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In other celebrity mama-related news, Briefly. The TV radio personality Pearl Modiadie took to Instagram to share some stunning pregnancy pictures from multiple shoots she had while she was still pregnant prior to giving birth in September. The study conclusively demonstrated that dust can be incorporated in the coral skeleton. Anthropogenic air pollutants such as lead and cadmium Shen and Boyle and cesium radioisotope Cs from nuclear testing have been detected in coral skeletons.

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Current studies indicate that a record of past environmental conditions, including dust deposition, may be reconstructed using laser ablation inductively coupled plasma mass spectrometry LA-ICP-MS to extract the record preserved in coral skeleton annual bands Sinclair et al. Our understanding of the impact of dust on biogeochemical cycles is limited. Aeolian dust contributes significant quantities of water-soluble nutrients to the oligotrophic Caribbean Jickells , the Gulf of Mexico e.

The influx of nutrients from Asian dust events is reported to fuel phytoplankton productivity in the northern Pacific e. Atmospheric deposition is thought to be the dominant source of iron in the ocean's photic zone Duce and Tindale Iron, a micronutrient, can limit phytoplankton productivity in oligotrophic waters; newly deposited iron is quickly depleted by phytoplankton e.

Turner and colleagues showed that iron flux to the oceans leads to the biotic production of dimethylsulfide DMS and its release into the atmosphere. Subsequent oxidation of DMS and formation of sulfate in turn produces sulfuric acid, which with atmospheric mixing could increase the solubility of iron in the form Fe [III] in the mineral aerosols e.

Walsh and Steidinger and Lenes and colleagues linked African dust to the development of extensive red tides in the Gulf of Mexico. Lenes and colleagues also showed that iron in African dust deposited by rain fuels blooms of Trichodesmium , an iron-limited cyanobacterium. The nitrogen-fixing Trichodesmium produces nutrients e. Recently, Bishop and colleagues documented an increase in carbon biomass in the North Pacific in response to iron influx from a strong Asian dust event. Some scientists question the importance of atmospheric dust as a source of iron in the ocean's photic zone, arguing that the most stable and abundant form of iron Fe [III] in dust is relatively insoluble in seawater and not readily available biologically.

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However, little is known of the chemistry occurring on dust particles of small volume and high surface area during atmospheric transport, and biogeochemical oceanographers are just beginning to understand the ocean's complex biogeochemical pathways. Dust from Africa and Asia is transported long distances in chemically and physically extreme environments where the small particles are exposed to high levels of solar radiation, multiple freeze—thaw cycles, relatively acidic conditions, and predominantly inorganic salts Jickells On its deposition to the ocean, the dust enters a radically different environment.

The thin surface layer of the ocean is characterized by concentrations of phytoplankton and zooplankton and by a steep concentration gradient of organic compounds and inorganic salts. It has been suggested that during atmospheric transport, photoreduction of Fe III , which is stable and relatively insoluble, produces Fe II , a biologically available and soluble species e.

Saydam and Senyuva propose that oxalate released by fungi in desert dust facilitates photoreduction of Fe III. Complexation of Fe II and III with organic ligands Butler or with clay minerals in the aerosol acts to stabilize the iron in a bioavailable form. On their deposition to the ocean surface layer, insoluble Fe III and some of the more soluble first-row transition metals form stable complexes with siderophores, low-molecular-weight organic ligands produced by some species of oceanic bacteria, facilitating uptake by microorganisms and phytoplankton Butler and references therein.

Young and colleagues suggested that the smaller the dust particle, the longer the residence time in the photic zone and therefore the greater the amount of iron that could be released and made available for phytoplankton and microbes. In a more direct mechanism, Fe III deposited in reducing environments e. Iron limitation is known to keep many microbial pathogens at low concentrations that directly counteract the expression of pathogenicity Weinberg Hayes and colleagues proposed that iron in dust may play a similar role in promoting microbial diseases on coral reefs.

Biomagnification and bioaccumulation processes add another layer of complexity in marine systems.

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Small dust particles 0. Zooplankton fecal pellets, singly or aggregated, could efficiently carry the bioconcentrated micronutrients and chemical contaminants to benthic organisms, larger zooplankton, or planktivores Syvitski and Lewis Doses of synthetic organic chemicals and micro- or macronutrients could affect reproduction or immune function of benthic organisms and contribute to maintaining the shift to seemingly alternative stable states e.

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Threshold effects may be involved. Exploration of the roles of atmospheric transport of dust in the biogeochemical cycles of marine and terrestrial ecosystems is in the earliest stages. Dust air masses transport more than mineral particles and nutrients. Sediment core studies conducted in the Atlantic Ocean off the West African coast reported the presence of freshwater diatoms and phytoliths in sediment cores and attributed their presence to African dust deposition e.

African desert locusts Schistocerca gregaria , up to 8 centimeters [cm] long have been carried in Saharan dust air masses across the tropical Atlantic and arrived alive on eastern Caribbean islands Ritchie and Pedgley If organisms as large as desert locusts have survived the multiday trip, it is likely that viable smaller organisms may be riding with the dust as well. Many well-known pathogenic bacteria, fungi, and viruses are transmitted through airborne transport e.

Most of the systemic fungal diseases, and viruses such as hantavirus, are typically transmitted in dust.

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The World Health Organization has identified drought and dust storm activity in the sub-Saharan region of Africa as causing regional outbreaks of meningococcal meningitis. Neisseria meningitidis , the infectious agent, causes approximately , cases and 50, deaths every year see www. Other disease outbreaks are associated with exposure to desert dust clouds in the Americas. One example is coccidioidomycosis in humans, caused by the fungus Coccidioides immitis. It is generally believed that most airborne pathogens are only transmitted over short distances.

