Amazilia tzacatl


To elaborate our model we removed uncertain localities such as those with no coordinates and all records with coordinates laying down in sites with estimated elevations above 2,100 m.

The habitat suitability model generated in Maxent showed areas suitable in climatic terms for this species in the southern portions of the Amazonic slope of the Eastern Andes and some areas east of the Andes in Arauca and in the far east Amazon. These areas are not known to be occupied by the species and were excluded from the potential distribution map of this hummingbird.

Assuming that the distribution of the species may have filled the complete climatic model generated, its distribution today in remnants of forest is about 147,487 km2, which corresponds to a loss of 67 % of its potential original distribution due to deforestation. Nonetheless, this species favours edges, secondary vegetation and plantations and therefore possibly deforestation has not negatively affected greatly its populations.

A new subspecies was recently described in 1999, A. t. brehmi Weller & Schuchmann, 1999, distributed in southwest Andes of Colombia in the Rio Guiza in Nariño. We do not have any specimens reidentified in BioMap as such and therefore abstained from including it here in our maps.


Regularized training gain is 1.002, training AUC is 0.880, unregularized training gain is 1.120.

Algorithm converged after 1880 iterations (99 seconds).

The follow settings were used during the run:

1580 presence records used for training.

11566 points used to determine the Maxent distribution (background points and presence points).

Environmental layers used (all continuous): bio10co bio11co bio12co bio13co bio14co bio15co bio16co bio17co bio18co bio19co bio1co bio2co bio3co bio4co bio5co bio6co bio7co bio8co bio9co

Regularization values: linear/quadratic/product: 0.050, categorical: 0.250, threshold: 1.000, hinge: 0.500

Feature types used: hinge product linear threshold quadratic

responsecurves: true

jackknife: true

maximumiterations: 2000

'Fixed Cumulative Value of 1%', 'Equal Training Sensitivity and Specificity' and 'Equate Entropy of Thresholded and Original Distributions' thresholds and omission rates:


1.000-24.171-5.892-Cumulative threshold

0.025-0.413-0.165-Logistic threshold

0.564-0.196-0.368-Fractional predicted area

0.001-0.196-0.027-Training omission rate