A5006688028- Marine and fisheries research
- Isotope Analysis in Ecology
- Marine Bivalve and Aquaculture Studies
- Fish Ecology and Management Studies
- Marine and coastal ecosystems
- Ichthyology and Marine Biology
- Marine Biology and Ecology Research
- Coral and Marine Ecosystems Studies
- Oceanographic and Atmospheric Processes
- Aquaculture Nutrition and Growth
- Marine animal studies overview
- Environmental DNA in Biodiversity Studies
- Microbial Community Ecology and Physiology
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal plant biology
- Ocean Acidification Effects and Responses
- Oil Spill Detection and Mitigation
- Avian ecology and behavior
- Cephalopods and Marine Biology
- Physiological and biochemical adaptations
- Identification and Quantification in Food
- Fish Biology and Ecology Studies
- Global Energy and Sustainability Research
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
Center for Scientific Research and Higher Education at Ensenada
2014-2024
The University of Texas at Austin
1997-2024
Ensenada Institute of Technology
2002-2023
Universidad del Golfo
2023
The stable isotope composition of larval fish tissues may serve as a chemical tracer recent settlement due to food web differences among planktonic and demersal habitats. We present the background for utilization δ 13 C 15 N trace red drum (Sciaenops ocellatus), an estuarine-dependent species. effect ontogeny temperature on relative contribution growth metabolic turnover changes in isotopic was examined by simulating dietary shifts laboratory. Fractionation function size deprivation...
There are very few studies reporting isotopic trophic discrimination factors and turnover rates for marine elasmobranchs. A controlled laboratory experiment was conducted to estimate carbon nitrogen isotope blood, liver, muscle, cartilage tissue, fin samples of neonate young-of-the-year leopard sharks ( Triakis semifasciata ). Trophic varied (0.13‰–1.98‰ δ 13 C 1.08‰–1.76‰ 15 N). Tissues reached or were close equilibrium the new diet after about a threefold biomass gain 192 days. Liver blood...
Four diets were formulated to evaluate the partial total substitution of fishmeal with poultry by-product meal (PBM) (0, 33, 67 and 100PBM) in for totoaba juveniles (Totoaba macdonaldi). Amino acid profiles from fatty content muscle tissue used assess fish performance using PBM as replacement. Stable isotopes nitrogen (δ15N) measured liver quantify retention each protein source. At end experimental period, fed 67PBM diet had a significantly higher growth gain increase compared other...
We assessed metrics of the metazoan parasite infracommunities dusky flounder (Syacium papillosum) as indicators aquatic environmental health Yucatan Shelf (YS) prior to oil extraction. sampled and its parasites along YS, mostly during 2015 north wind season (November–April). Our aims were: (i) determine whether infracommunity S. papillosum exhibit significant differences among YS subregions; (ii) probability occurrence species individuals were affected by variables, nutrients, heavy metals...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 152:103-117 (1997) - doi:10.3354/meps152103 Seasonal photosynthetic patterns of seagrass Thalassia testudinum in western Gulf Mexico Herzka SZ, Dunton KH performance was compared between 2 distinct populations Texas (USA) during an annual period. The validity using laboratory leaf incubations set light...
Abstract We evaluated whether the trophic level and feeding grounds (coastal versus offshore) of white shortfin mako sharks captured in northern Mexican Pacific varied as a function size using carbon (δ 13 C values) nitrogen 15 N stable isotope analysis soft tissues. A step increase δ values was observed at approximately 85 cm TL 150–170 for sharks, respectively, consistent with dilution maternal isotopic signal following incorporation exogenous food. Shortfin shark muscle tissue whole blood...
This is second part from an experiment where the nitrogen retention of poultry by-product meal (PBM) compared to fishmeal (FM) was evaluated using traditional indices. Here a quantitative method stable isotope ratios (δ15N values) as natural tracers incorporation into fish biomass assessed. Juvenile rainbow trout (Oncorhynchus mykiss) were fed for 80 days on isotopically distinct diets in which 0, 33, 66 and 100% FM main protein source replaced by PBM. The isonitrogenous, isolipidic similar...
