Amphipods of the deep Mississippi Canyon, northern Gulf of Mexico: ecology and bioaccumulation of organic contaminants

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dc.contributor.advisor Rowe , Gilbert T en_US
dc.contributor.committeeMember Wicksten , Mary K . en_US
dc.creator Soliman , Yousria Soliman en_US
dc.date.accessioned 2010 -01 -16T01 :40 :17Z
dc.date.accessioned 2014 -02 -19T19 :36 :12Z
dc.date.available 2010 -01 -15T00 :02 :27Z
dc.date.available 2014 -02 -19T19 :36 :12Z
dc.date.created 2007 -05 en_US
dc.date.issued 2009 -05 -15 en_US
dc.identifier.uri http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1356 en_US
dc.description.abstract In five summer cruises during the period 2000 -2004 , seventy -four box cores were collected from eleven locations from the Mississippi Canyon (480 - 2750m , northern Gulf of Mexico ) , and an adjacent transect (336 -2920 ) to understand the community structure and trophic function of amphipods and for measuring the bioaccumulation of polycyclic aromatic hydrocarbons , (PAHs ) . Amphipods were discovered to be an important component of the macrofauna of the Mississippi Canyon (40 % of the total faunal abundance ) . Seventy two species , belonging to nineteen families , were collected from the study area with 61 species from the canyon and only 38 species from the non -Canyon transect . The head of the canyon (480m ) was dominated by dense mats (15 ,880 ind /m2 ) of a new amphipod (Ampelisca mississippiana ) . The logarithm of the amphipod abundance decreased linearly with depth . The species diversity (H` ) exhibited a parabolic pattern with a maximum at 1100m . The differences in amphipod abundances and biodiversities were correlated with the variation in the amount of available organic matter . The depression in diversity in the canyon head is thought to be competitive exclusion resulting from the dominance by A .mississippiana , but the high species richness is presumed to be a function of the structural complexity of the canyon . Annual secondary production of A . mississippiana was 6 .93 g dry wt m -2 , based on size -frequency method and corresponding to an estimated univoltine generation from a regression model . The production /biomass ratio (P /B ) was 3 .11 . Production of this magnitude is comparable to shallow marine ampeliscids but are high for the depauperate northern Gulf of Mexico . The effect of the organic contaminants and the bioavailability to the amphipods was determined through measuring the bioaccumulation of the PAHs . The distribution of PAHs in sediments was different from the distribution in the organisms suggesting preferential uptake /depuration or uptake from pore or bottom waters . The average bioaccumulation factor (4 .36 ? 2 .55 ) and the biota sediment accumulation factor (0 .24 ?0 .13 ) for the total PAHs by the ampeliscids were within the range reported for other benthic invertebrates . The average bioaccumulation factors were highest for dibenzothiophenes (up to 132 ) and alkylated PAHs and lowest for parent high molecular weight PAHs . en_US
dc.format.medium electronic en_US
dc.format.mimetype application /pdf en_US
dc.language.iso en _US en_US
dc.subject Organic en_US
dc.title Amphipods of the deep Mississippi Canyon , northern Gulf of Mexico : ecology and bioaccumulation of organic contaminants en_US
dc.type Book en
dc.type.genre Electronic Dissertation en_US
dc.type.material text en_US
dc.format.digitalOrigin born digital en_US

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Amphipods of the deep Mississippi Canyon, northern Gulf of Mexico: ecology and bioaccumulation of organic contaminants. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1356 .

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