Browsing by Issue Date, starting with "2001-07"
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- Flora marina de las islas Salvajes : resultados preliminares de la campaña "Macaronesia 2000".Publication . Parente, Manuela I.; Gil-Rodríguez, María C.; Haroun, Ricardo J.; Neto, Ana I.; De Smedt, G.; Hernández-González, C. L.; Berecibar Zugasti, EstibalizSe relacionan las macroalgas (173 táxones) identificadas hasta el momento, como resultado de las recolecciones realizadas durante la expeditión científica MACARONESIA 2000 en el intermareal y submareal de las Ilhas Selvagens (mayo de 1999). Se citan por vez primera para estas costas 66 táxones, de ellos 53 corresponden a especies y 13 géneros. Desde el punto de vista ficogeográfico se amplía el rango de distribución de numeorsas especies. Las nuevas citas contribuyen principalmente a incrementar el número de táxones con patrones de distribución macaronésica y anfiatlántica. En este sentido, se confirma lo expuesto por Prud'homme van Reine & van den Hoek (1990) para sustentar y considerar la flora marina bentónica de los archipiélagos de Salvages, Madeira y Canarias, con características similares, desinándolos por ello como un grupo de archipiélagos que conforman la Macaronesia s.s.
- Comparison of three sources of inocula for predicting apparent digestibility of ruminant feedstuffsPublication . Borba, Alfredo Emílio Silveira de; Correia, Pedro J. A.; Fernandes, Jorge M. M.; Borba, Anabela F. R. S.In the present study, gas production of three sources of inocula rumen liquor from fistulated sheep, rumen liquor from slaughtered cattle, and a suspension of sheep faeces, were evaluated to predict the apparent digestibility of ruminant feedstuffs. The highest gas production was obtained with rumen liquor from slaughtered cattle, and the lowest (P < 0.05) with the suspension of sheep faeces. The relationship between gas production and in vivo apparent digestibility was determined on 24 samples of graminaceous (oats (Avena sativa L.), Italian ryegrass (Lolium multiflorum L.), perennial ryegrass (Lolium perenne L.) and maize (Zea mays L.)) at three stages of growth, and on fresh and ensiled forages. The best results for predicting in vivo digestibility were obtained with green forages and sheep rumen liquor. Correlations were not significant for silages (P > 0.05).
- Macroalgal species diversity and biomass of subtidal communities of São Miguel (Azores).Publication . Neto, Ana I.The benthic algal communities of two subtidal sites, located on opposite coasts of São Miguel island (São Roque in the south and São Vicente on the north coast), were studied over a 2 year period (September 1993-September 1995). At both sites the sublittoral region was surveyed from low-tide level down to a depth of 15 m. Qualitative and quantitative changes are described. A depth-related gradient in species diversity and biomass was found at both localities. In general, red algae such as corallines and Pterocladiella capillacea predominated in the shalow sublittoral (5 m) while brown algae such as Zonaria and Stypocaulon were more abundant at 15 m. Multivariate analyses emphasized the existence at each study site of two communities (5 and 15 m depth), separated by a large transition zone. The 15 m community on the south coast site showed the largest number of species (52), whereas the lowest diversity (30 species) also occured at this site in the 5 m community. A clear seasonal pattern of biomass change could be discerned only at São Vicente wherethe highest biomass was recorded in spring-summer. Nomajor inter-annual variations could be detected, indicaring relatively stable communities at least on a short-term basis.