Diversidad de helechos y licófitas de la Reserva Natural Punta Lara, Buenos Aires, Argentina

Abstract

Diversity of ferns and lycophytes from Reserva Natural Punta Lara, Buenos Aires, Argentina. Punta Lara Natural Reserve shelters the relict of the Southernmost riparian forest in the world, where the flora is threatened by the anthropic expansion and by the introduction of exotic species. In this area the ferns and lycophytes grow in particular environments as marshland, grassland and marginal forest. The aim of this work was to evaluate the diversity of ferns and lycophytes that inhabit in Punta Lara Natural Reserve. Field trips were conducted from 2006 to 2009 and local herbaria and specific bibliography were also revised. As a result of our study twenty four taxa of ferns and lycophytes were recognized. Their habit was mainly terrestrial (70%), fewer aquatic (17%) and epiphytic (13%). Five native taxa were scarcely recorded whereas two native species previously documented were not found. We assume that the main threats on ferns and lycophytes populations in Punta Lara Reserve are: removal for comercialization, invasion by exotic species and climatic fluctuations (drought periods). Keys for taxa identification are given and strategies for the conservation of threatened taxa are proposed. Rev. Biol. Trop. 59 (3): 1037-1046. Epub 2011 September 01.

Morfogénesis de la fase sexual de los helechos epífitos Microgramma mortoniana y Pleopeltis macrocarpa (Polypodiaceae) reserva Natural Punta Lara, Buenos Aires, Argentina

“…El bosque marginal, desarrollado sobre albardones bordeados por pequeños arroyos que entran desde el Río de La Plata, está representado por un nivel superior arbóreo y por debajo los estratos arbustivos y herbáceos, de los cuales los helechos y licofitas forman parte fundamental. En la reserva se registran 24 especies de helechos que se desarrollan sobre el sustrato o sobre troncos de árboles caídos (Giudice, Ramos Giacosa, Luna, Yáñez, & de la Sota, 2011a).…”

Helechos y licofitos de la Reserva Natural Educativa Colonia Benítez (Chaco, Argentina)

“…tristicula en Colonia Benítez, dentro de lo que Cabrera (1971) consideró Dominio Chaqueño. Otras especies como Doryopteris concolor, D. pentagona y Pleopeltis minima al parecer también usan este corredor biogeográfico para llegar hasta los bosques de Punta Lara, sobre el margen del Río de La Plata, como lo registraron Giudice et al (2011).…”

El cultivo in vitro de esporas y los aspectos reproductivos del helecho anual Anogramma chaerophylla (Pteridaceae).

“…The Natural Reserve Punta Lara is located on the Coast of La Plata River and constitutes the core area of the Biosphere Reserve Parque Pereyra Iraola. In this zone A. chaerophylla grows associated with gallery forests that border internal streams, where vegetation and in particular ferns are stressed by urbanization, furtive pulling out and invasion of exotic species (Giudice et al, 2011).…”