hornworm {aster2} | R Documentation |

## Life History Data on Manduca sexta

### Description

Data on life history traits for the tobacco hornworm
*Manduca sexta*

### Usage

`data(hornworm)`

### Format

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

- P
Bernoulli. Predecessor 1 (initial node). Indicator of pupation.

- T330, T331, T332
Three-dimensional multinomial dependence group. Predecessor

`P`

.

- T330
Indicator of death after pupation. In these data, all deaths after pupation are considered to have happened on day 33 regardless of when they occurred (because the actual day of death was not recorded in the original data).

- T331
Indicator of survival to day 33 but still pre-eclosion.

- T332
Indicator of eclosion (emergence from pupa as adult moth on day 33.

- B33
Zero-truncated Poisson. Predecessor

`T332`

. Count of ovarioles on day 33. Only females have this node in their graphs.- Tx1, Tx2
For

`x`

= 34, ..., 40. Two-dimensional multinomial dependence group. Predecessor`Tw1`

, where`w = x - 1`

.

- Tx1
Indicator of survival to day

`x`

but still pre-eclosion.- Tx2
Indicator of eclosion (emergence from pupa as adult moth on day

`x`

.

- Bx
Zero-truncated Poisson. Predecessor

`Tx2`

. Count of ovarioles on day`x`

. Only females have these nodes in their graph.

Covariates are

- Sex
a factor.

`F`

is known female,`M`

is known male,`U`

is unknown (no opportunity to observe).- Time_2nd
time (in weeks) to reach the 2nd instar stage. Larval instars are stages between molts (shedding of exoskeleton) of the larval form (caterpillar).

- Mass_2nd
mass (in grams) at the 2nd instar stage.

- Mass_Repro
mass (in grams) at eclosion.

- LarvaID
name of an individual in the original data.

### Details

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.

### Source

Joel Kingsolver http://bio.unc.edu/people/faculty/kingsolver/

### References

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.

### Examples

```
data(hornworm)
names(hornworm)
names(hornworm$redata)
levels(hornworm$redata$varb)
```

*aster2*version 0.3 Index]