期刊
PLOS ONE
卷 11, 期 12, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0167418
关键词
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资金
- Fondo Nacional de Desarrollo Cientifico y Tecnologico [1090360]
- European Regional Development Funds of the Competitiveness Factors Operational Programme-COMPETE
- national funds of the Foundation for Science and Technology (FCT) [UID/EEA/50009/2013]
- FCT [SFRH/BPD/63703/2009, SFRH/BPD/107878/2015]
Survival is a fundamental demographic component and the importance of its accurate estimation goes beyond the traditional estimation of life expectancy. The evolutionary stability of isomorphic biphasic life-cycles and the occurrence of its different ploidy phases at uneven abundances are hypothesized to be driven by differences in survival rates between haploids and diploids. We monitored Gracilaria chilensis, a commercially exploited red alga with an isomorphic biphasic life-cycle, having found density-dependent survival with competition and Allee effects. While estimating the linear-in-the-parameters survival function, all model I regression methods (i.e, vertical least squares) provided biased line-fits rendering them inappropriate for studies about ecology, evolution or population management. Hence, we developed an iterative two-step non-linear model II regression (i.e, oblique least squares), which provided improved line-fits and estimates of survival function parameters, while robust to the data aspects that usually turn the regression methods numerically unstable.
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