Statistical analysis In order to investigate the degree of similarity in the bird community com- position richness and abundance among islands the general survey data on species composition from the islands surveyed were subjected to a multivariate analysis with an ordination technique called semi-strong Hybrid Multi- dimensional Scaling HMDS that is available in the program PATN Belbin Revista Brasileira de Biologia. Because of this it should be protected and preserved to guarantee the pristine habitats that maintain high diversity of bird species and those endemic of the Amazon region. The avifauna of the Brazilian state of Roraima. The MDS analysis was used to generate a single ordination of bird species within sites. 
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However, the Anavilhanas archipelago is unique in the Amazon, and has its own avifauna, which is distinct from the neighboring forests and also distinct from other island bigodunho studied in the region.
The status of North Cantadof migrants in central Amazonian Brazil. Jr and Parker T. All bird species recorded, both through quantitative surveys and scattered observations, are presented in Table 1.
Results We recorded bird species for the Anavilhanas Ecological Station including the data from visual surveys of many 10 km transects by boat, netting transects on islands and the mainland, and the results of sporadic surveys conducted in Habitat selection in Amazonian Birds.
Ordination MDS of islands open circles and mainland sites black circlesbased on mist net captures see Figure 1 for area locations. A Guide to the Birds of Venezuela.
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A mini- mum of one bird species was recorded at mainland sites site 25 and a max- imum of 88 bird species site b. Marina Antongiovanni provided the satellite image for the map. Enter the email address you signed up with and we'll email you a reset link. To avoid confounding the results of our comparison, we do not include these sites, which were not surveyed using the same methods, and will discuss their avifauna elsewhere.
He found a similar pattern of distribution for island birds in northeastern Peru and bitodinho suggested that the majority of most habitat specialized species were obligate island spe- cies.
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Rosenberg also presents a list of bird species occurring in river islands in eastern Peru and southern Colombia.
Log In Sign Up. It is generally observed that each recognizable plant community habitat has some bird species unique to it, consistent with the idea of conspicuous habitat special- ization in the tropics Willis ; Terborgh ; Bierregaard ; Terborgh et al.
A total of bird species was found for Anavilhanas including a survey done in Academic Press, New York, pp. Princeton University Press, Princeton, N.
Ordination MDS of island open circles and mainland river margins black circles; sites 24—26 overlapped in the analysis and are shown togetherbased on 10 km transect see methods. Spatial distribution and habitat of the Anavilhanas Archipelago bird community in the Brazilian Amazon.
In the entire Anavilhanas Station area the families Tyrannidae and Thamnophilidae showed the highest richness with 38 An evaluation of the relative robustness of techniques for ecological ordina- tion.
Pergamon Press, Oxford, pp.
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Prance and Lovejoy T. Most islands, which range from less than one km to ca.
The physical and chemical properties of Amazonian waters and their relationships with the biota. The closer points are to one another in the graph, the more similar are their bird species composition. More details on Amazonian habitat characteristics and descriptions are available in SioliPires and Prance and Parolin et al.
Rosenberg studied the bird community of two islands in a natural environment of white water river islands, one from the Amazon river and another from the Napo river in the Peruvian Amazon. Populations on the majority of 1-ha islands had just one pair of bird per species which they think was the result of colo- nization to replenish individuals that had dispersed or died.
Breeding and migrating birds in an Amazonian Savanna.
The matrix was constructed with all bird species observed on the eight islands in which we ran eight 10 km tran- sects. Discussion Some bird species not well known or with a limited distribution in the Amazon region are relatively frequently encountered in Anavilhanas, among these are Figure 3. For the island sites the families Tyrannidae 16 speciesThamnophilidae 9 species and Thra- upidae 9 species were the most representative in species richness See also Table 1.
The islands are also used by migrant birds e. Using standardized protocols mist-netting and boat-based transect censuseswe examine the following questions:
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