Wetland hydrologic connections to downstream waters influence stream water quality. However, no systematic approach for characterizing this connectivity exists. Here using physical principles, we ...categorized conterminous US freshwater wetlands into four hydrologic connectivity classes based on stream contact and flowpath depth to the nearest stream: riparian, non-riparian shallow, non-riparian mid-depth and non-riparian deep. These classes were heterogeneously distributed over the conterminous United States; for example, riparian dominated the south-eastern and Gulf coasts, while non-riparian deep dominated the Upper Midwest and High Plains. Analysis of a national stream dataset indicated acidification and organic matter brownification increased with connectivity. Eutrophication and sedimentation decreased with wetland area but did not respond to connectivity. This classification advances our mechanistic understanding of wetland influences on water quality nationally and could be applied globally.
Land use, watershed processes, and coastal biodiversity are often intricately linked, yet land--sea interactions are usually ignored when selecting terrestrial and marine reserves with existing ...models. Such oversight increases the risk that reserves will fail to achieve their conservation objectives. The conceptual model underlying existing reserve selection models presumes each site is a closed ecological system, unaffected by inputs from elsewhere. As a short-term objective, we recommend extending land-conservation analyses to account for effects on marine biodiversity by considering linkages between ecosystems. This level of integration seems feasible and directly relevant to agencies and conservancies engaged in protecting coastal lands. We propose an approach that evaluates terrestrial sites based on whether they benefit or harm marine species or habitats. We then consider a hypothetical example involving estuarine nurseries. Whether this approach will produce more effective terrestrial reserves remains to be seen.
Thieme congratulates Dr. Eric M. Genden on being chosen by New York magazine for its prestigious 'Best Doctors 2018' list!
Head and Neck Cancer: Management and Reconstruction, 2nd Edition by Eric M. ...Genden masterfully blends two lauded Thieme books, Reconstruction of the Head and Neck, focusing on defect repair, and Head and Neck Cancer, a multidisciplinary, evidence-based approach to treatment. A significant increase in the incidence of oropharyngeal cancer in the U.S. and other countries, especially among men, is attributed to high-risk subtypes of the human papillomavirus (HPV). HPV associated tonsillar cancer and base of tongue cancer account for 90% of all oropharyngeal squamous cell carcinoma. Internationally renowned authors share the latest knowledge on HPV and other causes of head and neck cancers, from diagnosis to cutting-edge treatments.
Thirty richly illustrated chapters feature open and endoscopic ablative techniques for treating a full spectrum of carcinomas and associated defects of the buccal, mandible and composite, laryngeal, hypopharyngeal, and parotid. The book encompasses the nuances of each pathology, step-by-step procedural guidance, clinical pearls, and the latest reconstructive techniques such as 3-D. For each disease, the authors discuss management concepts followed by principles of reconstruction and functional rehabilitation. Special topics include patient surveillance, monoclonal antibodies and immunotherapy, microvascular reconstruction, and minimizing wound complications.
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