Although the transmission of coccidioidomycosis or meningococcal meningitis has been documented through desert dust cloud exposure, it has only been shown to occur within the confines of a continent. Can desert dust clouds move viable pathogens around the planet, and is there a limit to the type of airborne pathogen that can be transported in this way? There are a surprising number of reports of long-range transport of plant pathogens.

Most of these infectious invaders are fungi, whose dispersal spores provide protection from ultraviolet UV light and other harsh environmental conditions. Culturing of air samples and species-specific detection are relatively new developments, so in most studies the fungal diseases were tracked based on the geography of the outbreaks, prevailing winds, and timing.

Examples include the potato blight fungus Phytophthora infestans , potato blackleg bacteria Erwinia carotovora and E. Less information is available concerning the aerosol transmission of animal pathogens. Several studies of dust collected from surfaces on poultry, swine, and dairy farms have shown that the dust contained fungi such as Aspergillus and Cladosporium Fiser et al. Windblown desert dust that carried fungi caused an outbreak of aspergillosis in desert locusts Venkatesh et al.

Meteorological data and molecular techniques were employed to determine the source of the pseudorabies virus cause of Aujeszky's disease in swine after outbreaks occurred in Denmark in December The evidence suggested the infections were a result of airborne transport of the viral pathogen from Germany Christensen et al. We are investigating the possibility that viable microbes are being transported across oceans in dust events.

Research to date has shown that the number of bacteria and fungi that can be cultured from air samples from the Virgin Islands is two- to threefold greater when African dust is in the atmosphere than when it is not Griffin et al. It is important to note that microbes that do not grow on one nutrient agar may grow on a different nutrient agar or source e. In short, the bacteria and fungi that we have cultured from atmospheric samples most likely represent only a small percentage of what is actually viable and capable of growth.

Furthermore, microbial ecology studies have shown that in environmental samples the total viral population present is usually 10 to times the total bacterial population Borsheim et al. Nonculturable microbes can be identified using whole genomic DNA extraction, followed by polymerase chain reaction PCR amplification, cloning, and sequencing of ribosomal RNA genes. The fungus known to cause sea fan disease in the tropical western Atlantic Aspergillus sydowii ; Smith et al. Since that time, the pathogenic strain of A. The pathogenicity of A.

Recently, Griffin and colleagues isolated numerous species of viable microorganisms—bacteria and fungi—from air samples taken in the Virgin Islands during dust events. The fungal isolate Cladosporium cladosporioides , which has been identified as a plant and human pathogen, is one of the most common species of fungi recovered from air samples.

Several of the bacteria isolated have previously been identified in marine environments Pseudomonas alcalophila , Paracoccus spp. Microorganisms can move from the marine environment to the atmosphere via physical surface activity that results in the formation of sea spray and sea foam e.

It is possible that dust clouds traversing marine environments serve as a vehicle for long-range transport of aerosolized marine microorganisms. Further sampling, midocean and in the Virgin Islands and Mali, is necessary before we can conclusively demonstrate what viable microorganisms are transported from Africa and in what concentrations see sidebar.

In a current study of a recent disease outbreak in Caribbean sea urchins Meoma ventricosa , two of the authors K. The sea urchin—associated bacterium proved to be genetically and morphologically identical to a bacterium isolated from a Virgin Islands dust event sample. Moreover, another bacterium isolated from a Sargassum species in San Salvador Bahamas was found to be genetically and morphologically identical to isolates from both sea urchins and Virgin Islands air samples during dust events.

Thus, it appears that some bacteria found in desert soils also occur in a viable state in the atmosphere over the Virgin Islands during African dust events and in the marine environment in the Western Atlantic. Whether these bacteria are actually transported long distances in dust events or can reproduce in the marine environment is unknown.


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Analysis of other marine and dust isolates reveals that other bacterial types remain viable in the atmosphere and marine environments as well. Bacteria isolated from M. It had been thought that exposure to UV light during long-range transport would inactivate any microbes. Dust in the upper altitudes of dust clouds attenuates UV light and could act as a UV screen for microbes at lower altitudes Herman et al.

Also, microorganisms may attach to and survive within cracks and crevices of inorganic dust particles, which would shield them from UV light. Preliminary findings indicate that UV resistance in microorganisms may play an important role in their survival during atmospheric transport. Coral diseases were first reported in the s e. Since that time, they have been observed on reefs worldwide Richardson and Aronson Presumably, diseases have always occurred on coral reefs, but they remained undetected until the s because of the low incidence of disease on reefs and the state of knowledge at the time.

The current levels of coral mortality are unprecedented. It is now accepted that coral diseases are an active and important factor in the continued degradation of coral reefs. Although up to 29 coral diseases are currently being monitored in various programs worldwide, the pathogens of only five diseases black band, aspergillosis, bacterial bleaching, white plague, and white pox have been identified. Four of these have been proved to be pathogens, following the procedures of fulfillment of Koch's postulates: aspergillosis Smith et al.

The fifth disease, black band, is caused by a pathogenic bacterial consortium, not a single pathogen. Reservoirs are known for only two coral diseases, black band disease and aspergillosis Richardson , Weir et al. Of the 10 coral diseases or disease-like states being monitored throughout the Caribbean and the Florida Keys Richardson , four are of particular interest in terms of defining a connection with African dust events: aspergillosis, black band disease, white pox, and white plague.

One of the few coral diseases to be characterized fully, aspergillosis is also one of the most common. This disease primarily affects two types of sea fans, Gorgonia ventalina figure 4 , left and G. As discussed above, it is caused by the common terrestrial fungus A.