Comunidades de machos de abelhas Euglossina (Hymenoptera: Apidae) em fragmentos florestais no Sul do Brasil

Abstract

-The aim of this work was to study communities of euglossine bees in three fragments of semideciduous forest with different sizes (8.5 ha, 86 ha and 2280 ha), in Northern Paraná State (Brazil). From November 2001 through April 2002 males of euglossine bees were sampled using chemical baits. A total of 245 males from four genera and seven species visited the baits. In the largest fragment were sampled 152 males of 6 species, in the medium, 45 males of five species and, in the smallest, 48 males of seven species. The diversity (H') and species evenness (J') varied from 1.21 to 1.42 and from 0.62 to 0.86, respectively. A change in abundance order of species was verified in the different areas. Apparently, a reduction on fragment size affected negatively the frequency of Eufriesea violacea Blanchard, the most common species (43.4%) in the largest fragment and the fourth (8.3%) in the smallest one. The results suggest the need of maintenance of large forest areas to keep viable populations of this and probably other species of euglossine bees.

The orchid bee fauna (Hymenoptera, Apidae) of a core area of the Cerrado, Brazil: the role of riparian forests as corridors for forest-associated bees

“…The species richness in Brejão was similar to those found in other inventories carried out in the Cerrado domain (Aguilar 1990, Rebêlo & Cabral 1997, Alvarenga et al 2007, Nemésio & Faria 2004) and in fragments of the semideciduous "low mountain rain forest" (Rizzini 1979), at elevations of 300-900 m, in the Atlantic Forest domain in the states of Minas Gerais (Nemésio 2003, Nemésio & Silveira 2007a, 2010, São Paulo (Rebêlo & Garófalo 1997) and Paraná (Sofia & Suzuki 2004). These forests are characterized by relatively open canopy, 15-25 m tall, and occur under climates with two well defined seasons, rainy and dry.…”

Abelhas Euglossina (Hymenoptera, Apidae) coletadas em uma monocultura de eucalipto circundada por Cerrado em Urbano Santos, Maranhão, Brasil

“…Talvez fatores como o tamanho das três áreas, a influência da vegetação do entorno (CARVALHO et al, 2006) e o isolamento da mata mesofítica quando comparada às outras áreas, possa ser considerado, entretanto são necessários estudos e testes mais quantitativos. Em diversos trabalhos realizados (BRAGA, 1976;RAW, 1989;MORATO et al, 1992;NEVES & VIANA, 1997;REBÊLO & CABRAL, 1997;REBÊLO & GARÓFALO, 1997;ALBUQUERQUE et al, 2001;SOFIA & SUZUKI, 2004;CARVALHO et al, 2006) Euglossa cordata (Linnaeus, (MORATO et al, 1992;MORATO, 1994) e na Bahia (NEVES & VIANA, 1997) onde salicilato foi bastante atrativo e em Viçosa, Minas Gerais (PERUQUETTI et al, 1999), em que vanilina foi o composto que atraiu o maior número de espécimes.…”

Orchid bees: a new assessment on the rarity of diploid males in populations of this group of Neotropical pollinators

“…Some euglossine species are apparently sensitive to environmental disturbances (Powell and Powell 1987;Tonhasca et al 2002;Giangarelli et al 2009;Nemésio 2013), such as forest fragmentation and reduction in fragment size (Powell and Powell 1987;Sofia and Suzuki 2004;Giangarelli et al 2009). Apart from reductions in the abundance of orchid bees in forest fragments of reduced size, studies have shown that some species may have stronger dispersal limitations in fragmented landscapes, and the type of matrix may also affect the dispersal of some species of the group differently (Powell and Powell 1987;Milet-Pinheiro and Schlindwein 2005).…”