Courtalon P, Bó R F, Spina F, Jiménez N, Cantil L, Fernández R, Porini G
Departamento de Ecología Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
Braz J Biol. 2015 Jan-Mar;75(1):30-8. doi: 10.1590/1519-6984.06813.
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.
本研究的目的是在2006年6月至2008年5月期间，对阿根廷 Entre Ríos 省巴拉那河中游三角洲（MD）湿地的河狸鼠的一些重要繁殖参数进行估算和比较。在河狸鼠的原始分布范围内，MD是该物种栖息地适宜性最高的地区之一。捕获河狸鼠，并按月、季节和年度估算以下繁殖参数：妊娠率（PR）、窝仔数（LS）、总生产力（GP）和年产量（AP）。采用统计非参数检验进行比较。此外，通过将每个胚胎和胎儿归为一个发育阶段类别并考虑该物种的妊娠期，估算其预期出生日期。所有参数均显示出较高的值，并且PR和LS在干旱年份（2006年）和湿润年份（2007年）之间存在显著差异。检测到两个出生高峰，一个在春季，另一个在中秋时节。讨论了这些结果对确保该啮齿动物可持续管理的意义。
