Brown howler monkeys ( Alouatta guariba ) are increasingly threatened by habitat loss, sylvatic yellow fever, and negative human interactions. In southern Brazil, brown howlers still inhabit some fragments of the endangered Araucaria Pine Forest (APF), but basic information on their social organization remains scarce. We surveyed brown howler monkey groups to assess their group size and composition in three nearby similarly si...

The American manatee ( Trichechus manatus ) requires freshwater mainly from rivers and springs to maintain osmoregulatory balance in saline environments. However, in Brazil's semi‐arid Potiguar Basin, manatees now rely solely on submarine freshwater springs because hypersaline estuaries have become unsuitable sources of freshwater. We applied MaxEnt modeling to presence‐only data (sightings and filtered telemetry records) to p...

Introduction This study investigates the size composition of Brachyplatystoma vaillantii specimens caught by the Amazon industrial fleet, identifying spatiotemporal patterns and assessing the vulnerability of juveniles to fishing. Methods The research was conducted at the Amazon River mouth, using data collected by onboard scientific observers between 2008 and 2011, including catch records and length sampling of goliath catfis...

Temperature and light intensity are among the most influential environmental factors modulating cyanobacterial physiology, yet their interactive effects on metabolite accumulation remain understudied in several genera with biotechnological potential. In this study, the influence of temperature (12, 20 and 28 °C) and light intensity (60, 120 and 180 µmol photons m −2 s −1 ) on the growth, pigment profile, and lipid composition...