Compound-specific isotope analysis (CSIA) of amino acids (AAs) in consumer tissues is a developing technique with wide-ranging applications for identifying nitrogen (N) sources and estimating animal trophic level. Controlled experiments are essential determining which dietary conditions influence variability N stable isotopes (δ15N) enrichment factors bulk tissue (TEFbulk) AAs (TEFAA). To date, however, studies have not independently evaluated the effect protein quantity quality...
As upper-level predators, sharks are important for maintaining marine food web structure, but populations threatened by fishery exploitation. Sustainable management of shark requires improved understanding migration patterns and population demographics, which has traditionally been sought through physical and/or electronic tagging studies. The application natural tags such as elemental variations in mineralized band pairs elasmobranch vertebrae cartilage could also reveal endogenous...
Yellowfin tuna (YFT, Thunnus albacares) is a commercially important species targeted by fisheries in the Gulf of Mexico (GM). Previous studies suggest high degree residency northern GM, although part population performs movements to southern Mexican waters. Whether YFT caught waters also exhibit or migrate gulf currently uncertain, and little known regarding their trophic ecology. The isotopic composition (bulk & amino acids) muscle liver tissues were compared zooplankton-based synoptic...
We describe the larval occurrence and density of six fish species with contrasting life histories examine their relationships oceanographic variables during two seasons in deep-water region (> 1000 m) southern Gulf Mexico based on 12 cruises (2011–2018). Given that Caranx crysos adults are neritic, presence close to continental shelf indicates offshore cross-shelf transport oceanic waters, which likely leads mortality. Generalized additive models indicated C . was not related variables,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 226:143-156 (2002) - doi:10.3354/meps226143 Characterization of settlement patterns red drum Sciaenops ocellatus larvae estuarine nursery habitat: a stable isotope approach Sharon Z. Herzka*,**, Scott A. Holt, G. Joan Holt Science Institute, University Texas at Austin, 750 Channelview Drive, Port Aransas,...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 361:253-265 (2008) - DOI: https://doi.org/10.3354/meps07390 Tracking juvenile fish movement and nursery contribution within arid coastal embayments otolith microchemistry F. Joel Fodrie1,3,*, Sharon Z. Herzka2 1Integrative Oceanography Division, Scripps Institution of Oceanography, Mail Code 0218, La Jolla,...
Abstract Four ichthyoplankton cruises and backward tracking experiments were conducted to study the connectivity of coastal neritic fish larvae over continental slope oceanic deep‐water region western Gulf Mexico. Distribution patterns larval abundance at stations showed higher presence during two cruises. Larval transport was simulated using outputs a data assimilation model that represented flow conditions each cruise. Higher abundances species agreed with offshore inferred from numerical...
Zooplankton plays a pivotal role in sustaining the majority of marine ecosystems. The distribution patterns and diversity zooplankton provide key information for understanding functioning these Nevertheless, due to numerous cryptic sibling species lack diagnostic characteristics early developmental stages, identification global-to-local biodiversity biogeography remains challenging different research fields. spatial temporal changes community open waters southern Gulf Mexico were assessed...
Competition between fisheries and bottlenose dolphins is a globally relevant conflict given its socioeconomic ecological implications. Understanding the factors driving interactions fishery activities key to development of appropriate mitigation strategies. Our study aimed assess whether these are related ecological, trophic, nutritional characteristics catch. We used 117 gillnet sets from 48 fishing trips during 2009 – 2010 2015 2019, which were classified based on presence or absence...
Understanding the role of diet in physiological condition adults during reproduction and hence its effect on reproductive performance is fundamental to understand strategies long-lived animals. In birds, little known about influence quality food consumed at beginning period short-term effects performance. To assess female blue-footed booby, Sula nebouxii (BFBO), we evaluated whether individual differences (assessed by using δ13C δ15N values whole blood from birds muscle tissue principal prey...