Effects of Abiotic Factors on the Geographic Distribution of Body Size Variation and Chromosomal Polymorphisms in Two Neotropical Grasshopper Species (Dichroplus: Melanoplinae: Acrididae)

Table 1

Correlation coefficients and their statistical significance between an estimator of body size (BL: body length) and several geographic and environmental predictors for males (M) and females (F) of two grasshopper species.

Variable*	Correlation coefficient (P)
	Dichroplus pratensis		Dichroplus vittatus
	log10MBL	log10FBL	log10MBL	log10FBL
LAT	−0.70 (<0.001)	−0.76 (<0.001)	−0.64 (0.003)	−0.65 (0.003)
ALT	−0.39 ns	−0.51 (<0.001)	ns	ns
TMEAN	0.71 (<0.001)	0.65 (<0.001)	0.52 (0.021)	0.60 (0.006)
TMAX	0.70 (<0.001)	0.63 (<0.001)	ns	ns
TMIN	0.59 (0.002)	0.53 (0.007)	0.58 (0.010)	0.70 (0.001)
CVT	ns	ns	−0.67 (0.002)	−0.75 (<0.001)
TMm	0.73 (<0.001)	0.44 (0.029)	ns	ns
PANNU	0.56 (0.004)	0.40 (0.044)	ns	ns
PMAX	0.43 (0.031)	0.42 (0.039)	ns	ns
PMIN	0.48 (0.014)	ns	−0.53 (0.020)	−0.50 (0.028)
CVP	ns	ns	0.56 (0.012)	0.52 (0.024)
PMm	0.49 (0.013)	0.42 (0.039)	0.47 (0.043)	ns
PET	0.59 (0.002)	0.48 (0.016)	ns	0.46 (0.047)
AET	0.48 (0.014)	0.50 (0.011)	ns	ns
WB	ns	ns	ns	ns

*LAT: latitude in decimal degrees; ALT: altitude in metres above sea level; TMEAN: mean annual temperature (in Celcius degrees); TMAX: mean annual maximum temperature; TMIN: mean annual minimum temperature; CVT: coefficient of variation of TMEAN; TMm: mean difference between maximum and minimum monthly temperatures; PANNU: total annual precipitation (in mm/year); PMAX: mean maximum monthly precipitation; PMIN: mean minimum monthly precipitation; CVP: coefficient of variation of PANNU; PMm: mean difference between maximum and minimum monthly precipitation; PET: potential evapotranspiration (the Priestley-Taylor equation); AET: actual evapotranspiration (the Thornthwaite formula); WB: water balance; ns = non-significant.