The diet and trophic positions of translocated, sympatric populations of Cherax destructor and Cherax cainii in the Hutt River, Western Australia: evidence of resource overlap

2006 ◽  
Vol 57 (8) ◽  
pp. 825 ◽  
Author(s):  
Stephen J. Beatty
Keyword(s):  
Western Australia ◽  
Trophic Position ◽  
Keystone Species ◽  
Sympatric Populations ◽  
Resource Overlap ◽  
Cherax Destructor ◽  
Aquatic Food ◽  
Isotope Analyses ◽  
Cycling Of Nutrients ◽  
Assimilated Diet

This study tested the hypothesis that the introduced yabbie Cherax destructor Clark, 1936 has the potential to compete with the endemic marron Cherax cainii Austin, 2002 for food resources. Multiple stable isotope analyses were conducted in the Hutt River, Western Australia, in summer (December) and winter (July), 2003. Summer samples indicated that these species occupied similar predatory trophic positions when their assimilated diet consisted of a large proportion of Gambusia holbrooki. Although C. cainii continued to assimilate mostly animal matter based on winter signatures, those of C. destructor appeared to shift towards a more herbivorous trophic position. The study suggests that C. destructor and C. cainii may be keystone species in the Hutt River, possibly altering the cycling of nutrients and structure of the aquatic food web since their introduction into this system. The ecological implications of the continued invasion of C. destructor into the aquatic systems of south-western Australia, particularly with regard to competition with the other endemic freshwater crayfishes, are discussed.

scholarly journals Eutrophication induces shifts in the trophic position of invertebrates in aquatic food webs

Ecology ◽  
2020 ◽  
Author(s):  
Gea H. Lee ◽  
J. Arie Vonk ◽  
Ralf C.M. Verdonschot ◽  
Michiel H.S. Kraak ◽  
Piet F.M. Verdonschot ◽  
...  
Keyword(s):  
Food Webs ◽  
Trophic Position ◽  
Aquatic Food Webs ◽  
Aquatic Food

The trophic ecology of partial migration: insights from Merluccius australis off NW Patagonia

2020 ◽  
Vol 77 (5) ◽  
pp. 1927-1940
Author(s):  
Pamela Toledo ◽  
Edwin J Niklitschek ◽  
Audrey M Darnaude ◽  
Félix P Leiva ◽  
Chris Harrod ◽  
...  
Keyword(s):  
Life Cycle ◽  
Habitat Use ◽  
Diet Composition ◽  
Trophic Ecology ◽  
Trophic Position ◽  
Life Cycles ◽  
Partial Migration ◽  
Otolith Chemistry ◽  
Management Approaches ◽  
Isotope Analyses

Abstract Partial migration, where migrant and resident organisms coexist within the same population, has been found in many fishes. Although it seems obvious that different life cycles exploit habitats and food webs differently, few assessments about the trophic consequences of partial migration are available. To unveil part of this complexity, we combined otolith chemistry with stable isotope analyses data for hind-casting Merluccius australis habitat use and diet composition at age. By providing detailed information about lifetime variability in diet, trophic position, and prey demand of four M. australis life-cycle types, we show that these groups feed differentially in estuarine and oceanic habitats throughout their ontogeny. Although trophic positions were similar between habitats for juvenile and subadults, substantial differences between life-cycle types were found regarding lifetime diet and trophic demand. Thus, the more abundant and heavily exploited oceanic stock of M. australis was heavily dependent of estuarine habitats within the Patagonian Fjords System, where it consumes large biomasses of Macruronus magellanicus, Pasiphaea, Sprattus fuegensis, and Euphausiidae at earlier stages. We show ignoring trophic consequences of partial migration and life-cycle diversity may produce highly biased results, both in terms of prey and habitat use, which appears critical for multispecies and ecosystem management approaches.

