scholarly journals Isotopic niche variation in Tasmanian devils Sarcophilus harrisii with progression of devil facial tumor disease

2021 ◽  
Author(s):  
Olivia Bell ◽  
Menna E. Jones ◽  
Calum X. Cunningham ◽  
Manuel Ruiz‐Aravena ◽  
David G. Hamilton ◽  
...  
Keyword(s):  
Isotopic Niche ◽  
Niche Variation ◽  
Devil Facial Tumor Disease ◽  
Sarcophilus Harrisii

Intraspecific isotopic niche variation in broad-snouted caiman (Caiman latirostris)

2013 ◽  
Vol 49 (3) ◽  
pp. 325-335 ◽  
Author(s):  
Thiago S. Marques ◽  
Neliton R.F. Lara ◽  
Luis A.B. Bassetti ◽  
Carlos I. Piña ◽  
Plínio B. Camargo ◽  
...  
Keyword(s):  
Isotopic Niche ◽  
Niche Variation

Doxorubicin and carboplatin trials in Tasmanian devils (Sarcophilus harrisii) with Tasmanian devil facial tumor disease

2015 ◽  
Vol 206 (3) ◽  
pp. 312-316 ◽  
Author(s):  
David N. Phalen ◽  
Angela E. Frimberger ◽  
Sarah Peck ◽  
Stephen Pyecroft ◽  
Colette Harmsen ◽  
...  
Keyword(s):  
Tasmanian Devil ◽  
Devil Facial Tumor Disease ◽  
Sarcophilus Harrisii

scholarly journals The Immunohistochemical Characterization of Devil Facial Tumor Disease (DFTD) in the Tasmanian Devil (Sarcophilus harrisii)

2006 ◽  
Vol 43 (6) ◽  
pp. 896-903 ◽  
Author(s):  
R. Loh ◽  
D. Hayes ◽  
A. Mahjoor ◽  
A. O'Hara ◽  
S. Pyecroft ◽  
...  
Keyword(s):  
Tasmanian Devil ◽  
Devil Facial Tumor Disease ◽  
Sarcophilus Harrisii

scholarly journals Trophic Niche Dynamics and Diet Partitioning of King Crab Lithodes santolla in Chile’s Sub-Antarctic Water

Diversity ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 56
Author(s):  
Claudia Andrade ◽  
Cristóbal Rivera ◽  
Erik Daza ◽  
Eduardo Almonacid ◽  
Fernanda Ovando ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Trophic Position ◽  
Trophic Relationships ◽  
Diet Shift ◽  
Isotopic Niche ◽  
King Crab ◽  
Stable Isotope Analyses ◽  
Niche Variation ◽  
Isotope Analyses ◽  
Cape Horn

The southern king crab Lithodes santolla is one of the most economically important fishery species in the southern waters of the Atlantic and Pacific Oceans. A combination of stomach content and stable isotope analyses was used to reveal the potential dietary characteristics, isotopic niche, overlap among maturity stages and sexes, and trophic relationships of an L. santolla population in the Nassau Bay, Cape Horn region. Stable isotope analyses indicated that L. santolla assimilated energy from a basal carbon source, the giant kelp Macrocystis pyrifera, forming the trophic baseline of the benthic food web. Moreover, the trophic position of L. santolla varied among late juveniles and adults, suggesting that the southern king crab does undergo an ontogenetic diet shift. L. santolla exhibited intraspecific isotopic niche variation, reflecting niche differentiation which allows the species to partition resources. The trophic relationships of L. santolla with the associated fauna suggested some potential interactions for food resources/habitat use when they are limited. This study is the first attempt to characterize the trophic dynamics of the southern king crab in the Cape Horn area and, by generating more data, contributes to the conservation of the king crab population and the long-term management of local fisheries that rely on this resource.

scholarly journals Isotopic Niche Partitioning and Individual Specialization in an Arctic Raptor Guild

2021 ◽  
Author(s):  
Devin L. Johnson ◽  
Michael T. Henderson ◽  
David L. Anderson ◽  
Travis L. Booms ◽  
Cory T. Williams
Keyword(s):  
Resource Availability ◽  
Niche Overlap ◽  
Niche Width ◽  
Foraging Strategies ◽  
Foraging Efficiency ◽  
Isotopic Niche ◽  
Individual Specialization ◽  
Niche Specialization ◽  
Niche Variation ◽  
Golden Eagles

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.

scholarly journals Tracking niche variation over millennial timescales in sympatric killer whale lineages

2013 ◽  
Vol 280 (1768) ◽  
pp. 20131481 ◽  
Author(s):  
Andrew D. Foote ◽  
Jason Newton ◽  
María C. Ávila-Arcos ◽  
Marie-Louise Kampmann ◽  
Jose A. Samaniego ◽  
...  
Keyword(s):  
Individual Differences ◽  
Killer Whale ◽  
Early Stage ◽  
Sympatric Speciation ◽  
Clupea Harengus ◽  
Isotopic Niche ◽  
Isotopic Ratios ◽  
Lineage Sorting ◽  
Tissue Samples ◽  
Niche Variation

Niche variation owing to individual differences in ecology has been hypothesized to be an early stage of sympatric speciation. Yet to date, no study has tracked niche width over more than a few generations. In this study, we show the presence of isotopic niche variation over millennial timescales and investigate the evolutionary outcomes. Isotopic ratios were measured from tissue samples of sympatric killer whale Orcinus orca lineages from the North Sea, spanning over 10 000 years. Isotopic ratios spanned a range similar to the difference in isotopic values of two known prey items, herring Clupea harengus and harbour seal Phoca vitulina . Two proxies of the stage of speciation, lineage sorting of mitogenomes and genotypic clustering, were both weak to intermediate indicating that speciation has made little progress. Thus, our study confirms that even with the necessary ecological conditions, i.e. among-individual variation in ecology, it is difficult for sympatric speciation to progress in the face of gene flow. In contrast to some theoretical models, our empirical results suggest that sympatric speciation driven by among-individual differences in ecological niche is a slow process and may not reach completion. We argue that sympatric speciation is constrained in this system owing to the plastic nature of the behavioural traits under selection when hunting either mammals or fish.

The Pathology of Devil Facial Tumor Disease (DFTD) in Tasmanian Devils (Sarcophilus harrisii)

2006 ◽  
Vol 43 (6) ◽  
pp. 890-895 ◽  
Author(s):  
R. Loh ◽  
J. Bergfeld ◽  
D. Hayes ◽  
A. O'Hara ◽  
S. Pyecroft ◽  
...  
Keyword(s):  
Devil Facial Tumor Disease ◽  
Sarcophilus Harrisii

scholarly journals Isotopic Niche Variation in a Higher Trophic Level Ectotherm: Highlighting the Role of Succulent Plants in Desert Food Webs

PLoS ONE ◽  
2015 ◽  
Vol 10 (5) ◽  
pp. e0126814 ◽  
Author(s):  
Miguel Delibes ◽  
Ma Carmen Blazquez ◽  
Jose Maria Fedriani ◽  
Arsenio Granados ◽  
Laura Soriano ◽  
...  
Keyword(s):  
Food Webs ◽  
Trophic Level ◽  
Isotopic Niche ◽  
Niche Variation ◽  
Succulent Plants
Sign in / Sign up

Export Citation Format

Share Document