Predicting productivity in tropical reservoirs: The roles of phytoplankton taxonomic and functional diversity

被引:16
作者
Santos, Ana M. C. [1 ,2 ,3 ,4 ]
Carneiro, Fernanda M. [5 ]
Cianciaruso, Marcus V. [4 ]
机构
[1] Univ Lisbon, Fac Ciencias, Ctr Biol Ambiental, P-1749016 Lisbon, Portugal
[2] Univ Lisbon, Fac Ciencias, Ctr Ecol Evolut & Environm Changes Ce3C, P-1749016 Lisbon, Portugal
[3] Museo Nacl Ciencias Nat CSIC, Dept Biogeog & Global Change, Madrid 28006, Spain
[4] Univ Fed Goias, Dept Ecol, Inst Ciencias Biol, BR-74001970 Goiania, Go, Brazil
[5] UEG, Unidade Univ Ipora UnU Ipora, Nucl Educ Ambiental & Pesquisa Biol NEAP Bio, BR-76200000 Ipora, Go, Brazil
关键词
Biodiversity; Chlorophyll-a; Ecosystem functioning; Functional groups; Linear mixed models; Species richness; SPECIES RICHNESS; BIODIVERSITY; COMMUNITY; CLASSIFICATION; PATTERNS; LAKES; BIOMASS; EUTROPHICATION; ECOSYSTEMS; FRAMEWORK;
D O I
10.1016/j.ecolind.2014.08.033
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Primary productivity is intimately linked with biodiversity and ecosystem functioning. Much of what is known today about such relationship has been based on the manipulation of species richness. Other facets of biodiversity, such as functional diversity, have been neglected within this framework, particularly in freshwater systems. We assess the adequacy of different diversity measures, from species richness and evenness, to functional groups richness and functional diversity indices, to predict primary productivity in 19 tropical reservoirs of central Brazil, built to generate hydroelectric energy. We applied linear mixed models (and model selection based on the Akaike's information criterion) to achieve our goal, using chlorophyll-a concentration as a surrogate for primary productivity. A total of 412 species were collected in this study. Overall we found a positive relation between productivity and diversity, with functional evenness representing the only exception. The most parsimonious models never included functional group classifications, with at least one continuous measure of functional diversity being present in many models. The best model included only species richness and explained 24.1% of variability in productivity. We therefore advise the use of species richness as an indicator of productivity in tropical freshwater environments. However, since the productivity-diversity relationship is known to be scale dependent, we recommend the use of continuous measures of functional diversity in future biodiversity and ecosystem functioning studies, in order to be certain that all functional differences between communities are being accounted for. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:428 / 435
页数:8
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