INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
The importance of biogeographical history and extant environmental conditions as drivers of freshwater decapod distribution in southern South America.
Autor/es:
GIRI F.; TUMINI G.; COLLINS P.; WILLINER V.
Revista:
FRESHWATER BIOLOGY (PRINT)
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2016 vol. 61 p. 715 - 728
ISSN:
0046-5070
Resumen:
1. A topical issue in macroecology is whether the distribution of organisms is related tobiogeographical history or current environmental conditions. Distributions of freshwater decapods insouthern South America have been mainly attributed to historical factors, such as geoclimatic events,marine ingressions, tectonic uplifts and glaciations. Here, we test the hypothesis that currentdistributions are strongly influenced by local environmental conditions.2. Generalised linear models were used to quantify the importance of altitude, stability of thewaterbody, annual temperature range (ATR), pH and conductivity on the distribution of fivefreshwater decapod families in Argentina (Sergestidae, Palaemonidae, Parastacidae, Aeglidae andTrichodactylidae), while accounting for effects of latitude and longitude.3. Decapod occurrence was strongly associated with interacting spatial and environmental factors.Latitudinal and/or longitudinal gradients were important predictors for the occurrence of Acetesparaguayensis (Sergestidae), Palaemonidae, Aeglidae and Trichodactylidae. However, the longitudinalpattern for Palaemonidae was reversed, increasing from east to west, when environmental variableswere included in the analyses, whereas for Trichodactylidae, the longitudinal pattern was sufficientlyexplained by inclusion of local environmental variables.4. Altitude, water stability and ATR were important predictors of all families, while Palaemonidae,Parastacidae and Trichodactylidae were significantly associated with pH and Palaemonidae andAeglidae with conductivity. Interactions terms were often significant, especially with latitude.5. Our results show that the macrodistribution of freshwater decapods is not solely a result ofhistorical processes, a finding that disagrees with current understandings. Significant relationshipsbetween decapod occurrence and environmental variables indicates limited plasticity and strongadaptation to local habitats, highlighting the importance of including environmental factors instudies of crustacean biogeography and macroecology.