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Extracts of embryonic chick brain, heart, and liver agglutinate glutaraldehyde-fixed trypsinized or pronase-treated rabbit erythrocytes. Agglutination activity of extracts from each organ was inhibited by a number of saccharides. Lactose was the most potent saccharide inhibitor of those tested. The specific agglutination activity of the extracts from each of the organs studied changed with development of the embryo. In general, specific agglutination activity declined later in embryogenesis, and after hatching. However, the pattern of developmental change differed for each of the organs tested. Liver was unusual in that, after hatching, agglutination activity rose again; and the agglutinin found at this time was apparently different from that found in the embryo. 相似文献
403.
404.
Sergio R. Floeter Werther Krohling João Luiz Gasparini Carlos E. L. Ferreira Ilana R. Zalmon 《Environmental Biology of Fishes》2007,78(2):147-160
Patterns of community structure in the marine environment are strongly influenced by population relationships to biotic and
physical gradients. The aim of this work is to explore the relationships of tropical rocky reef fish assemblages to wave exposure
and benthic coverage in a gradient of distance from the coast. The study was conducted on the Guarapari Islands, southeastern
Brazilian coast. Fish were sampled by underwater visual census (166 transects) and benthic cover was estimated with quadrats
(223 replicates). Two main kinds of habitats were found to be derived from the close interrelation between exposure and benthic
coverage: (1) exposed areas subjected to major hydrodynamic forcing, and (2) sheltered or moderately exposed areas. The first
group is associated with mid-water schooling species like planktivorous labrids and Chromis, piscivorous Caranx, as well as gregarious omnivores like Abudefduf and Diplodus. In terms of benthic composition, macroalgae and encrusting calcareous algae prevail in this high-energy habitat. The second
group is characterized by site-attached and reef associated species like territorial pomacentrids, invertebrate feeders such
as Halichoeres poeyi and Chaetodon striatus, and small cryptobenthic fishes (e.g. blenniids and labrisomids). Turf algae, zoanthids and massive corals dominate this
environment. Environmental plasticity is also common with some genera showing high abundances in all habitats (e.g. Holocentrus, Haemulon, Acanthurus). Examples of the coupling of food availability and fish abundance were found. Planktivores, territorial herbivores, macroalgae
browsers and spongivores were positively related with the abundance of their preferred food items along the exposure gradient.
Within-family analyses of Pomacentridae and Labridae showed that niche partitioning is likely occurring and seems to be mediated
by swimming ‘ability’ and associated feeding performance. 相似文献