Species-specific ontogenetic diet shifts among NeotropicalCrenicichla : using stable isotopes and tissue stoichiometry

2013 ◽  
Vol 82 (6) ◽  
pp. 1904-1915 ◽  
Author(s):  
E. D. Burress ◽  
A. Duarte ◽  
W. S. Serra ◽  
M. M. Gangloff ◽  
L. Siefferman
Keyword(s):  
Stable Isotopes ◽  
Ontogenetic Diet Shifts ◽  
Species Specific ◽  
Diet Shifts

Species‐specific ontogenetic diet shifts attenuate trophic cascades and lengthen food chains in exploited ecosystems

Oikos ◽  
2019 ◽  
Vol 128 (7) ◽  
pp. 1051-1064 ◽  
Author(s):  
Jonathan C. P. Reum ◽  
Julia L. Blanchard ◽  
Kirstin K. Holsman ◽  
Kerim Aydin ◽  
André E. Punt
Keyword(s):  
Trophic Cascades ◽  
Food Chains ◽  
Ontogenetic Diet Shifts ◽  
Species Specific ◽  
Diet Shifts

scholarly journals Stomach contents and stable isotopes confirm ontogenetic diet shifts of Nile perch, Lates niloticus, in southern Lake Victoria

2018 ◽  
Vol 44 (6) ◽  
pp. 1264-1272 ◽  
Author(s):  
I.J.M. Cornelissen ◽  
J. Vijverberg ◽  
A.M. van den Beld ◽  
N.R. Helmsing ◽  
J.A.J. Verreth ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Lake Victoria ◽  
Stomach Contents ◽  
Nile Perch ◽  
Ontogenetic Diet Shifts ◽  
Lates Niloticus ◽  
Diet Shifts

scholarly journals Variability in nitrogen-derived trophic levels of Arctic marine biota

Polar Biology ◽  
2020 ◽  
Author(s):  
Renske P. J. Hoondert ◽  
Nico W. van den Brink ◽  
Martine J. van den Heuvel-Greve ◽  
Ad M. J. Ragas ◽  
A. Jan Hendriks
Keyword(s):  
Stable Isotopes ◽  
Enrichment Factors ◽  
Trophic Levels ◽  
The Arctic ◽  
Marine Biota ◽  
Arctic Ecosystems ◽  
Arctic Species ◽  
Single Region ◽  
Benthic Food ◽  
Species Specific

AbstractStable isotopes are often used to provide an indication of the trophic level (TL) of species. TLs may be derived by using food-web-specific enrichment factors in combination with a representative baseline species. It is challenging to sample stable isotopes for all species, regions and seasons in Arctic ecosystems, e.g. because of practical constraints. Species-specific TLs derived from a single region may be used as a proxy for TLs for the Arctic as a whole. However, its suitability is hampered by incomplete knowledge on the variation in TLs. We quantified variation in TLs of Arctic species by collating data on stable isotopes across the Arctic, including corresponding fractionation factors and baseline species. These were used to generate TL distributions for species in both pelagic and benthic food webs for four Arctic areas, which were then used to determine intra-sample, intra-study, intra-region and inter-region variation in TLs. Considerable variation in TLs of species between areas was observed. This is likely due to differences in parameter choice in estimating TLs (e.g. choice of baseline species) and seasonal, temporal and spatial influences. TLs between regions were higher than the variance observed within regions, studies or samples. This implies that TLs derived within one region may not be suitable as a proxy for the Arctic as a whole. The TL distributions derived in this study may be useful in bioaccumulation and climate change studies, as these provide insight in the variability of trophic levels of Arctic species.

Ontogenetic Niche Shifts

2013 ◽  
Author(s):  
André M. de Roos ◽  
Lennart Persson
Keyword(s):  
Life History ◽  
Extended Model ◽  
Full Model ◽  
Life History Stages ◽  
Ontogenetic Diet Shifts ◽  
Ontogenetic Niche Shifts ◽  
Niche Shifts ◽  
Limited Supply ◽  
Diet Shifts ◽  
Parameter Values

This chapter considers the consequences for community structure of ontogenetic diet shifts that involve the use of different resources in different life history stages, whereby these resources are in limited supply and are hence competed for by all individuals foraging on them. It explores the consequences of ontogenetic diet shifts using stage-structured biomass models that account for two basic resources, a stage-structured consumer population, for which we distinguish between juveniles and adults, and up to two unstructured predator populations. The most extended model is therefore closely related to the model analyzed in Chapter 5, except for the inclusion of an additional basic resource. The equations of the full model are summarized and default parameter values are listed.

scholarly journals A Review of Galaxias (Galaxiidae) Fossils from the Southern Hemisphere

Diversity ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 208
Author(s):  
Uwe Kaulfuss ◽  
Daphne E. Lee ◽  
Jeffrey H. Robinson ◽  
Graham P. Wallis ◽  
Werner W. Schwarzhans
Keyword(s):  
New Zealand ◽  
Southern Hemisphere ◽  
Fossil Record ◽  
New Caledonia ◽  
Adult Fish ◽  
Gut Content ◽  
Ontogenetic Diet Shifts ◽  
Subantarctic Islands ◽  
Diet Shifts

The Galaxiidae is a Southern Hemisphere family of freshwater fish, considered to be of Gondwanan origin based on the current distribution of species in New Zealand, Australia (including Tasmania), New Caledonia, Africa, South America, and on some associated and subantarctic islands. The fossil record of galaxiids is extremely sparse and geographically restricted. The only galaxiid fossils currently known come from several Miocene lakes in southern New Zealand. They include more than 100 articulated fishes, some remarkably preserving soft parts such as eyes and skin, skulls and jaw components, and more than 200 isolated otoliths. Common coprolites and in situ preserved gut content at one site (Foulden Maar) indicate the different diets of larvae and adult fish. These discoveries reveal a diverse Galaxias fauna, the presence of lake-locked populations, ontogenetic diet shifts, and representatives of several non-migratory Galaxias lineages associated with inland streams and lakes. There are at least six Galaxias species based on macrofossils and six separate otolith-based species from varied volcanic and regional lacustrine environments. This diversity points to southern New Zealand as a centre of biodiversity and speciation in Galaxiidae in the early to late Miocene.

Stable isotopes reveal habitat-related diet shifts in facultative deposit-feeders

2015 ◽  
Vol 95 ◽  
pp. 172-179 ◽  
Author(s):  
Francesca Rossi ◽  
Alexandra Baeta ◽  
João C. Marques
Keyword(s):  
Stable Isotopes ◽  
Deposit Feeders ◽  
Diet Shifts
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