The data correspond to a project to assess ecological differentiation of Vachellia caven across a major part of its continental distribution. Sampling events were made between winter 2019 and summer 2020 (southern hemisphere), across Chile, Argentina and Paraguay. The records correspond to observations of individuals of Vachellia caven of at least 3 meters tall, identified in the field or lab. Several data include "variety" as taxonomic level, used for the previous taxonomic name (Acacia caven). Data correspond to sampling events: a) for morphological studies (with vouchers in IBONE and GEL/UCHIL) assessing vegetative and reproductive traits, b) facilitation studies, in populations with at least 10 trees and crown radius higher than 1,5 m. c) niche studies, were identification was at field without physical sampling.
The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 860 records.
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Researchers should cite this work as follows:
Velasco N, Soto C (2020): Vachellia caven in Southern South America. v1.3. Laboratorio de Ecología Geográfica - Universidad de Chile. Dataset/Occurrence. http://gbif-chile.mma.gob.cl/ipt/resource?r=vachellia_caven&v=1.3
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The publisher and rights holder of this work is Laboratorio de Ecología Geográfica - Universidad de Chile. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
This resource has been registered with GBIF, and assigned the following GBIF UUID: 703f7531-fd90-4b02-9303-c80c472f4a0a. Laboratorio de Ecología Geográfica - Universidad de Chile publishes this resource, and is itself registered in GBIF as a data publisher endorsed by GBIF Chile.
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A major portion of the distribution of Vachellia caven in South America
|Bounding Coordinates||South West [-37.719, -74.707], North East [-19.808, -52.031]|
|Start Date / End Date||2019-06-01 / 2020-03-24|
Disjunct distributions are patterns where populations of a species not distribute continuously in geography and are separated by a barrier. One typical and expected result of this discontinuity is that separate populations differentiate after time. These distributions form excellent biogeographic scenarios for studying ecological differentiation between populations. For instance, differentiation in morphological traits can represent an adaptation to new environments, while niche differentiation can be a consequence of access to areas previously restricted by dispersal limitation or competition. These kinds of changes are realised only after a long timespan since the disjunction and are primarily ecologically derived, while genetic differentiation is primarily the result of genetic drift produced shortly after the disruption. On the other hand, currently studies on ecological differentiation in disjunct populations have mostly focussed on attributes of the species, while differentiation in the ecological functioning of species has rarely been considered. Also, while it is known that the ecological function of a species may change depending on the local context (abiotic or biotic), so far no studies have evaluated how the ecological function of a species may change between regions along the entire (disjunct) distribution of a species. In this project, the focus will be on disjunct distributions and whether differentiation in ecological traits as morphology and niche relates to variation in the effects produced by populations in different regions. More specifically, we will evaluate the ecological differentiation (morphological, niche and function) of Acacia caven var. caven, a plant species with a disjunct distribution in the Southern Andes, with populations occurring in both Chile and Argentina on both sides of the mountain range.
|Title||Ecological and functional differentiation in a plant species with disjunct distribution: morphology, niche, and ecological function of Acacia caven var. caven at west and east of the Andes|
|Funding||Beca de Doctorado Nacional 2017 - CONICYT Beca de movilidad de Posgrado - Red de Macro Universidades de América Latina y el Caribe|
|Study Area Description||Distribution of Vachellia caven in South America, across Chile, Argentina and Paraguay. These include subtropical and Mediterranean climate, with xeric and temperate plant communities|
The personnel involved in the project:
-For morphological studies, photos and physical samples were taken from 5 trees. These include 4 shoots (30 cm each) and 20 fruits with peduncle, per trees. Varieties were identified in lab and field, and vouchers were deposited in IBONE herbarium, and GEL. -For facilitation, trees were only georeferenced if they were higher than 3 m, and 2 m radius on the crown. Tress were distant at least 15 m between them in each population. -For niche study, the variety was recorded in field and the georeferences of the individual was taken.
|Study Extent||Sampling across Chile, Argentina and Paraguay. The sampling was divided in two month for Chile and 3 months for covering Argentina and Paraguay.|
Method step description:
- For the morphological study were checked the descriptions provided in: Aronson, J. (1992). Evolutionary biology of Acacia caven (Leguminosae, Mimosoideae): infraspecific variation in fruit and seed characters. Annals of the Missouri Botanical Garden, 958-968. Pometti, C. L., Cialdella, A. M., Vilardi, J. C., & Saidman, B. O. (2007). Morphometric analysis of varieties of Acacia caven:(Leguminosae, Mimosoideae): Taxonomic inferences in the context of other Argentinean species. Plant Systematics and Evolution, 264(3-4), 239-249.