Deep‐sea coral record of human impact on watershed quality in the Mississippi River Basin

Prouty, Nancy G.; Roark, E. Brendan; Koenig, Alan E.; Demopoulos, Amanda W.J.; Batista, F. C.; Kocar, Benjamin D.; Selby, David; McCarthy, Matthew D.; Mienis, Furu; Ross, Steve W.

doi:10.1002/2013gb004754

Cited by 31 publications

(18 citation statements)

References 64 publications

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“…Previous studies have shown that high δ 15 N values are associated with the river water itself, particulate organic matter, entrained plankton, and shrimp associated with the plume (Wissel and Fry 2005;Dorado et al 2012). Additionally, increases in deepwater coral δ 15 N values have been attributed to increased nutrient loading of river waters, demonstrating both the extent of river influence and its effect on N isotopic compositions (Williams et al 2007;Prouty et al 2014). If this enriched N source was incorporated into the local food web at East Cameron, then consumers such as Red Snapper would be expected to show higher δ 15 N values relative to individuals from areas with a lesser riverine influence, which was observed in the present study.…”

Section: Discussionmentioning

confidence: 97%

Habitat Selection Important for Red Snapper Feeding Ecology in the Northwestern Gulf of Mexico

2017

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The present study compared Red Snapper Lutjanus campechanus feeding ecology among seasons, sizes, and natural reefs, and between natural and artificial reefs located on the Louisiana shelf edge. As low‐quality diets may hinder growth, reduce condition, and lead to poor reproductive output, information on diets for various habitat types occupied by Red Snapper is critical. This study utilized both stomach content analysis and nitrogen (δ15N) and carbon (δ13C) stable isotope analysis of muscle tissue. Fishes dominated Red Snapper diets at all sites, in all seasons, and generally for all size‐classes. A high biomass of zooplankton was consumed at the artificial reef area and during spring. The largest natural reef provided the widest diversity of prey items, and there was little overlap in prey species consumed between natural and artificial reef habitats. Higher δ15N and lower δ13C values were found for Red Snapper at the artificial reef area, and contrary to the diet results, distinct isotopic niches were found between natural reefs. Differences in Red Snapper isotopic niches between natural reefs indicate that individuals may remain in residence on a specific reef for an extended period. Red Snapper at natural reefs were found to feed on and above the reef, whereas feeding at artificial reefs predominantly occurred on the surrounding seafloor and up in the water column. The quality of habitats underlying reefs is important, as Red Snapper diets reflected the substrate at the occupied reefs. In the northwestern Gulf of Mexico, large, complex natural reefs may provide higher habitat quality for Red Snapper with respect to prey resources than artificial reefs located on mud substrates. Determining which habitats provide high‐quality prey resources for Red Snapper in the Gulf of Mexico may assist decisions on policies and regulations for habitat protection as well as decisions on the future placement of artificial reefs.

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Section: Discussionmentioning

confidence: 97%

Habitat Selection Important for Red Snapper Feeding Ecology in the Northwestern Gulf of Mexico

2017

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“…Macroalgae are known to accumulate Re and Os from seawater (Mas et al, ; Prouty et al, ; Racionero‐Gómez et al, ; Racionero‐Gómez et al, ; Rooney et al, ; Scadden, ; Yang, ), and recent studies have shown that macroalgae can act as a proxy for the 187 Os/ 188 Os of the seawater in which it lived (Racionero‐Gómez et al, ) and has been utilized to trace coastal inputs (Rooney et al, ). In addition, the 187 Re/ 188 Os of macroalgae has provided important insights into the incorporation of Re and Os into organic matter and sedimentary material (Racionero‐Gómez et al, ; Racionero‐Gómez et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the 187 Re/ 188 Os of macroalgae has provided important insights into the incorporation of Re and Os into organic matter and sedimentary material (Racionero‐Gómez et al, ; Racionero‐Gómez et al, ). However, the sources from which Re and Os are taken up, the influence of tidal mixing on the 187 Os/ 188 Os and 187 Re/ 188 Os of macroalgae and the cause of exceptionally high Re abundance and thus extremely high 187 Re/ 188 Os compositions in macroalgae are not fully understood (Mas et al, ; Prouty et al, ; Racionero‐Gómez et al, ; Racionero‐Gómez et al, ; Rooney et al, ; Scadden, ; Yang, ).…”

