Data from: Improving structured population models with more realistic representations of non-normal growth ...

• Main Authors: Peterson, Megan L., Morris, William, Linares, Cristina, Doak, Daniel
• Format: Dataset
• Language: English
• Published: Dryad 2019
• Subjects: Bistorta vivipara; Vulpicida pinastri; skewed normal; Polygonum viviparum; matrix model; Asymmetry; Beta regression; integral projection model; quantile regression; population model; skew; Paramuricea clavata
• Online Access: https://dx.doi.org/10.5061/dryad.t6c3573; https://datadryad.org/stash/dataset/doi:10.5061/dryad.t6c3573

1. Structured population models are among the most widely used tools in ecology and evolution. Integral projection models (IPMs) use continuous representations of how survival, reproduction, and growth change as functions of state variables such as size, requiring fewer parameters to be estimated than projection matrix models (PPMs). Yet almost all published IPMs make an important assumption: that size-dependent growth transitions are or can be transformed to be normally distributed. In fact, many organisms exhibit highly skewed size transitions. Small individuals can grow more than they can shrink, and large individuals may often shrink more dramatically than they can grow. Yet the implications of such skew for inference from IPMs has not been explored, nor have general methods been developed to incorporate skewed size transitions into IPMs, or deal with other aspects of real growth rates, including bounds on possible growth or shrinkage. 2. Here we develop a flexible approach to modeling skewed growth data ... : Bistort raw dataDemographic data for Polygonum viviparum collected at Niwot Ridge, CO from 2001-2011. szs0 = size at time t, szs1 = size at time t+1, bulbs0 = number of bulbils produced at time t. Details of data collection given in the supporting information.Gorgonian raw dataDemographic data for Paramuricea clavata collected in the NW Mediterranean Sea from 1999-2004. Mortality = source of mortality, Site = site, Plot = plot, Year = annual transition from time t to time t+1, Ncol = colony id, Size = size at time t, Sizenext = size at time t+1, Survnext = dead (0) or alive (1) at time t+1. Details of data collection and reproduction given in supporting information.Vulpicida raw dataDemographic data for Vulpicida pinastri collected in Kennicott Valley, AK from 2004-2009. Year = year at time t, site = site, t0 = size at time t, t1 = size at time t+1, repro = number of offspring assigned based on thallus circumference, survival = dead (0) or alive (1) at time t+1. Details of data collection and reproduction ...