Effective population size of broad-snouted caiman (Caiman latirostris) in Brazil: A historical and spatial perspective

Autor(es)

Zucoloto, Rodrigo Barban ^[1] ; Bomfim, Gilberto Cafezeiro ^[1] ; Fernandes, Flora Maria de Campos ^[1] ; Schnadelbach, Alessandra Selbach ^[2] ; Pina, Carlos Ignacio ^[3] ; Verdade, Luciano M. ^[4]

Afiliação do(s) autor(es)

^[1] Fed Univ Bahia UFBA, Inst Biol, Lab Populat Genet & Mol Evolut GENEV, Salvador, BA - Brazil

^[2] Fed Univ Bahia UFBA, Inst Biol, Lab Genet & Evolut Plants LAGEV, Salvador, BA - Brazil

^[3] CONICET Prov ER UADER, CICYTTP, Fac Ciencia & Tecnol Mat & Espana, RA-3105 Diamante, Entre Rios - Argentina

^[4] Univ Sao Paulo, CENA, LE2AVe, POB 96, BR-13416000 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GLOBAL ECOLOGY AND CONSERVATION; v. 28, AUG 2021.
• Citações Web of Science: 0

Resumo

Caiman latirostris has a large geographic distribution, that includes Argentina, Bolivia, Brazil, Paraguay, and Uruguay. In Brazil illegal hunting and land use change have caused population decline, relatively well documented in the last three decades. Due to such circumstances, the estimate of species effective population size might help analyze its viability. Single-sample estimator was used to estimate current effective population size (Ne) of broad-snouted caiman populations in representative areas of the species range in Brazil. For the analyzes, genotypes previously obtained were used for subpopulations of the captive colony of the University of Sa similar to o Paulo (USP) and for wild subpopulations. The microsatellites used were Ami mu 8, Ami mu 11, Ami mu 13, Ami mu 20, Cla mu 2, Cla mu 5, Cla mu 6, Cla mu 7, Cla mu 8, Cla mu 9 and Cla mu 10. The 11 loci analyzed produced 18.27 alleles on average. Wild populations showed significant genic and genotypic differentiation among them (p < 0.01). Population structure analyses (Rho-statistics) at Genepop for all loci was 0.376. The effective number of population sizes (0, the Ne estimator of Migrate-n software) of Caiman latirostris populations from the captive colony at the USP was 117.1 (N = 7) for NRF, 115.2 (N = 4) for Fm1, and 107.5 (N = 4) for Fm5, on the oposite side, the mean value of theta (0) was 7.7 (N = 51) for the Atlantic SE basin wild population, 9.4 (N = 42) for the Atlantic N/NE basin wild population and 9.6 (N = 91) for the Paran ` a basin wild population. The mean number of migrants (M of Migrate-n software) varied from 1.7 to 1.9 estimated by migrate-n are comparable to 1.3 estimated by Genepop. It is observed that in most wild population only few adults effectively contribute to genetic variation. The following guidlines are proposed as management (AU)

• Processo FAPESP: 17/01304-4 - Fauna em paisagens agrícolas: padrões e processos
• Beneficiário: Luciano Martins Verdade
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 99/02605-8 - Desenvolvimento de sequências de DNA microssatélite para estudo de populações remanescentes de jacaré-de-papo-amarelo (Caiman latirostris) da região central do estado de São Paulo
• Beneficiário: Rodrigo Barban Zucoloto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 00/01495-3 - Biologia da reprodução e do crescimento em jacarés-de-papo-amarelo (Caiman latirostris) em cativeiro
• Beneficiário: Luciano Martins Verdade
• Modalidade de apoio: Auxílio à Pesquisa - Regular