The Northern Adriatic Ecosystem: Deep Time in a Shallow Sea

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Columbia University Press, 2007 - Broj stranica: 299
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The northern Adriatic Sea is transient, most recently flooded between 18,000 to 6,000 years ago following the last glacial maximum, and it will drain again with the onset of the next glacial period. Despite its youth, uniformly shallow depth, and flat sediment floor, it hosts a broad range of bottom-dwelling sea life ecologically resembling communities that have existed in the shallow sea since the Ordovician Period, some 500 million years ago.

The northern Adriatic is a natural laboratory in which to test hypotheses concerning the shift from the Paleozoic prevalence of stationary suspension-feeders living on the surface of the sediment and feeding from the overlying waters to, more recently, bottom-dwelling animals living dominantly in or actively seeking temporary refuge within the sediments of the sea floor, regardless of where they feed. Across the northern Adriatic Sea there is an ecological gradient from Paleozoic-style surface-dwelling communities in the east to "modern" communities living almost exclusively within the sediments in the west. Therefore, within the relatively small area of the northern Adriatic, there is an existing gradient similar to the profound ecological change from Paleozoic to more modern marine life.

During the early twentieth century, life at the bottom of the Adriatic was systematically sampled from the east to the west coasts, revealing the most common animals and their distribution. In this book Frank K. McKinney combines these findings with more recent, local studies to understand better the ecological structure of the Adriatic's floor. Specifically, he uses the predation, sediment textures and deposition rates, currents, and nutrients of northern Adriatic bottom communities to evaluate hypotheses concerning the conditions that drove surface-dwelling animals to seek long-term refuge within sea floor sediment.

Though the northern Adriatic has been well studied since the advent of the marine sciences, it is not widely known by paleontologists. With this volume, McKinney illuminates what this "living laboratory" can tell us about the evolution of multicellular life on Earth.

  

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Sadržaj

LongTerm Changes in Shallow Marine Life
1
Hypotheses About Causes of LongTerm Ecological Changes
15
Geography of the Northern Adriatic Sea
29
Summary
42
Origin of the Adriatic
44
Summary
59
Subsurface Circulation
79
Geochemical Budget of Nutrients
98
Benthos Across the Northern Adriatic
146
Eastern Benthic Assemblages
157
Bryozoans
185
Isolated Western Hard Substrata
191
General Patterns Across the Northern Adriatic
201
Summary
216
Correlation of Distributional Patterns with Environmental Factors
229
Implications for Turnover from Paleozoic to Modern Ecology
241

Benthic Hypoxia and Anoxia
115
Cyclicity of Pleistocene Adriatic Sedimentary Deposits
128
Narrow Eastern Belt of Sedimentation
140
La Tristezza tra Trieste e Termoli
250
Index
289
Autorska prava

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O autoru (2007)

Frank K. McKinney, Emeritus Professor of Geology at Appalachian State University, received his Ph.D. from the University of North Carolina. He is a highly-regrded paleontologist who studies evolution and ecology of marine invertebrates. He has held long-term research associate appointments at the Natural History Museum (London), American Museum of Natural History (New York), and the Field Museum of Chicago. With Jeremy Jackson he authored Bryozoan Evolution (Unwin Hyman and Chicago, 1989). He also wrote Exercises in Invertebrate Paleontology (Blackwell, 1989) and coedited, with Jackson and S. Lidgard, Evolutionary Patterns (Chicago, 2001).

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