LA REFERENCIA DE HOY NOV 5

(Es una publicación nueva para Estación Biológica La Selva)

Colwell, R.K.; Brehm, G.; Cardelús,C.L.; Gilman, A.C.; Longino, J.T. 2008. Global warming, elevational range shifts, and lowland biotic attrition in the wet tropics. Science 322 (5899) : 258-261.

Resumen: Many studies suggest that global warming is driving species ranges poleward and toward higher elevations at temperate latitudes, but evidence for range shifts is scarce for the tropics, where the shallow latitudinal temperature gradient makes upslopeshifts more likely than poleward shifts. Based on new data for plants and insects on an elevational transect in Costa Rica, we assess the potential for lowland biotic attrition, range-shift gaps, and mountaintop extinctions under projected warming. We conclude that tropical lowland biotas may face a level of net lowland biotic attrition without parallel at higher latitudes (where range shifts may be compensated for by species from lower latitudes) and that a high proportion of tropical species soon faces gaps between current and projected elevational ranges.

Palabras claves : Climatic change; Temperate latitudes; Higher latitudes; Range shifts; Temperature gradient; Species ranges; Tropical rain forests; Extinctions; Recent climate change; Species richness; Responses; Biodiversity; Gradient impacts; Growth.

Biblioteca OET: NBINA-9542


5 Noviembre 2008

referencia de hoy nov 7

(Es una publicación nueva para Estación Biológica La Selva y Estación Biológica Palo Verde)

Davis, S. R.; Gentili-Poole, P.; Mitter, C. 2008. A revision of the Cossulinae of Costa Rica and cladistic analysis of the world species (Lepidoptera: Cossidae). Zoological Journal of the Linnean Society 154 (2): 222-277.

Resumen: The Cossidae are an economically important family of moths consisting of six subfamilies and more than 700 species globally. Their larvae are often of serious concern to forestry and horticulture in that they are known to bore in the branches and trunks of a wide range of trees and shrubs. Cossulinae is one of the six subfamilies of Cossidae and is restricted to the New World. As a result of this revision, the Costa Rican Cossulinae has been found to consist of five genera and 18 species. The phylogenetic relationships of all Cossulinae genera were analysed using the computer programs WinClada and NONA. Glandular organs new to Cossidae and the Lepidoptera have also been discovered. Four genera, Biocelllata gen. nov., Magulacra gen. nov., Simplicivalva gen. nov. and Spinulata gen. nov., and the following nine species are described as new: Biocellata bifida sp. nov., Biocellata davisorum sp. nov., Cossula buspina sp. nov., Cossula duplexata sp. nov., Cossula longirostrum sp. nov., Cossula minutilobasp. nov., Simplicivalva ampliophilobia sp. nov., Spinulata oblongata sp. nov. and Spinulata quasivinnea sp. nov.

Palabras claves : New genus; New species; Distribution ; Abdominal tubercles; Carpenter moths; Glands; Phylogeny; Taxonomy; New combinations.

Biblioteca OET: NBINA-9642


7 Noviembre 2008

LA REFERENCIA DE HOY

(Es una publicación nueva para Estación Biológica La Selva)

Caspers, B.; Franke, S.; Voigt, C.C. 2008. The wing-sac odour of male greater sac-winged bats Saccopteryx bilineata . In: Chemical Signals in Vertebrates 11. Hurst, J.L.; Beynon, R.J.; Roberts,S.C.; Wyatt, T.D. (eds.). New York: Springer, 2008. Pp. 151-160.

Resumen: Male Saccopteryx bilineata possess a sac-like organ for the storage and display of odoriferous secretion in their front wing membrane. Since males use the scent in agonistic and courtship activities, and compose it from different secretions of distinct sources, like saliva, urine and gland secretion, we hypothesized that multiple information is encoded in the male scent-profile. We expected that the odour profile of males varies seasonally, giving information on male reproductive status. In additionthe odour profile ought to vary between individuals, thus providing the possibility for individual recognition. We repeatedly collected samples from wingsac liquids of 20 male S. bilineata in five Costa Rican colonies during the mating and non-mating season. Samples were analysed by gas chromatography coupled to mass spectrometry to compare wing-sac contents. Wing-sac odours included various substances such as carboxylic acids, terpenoids and aromatic compounds. Male scent profiles varied (1) between seasons in the relative amount of tetradecanoic and octadecanoic acid, and (2) between individuals in the relative amount of two species-specific substances. These results suggest that the wing-sac liquid of male S. bilineata is indeed a composite trait and may be useful for the simultaneous transfer of multiple information.

Palabras claves : Bats; Lesser Sac-winged bat ; Mate choice; Wing-sac odour; Olfactory communication ; Scent .

Biblioteca OET: NBINA-9399


13 Noviembre, 2008