which studies show shallow (weak) clines?

[lizzieinvancouver]

@alinazeng I know I asked before, but this time I will leave the issue open and keep returning to it instead of asking you again (hopefully). Can you tell me about these studies:

1. The Pinus ponderosa (blue or teal color) that has mostly provenance latitudes around 40 and very late dates for spring events?
2. The Fagus sylvatica (green) that has fall events near 300 days and a weak cline
3. The Fraxinus (green) that has fall events near 300 days and a weak cline
4. The Picea engelmannii (green) that has fall events near 300 days and a weak cline

I think before you said some of these were experiments or such? Any guesses you have of what makes them unique from the other studies would be welcome.

Also, I think perhaps we should add the garden IDs to the species names also. So keep the legend as it is (with species and garden separate) but add at the end of each species which garden or gadens it is in (example: Fagus sylvatica (C, D))

[alinazeng]

Hi lizzie,

Thanks for your patience. I hope my responses below answer some of your questions.

1. Pinus ponderosa (green hollow triangles) are from Dixit et al., 2020 in the USA. I think, the spring event dates are very late because this field experiment is done at a higher elevation than other studies (2200m).

2. Fagus sylvatica (Green squares) are from Petkova et al., 2017 in Bulgaria. Their fall events are leaf senescence. Theu explained the weak cline saying "Additionally, Peñuelas et al. (2002); Gordo and Sanz (2009) and Menzel et al. (2006) found that the change in the dates of leaf senescence and fall in the phenological records are slower, more heterogeneous and less consistent than those for leaf unfolding. Our results from 2016 support this statement."

3. Fraxinus excelsior (green circles) are from Rosique-Esplugas 2021 in the UK. Regarding leaf senescence, thyey said "There was no significant interaction between provenance and trial site. Site effect explained 30 per cent of the variance, while provenance explained 15 per cent"

4. Ponderosa engelmannii (purple hollow triangles) are from Rehfeldt 1994, our only greenhouse experiment. After some digging, I realized that the "fall events" we have for that paper are "the day by which seedling elongation had finished"... which isn't a common fall event indicator. Perhaps that's why there are little clines? I included that paper in the first place because Aitken and Bammals (2015) included it.

And yes, I will adjust the legend.

[lizzieinvancouver]

@alinazeng Thanks for this! I think this is all the info I need.

FYI:

the day by which seedling elongation had finished Is weird, but budset is also the day a tree should stop growing, so pretty similar. I think it is okay we included it.