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Venezuela´s Eco Regions

 

Lara-Falcón dry forests 

The Lara/Falcon dry forests are part of the unique tropical fragmented xeric areas left
throughout northern Venezuela. Although of great biological importance, they have been
little studied.

Endemism is relatively low except for avifauna, which includes the species buffy hummingbird
(Leucippus fallax) and chesnut piculet (Picumnus cinnamomeus). Damaged by
agriculture and grazing only one national park, Cueva de la Quebrada del Toro National Park,
protects what is left of this ecoregion. 

Location and General Description 

The Lara/Falcon dry forests lie in northern Venezuela, south of the
Paraguana peninsula, east of the Gulf of Maracaibo and north of the Andes. The
ecoregion is located in the states of Lara and Falcón in the northwestern side of
Venezuela. This arid region lies between two xeric scrub habitats, and has as its northern and eastern limits as the Caribbean Sea. To the west it borders the Sierra de San Luis, and to the south the Sierra de
Aroa. The easternmost mountains and hills of the Sierra de Falcón fall within this
ecoregion; they constitute the Cueva de la Quebrada del Toro National Park. Major
rivers in the region are the Hueque, Tocuro and Aroa.

The mountains, valleys and lowlands range from 100 to 1,300 masl. As a result of the altitudinal
variation, the ecoregion consists of various microclimates that create a mosaic of vegetation in
the mountainous area. The precipitation in the area ranges from 300 to 1000 mm (Venezuela
2000). The median temperature is from 27 to 28 °C. 

Ultisols and oxisols, found widely in the states of Lara and Falcón, are soils of low fertility
(Huber and D. Frame. 1988), although the quality of the soils has not deterred agriculture in the
area.

This ecoregion has a mosaic pattern of climatic formations, such as dense drought deciduous
lowland woodland, submontane woodland, and evergreen seasonal lowland forest. The flora in
drought deciduous lowland and submontane woodland includes Acacia farnesiana,
Acanthocereus colombianus, Bombacopsis quinata, Bourreria cumanensis, Bulnesia arborea,
Caesalpinia coriaria, Capparis coccolobifolia, C. flexuosa, C. linearis, C. odoratissima, C.
tenuisiliqua, Cassia sp., Castela erecta, Cercidium praecox, Croton rhamnifolius, Eugenia
sp., Guapira sp., Hyptis sp., Ipomoea carnea, Jatropha gossypiifolia, Lemaireocereus griseus,
Libidibia coriaria, Lonchocarpus sp., Machaerium robiniaefolium, Morisonia americana,
Opuntia sp., Pereskia colombiana, P. guamacho, Piptadenia flava, Pithecellobium dulce, P.
unguis-cati, Platymiscium sp., Poponax tortuosa, Prosopis juliflora, Randia armata,
Ritterocereus griseus, Tabebuia bilbergi, Talisia olivaeformis, and Zanthoxylum sp. (Huber
and Clara Alarcon 1988), (UNESCO 1981).

The tropical evergreen seasonal lowland forest, in the southeastern area (UNESCO 1981), is
more characteristic of ecoregion 27- Cordillera La Costa Montane forests.

Biodiversity Features

Plant endemism in the area is restricted to one species, Apoplanesia cryptantha, in
the Fabaceae family. This endemic plant is located in deciduous woodlands in the
eastern area.

There is one only endemic mammal in the area, Marmosa xerophila. This endemic opossum is
found in this ecoregion and others in dry forests in northern Colombia and Venezuela. Marmosa
is very well adapted to dry habitats, and is mainly found in deciduous forest (Eisenberg 1989).

The high endemic number of birds in this and other ecoregions is restricted to arid lowlands.
The yellow-shouldered amazon (Amazona barbadensis) has a "vulnerable status", and the
Maracaibo tody-flycatcher (Todirotrum viridanum) has a "near threatened" status. The rest of
the endemic birds are under the status "least concern"; they include the pygmy swift
(Tachornis furcata), buffy hummingbird (Leucippus fallax), chesnut piculet (Picumnus
cinnamomeus), white-whiskered spinetail (Synallaxis candei), black-backed antshrike
(Sakesphorus melanonotus), slender-billd tyrannulet (Inezia tenuirostris), tocuyo sparrow
(Arremonops tocuyensis), and vermilion cardinal (Cardinalis phoeniceus) (Stattersfield et al.
1998).

Current Status 

The entire region has been severely affected by agriculture and livestock grazing. The
most altered areas are in the north and central parts of the ecoregion. 

The only protected habitat block is Cueva de la Quebrada del Toro National Park (IUCN
Category II). The Park has an extension of 8,500 ha. (UNEP), and contains one of the most
spectacular caverns of Venezuela (Gabaldon 1992).

Types and Severity of Threats 

Destruction of habitat by agriculture and grazing. 
Domestic pet trade threatens the yellow-shouldered amazon, despite the fact that the
law in Venezuela protects it. 
Natural disasters, such as drought, can affect the populations of the endemic birds in
the ecoregion.

Justification of Ecoregion Delineation

These are one of several dry forest regions of in the vicinity of the Maracaibo Basin
and Cordillera de Mérida. This ecoregion encompasses the Venezuelan states of
Lara and Falcón, and preliminary delineation’s follow Huber and Alarcón (1988).
Linework was subsequently reviewed and modified by Robert Smith (pers. comm),
who identified the region as unique based on species endemism and historic
coverage’s.       


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