Buscar
Mostrando ítems 11-20 de 1602
Predator occurrence and perceived predation risk determine grouping behavior in guanaco (Lama guanicoe)
(Wiley Blackwell Publishing, Inc, 2018-05)
Grouping behavior of social ungulates may depend on both predator occurrence and perceived predation risk associated with habitat structure, reproductive state, and density of conspecifics. Over 3 years, we studied grouping ...
Heparan sulfates and heparins: similar compounds performing the same functions in vertebrates and invertebrates?
(Associação Brasileira de Divulgação Científica, 1999-05-01)
The distribution and structure of heparan sulfate and heparin are briefly reviewed. Heparan sulfate is a ubiquitous compound of animal cells whose structure has been maintained throughout evolution, showing an enormous ...
Structure of wetland-breeding anuran assemblages from the southern section of the Paraná river, Argentina
(British Herpetological Society, 2009-10)
Knowledge of anuran reproduction is necessary to understand the organization of their communities and is a first step in developing management strategies in order to conserve amphibian diversity. We studied the reproduction ...
Canopy cover as the key factor for occurrence and species richness of subtropical stream green algae (Chlorophyta)
(2017-01-01)
Understanding how local and regional environmental factors influence species richness remains a key issue in ecology. Green algae (Chlorophyta) are a diverse and widely occurring group, which may be a good model for studying ...
Evolutionary history of the calcareous sponge Clathrina aurea: genetic connectivity in the Western Atlantic and intriguing occurrence in the Eastern Pacific
(Springer, 2021)
Clathrina aurea was considered endemic to Brazil before being recorded from the Pacific (Peru) and the Caribbean Sea. We assessed the morphological variability, phylogeographic pattern and population genetic structure of ...
Comparative chromosomal analyses in species of the genus Pimelodella (Siluriformes, Heptapteridae): occurrence of structural and numerical polymorphisms
(UNIV FLORENCE BOTANY INST, 2010)
Cytogenetic analyses were carried out in five species of Pimelodella from the main sub-basins of Upper Parana River and Paraiba do Sul River. The diploid number ranged from 2n = 46 to 2n = 58 chromosomes, and all populations ...
Characterization of vegetation structure in areas of natural occurrence of Hancornia speciosa Gomes
(2021-01-01)
The mangabeira (Hancornia speciosa Gomes) has great food and pharmaceutical values but its production is almost entirely made by people gathering fruits in forests, which increases the risk extinction, particularly in ...
Mosquito (Diptera: Culicidae) assemblages associated with Nidularium and Vriesea bromeliads in Serra do Mar, Atlantic Forest, Brazil
(BIOMED CENTRAL LTDLONDON, 2012)
Background: The most substantial and best preserved area of Atlantic Forest is within the biogeographical sub-region of Serra do Mar. The topographic complexity of the region creates a diverse array of microclimates, which ...
Structure and co-occurrence patterns in microbial communities under acute environmental stress reveal ecological factors fostering resilience
(Nature Publishing Group, 2018)
Understanding the factors that modulate bacterial community assembly in natural soils is a longstanding challenge in microbial community ecology. In this work, we compared two microbial co-occurrence networks representing ...