The Trophic Position of Pleistocene and Modern Brown Bears (Ursus arctos) of Yakutia Based on Stable Isotope Analyses

2020 ◽  
Vol 47 (8) ◽  
pp. 1013-1021
Author(s):  
O. A. Krylovich ◽  
G. G. Boeskorov ◽  
M. V. Shchelchkova ◽  
A. B. Savinetsky
Keyword(s):  
Stable Isotope ◽  
Ursus Arctos ◽  
Trophic Position ◽  
Brown Bears ◽  
Stable Isotope Analyses ◽  
Isotope Analyses

Trophic position of deep-sea fish—Assessment through fatty acid and stable isotope analyses

2009 ◽  
Vol 56 (5) ◽  
pp. 812-826 ◽  
Author(s):  
G. Stowasser ◽  
R. McAllen ◽  
G.J. Pierce ◽  
M.A. Collins ◽  
C.F. Moffat ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Stable Isotope ◽  
Deep Sea ◽  
Trophic Position ◽  
Stable Isotope Analyses ◽  
Sea Fish ◽  
Isotope Analyses

scholarly journals Trophic position derived from amino-acid nitrogen isotopes reflect physiological status of both predator and prey over four decades

2021 ◽  
Author(s):  
Agnes ML Karlson ◽  
Caroline Ek ◽  
Douglas Jones
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Baltic Sea ◽  
Food Webs ◽  
Trophic Ecology ◽  
Trophic Position ◽  
Physiological Status ◽  
Ecological Knowledge ◽  
Ecological Data ◽  
Isotope Analyses

AbstractNitrogen isotope analyses of amino-acids (δ15N-AA) are increasingly used to decipher food webs. Interpretation of δ15N-AA in consumers relies on the assumption that physiological status has a negligible influence on the trophic enrichment factor (TEF). Recent experiments have shown that this is not always the case and there is a need to validate derived trophic position (TP) estimates using ecological data. We analyzed δ15N-AA in cod and herring (1980-2019) from the Baltic Sea, a species-poor system where dramatic reduction in condition status of cod has occurred. We expected that TEFcod-herring in trophic AAs would increase during periods of poor cod growth, resulting in inflated TP estimates. We found that TEF and TP estimates were negatively linked to individual condition status, prey fat content and the hypoxic state of the ecosystem. Statistically adjusting for these variables resulted in lower cod TP, highlighting the importance of including ecological knowledge when interpreting TP.Scientific Significance StatementNitrogen stable isotope analyses in amino acids are increasingly used in ecology to understand how environmental change impacts food-webs. Specifically, it is used to more accurately calculate trophic position (TP) of consumers. Controlled experiments have shown that physiological status can alter amino acid isotope composition and TP interpretation, but field studies are lacking. We use 40 years of archived material to demonstrate that TP estimates in Baltic Sea cod and its prey herring are directly related to physiological status. This has important implications for interpreting the real trophic ecology of consumers under environmental stress. By simultaneously measuring condition status in both predator and prey it is possible to adjust for them as confounding variables and decipher actual consumer TP.

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 Paleodiet Reconstruction of Human Remains from the Archaeological Site of Natfieh, Northern Jordan

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 645-652 ◽  
Author(s):  
Khaled Al-Bashaireh ◽  
Abdullah Al-Shorman ◽  
Jerome Rose ◽  
A J Timothy Jull ◽  
Gregory Hodgins
Keyword(s):  
Past Research ◽  
Archaeological Site ◽  
Common Source ◽  
Long Distance ◽  
Human Teeth ◽  
Time Period ◽  
New Information ◽  
Aquatic Food ◽  
Isotope Analyses ◽  
Northern Jordan

This investigation concerns human teeth and bones from the site of Natfieh, north Jordan. Nitrogen and carbon isotope analyses were used to model the paleo-economy by reconstructing Natfieh's paleodiet during a specific time period.14C dating of human teeth and bones from the site of Natfieh, north Jordan, demonstrate that they belong to the Early Roman period and match the archaeological date from the tomb and grave goods typology. Stable isotope analyses of these humans have provided new information about the subsistence and society of individuals buried at Natfieh. Natfieh is today agriculturally productive and must have been so in antiquity with most of the foodstuffs having been produced locally. The long distance between Natfieh and the closest aquatic food source (Mediterranean Sea and Lake Tiberias) and the high cost of land transportation might be the reason for the low consumption of marine protein. The results agree with past research on the Roman diet showing that plants were the common source of food for the Romans and fish may have been restricted to elite members of the society.

Mercury biomagnification in a contaminated estuary food web: Effects of age and trophic position using stable isotope analyses

2013 ◽  
Vol 69 (1-2) ◽  
pp. 110-115 ◽  
Author(s):  
J.P. Coelho ◽  
C.L. Mieiro ◽  
E. Pereira ◽  
A.C. Duarte ◽  
M.A. Pardal
Keyword(s):  
Stable Isotope ◽  
Food Web ◽  
Trophic Position ◽  
Stable Isotope Analyses ◽  
Isotope Analyses
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