Table 2.

Outline of predictions for range‐limit theory (RLT) and interactive range‐limit theory (iRLT)

	High‐latitude/altitude limit	Low‐latitude/altitude limit
Predictions of factors causing range limits
RLT	Negative abiotic factors	Negative biotic interactions
iRLT	Negative abiotic factors AND Positive biotic factors	Negative biotic interactions AND Positive abiotic factors
Predictions for contraction along range limits
RLT	Negative abiotic factors increase	Negative biotic interactions increase
iRLT	Negative abiotic factors increase AND/OR Positive biotic factors decrease	Negative biotic interactions increase AND/OR Positive abiotic factors decrease
Predictions for expansion along range limits
RLT	Negative abiotic factors decrease	Negative biotic interactions decrease
iRLT	Negative abiotic factors reduce AND/OR Positive biotic factors increase	Negative biotic interactions reduce AND/OR Positive abiotic factors increase