Revista Chilena de Historia Natural 86 (1): 75-94, 2013
RESEARCH ARTICLE
The Chacoan bat fauna identity: Patterns of distributional congruence and
conservation implications
The aim of this paper is to characterize the Chaco thorn-scrub savanna as a
unit, biologically defined by means of its identification as a regional pattern of distributional congruence, through the
evaluation of the utility of bat assemblages as biogeographical indicators of the Chaco at regional scale, and to then
evaluate this characterization in terms of the conservation value of this habitat. We have considered the whole territory of
Paraguay and Bolivia, and the northern of Argentina; that is the entire Chaco biogeographical province, and part of the
surrounding biogeographical provinces. We conducted an exhaustive search and constructed a database consisting in 9509
geo-referenced records showing that the bat fauna of the Chaco is richer than previously reported. We used an optimality
criterion to identify patterns of distributional congruence determined by the distribution of bats. We recovered several areas
that correspond with the Chaco. The areas that are coincident with the Chaco were supported by eight species:
Eptesicus brasiliensis, E. diminutus, Eumops dabbenei, Histiotus velatus,
Promops centralis, P. nasutus, Pygoderma bilabiatum, and Tonatia
bidens. These results show that bat assemblages are useful as characterizing of regional patterns of distributional
congruence. These patterns provide first-step testable hypotheses of areas of endemism for future analyses of neighboring
regions or analyses at more inclusive scales. Bat assemblages may be used to characterize the Chaco despite the fact that
it was thought this habitat lacked an identity in relation to its bat fauna. The Chacoan nature as a biologically distinctive
natural unit is clear now also in terms of regional patterns of distributional congruence of bat species, which provides further
evidence for intensifying efforts to protect this endangered habitat.
Key words:
Chaco,
Chiroptera, optimality criterion, patterns of distributional congruence, South America.
