The rate of metabolism in marine animals: environmental constraints, ecological demands and energetic opportunities
- B. Seibel, J. Drazen
- Biology, Environmental SciencePhilosophical Transactions of the Royal Society B…
- 29 November 2007
The conclusion from this analysis is that low rates of metabolism, in the deep sea and elsewhere, do not result from resource limitation or temperature or pressure constraint, and high metabolic demand follows strong selection for locomotory capacity among visual predators inhabiting well-lit oceanic waters.
Trophic position estimates of marine teleosts using amino acid compound specific isotopic analysis
The increasing use of trophic position (TP) for assessing and describing ecosystems has resulted in the emergence of novel techniques for accurate and accessible measurements. The strength of amino…
Plastic for dinner? Observations of frequent debris ingestion by pelagic predatory fishes from the central North Pacific
Ingested debris pieces were found to be positively buoyant in seawa- ter mimicking different depths, and suggest that more attention should be given to marine debris in subsurface waters as well as to poorly understood organismal and food web implications.
Methylmercury production below the mixed layer in the North Pacific Ocean
We document a systematic decline in 202 Hg, 1 199 Hg and 1 201 Hg values with the depth at which fish feed. We show that these mercury isotope trends can be explained only if monomethylmercury is…
The influence of depth on mercury levels in pelagic fishes and their prey
- C. Choy, B. Popp, J. Kaneko, J. Drazen
- Environmental ScienceProceedings of the National Academy of Sciences
- 18 August 2009
Results indicate that total mercury levels of predatory pelagic fishes and their prey increase with median depth of occurrence in the water column and mimic concentrations of dissolved organic mercury in seawater, suggesting that the mesopelagic habitat is a major entry point for mercury into marine food webs.
Global Trophic Position Comparison of Two Dominant Mesopelagic Fish Families (Myctophidae, Stomiidae) Using Amino Acid Nitrogen Isotopic Analyses
It is found that trophic positions estimated from the δ15N values of individual amino acids are nearly uniform within both families of these fishes across five global regions despite great variability in bulk tissue δ 15N values.
Lipid, sterols and fatty acid composition of abyssal holothurians and ophiuroids from the North-East Pacific Ocean: food web implications.
Near-island biological hotspots in barren ocean basins
It is shown that IME is a near-ubiquitous feature among a majority (91%) of coral reef ecosystems surveyed, creating near-island ‘hotspots' of phytoplankton biomass throughout the upper water column.
Midwater zooplankton and suspended particle dynamics in the North Pacific Subtropical Gyre: A stable isotope perspective
The main mechanism driving 15N enrichment of suspended particles appears to be isotope fractionation associated with heterotrophic degradation, rather than a change in trophic status or N source with depth, and both changes in the d15N values of food resources at the base of the zooplankton food web and changes in zoopLankton TP drive observed zoop lankton 15N enriched with depth.
Bypassing the abyssal benthic food web: Macrourid diet in the eastern North Pacific inferred from stomach content and stable isotopes analyses
- J. Drazen, B. Popp, C. Choy, Tara M. Clemente, L. D. Forest, Kenneth L. Smith
- Environmental Science
- 1 November 2008
Results of isotope mass balance suggest that carrion was the most important prey resource for both species but to a lesser extent in C. yaquinae, which bypass the conventional phytodetritus-based abyssal food web for much of their nutrition.