Valiela Marine Ecological Processes Pdf Viewer

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Is produced (Valiela 1995). CH 4 is released into the atmosphere through one of three processes: ebullition, diffusion or arrenchyma (Mitsch and Gosselink 2007). Ebullition is when gases rise to the surface trapped in bubbles, diffusion is when gas is dispersed through the water column, and arrenchyma is the transport of.

Abstract

Couplings between land use and marine food webs in tropical systems are poorly understood. We compared land–sea coupling in seven sites around Puerto Rico, differing in the degree of precipitation and urbanization, by measuring δ 13 C and δ 15 N in producers and consumers. δ 15 N values were influenced by human activity: the food web from sites near urbanized centers was on average 1‰ heavier in δ 15 N compared to undeveloped sites. This is most likely due to wastewater inputs from septic systems relatively near the shoreline. Changes in δ 13 C were best explained by differences in the degree of marine influence. Where terrestrial inputs from a major river dominated, δ 13 C values were lighter, whereas sites further from land and in locations exposed to oceanic currents had heavier δ 13 C values, characteristic of a marine source of dissolved organic carbon. We found no significant effect of precipitation on connectivity in spite of a twofold difference in annual average rainfall between the north and south coast. The results suggest there is some connectivity between land and sea in Puerto Rico, despite high rates of evaporation relative to precipitation.

Journal

Marine Environmental Research – Elsevier

Published: Apr 1, 2010

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Preview — Marine Ecological Processes by I. Valiela

Marine Ecological Processes is a modern review and synthesis of marine ecology that provides the reader - particularly the graduate student - with a lucid introduction to the intellectual concepts, approaches, and methods of this evolving discipline. Comprehensive in its coverage, this book focuses on the processes controlling marine ecosystems, communities, and population...more
Processes
Published August 10th 1995 by Springer
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