Species diversity of freshwater decapod crustaceans (crabs and shrimps) from Colombia

in Crustaceana
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The aim of this paper is to characterize the species diversity of freshwater decapod crustaceans (crabs and shrimps) from Colombia by using a dataset containing 964 digitized records and 13 881 specimens collected between 1910 and 2016, information that has been assembled with data from 21 museums and other institutions worldwide. The characterization of species diversity is based on the estimation of relative abundance of species and it is calculated in three separate analyses in which the data were partitioned as follows: (a) by decapod families (six in Colombia) (b) the unpartitioned dataset of all 139 Colombian species and (c) by the five biogeographic regions in the country. In each case, Campos & Isaza’s species diversity index and the Shannon entropy index were calculated. The calculations performed here also allowed the identification of predominant species and those that are least represented in collections and might therefore be at greater risk of extinction.

Species diversity of freshwater decapod crustaceans (crabs and shrimps) from Colombia

in Crustaceana

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References

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Figures

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    Behaviour of α(S) as function of the species richness, S.

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    Number of specimens recorded decennially between 1910 and 2016 of Colombian freshwater decapod crustaceans for the different collection databases (see text for list of the collections).

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    Relative weights for each family: PS, Pseudothelphusidae; TR, Trichodactylidae; AT, Atyidae; PA, Palaemonidae; EU, Euryrhynchidae; SE, Sergestidae. The sum of weights associated with the 139 species is normalized to one.

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    Relative weights of the 139 species included in the decapod crustaceans collection database, with the set normalized to one. The symbol ×2 indicates that the weight of Macrobrachium brasiliense (Heller, 1862) is twice the value indicated in the graph, i.e., it is 0.14523.

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    Relative weights of the species of freshwater decapod crustaceans for each natural region of Colombia: AN, Andean region; CA, Caribbean region; AM, Amazonian region; OR, Orinoquian region; PAC, Pacific region.

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    Species diversity index (B1(S,r)) as function of radius r, calculated according to a partition in terms of families. The weighted mean value of the diversity index is represented by the big black point, and the rectangle is constructed with the uncertainties of the radii and the diversity indices. PS, Pseudothelphusidae; TR, Trichodactylidae; AT, Atyidae; PA, Palaemonidae; EU, Euryrhynchidae; SE, Sergestidae.

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    Biodiversity index (B1(S,r)) as function of radius r, calculated by using a partition of specimens in terms of the natural regions from Colombia. The black point represents the mean value calculated with the weighted contributions of the regions, and the rectangle is constructed with the uncertainties of the radii and the diversity indices of the regions. AN, Andean region; CA, Caribbean region; AM, Amazonian region; OR, Orinoquian region; PAC, Pacific region; COL, Colombia.

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    Comparison of mean radii and diversity indices when the collected specimens are partitioned into freshwater decapod Crustaceans families or in terms of the natural regions of Colombia. The uncertainty rectangles are also shown.

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