I have doubts about what family distribution and link function I should choose. I think my response variables seems to have a gamma distribution, but I think it's not correct (or even possible) to run the code with gamma family when you have negative values of your response variable. I'm using R software to deal with this model.

I'm pretty rookie with these types of models and I would be so greatfull if somebody could help me out with this situation.

**Figure 1.**Response variable (rates of change in basal area (m2/ -ha-1 /year-1))

**Figure 2.**First predictor variable (Basal area (m2/ -ha-1))

**Figure 3.**Second predictor variable (Drought intensity)

**Figure 4.**Third predictor variable (Change in drought intensity(ºC))