Subtropical streams harbour higher genus richness and lower abundance of insects compared to boreal streams, but scale matters

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Heino , J , Melo , A S , Jyrkänkallio-Mikkola , J , Petsch , D K , Saito , V S , Tolonen , K T , Bini , L M , Landeiro , V L , Freire Silva , T S , Pajunen , V , Soininen , J & Siqueira , T 2018 , ' Subtropical streams harbour higher genus richness and lower abundance of insects compared to boreal streams, but scale matters ' , Journal of Biogeography , vol. 45 , no. 9 , pp. 1983-1993 . https://doi.org/10.1111/jbi.13400

Title: Subtropical streams harbour higher genus richness and lower abundance of insects compared to boreal streams, but scale matters
Author: Heino, Jani; Melo, Adriano S.; Jyrkänkallio-Mikkola, Jenny; Petsch, Danielle Katharine; Saito, Victor Satoru; Tolonen, Kimmo T.; Bini, Luis Mauricio; Landeiro, Victor Lemes; Freire Silva, Thiago Sanna; Pajunen, Virpi; Soininen, Janne; Siqueira, Tadeu
Other contributor: University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
University of Helsinki, Department of Geosciences and Geography
Date: 2018-09
Language: eng
Number of pages: 11
Belongs to series: Journal of Biogeography
ISSN: 0305-0270
DOI: https://doi.org/10.1111/jbi.13400
URI: http://hdl.handle.net/10138/327281
Abstract: Aim: Biological diversity typically varies between climatically different regions, and regions closer to the equator often support higher numbers of taxa than those closer to the poles. However, these trends have been assessed for a few organism groups, and the existing studies have rarely been based on extensive identical surveys in different climatic regions. Location: We conducted standardized surveys of wadeable streams in a boreal (western Finland) and a subtropical (south-eastern Brazil) region, sampling insects identically from 100 streams in each region and measuring the same environmental variables in both regions. Taxon: Aquatic insects. Methods: Comparisons were made at the scales of local stream sites, drainage basins and entire regions. We standardized the spatial extent of the study areas by resampling regional richness based on subsets of sites with similar extents. We examined differences in genus richness and assemblage abundance patterns between the regions using graphical and statistical modelling approaches. Results: We found that while genus accumulation and rank-abundance curves were relatively similar at the regional scale between Finland and Brazil, regional genus richness was higher in the latter but regional abundance much higher in the former region. These regional patterns for richness and abundance were reproduced by basin and local genus richness that were higher in Brazil than in Finland, and assemblage abundance that was much higher in Finland than in Brazil. The magnitude of the difference in genus richness between Brazil and Finland tended to increase from local through basin to regional scales. Main conclusions: Our findings suggest that factors related to evolutionary diversification might explain differences in genus richness between these two climatically different regions, whereas higher nutrient concentrations of stream waters might explain the higher abundance of insects in Finland than in Brazil.
Subject: alpha diversity
latitudinal diversity gradient
low-high latitude comparison
nutrients
rank abundance
regional diversity
stream insects
LATITUDINAL DIVERSITY GRADIENT
SPECIES RICHNESS
MACROINVERTEBRATE COMMUNITIES
ENVIRONMENTAL-CONDITIONS
BEETLES COLEOPTERA
GLOBAL PATTERNS
BETA DIVERSITY
BIODIVERSITY
ORGANISMS
EVOLUTION
1172 Environmental sciences
1181 Ecology, evolutionary biology
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