Planktonic equatorial diversity troughs: fact or artifact? Latitudinal diversity gradients in Radiolaria

Ecology ◽  
2016 ◽  
Vol 98 (1) ◽  
pp. 112-124 ◽  
Author(s):  
Demetrio Boltovskoy ◽  
Nancy Correa
Keyword(s):  
Diversity Gradients

Drivers of diversity gradients of a highly mobile marine assemblage in a mesoscale seascape

2020 ◽  
Vol 638 ◽  
pp. 149-164
Author(s):  
GM Svendsen ◽  
M Ocampo Reinaldo ◽  
MA Romero ◽  
G Williams ◽  
A Magurran ◽  
...  
Keyword(s):  
Environmental Gradients ◽  
Regression Tree ◽  
Demersal Fish ◽  
Open Ocean ◽  
Shared Resources ◽  
Thermal Front ◽  
Boosted Regression Tree ◽  
Diversity Gradients ◽  
Α Diversity ◽  
Bottom Depth

With the unprecedented rate of biodiversity change in the world today, understanding how diversity gradients are maintained at mesoscales is a key challenge. Drawing on information provided by 3 comprehensive fishery surveys (conducted in different years but in the same season and with the same sampling design), we used boosted regression tree (BRT) models in order to relate spatial patterns of α-diversity in a demersal fish assemblage to environmental variables in the San Matias Gulf (Patagonia, Argentina). We found that, over a 4 yr period, persistent diversity gradients of species richness and probability of an interspecific encounter (PIE) were shaped by 3 main environmental gradients: bottom depth, connectivity with the open ocean, and proximity to a thermal front. The 2 main patterns we observed were: a monotonic increase in PIE with proximity to fronts, which had a stronger effect at greater depths; and an increase in PIE when closer to the open ocean (a ‘bay effect’ pattern). The originality of this work resides on the identification of high-resolution gradients in local, demersal assemblages driven by static and dynamic environmental gradients in a mesoscale seascape. The maintenance of environmental gradients, specifically those associated with shared resources and connectivity with an open system, may be key to understanding community stability.

Subsampling Herbarium Collections to Assess Geographic Diversity Gradients: A Case Study with Endemic Orchidaceae and Rubiaceae in Cameroon

Biotropica ◽  
2011 ◽  
Vol 44 (1) ◽  
pp. 44-52 ◽  
Author(s):  
Vincent Droissart ◽  
Olivier J. Hardy ◽  
Bonaventure Sonké ◽  
Farid Dahdouh-Guebas ◽  
Tariq Stévart
Keyword(s):  
Diversity Gradients ◽  
Geographic Diversity ◽  
Herbarium Collections

scholarly journals Latitudinal Diversity Gradients in New World Bats: Are They a Consequence of Niche Conservatism?

PLoS ONE ◽  
2013 ◽  
Vol 8 (7) ◽  
pp. e69245 ◽  
Author(s):  
Maria João Ramos Pereira ◽  
Jorge M. Palmeirim
Keyword(s):  
New World ◽  
Niche Conservatism ◽  
Diversity Gradients

scholarly journals The pitfalls of biodiversity proxies: Differences in richness patterns of birds, trees and understudied diversity across Amazonia

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Camila D. Ritter ◽  
Søren Faurby ◽  
Dominic J. Bennett ◽  
Luciano N. Naka ◽  
Hans ter Steege ◽  
...  
Keyword(s):  
Species Richness ◽  
Large Scale ◽  
Spatial Scales ◽  
Local Environment ◽  
Life Forms ◽  
Taxonomic Group ◽  
Diversity Gradients ◽  
Richness Patterns ◽  
Taxonomic Groups ◽  
Micro Organisms

AbstractMost knowledge on biodiversity derives from the study of charismatic macro-organisms, such as birds and trees. However, the diversity of micro-organisms constitutes the majority of all life forms on Earth. Here, we ask if the patterns of richness inferred for macro-organisms are similar for micro-organisms. For this, we barcoded samples of soil, litter and insects from four localities on a west-to-east transect across Amazonia. We quantified richness as Operational Taxonomic Units (OTUs) in those samples using three molecular markers. We then compared OTU richness with species richness of two relatively well-studied organism groups in Amazonia: trees and birds. We find that OTU richness shows a declining west-to-east diversity gradient that is in agreement with the species richness patterns documented here and previously for birds and trees. These results suggest that most taxonomic groups respond to the same overall diversity gradients at large spatial scales. However, our results show a different pattern of richness in relation to habitat types, suggesting that the idiosyncrasies of each taxonomic group and peculiarities of the local environment frequently override large-scale diversity gradients. Our findings caution against using the diversity distribution of one taxonomic group as an indication of patterns of richness across all groups.

Spatial Grain and the Causes of Regional Diversity Gradients in Ants

2003 ◽  
Vol 161 (3) ◽  
pp. 459-477 ◽  
Author(s):  
Michael Kaspari ◽  
May Yuan ◽  
Leeanne Alonso
Keyword(s):  
Regional Diversity ◽  
Diversity Gradients ◽  
Spatial Grain

Latitudinal‐diversity gradients can be shaped by biotic processes: new insights from an eco‐evolutionary model

Ecography ◽  
2018 ◽  
Vol 42 (2) ◽  
pp. 259-271 ◽  
Author(s):  
Renato Henriques‐Silva ◽  
Alexander Kubisch ◽  
Pedro R. Peres‐Neto
Keyword(s):  
Evolutionary Model ◽  
Diversity Gradients

scholarly journals Quantifying Phylogenetic Beta Diversity: Distinguishing between ‘True’ Turnover of Lineages and Phylogenetic Diversity Gradients

PLoS ONE ◽  
2012 ◽  
Vol 7 (8) ◽  
pp. e42760 ◽  
Author(s):  
Fabien Leprieur ◽  
Camille Albouy ◽  
Julien De Bortoli ◽  
Peter F. Cowman ◽  
David R. Bellwood ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Phylogenetic Diversity ◽  
Diversity Gradients
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