Mianzan Hermes

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Mianzan
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Hermes
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Questioning the rise of gelatinous zooplankton in the world's oceans

2012-02 , Condon, Robert H. , Graham, William M. , Duarte, Carlos M. , Pitt, Kylie A. , Lucas, Cathy H. , Haddock, Steven H. D. , Sutherland, Kelly R. , Robinson, Kelly L. , Dawson, Michael N. , Decker, Mary Beth , Mills, Claudia E. , Purcell, Jennifer E. , Malej, Alenka , Mianzan, Hermes , Uye, Shin-Ichi , Gelcich, Stefan , Madin, Laurence P.

During the past several decades, high numbers of gelatinous Zooplankton species have been reported in many estuarine and coastal ecosystems. Coupled with media-driven public perception, a paradigm has evolved in which the global ocean ecosystems are thought to he heading toward being dominated by “nuisance” jellyfish. We question this current paradigm by presenting a broad overview of gelatinous Zooplankton in a historical context to develop the hypothesis that population changes reflect the human-mediated alteration of global ocean ecosystems. To this end, we synthesize information related to the evolutionary context of contemporary gelatinous Zooplankton blooms, the human frame of reference for changes in gelatinous Zooplankton populations, and whether sufficient data are available to have established the paradigm. We conclude that the current paradigm in which it is believed that there has been a global increase in gelatinous Zooplankton is unsubstantiated, and we develop a strategy for addressing the critical questions about long-term, human-related changes in the sea as they relate to gelatinous Zooplankton blooms.

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Linking human well-being and jellyfish : ecosystem services, impacts, and societal responses

2014-11 , Graham, William M. , Gelcich, Stefan , Robinson, Kelly L. , Duarte, Carlos M. , Brotz, Lucas , Purcell, Jennifer E. , Madin, Laurence P. , Mianzan, Hermes , Sutherland, Kelly R. , Uye, Shin-Ichi , Pitt, Kylie A. , Lucas, Cathy H. , Bogeberg, Molly , Brodeur, Richard D. , Condon, Robert H.

Jellyfish are usually perceived as harmful to humans and are seen as “pests”. This negative perception has hindered knowledge regarding their value in terms of ecosystem services. As humans increasingly modify and interact with coastal ecosystems, it is important to evaluate the benefits and costs of jellyfish, given that jellyfish bloom size, frequency, duration, and extent are apparently increasing in some regions of the world. Here we explore those benefits and costs as categorized by regulating, supporting, cultural, and provisioning ecosystem services. A geographical perspective of human vulnerability to jellyfish over four categories of human well-being (health care, food, energy, and freshwater production) is also discussed in the context of thresholds and trade-offs to enable social adaptation. Whereas beneficial services provided by jellyfish likely scale linearly with biomass (perhaps peaking at a saturation point), non-linear thresholds exist for negative impacts to ecosystem services. We suggest that costly adaptive strategies will outpace the beneficial services if jellyfish populations continue to increase in the future.

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Is global ocean sprawl a cause of jellyfish blooms?

2012-09-07 , Duarte, Carlos M. , Pitt, Kylie A. , Lucas, Cathy H. , Purcell, Jennifer E. , Uye, Shin-Ichi , Robinson, Kelly L. , Brotz, Lucas , Decker, Mary Beth , Sutherland, Kelly R. , Malej, Alenka , Madin, Laurence P. , Mianzan, Hermes , Gili, Josep-Maria , Fuentes, Veronica , Atienza, Dacha , Pages, Francesc , Breitburg, Denise L. , Malek, Jennafer , Graham, William M. , Condon, Robert H.

Jellyfish (Cnidaria, Scyphozoa) blooms appear to be increasing in both intensity and frequency in many coastal areas worldwide, due to multiple hypothesized anthropogenic stressors. Here, we propose that the proliferation of artificial structures – associated with (1) the exponential growth in shipping, aquaculture, and other coastal industries, and (2) coastal protection (collectively, “ocean sprawl”) – provides habitat for jellyfish polyps and may be an important driver of the global increase in jellyfish blooms. However, the habitat of the benthic polyps that commonly result in coastal jellyfish blooms has remained elusive, limiting our understanding of the drivers of these blooms. Support for the hypothesized role of ocean sprawl in promoting jellyfish blooms is provided by observations and experimental evidence demonstrating that jellyfish larvae settle in large numbers on artificial structures in coastal waters and develop into dense concentrations of jellyfish-producing polyps.