47 research outputs found
Common barriers, but temporal dissonance: Genomic tests suggest ecological and paleoâlandscape sieves structure a coastal riverine fish community
Assessments of spatial and temporal congruency across taxa from genetic data provide insights into the extent to which similar processes structure communities. However, for coastal regions that are affected continuously by cyclical seaâlevel changes over the Pleistocene, congruent interspecific response will not only depend upon codistributions, but also on similar dispersal histories among taxa. Here, we use SNPs to test for concordant genetic structure among four codistributed taxa of freshwater fishes (Teleostei: Characidae) along the Brazilian Atlantic coastal drainages. Based on population relationships and hierarchical genetic structure analyses, we identify all taxa share the same geographic structure suggesting the fish utilized common passages in the past to move between river basins. In contrast to this strong spatial concordance, modelâbased estimates of divergence times indicate that despite common routes for dispersal, these passages were traversed by each of the taxa at different times resulting in varying degrees of genetic differentiation across barriers with most divergences dating to the Upper Pleistocene, even when accounting for divergence with gene flow. Interestingly, when this temporal dissonance is viewed through the lens of the speciesâspecific ecologies, it suggests that an ecological sieve influenced whether species dispersed readily, with an ecological generalist showing the highest propensity for historical dispersal among the isolated rivers of the Brazilian coast (i.e., the most recent divergence times and frequent gene flow estimated for barriers). We discuss how our findings, and in particular what the temporal dissonance, despite common geographic passages, suggest about past dispersal structuring coastal communities as a function of ecological and paleoâlandscape sieves.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/154255/1/mec15357_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154255/2/mec15357.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/154255/3/mec15357-sup-0001-Supinfo.pd
AçÔes do Projeto âAçÔes Construtivas do Conhecimento QuĂmicoâ e Suas ContribuiçÔes PedagĂłgicas na Cidade de Manaus - AM
NESTE TRABALHO SĂO RELATADAS AS CONTRIBUIĂĂES QUE O PROJETO AĂĂES CONSTRUTIVAS DO CONHECIMENTOQUĂMICO NAS ESCOLAS PĂBLICAS TROUXE PARA A VIDA ESCOLAR DOS ESTUDANTES DO ESTADO DO AMAZONAS, SUBRETUDO EM SUA CAPITAL, MANAUS. O PROJETO ACONTECE DESDE OUTUBRO DE 2011, EM 7 ESCOLAS-SEDE, CONTEMPLANDO TODAS AS REGIĂES GEOGRĂFICAS DO MUNICĂPIO. 300 ESTUDANTES, DO PRIMEIRO E SEGUNDO ANO DO ENSINO MĂDIO, ORIUNDOS DE 20 ESCOLAS, SĂO ATENDIDOS PELO PROJETO. AS AULAS SĂO MINISTRADAS POR LICENCIANDOS E BACHARĂIS EM QUĂMICA DA UNIVERSIDADE FEDERAL DO AMAZONAS, E QUE SĂO ORIENTADOS POR SUPERVISORES LICENCIADOS E COM ATUAĂĂO NO ENSINO DE QUĂMICA. O PROJETO AINDA CONTA COM UMA COORDENAĂĂO NACIONAL E OUTRA NO AMAZONAS, COM AULAS SEMANAIS NAS ESCOLAS-SEDE E REUNIĂES DA EQUIPE NA UFAM. AS ATIVIDADES PERMITEM TRABALHAR SIMULTANEAMENTE FORMAĂĂO INICIAL E CONTINUADA DE PROFESSORES DE ENSINO MĂDIO, ALĂM DO APROFUNDAMENTO EM QUĂMICA QUE OS ALUNOS DE ENSINO MĂDIO DE TODAS AS REGIĂES DE MANAUS TĂM ACESSO. NESTE TRABALHO RELATAMOS, SOBRETUDO, O IMPACTO DAS AĂĂES NA FORMAĂĂO INICIAL DOS MONITORE