Pollination farm yield seasons

Software Support
1

Dear users,
I need to use the pollination model to get the potential pollination service on two different crops, flowering on two different seasons.
I am getting zero values on the pdep_y_w and y_wild outputs when I set to zero the fr_[SEASON], and I don’t understand why.

To illustrate the problem I will use the dataset provided with the software, and show the different tests I made.

I only changed the farm.shp file. This is the output :
image

If I want the crops to flower only during one season, I set the other fr_[SEASON] to zero.
image
The almond farm has pollinators (p_abund > 0) but y_wild is 0.

Then I tried to set both crops fr_summer to 1, keeping the almond season set to spring
image
In the almond farm the p_abund is 0 but yet the y_wild is positive.

If I set both crops fr_spring to 1 and fr_summer to 0

image
image1324×100 5.66 KB

It seems only the fr_summer is taken into account to compute y_wild ?
Is it a normal behavior ? Is there something that I am missing ?
I am using the version 3.15.1.

Best regards

2

Hi,
I tried investigating the possible source of the problem.
Using the dataset provided, and :

  • setting to zero the fr_summer for almonds (which is supposed to be pollinated during spring) and to zero the fr_spring for blueberries.
  • adding a season named “z”, for which floral resources of both almonds and blueberries are set to zero.

I get a positive p_abund on farm_results but a nul pdep_y_w and y_wild for both crops.
Looking at the intermediate outputs :

  • half_saturation_[season] seems correct for both spring and summer
  • total_pollinator_abundance_[season] also seems correct for both spring and summer
  • farm_pollinator_[season] is zero for both spring and summer and both crops

So, I suspect there might be a problem with the computation of farm pollinator abundance (FP_season).

Is there someone in the software support team that could look into this, or tell me if I am missing something ?

Thank you for your support.

3

Hi @Gaelle , thanks for describing the issue in detail. It does sound like it could be a bug. I will try to reproduce the problem.

4

Hi Dave,
Thank you for looking into this, I look forward to hearing from you.
Best regards

5

Hi @Gaelle , I think you are correct that this is a bug where only one of the seasons was contributing to the on-farm pollinator abundances. Pollination seasonal on-farm abundance uses the wrong season · Issue #2038 · natcap/invest · GitHub

I believe I have fixed this issue in a development build, if you would like to try it out.
Mac Installer
Windows Installer