A5070856924- Marine and coastal plant biology
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Environmental Chemistry
- Ocean Acidification Effects and Responses
- Marine and fisheries research
- Crustacean biology and ecology
- Aquaculture Nutrition and Growth
- Coral and Marine Ecosystems Studies
- Marine animal studies overview
- Isotope Analysis in Ecology
- Fish Ecology and Management Studies
- Polar Research and Ecology
- Environmental Toxicology and Ecotoxicology
- Ichthyology and Marine Biology
- Marine Ecology and Invasive Species
- Reproductive biology and impacts on aquatic species
- Marine Sponges and Natural Products
- Echinoderm biology and ecology
- Seaweed-derived Bioactive Compounds
- Crystallization and Solubility Studies
- Microbial Community Ecology and Physiology
- Avian ecology and behavior
- Bioactive Compounds and Antitumor Agents
- Pancreatic function and diabetes
University of Alabama at Birmingham
2015-2025
University of South Florida
2009
University of California, Santa Barbara
1991
University of North Carolina Wilmington
1984-1985
The Southern Ocean is considered to be the canary in coal mine with respect first effects of ocean acidification (OA). This vulnerability due naturally low carbonate ion concentrations that result from effect temperature on acid-base dissociation coefficients, high solubility CO2 at temperature, and mixing. Consequently, two calcium polymorphs, aragonite calcite, are expected become undersaturated within 50 100 years, respectively. Marine invertebrates such as echinoderms, whose skeletons...
Significance For tens of millions years, cold conditions have excluded shell-crushing fish and crustaceans from the continental shelf surrounding Antarctica. Rapid warming is now allowing predatory to return. Our study slope off western Antarctic Peninsula showed that abundant, king crabs comprise a reproductively viable population at 841- 2,266-m depth. Depth profiles temperature, salinity, habitat structure, food availability, predators indicate there are no barriers prevent moving upward...
Abstract Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO 3 ) minerals have raised concerns about the consequences marine organisms that build CaCO structures. A large proportion of benthic calcifiers incorporate Mg 2+ into their skeletons (Mg‐calcite), which, in general, reduces mineral stability. The relative vulnerability some ocean appears linked solubility shell or skeletal mineralogy, although sophisticated mechanisms for constructing...
Macroalgal forests dominate shallow hard bottom areas along the northern portion of Western Antarctic Peninsula (WAP). biomass and diversity are known to be dramatically lower in southern WAP at similar latitudes around Antarctica, but few reports detail distributions macroalgae or associated macroinvertebrates central WAP. We used satellite imagery identify 14 sites differing sea ice coverage terms turbidity Fleshy macroalgal cover was strongly, negatively correlated with concentration,...
Abstract The Western Antarctic Peninsula supports a diverse assemblage of > 100 described macroalgal species that contribute to the base coastal food webs, but their contribution local nearshore webs is still uncertain across larger spatial scales. analysis biomarkers, specifically fatty acids and stable isotopes, offers tool clarify trophic role macroalgae. aim this study was describe acid profiles isotope values 31 algal from three divisions (Chlorophyta—1, Ochrophyta—8, Rhodophyta—22)...
Abstract Sea ice can profoundly influence photosynthetic organisms by altering subsurface irradiance, but it is susceptible to changes in the climate. The patterns and timing of sea cover vary on a monthly annual timescale small sub‐regions Western Antarctic Peninsula (WAP). During latter part 20th century, coverage significantly decreased WAP, trend that aligns with warming this area. Macroalgal biochemical components are impacted light availability, often showing close relationship between...
Abstract Investigating taxa at varying stages of divergence can shed light on the evolutionary forces that lead to reproductive isolation and eventual speciation. The promoting vary in space time, which makes it difficult reconstruct trajectory resulted observed among species today. red macroalgal genus Plocamium is known worldwide for its cryptic genetic chemical diversity. Previous work Antarctica two haplotypes along western Antarctic Peninsula have been treated as same species. Using 10...
Abstract Increases in atmospheric CO 2 have led to more entering the world’s oceans, decreasing pH a process called ’ocean acidification’. Low has been linked impacts on macroalgal growth and stress, which can alter palatability herbivores. Two common ecologically important species from western Antarctic Peninsula, unpalatable Desmarestia menziesii palatable Palmaria decipiens , were maintained under three treatments: ambient (pH 8.1), near future (7.7) distant (7.3) for 52 days 18 days,...
