Simulate number of eggs per fish — make

Function used to simulate number of eggs produced per female (potential annual fecundity, PAF), for rivers included in get_rivers.

Usage

make_eggs(river, species = c("AMS", "ALE", "BBH"), custom_habitat = NULL)

Arguments

river: The river for which eggs will be simulated.
species: Species for which population dynamics will be simulated. Choices include American shad ("AMS"), alewife ("ALE"), and blueback herring ("BBH").
custom_habitat: A dataframe containing columns corresponding to the those in the output from custom_habitat_template(). NEED TO ADD LINK.

Value

A vector containing age-specific potential annual fecundity with length = max_age.

Details

The default method for American shad uses predictive equations from Olney and McBride (2003) to simulate batch fecundity from weight-fecundity relationships using coefficients in olney_mcbride for the life-history region corresponding to the specified river. Number of batches for this approach is currently drawn from a random normal distribution with a mean of 6.7 and a standard deviation of 2.1 (McBride et al. 2016).

I need to add details for default methods for ALE and BBH...

References

Olney, J. E. and R. S. McBride. 2003. Intraspecific variation in batch fecundity of American shad (Alosa sapidissima): revisiting the paradigm of reciprocal latitudinal trends in reproductive traits. American Fisheries Society Symposium 35:185-192.

McBride, R. S., R. Ferreri, E. K. Towle, J. M. Boucher, and G. Basilone, G. 2016. Yolked oocyte dynamics support agreement between determinate- and indeterminate-method estimates of annual fecundity for a northeastern United States population of American shad. PLoS ONE 11(10): 10.1371/journal.pone.0164203

Examples

make_eggs(river="Susquehanna", species = "AMS")
#>  [1]  15099.38  79127.13 169263.47 251924.78 313956.41 355901.33 382686.26
#>  [8] 399244.67 409291.43 415321.23 418917.13 421053.53 422320.01