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Microhabitat segregation and fine ecomorphological dissimilarity between two cl...
Leitão, Rafael Pereira; Sánchez-Botero, Jorge Ivan; Kasper, Daniele; Cardoso, Victor Trivério; Araújo, Carolina Morais; Zuanon, JansenHabitat segregation is considered the mostprevalent resource-partitioning mechanism for streamfishes and the species morphology can be a strongpredictor of their spatial distribution. However, moststudies addressing morphology-habitat relationshipshave defined the space in physiognomically homoge-neous units (i.e., mesohabitat), probably not detectingsegregation among several closely related species. Herewe inv...
Mercury distribution in different tissues and trophic levels of fish from a tro...
Kasper, Daniele; Palermo, Elisabete Fernandes Albuquerque; Dias, Ana Carolina Monteiro Iozzi; Ferreira, Gustavo Luiz; Leitão, Rafael PereiraConcentrations of organic (OrgHg) and inorganic mercury (InorgHg) were assessed in different fish tissues (liver, muscle, kidney, gut and gonads) and trophic levels collected in an impacted tropical reservoir in southeastern Brazil. Organic mercury concentrations in muscle were remarkably higher in the carnivorous species Hoplias malabaricus and Oligosarcus hepsetus. The ratios of OrgHg in relation to total mer...
Methodologies for sampling, preservation and storage of water samples for mercu...
Kasper, Daniele; Forsberg, Bruce Rider; Almeida, Ronaldo de; Bastos, Wanderley Rodrigues; Malm, OlafKnowing the mercury levels of an environment allows a diverse array of biogeochemical studies into the mercury cycle on a local or global scale. Among matrices commonly evaluated, water remains a challenge for research because its mercury levels can be very low, requiring development of complex analytical protocols. Currently, sample preservation methods, protocols that avoid contamination, and analytical techn...
Disentangling the pathways of land use impacts on the functional structure of f...
Leitão, Rafael Pereira; Zuanon, Jansen; Mouillot, David; Leal, Cecília Gontijo; Hughes, Robert Mason; Kaufmann, Philip Robert; Vill?ger, S?bastienAgricultural land use is a primary driver of environmental impacts on streams. However, the causal processes that shape these impacts operate through multiple pathways and at several spatial scales. This complexity undermines the development of more effective management approaches, and illustrates the need for more in-depth studies to assess the mechanisms that determine changes in stream biodiversity. Here we ...