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GEOREF RECORD

Modern marine bioerosion by macroinvertebrates, northern Gulf of California

Ralph F. Stearley and A. A. Ekdale
Modern marine bioerosion by macroinvertebrates, northern Gulf of California
Palaios (October 1989) 4 (5): 453-467

Abstract

Calcareous rocks exposed in the intertidal zone of the northern Gulf of California, where the spring tide range exceeds 7 meters, are being significantly eroded by a diverse suite of endolithic invertebrates, including bivalves, sipunculans, and clionid sponges. Intertidul endoliths of two different environments near Puerto Penasco, Sonora, Mexico, were examined. The endolithic fauna of Station Beach, on an exposed coastline subject to annual and storm-related migration of sand bodies, is quite distinct from that of Cholla Bay, a large, protected muddy bay. Under conditions of variable sediment cover (Station Beach), endolithic communities display higher species diversity, greater species equitability, and lower population densities than those living under relatively static conditions (Cholla Bay). Typically, there are also differences in the orientations of boring openings to the sediment/rock sugace. Based on size-frequency determinations, endolith populations in the more dynamic environments at Station Beach appear to be less mature (in terms of age). These features can be useful in interpretating paleoenvironments. Endolithic organisms are major geomorphic agents in these intertidal environments. Where conditions permit, a complex biokarst is initiated. Bioerosion rates for sipunculans and bivalves averaged over the entire affected areas range up to 0.3 m of downward erosion per 1,000 years. These rates are at the same order of magnitude as those obtained by workers investigating bierosion in coral reefs and along sea clifls.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 4
Serial Issue: 5
Title: Modern marine bioerosion by macroinvertebrates, northern Gulf of California
Affiliation: Univ. Mich., Dep. Geol., Ann Arbor, MI, United States
Pages: 453-467
Published: 198910
Text Language: English
Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States
References: 55
Accession Number: 1990-033479
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N26°30'00" - N32°30'00", W115°04'60" - W108°30'00"
N22°45'00" - N32°00'00", W115°00'00" - W106°00'00"
Secondary Affiliation: Univ. Utah at Salt Lake City, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 1990
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