A5066239927- Isotope Analysis in Ecology
- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine animal studies overview
- Ichthyology and Marine Biology
- Coastal wetland ecosystem dynamics
- Marine Bivalve and Aquaculture Studies
- Mercury impact and mitigation studies
- Geology and Paleoclimatology Research
- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Fish Biology and Ecology Studies
- Marine and coastal ecosystems
- Oil Spill Detection and Mitigation
- Atmospheric and Environmental Gas Dynamics
- Identification and Quantification in Food
- Toxic Organic Pollutants Impact
- Environmental DNA in Biodiversity Studies
- Aquatic Ecosystems and Phytoplankton Dynamics
- Animal Diversity and Health Studies
- Aeolian processes and effects
- Aquatic Ecosystems and Biodiversity
- Aquaculture Nutrition and Growth
- Pacific and Southeast Asian Studies
- Plant and animal studies
Michigan Technological University
2018-2025
Louisiana State University
2013-2022
Stony Brook University
2017-2019
University of Windsor
2009-2018
Austin Peay State University
2014
Stable isotopes of neonatal vertebrates reflect those their mother's diet and foraging location. Evaluating feeding strategies habitat use neonates is consequently complicated by the maternal isotopic signal its subsequent elimination with growth. Thus, methods that measure loss signal, i.e. when a neonate reflects own diet, are needed. Values δ 13 C 15 N were measured in liver muscle tissues <1 year old bull ( Carcharhinus leucas ) Atlantic sharpnose Rhizoprionodon terraenovae sharks...
Stable nitrogen (δ 15 N) and carbon 13 C) isotopes of Atlantic sharpnose shark Rhizoprionodon terraenovae embryos mothers were analysed. Embryos generally enriched in N all studied tissue relative to their mothers' tissue, with mean differences between mother embryo δ (i.e. Δδ being 1·4‰ for muscle, 1·7‰ liver 1·1‰ cartilage. Embryo muscle C (both means = 1·5‰) cartilage was depleted (Δδ −1·01‰) corresponding maternal tissues. While significant, values indicated be within the range expected...
Polychlorinated biphenyls (PCBs) were quantified in liver tissues of bull sharks (Carcharhinus leucas) ranging age from <4 wk to >3 yr. Summed values PCBs (ΣPCBs) ranged 310 ng/g 22 070 (lipid wt) across classes with ΣPCB concentrations for the youngest present study (<4 wk; 5230 ± 2170 lipid determined not significantly differ those >3-yr-old sharks, highlighting extent exposure this young life stage class persistent organic pollutants (POPs). Age normalization PCB congener measured...
The application of stable isotopes to characterize the complexities a species foraging behavior and trophic relationships is dependent on assumptions δ15N diet-tissue discrimination factors (∆15N). As ∆15N values have been experimentally shown vary amongst consumers, tissues diet composition, resolving appropriate species-specific can be complex. Given logistical ethical challenges controlled feeding experiments for determining large and/or endangered species, our objective was conduct an...
In addition to external oiling, marine oil spills may affect vertebrate animals through degradation of habitat; alterations in food web structure; and contamination resources by toxic compounds, including polycyclic aromatic hydrocarbons. These processes are not well understood for vertebrates breeding foraging terrestrial ecosystems affected oil, such as coastal marshes that were heavily oiled following the 2010 Macondo spill. Here, we review what is known about ecological physiological...
Abstract Throughout their life history, many animals transition among heterogeneous environments to facilitate behaviours such as reproduction, foraging and predator avoidance. The dynamic environmental biological conditions experienced by mobile species are integrated in the chemical composition of tissues, providing retrospective insight into movement. Here, we present a unique application nitrogen stable isotope clocks (‘isotopic clocks’), which integrate tissue turnover rates, consumer...
Abstract Body size is considered an important structuring mechanism of food webs because consumers are usually larger and more mobile than their prey may couple energy among habitats. We explored the links trophic position (TP), body size, coupling different channels (phytoplankton C4‐marsh plants) in a saltmarsh landscape northern Gulf Mexico—a dynamic system weakly shaped by biotic interactions. was positively associated with TP, this relationship stronger phytoplankton pathway vs....
Abstract Large‐scale ecosystem disturbances can alter the flow of energy through food webs, but such processes are not well defined for Gulf Mexico saltmarsh ecosystems vulnerable to multiple interacting stressors. The 2010 Deepwater Horizon (DWH) oil spill significantly affected composition terrestrial communities in Louisiana, and thus had potential pathways aquatic with direct consequences higher trophic‐level species restricted these habitats. Seaside Sparrow ( Ammodramus maritimus ) is...
ESR Endangered Species Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 32:491-506 (2017) - DOI: https://doi.org/10.3354/esr00824 Theme Section: Biology and ecology of sawfishes Sympatric elasmobranchs fecal samples provide insight into trophic smalltooth sawfish Gregg R. Poulakis1,*, Hidetoshi Urakawa2, Philip W. Stevens3, Jacquelyn A. DeAngelo1, Amy Timmers1, Dean Grubbs4, Aaron T....
Determining the flow of energy from primary producers to higher trophic levels in complex systems remains an important task for ecologists. Biomarkers can be used trace carbon or sources contributing organism's tissues. However, different biomarkers vary their ability based on how faithfully they transfer between levels. Comparing emerging biomarker techniques with more commonly demonstrate relative efficacy each specific systems.Two common techniques, fatty acid analysis (FAA) and bulk...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 487:55-69 (2013) - DOI: https://doi.org/10.3354/meps10402 Seasonal variability in stable isotopes of estuarine consumers under different freshwater flow regimes Jill A. Olin1,4,*, Nigel E. Hussey1, Scott Rush1,5, Gregg R. Poulakis2, Colin Simpfendorfer3, Michelle Heupel3, Aaron T. Fisk1 1Great Lakes Institute...
A multinational demersal longline survey was conducted on the Gulf of Mexico continental shelf over years 2015 and 2016 to generate a Gulf-wide baseline polycyclic aromatic hydrocarbon (PAH) concentrations in fishes. Tilefish (Lopholatilus chamaeleonticeps) were sampled all regions for biometrics, bile, liver. liver also obtained from surveys northwest Atlantic Ocean comparison. Liver tissues (n = 305) analyzed PAHs select alkylated homologs using QuEChERS extractions gas chromatography...
Abstract Elasmobranch fin tissue has been sampled and archived for decades to support genetics research. However, these collections have the potential provide additional information on trophic ecology of habitat use by elasmobranch species. The is especially attractive considering threatened status many elasmobranchs call limiting mortalities. Yet, samples stable isotope analysis requires either that (1) storage methods do not alter values or (2) any alterations in composition occur during...
The abundances of migratory shark species observed throughout the Mid-Atlantic Bight (MAB) during productive summer months suggest that this region provides critical habitat and prey resources to these taxa. However, principal assemblages sustaining biomass in are poorly defined. We applied high-throughput DNA metabarcoding feces derived from cloacal swabs across nine Carcharhinid Lamnid sharks (1) quantify contribution broad taxa (e.g., invertebrates, fishes) supporting seasonal residency...