Section: Introductionmentioning

confidence: 99%

Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland

et al. 2018

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This study presents rhenium (Re) and osmium (Os) elemental and isotope data for macroalgae, dissolved load, and bed load from Icelandic coastal and/or river waters, an environment adjacent to predominantly basaltic terrains, ranging in age from historic to~12 Ma. Both the Re (0.1 to 88.4 ppb) and Os (3.3 to 254.5 ppt) abundance in macroalgae are shown to be primarily controlled by uptake from the dissolved load of local seawater and are largely dependent on the relative influence of local freshwater inputs. Incorporation of Re and Os into macroalgae appears to be complicated by additional Re and Os uptake from the bed load. The 187 Os/ 188 Os (0.16 to 0.99) composition of macroalgae is highly variable and is explained in terms of an unradiogenic 187 Os/ 188 Os contribution from rivers draining younger basaltic catchments that have undergone congruent weathering (and/or hydrothermal input) and a radiogenic 187 Os/ 188 Os contribution from two distinct sources: rivers draining older catchments that have undergone incongruent weathering of radiogenic primary basaltic minerals and North Atlantic seawater. The 187 Re/ 188 Os composition (~65 to 40,320) of macroalgae traces that of water, with higher values associated with higher salinity waters, but far exceeds the 187 Re/ 188 Os of water due to the preferential uptake of Re over Os by macroalgae in areas of high dissolved and/or bed load Re abundances. This study substantiates the utility of macroalgae as a proxy for the long-term (months to years) average 187 Os/ 188 Os composition of seawater, which holds the potential to elucidate a range of Earth system and anthropogenic processes.Macroalgae are known to accumulate Re and Os from seawater (Mas et al., 2005;Prouty et al., 2014;Racionero-Gómez et al., 2016;Racionero-Gómez et al., 2017;Rooney et al., 2016;Scadden, 1969;Yang, 1991), and recent studies have shown that macroalgae can act as a proxy for the 187 Os/ 188 Os of the seawater in which it lived SPROSON ET AL. 2791

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“…This trophic position calculated for the Muricella coral was higher than that calculated for deep‐sea black corals from the Gulf of Mexico at 300‐m depth of ∼2 determined using Glu‐Phe Eq. (Prouty et al ) but less than that reported for the gold coral Kulamanamana haumeaae specimens from the Island of O'ahu in the Hawaiian Islands at 450‐m depth with an averaged calculated trophic position of 3.0 using Glu‐Phe Eq. and .7 using Eq.…”

Section: Discussionmentioning

confidence: 88%

“…In the Hawaiian K. haumeaae coral and the NW Atlantic P. resedaeformis coral, δ 15 N gly is elevated relative to δ 15 N Phe yet still follows the same trend trends over the lifespan of the corals analyzed (Sherwood et al ). In contrast in the deep‐sea black corals, δ 15 N Phe and δ 15 N gly are the same (Prouty et al ). Thus, the enrichment of δ 15 N gly relative to δ 15 N Phe may reflect either regional nitrogen dynamics or coral‐taxa variability.…”

Section: Discussionmentioning

confidence: 99%

Consistency in coral skeletal amino acid composition offshore of Palau in the western Pacific warm pool indicates no impact of decadal variability in nitricline depth on primary productivity

Williams

Thibodeau

Chikaraishi

et al. 2016

Limnology & Oceanography

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The depth of the thermocline and associated nitricline in the western Pacific warm pool (WPWP) vary over time in response to changes in larger ocean‐atmosphere climate patterns. A shoaling of the nitricline in the WPWP brings nitrate‐rich seawater ( NO3− > 4 μmol kg−1) above the base of the euphotic zone, stimulating primary productivity. Here, we test if decadal variability in the nitricline depth is driving changes in regional primary productivity and source nitrate dynamics. We use the nitrogen isotopic composition (δ15N) of amino acids in the skeleton of a proteinaceous coral collected from the base of the euphotic zone in the WPWP. In proteinaceous corals, as in most organic life, the δ15N of phenylalanine matches that of the ambient nitrate while the δ15N of trophic amino acids reflect subsequent trophic transfer of the nitrogen prior to incorporation into the coral's food, suspended particulate organic matter. Consistency of the trophic position of the coral calculated from the δ15N composition of the coral skeletal amino acids over its 56 yr lifespan suggest that decadal variability in nitricline depth and subsequent shifts in nitrate availability to the euphotic zone have not impacted primary productivity offshore of Palau in the WPWP. This is important when considering the current external forcing of Pacific Ocean climate patterns and the resulting impacts on the global carbon cycle in the Palau region of the WPWP.

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Deep‐sea coral record of human impact on watershed quality in the Mississippi River Basin

Cited by 31 publications

References 64 publications

Habitat Selection Important for Red Snapper Feeding Ecology in the Northwestern Gulf of Mexico

Habitat Selection Important for Red Snapper Feeding Ecology in the Northwestern Gulf of Mexico

Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland

Consistency in coral skeletal amino acid composition offshore of Palau in the western Pacific warm pool indicates no impact of decadal variability in nitricline depth on primary productivity

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