  We performed a systematic study of the temperature- and field-dependence of
magnetization and resistivity of Gd2PdSi3, which is a centrosymmetric skyrmion
crystal. While the magnetization behavior is consistent with the reported phase
diagram based on susceptibility, we show that a phase diagram can also be
constructed based on the anomalous magnetoresistance with one-to-one
correspondence among all the features. In addition, the crossover boundary into
the field-induced ferromagnetic state is also identified. Our results suggest
that the ferromagnetic spin fluctuations above the N\'eel temperature play a
key role in the high sensitivity of the resistivity anomalies to magnetic
field, pointing to the rich interplay of different magnetic correlations at
zero and finite wave vectors underlying the skyrmion lattice in this frustrated
itinerant magnet.
