the area of occupancy in the entire state for eight species of Araceae found in Grumari,and performed a similarity analysis among restingas. Our data demonstrate that the extent of occurrences for Anthurium augustinum, A. coriaceum and A. maricense are influenced by Grumari because this area is the boundary of their known distribution in the state. Grumari did not have an influence on the distribution of the other studied species. We found Anthurium coriaceum, A. luschnathianum and Philodendron crassinervium to exhibit unusual habits as terrestrial plants in sandy soil. The similarity analysis identified six groups of Araceae, four of which are related to the distance from adjacent forests. We demonstrated that this small conservation unit represents a key locality in the preservation of natural populations of species of Araceae in Rio de Janeiro State.

Highlights

Restinga is a phytogeographic unit of the AtlanticForest, encompassing a coastal ecosystem with vegetation on Quaternary sediments that comprises different herbaceous, shrubby and tree communities (Pereira &Araujo 2000; Pereira 2003)
Araceae of Grumari restinga: contribution to the conservation of the flora of Rio de Janeiro State, Brazil de Janeiro and found that the extent of occurrence of only three out of eight species is influenced by Grumari restinga
Eight species of two genera of Araceae were recorded in Grumari restinga (Tab. 2), and all of the species are endemic to the Atlantic Forest (Coelho et al 2009)

Summary

Introduction

Restinga is a phytogeographic unit of the AtlanticForest, encompassing a coastal ecosystem with vegetation on Quaternary sediments that comprises different herbaceous, shrubby and tree communities (Pereira &Araujo 2000; Pereira 2003). Distribution patterns found in the literature suggest that the species composition of restinga includes taxa from neighboring communities (e.g. dense ombrophilous forest) and species widely distributed in South America (Araujo 2000). The increasing loss of neighboring vegetation, such as montane forest, has resulted in areas of restinga being the last refuges of populations with a previously wider distribution. Many floristic lists have already been produced for restinga areas in the state of Rio de Janeiro (e.g. Pereira & Araujo 2000), but surveys focused on particular plant families are still scarce Fragments of restinga along the Rio de Janeiro coast (from municipality of São João da Barra to the municipality of Paraty) are key areas for the conservation of rare plants (Giulietti et al 2009) and represent regions of extremely high priority for the conservation of threatened species (Loyola et al 2014)

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