Effect of seasonal hypoxia on the benthic foraminiferal community of the Louisiana inner continental shelf. The 20th century record

被引:60
作者
Platon, E
Sen Gupta, BK
Rabalais, NN
Turner, RE
机构
[1] Univ Utah, Energy & Geosci Inst, Salt Lake City, UT 84108 USA
[2] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA
[3] Louisiana Univ Marine Consortium, Chauvin, LA 70344 USA
[4] Louisiana State Univ, Coastal Ecol Inst, Baton Rouge, LA 70803 USA
[5] Louisiana State Univ, Dept Oceanol & Coastal Sci, Baton Rouge, LA 70803 USA
关键词
benthic foraminifera; hypoxia; benthic ecology; Louisiana continental shelf; Gulf of Mexico;
D O I
10.1016/j.marmicro.2004.12.004
中图分类号
Q91 [古生物学];
学科分类号
0709 ; 070903 ;
摘要
A species census in sediment core samples reveals significant changes in the composition of the Louisiana-shelf benthic foraminiferal community in the past century; these changes can be explained by an increase in the severity of seasonal hypoxia in bottom waters. Agglutinated and porcelaneous orders living in water depths less than 60 m suffered a noticeable decline during this time. In particular, the genus Quinqueloculina was severely affected by the progression of hypoxia, and nearly disappeared from parts of the study area. In contrast, several hyaline taxa, especially Nonionella basiloba, Buliminella morgani, and Epistominella vitrea, tolerated the progressive oxygen depletion well. Results of cluster and principal components analyses of the foraminiferal assemblage data match the observed species distribution trends and indicate that seasonal hypoxia on the Louisiana shelf, related to eutrophication and water stratification, worsened in the past century, even near the outer edge of the present-day zone of spring and summer oxygen depletion. The temporal trends in the foraminiferal record correspond to that of fertilizer use in the U.S. and nitrogen loading in the Mississippi River, suggesting that the anthropogenic factor has been particularly strong in the development of coastal hypoxia since the early 1940s. (C) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:263 / 283
页数:21
相关论文
共 21 条
[1]  
[Anonymous], ESTUARINE SCI SYNTHE
[2]  
Bernhard JM, 1999, MODERN FORAMINIFERA, P201
[3]   Benthic foraminifera from the NECOP study area impacted by the Mississippi River plume and seasonal hypoxia [J].
Blackwelder, P ;
Hood, T ;
AlvarezZarikian, C ;
Nelsen, TA ;
McKee, B .
QUATERNARY INTERNATIONAL, 1996, 31 :19-36
[4]   TIME-BASED CORRELATION OF BIOGENIC, LITHOGENIC AND AUTHIGENIC SEDIMENT COMPONENTS WITH ANTHROPOGENIC INPUTS IN THE GULF-OF-MEXICO - NECOP STUDY AREA [J].
NELSEN, TA ;
BLACKWELDER, P ;
HOOD, T ;
MCKEE, B ;
ROMER, N ;
ALVAREZZARIKIAN, C ;
METZ, S .
ESTUARIES, 1994, 17 (04) :873-885
[5]   USE OF PB-210 GEOCHRONOLOGY AS A SEDIMENTOLOGICAL TOOL - APPLICATION TO THE WASHINGTON CONTINENTAL-SHELF [J].
NITTROUER, CA ;
STERNBERG, RW ;
CARPENTER, R ;
BENNETT, JT .
MARINE GEOLOGY, 1979, 31 (3-4) :297-316
[6]  
Platon E, 2001, COAST EST S, V58, P147
[7]   Nutrient changes in the Mississippi River and system responses on the adjacent continental shelf [J].
Rabalais, NN ;
Turner, RE ;
Justic, D ;
Dortch, Q ;
Wiseman, WJ ;
SenGupta, BK .
ESTUARIES, 1996, 19 (2B) :386-407
[8]   COMPARISON OF CONTINUOUS RECORDS OF NEAR-BOTTOM DISSOLVED-OXYGEN FROM THE HYPOXIA ZONE ALONG THE LOUISIANA COAST [J].
RABALAIS, NN ;
WISEMAN, WJ ;
TURNER, RE .
ESTUARIES, 1994, 17 (04) :850-861
[9]  
Rabalais NN, 2001, COAST EST S, V58, P1
[10]  
RABALAIS NN, 1991, GEOL SOC SPEC PUBL, P35