Small range size and narrow niche breadth predict range contractions in South African frogs

2012 ◽  
Vol 22 (5) ◽  
pp. 567-576 ◽  
Author(s):  
Emily A. Botts ◽  
Barend F. N. Erasmus ◽  
Graham J. Alexander
Keyword(s):  
South African ◽  
Niche Breadth ◽  
Range Size ◽  
Small Range

scholarly journals Biological and extrinsic correlates of extinction risk in Chinese lizards

2021 ◽  
Author(s):  
Yuxi Zhong ◽  
Chuanwu Chen ◽  
Yanping Wang
Keyword(s):  
Body Size ◽  
Extinction Risk ◽  
Species Traits ◽  
Geographic Range ◽  
Range Size ◽  
Habitat Specialization ◽  
Mean Annual Precipitation ◽  
Mean Annual Temperature ◽  
Small Range ◽  
Extrinsic Factors

Abstract China is a country with one of the most species rich reptile faunas in the world. However, nearly a quarter of Chinese lizard species assessed by the China Biodiversity Red List are threatened. Nevertheless, to date, no study has explicitly examined the pattern and processes of extinction and threat in Chinese lizards. In this study, we conducted the first comparative phylogenetic analysis of extinction risk in Chinese lizards. We addressed the following three questions: 1) What is the pattern of extinction and threat in Chinese lizards? 2) Which species traits and extrinsic factors are related to their extinction risk? 3) How can we protect Chinese lizards based on our results? We collected data on ten species traits (body size, clutch size, geographic range size, activity time, reproductive mode, habitat specialization, habitat use, leg development, maximum elevation, and elevation range) and seven extrinsic factors (mean annual precipitation, mean annual temperature, mean annual solar insolation, normalized difference vegetation index (NDVI), human footprint, human population density, and human exploitation). After phylogenetic correction, these variables were used separately and in combination to assess their associations with extinction risk. We found that Chinese lizards with small geographic range, large body size, high habitat specialization, and living in high precipitation areas were vulnerable to extinction. Conservation priority should thus be given to species with the above extinction-prone traits so as to effectively protect Chinese lizards. Preventing future habitat destruction should also be a primary focus of management efforts because species with small range size and high habitat specialization are particularly vulnerable to habitat loss.

The relationships between abundance, range size and niche breadth in Central European tree species

2009 ◽  
Vol 36 (5) ◽  
pp. 854-864 ◽  
Author(s):  
Benjamin Köckemann ◽  
Holger Buschmann ◽  
Christoph Leuschner
Keyword(s):  
Tree Species ◽  
Niche Breadth ◽  
Range Size ◽  
Central European

scholarly journals Trophic interactions among sympatric zooplanktivorous fish species in volume change conditions in a large, shallow, tropical lake

2011 ◽  
Vol 9 (1) ◽  
pp. 169-176 ◽  
Author(s):  
Rodrigo Moncayo-Estrada ◽  
Owen T Lind ◽  
Carlos Escalera-Gallardo
Keyword(s):  
Niche Breadth ◽  
Temporal Distribution ◽  
Niche Overlap ◽  
Species Interaction ◽  
Trophic Relationships ◽  
Water Volume ◽  
Species Flock ◽  
Small Range ◽  
Mean Values ◽  
Significant Difference

Significant reductions in the water volume of shallow lakes impose a restriction on species segregation promoting more interactions in the trophic relationships. The diets of three closely related zooplanktivorous silversides belonging to the Atherinopsidae species flock of lake Chapala , Mexico, were analyzed at two sites (Chirostoma jordani, C. labarcae, and C. consocium). Diets were described in critical shallow (August 2000) and volume recovery conditions (August 2005). Diets included mainly cladocerans (Bosmina, Ceriodaphnia, and Daphnia) and copepods (Cyclops). A significant difference in diets was detected when comparing years (MRPP analysis, A = 0.22, p < 0.0001) and sites at different years (MRPP analysis, A = 0.17, p = 0.004). According to niche breadth mean values, species were classified as specialized and intermediate feeders. In shallow conditions, the small range of niche breadth (1.72 to 3.64) and high diet overlap values (D = 0.64, L = 8.62) indicated a high potential for interspecific exploitative interaction. When the lake volume recovered, an increase in the niche breadth range (1.04 to 4.96) and low niche overlap values (D = 0.53, L = 2.32) indicated a reduction of the species interaction. The Mann-Whitney U-test supported this pattern by showing a significant difference between years for niche overlap (p = 0.006). The increased interaction during the low volume suggests alternative segregation in life-history variations and other niche dimensions such as spatial or temporal distribution.

scholarly journals Microhabitat analyses support relationships between niche breadth and range size when spatial autocorrelation is strong

Ecography ◽  
2020 ◽  
Vol 43 (5) ◽  
pp. 724-734 ◽  
Author(s):  
Gentile Francesco Ficetola ◽  
Enrico Lunghi ◽  
Raoul Manenti
Keyword(s):  
Spatial Autocorrelation ◽  
Niche Breadth ◽  
Range Size ◽  
Support Relationships

scholarly journals Spatial autocorrelation inflates niche breadth-range size relationships

2018 ◽  
Vol 27 (12) ◽  
pp. 1426-1436 ◽  
Author(s):  
Timothy E. Moore ◽  
Robert Bagchi ◽  
Matthew E. Aiello-Lammens ◽  
Carl D. Schlichting
Keyword(s):  
Spatial Autocorrelation ◽  
Niche Breadth ◽  
Range Size

scholarly journals Range size, dispersal and niche breadth in the herbaceous flora of central England

1999 ◽  
Vol 87 (1) ◽  
pp. 150-155 ◽  
Author(s):  
Ken Thompson ◽  
Kevin J. Gaston ◽  
Stuart R. Band
Keyword(s):  
Niche Breadth ◽  
Range Size
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