The biochemical composition of the embryos Callinectes sapidus, spawned early in reproductive season North Carolina waters (water temperature 12–16°C), is compared with later temperatures greater than 24°C). Embryos (cultured at 16°C) have initially lipid levels, an equivalent amount protein, and a lower carbohydrate caloric content 26°C). During development 26°C embryos, lipids are utilized significant rate, but 16°C protein to extent. Overall, 45% 35% during versus 55% 34% embryos. In...
AbstractAmsler C.D., Amsler M.O., McClintock J.B. and Baker B.J. 2009. Filamentous algal endophytes in macrophytic Antarctic algae: prevalence hosts palatability to mesoherbivores. Phycologia 48: 324–334. DOI: 10.2216/08-79.1.Five individuals, each from 13 common species of large macroalgae ('macrophytes') the western Peninsula, were surveyed for presence filamentous both macroscopically microscopically using dissecting compound microscopes. Of surveyed, either rare or absent five. The...
Abstract Nearshore marine benthic algal communities along the western Antarctic Peninsula harbour extremely high densities of amphipods that probably play important roles in nutrient and energy flow. This study extends our evaluation importance nearshore Peninsular focuses on sponge associations. We found a mean density 542 per litre (L) for twelve species ecologically dominant sponges. The highest (1295 L sponge) occurred with Dendrilla membranosa Pallas. amphipod community associated 12...
Five new steroids, norselic acids A−E (1−5), were isolated from the sponge Crella sp. collected in Antarctica. The planar structures of established by extensive NMR spectroscopy and mass spectrometry studies, configuration acid A (1) was elucidated X-ray crystallography. Norselic displays antibiotic activity against methicillin-resistant Staphylococcus aureus (MRSA), methicillin-sensitive S. (MSSA), vancomycin-resistant Enterococcus faecium (VRE), Candida albicans reduces consumption food...
Plocamium cartilagineum is a common red alga on the benthos of Antarctica and can be dominant understory species along western Antarctic Peninsula. Algae from this region have been studied chemically, like “P. cartilagineum” other worldwide locations where it common, rich in halogenated monoterpenes, some which implicated as feeding deterrents toward sympatric algal predators. Secondary metabolites are highly variable alga, both qualitatively quantitatively, leading us to probe individual...
Abstract The nutritional compositions of 40 antarctic macroalgal species from the western Antarctic Peninsula were analyzed during two periods, one early in growing season and late season. Protein levels greater than those reported macroalgae temperate tropical latitudes. These high protein are presumed to be related nutrient-rich waters which reside. There was a significant interaction between time as well taxonomic grouping for collected both seasons. A total 36 further percent N C their :...
Abstract Antiherbivore effects of phlorotannins from eight common Antarctic brown algae were tested with three omnivorous sympatric grazers, the fish Notothenia coriiceps , sea star Odontaster validus, and amphipod Gondogeneia antarctica . Incidence grazing deterrence overall was relatively low, only a few algal species deterring each different active against grazers. Most activity found in Desmarestia menziesii Cysto-sphaera jacquinotii which deterred two out while D anceps Himantothallus...
Abstract We reviewed photographic images of fishes from depths 381–2282 m in Marguerite Bay and 405–2007 the Amundsen Sea. were 33% notothenioids 67% non-notothenioids. Channichthyids (47%) nototheniids (44%) most abundant notothenioids. The deep-living channichthyid Chionobathyscus dewitti (74%) nototheniid genus Trematomus (66%) taxa within these two families. non-notothenioids macrourid Macrourus whitsoni (72%) zoarcids (18%). Sea 87% 13% non-notothenioids, latter exclusively ....
Abstract Gastropods are an important component of subtidal Antarctic communities including in common association with macroalgae. Nonetheless, limited data exist detailing their abundance and distribution on macroalgal species. This study documents the species composition gastropod assemblages two largest, blade-forming macroalgae, Himantothallus grandifolius Sarcopeltis antarctica , sampled across depths (9 18 m) at four sites for each off Anvers Island, Antarctica. were also enumerated...
ABSTRACT Several lines of evidence suggest that reproductive development in Antarctic krill is not a simple stepwise process. We present new method for staging sexual female krill, and key which can be used live animals Formalin-fixed samples. The takes into account general appearance, thelycum development, ovarian morphology, developmental steps changes the cells. This based on results histological study but use itself involves only observations rapid execution squash from piece ovary....