title: Reproductive ecology of coypu (Myocastor coypus Molina, 1782) in the Middle Delta of the Paraná River, Argentina.
abstract: The objective of this study was to estimate and compare some important reproductive parameters of Myocastor coypus over time (June 2006-May 2008), in wetlands of the Middle Delta of the Paraná River (MD) Entre Ríos province, R. Argentina. Within the original coypu distribution range, the MD is among the areas of highest habitat suitability for the species. Coypus were captured and the following reproductive parameters were estimated on a monthly, seasonal and annual basis: pregnancy rate (PR), litter size (LS), gross productivity (GP) and annual production (AP). Statistical non-parametric tests were used for comparisons. Additionally, the expected birth date of each embryo and fetus was estimated by assigning it to a developmental stage category and considering the gestation period of the species. All the parameters showed high values and PR and LS differed significantly between the dry (2006) and humid years (2007). Two peaks of birth were detected, one in spring and another one in mid-autumn. The implications of these results for ensuring the sustainable management of this rodent are discussed.
authors.affiliation: Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: P
authors.initials: P
authors.lastname: Courtalon
authors.affiliation: Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: R F
authors.initials: RF
authors.lastname: Bó
authors.affiliation: Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: F
authors.initials: F
authors.lastname: Spina
authors.affiliation: Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: N
authors.initials: N
authors.lastname: Jiménez
authors.affiliation: Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: L
authors.initials: L
authors.lastname: Cantil
authors.affiliation: Dirección General de Recursos Naturales, Forestación y Economías Alternativas de Entre Ríos, Paraná, Entre Ríos, Argentina.
authors.forename: R
authors.initials: R
authors.lastname: Fernández
authors.affiliation: Dirección de Fauna Silvestre, Secretaría de Ambiente y Desarrollo Sustentable de la Nación, Ciudad Autónoma de Buenos Aires, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Porini
mesh_terms: D000818:Animals; D001118:Argentina; D005260:Female; D008297:Male; D011247:Pregnancy; D012098:Reproduction / Q000502:physiology*; D045483:Rivers; D012377:Rodentia / Q000145:classification / Q000502:physiology*; D012621:Seasons