Data on life history traits for the tobacco hornworm Manduca sexta
data(hornworm)An object of class "asterdata" (see asterdata)
comprising records for 162 insects (54 female, 68 male, and 40 for which
there was no opportunity to determine sex) observed over 40 days.
Nodes of the graph for one individual are associated with the variables
(levels of the factor hornworm$redata$varb) in dependence groups
Bernoulli. Predecessor 1 (initial node). Indicator of pupation.
Three-dimensional multinomial dependence group.
Predecessor P.
Zero-truncated Poisson. Predecessor T332.
Count of ovarioles on day 33. Only females have this node in their
graphs.
For x = 34, ..., 40. Two-dimensional multinomial
dependence group. Predecessor Tw1, where w = x - 1.
Zero-truncated Poisson. Predecessor Tx2.
Count of ovarioles on day x. Only females have these nodes in
their graph.
Covariates are
a factor. F is known female, M is known male,
U is unknown (no opportunity to observe).
time (in weeks) to reach the 2nd instar stage. Larval instars are stages between molts (shedding of exoskeleton) of the larval form (caterpillar).
mass (in grams) at the 2nd instar stage.
mass (in grams) at eclosion.
name of an individual in the original data.
This is the data described by and analyzed by non-aster methods by Kingsolver et al. (2012) and re-analyzed using this package by Eck et al. (submitted).
For an illustration of the graph, see Figure 1 in Eck et al. (submitted).
In the description above, a concrete example of the x and w
notation is that T351 and T352 form a two-dimensional multinomial dependence
group, the predecessor of which is T341, and B35 is a dependence group all
by itself, its predecessor being T352.
Every multinomial dependence group acts like a switch. If the predecessor
is one, the dependence group is multinomial with sample size one (exactly
one variable is one and the rest are zero). So this indicates which way
the life history goes. If the predecessor is zero, then all successors are
zero. This goes for all variables in any aster model. If Tx2 is zero,
then so is Bx. The ovariole count is zero except for the day on
which the individual eclosed.
Kingsolver, J. G., Diamond, S. E., Seiter, S. A., and Higgins, J. K. (2012) Direct and indirect phenotypic selection on developmental trajectories in Manduca sexta. Functional Ecology 26 598--607.
Eck, D., Shaw, R. G., Geyer, C. J., and Kingsolver, J. (submitted) An integrated analysis of phenotypic selection on insect body size and development time.
data(hornworm)
names(hornworm)
names(hornworm$redata)
levels(hornworm$redata$varb)
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