Individual foraging specialization: niche width versus niche overlap

Oikos ◽  
2007 ◽  
Vol 116 (9) ◽  
pp. 1431-1437 ◽  
Author(s):  
Brooke L. Sargeant
1987 ◽  
Vol 65 (9) ◽  
pp. 1824-1837 ◽  
Author(s):  
Janice M. Glime ◽  
Dale H. Vitt

Eleven alkaline western Canadian montane streams were sampled by transects to compare the bryophyte species cover, diversity, frequency, richness, niche width, and niche overlap in three vertical zones (relative to water level) with the same parameters in four acidic streams on Slide Mountain in the Adirondack Mountains of New York. Resources for niche width and overlap include vertical distance from water surface, aspect in stream, substrate size, and percent bare substrate. Species cover, richness, and diversity increase from the submerged zone 1 (< −5 cm) to the terrestrial zone 3 (10–30 cm). Brillouin species diversity increases from 1.98 to 3.03 (means per stream) along the same gradient. All species except one from zone 1 also occur in zone 3. The niche widths for aspect in stream, substrate size, and vertical distance from water surface are all negatively correlated with their chi-square values, indicating that the width values are most reliable for small widths and become increasingly less reliable for large niche widths. Niche overlap is high among most species for at least one resource parameter.


2021 ◽  
Vol 248 ◽  
pp. 02023
Author(s):  
LI Yanxia ◽  
Jie Zhang

From the perspective of ecological niche, this paper constructs the evaluation index system of the competitiveness of beijing-tianjin-hebei high-tech industry, and analyzes the competitiveness of beijing-tianjin-hebei high-tech industry from the perspectives of niche value, niche width and niche overlap. The results show that :(1) from the perspective of ecological niche, the niche value of the competitiveness of high-tech industries in Beijing, tianjin and hebei does not show an increasing trend with time, and the overall value of the niche is ranked from the largest to the smallest: Beijing, tianjin and hebei.(2) from the niche breadth, beijing-tianjin-hebei high-tech industry competitiveness niche breadth range as follows: 0.26-0.83, Beijing niche width of the widest, hebei niche breadth the narrowest, Beijing and tianjin hi-tech industry competitiveness niche breadth value reduced trend on the whole, hebei niche breadth on overall growth trend.


Ecology ◽  
1972 ◽  
Vol 53 (4) ◽  
pp. 687-692 ◽  
Author(s):  
E. C. Pielou
Keyword(s):  

2021 ◽  
Author(s):  
Devin L. Johnson ◽  
Michael T. Henderson ◽  
David L. Anderson ◽  
Travis L. Booms ◽  
Cory T. Williams

Abstract Intra- and inter-specific resource partitioning within predator communities is a fundamental component of trophic ecology, and one proposed mechanism for how populations partition resources is through individual niche variation. The Niche Variation Hypothesis (NVH) predicts that interindividual trait variation leads to functional trade-offs in foraging efficiency, resulting in populations comprised of individual dietary specialists. A modified version of the NVH [mNVH] predicts niche specialization is plastic and responsive to fluctuating resource availability. We quantified niche overlap and tested the mNVH within an Arctic raptor guild, focusing on three species that employ different foraging strategies: Golden Eagles (generalists); Gyrfalcons (facultative specialists); and Rough-legged Hawks (specialists). Tundra ecosystems exhibit cyclic populations of arvicoline rodents (lemmings and voles), providing a unique system under which to examine interannual fluctuations in predator resource availability. Using blood δ13C & δ15N values from 189 raptor nestlings on Alaska’s Seward Peninsula (2014–2019), we calculated isotopic niche width and used Bayesian stable isotope mixing models (BSIMMs) to characterize individual specialization and test the mNVH. We observed a high degree of isotopic niche overlap between the three species and variable trophic responses to different stages of the arvicoline rodent cycle. Elevated arvicoline rodent abundance corresponded to reduced niche overlap among species and increased individual specialization in Golden Eagles and Gyrfalcons. Further, Gyrfalcons displayed a positive relationship between individual specialization and population niche width on an interannual basis consistent with the mNVH. Our findings suggest plasticity in niche specialization may reduce intra- and inter-specific resource competition under dynamic ecological conditions.


Author(s):  
Catherine E. Sheppard ◽  
Rachel Heaphy ◽  
Michael A. Cant ◽  
Harry H. Marshall

Oecologia ◽  
1997 ◽  
Vol 110 (4) ◽  
pp. 592-600 ◽  
Author(s):  
D. E. Schindler ◽  
James R. Hodgson ◽  
James F. Kitchell

Oecologia ◽  
2015 ◽  
Vol 178 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Adam E. Rosenblatt ◽  
James C. Nifong ◽  
Michael R. Heithaus ◽  
Frank J. Mazzotti ◽  
Michael S. Cherkiss ◽  
...  

2019 ◽  
Vol 166 (3) ◽  
Author(s):  
Renan C. de Lima ◽  
Valentina Franco-Trecu ◽  
Damián G. Vales ◽  
Pablo Inchausti ◽  
Eduardo R. Secchi ◽  
...  

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