Delineation of marsh types from Corpus Christi Bay, Texas, to Perdido Bay, Alabama, in 2010

Enwright, Nicholas M.; Hartley, Stephen B.; Couvillion, Brady R.; Brasher, Michael G.; Visser, Jenneke M.; Mitchell, M.; Ballard, Bart M.; Parr, Mark W.; Wilson, Barry C.

doi:10.3133/sim3336

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…First, both sites needed to be representative of similar marsh types in Louisiana. The coastal zone of Louisiana has approximately 2144 km 2 of brackish marsh and approximately 2837 km 2 of freshwater marsh [ Enwright et al ., ], and both sites have vegetation assemblages and hydrological signatures consistent with these wetland types. Many brackish marshes in Louisiana dominated by Spartina patens (Aiton) Muhl.…”

Section: Methodsmentioning

confidence: 91%

“…We thank Brian Bergamaschi, Ankur Desai, and three anonymous referees for providing excellent reviews of previous manuscript drafts, as well as Brady Couvillion for extracting Louisiana‐specific marsh area estimates from Enwright et al . []. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.…”

Section: Acknowledgmentsmentioning

confidence: 99%

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Component greenhouse gas fluxes and radiative balance from two deltaic marshes in Louisiana: Pairing chamber techniques and eddy covariance

Krauss

Holm²,

Perez³

et al. 2016

JGR Biogeosciences

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Neubauer, Scott C.; and Raynie, Richard C., "Component greenhouse gas fluxes and radiative balance from two deltaic marshes in Louisiana: Pairing chamber techniques and eddy covariance" (2016 Abstract Coastal marshes take up atmospheric CO 2 while emitting CO 2 , CH 4 , and N 2 O. This ability to sequester carbon (C) is much greater for wetlands on a per area basis than from most ecosystems, facilitating scientific, political, and economic interest in their value as greenhouse gas sinks. However, the greenhouse gas balance of Gulf of Mexico wetlands is particularly understudied. We describe the net ecosystem exchange (NEE c ) of CO 2 and CH 4 using eddy covariance (EC) in comparison with fluxes of CO 2 , CH 4 , and N 2 O using chambers from brackish and freshwater marshes in Louisiana, USA. From EC, we found that 182 g C m À2 yr À1 was lost through NEE c from the brackish marsh. Of this, 11 g C m À2 yr À1 resulted from net CH 4 emissions and the remaining 171 g C m À2 yr À1 resulted from net CO 2 emissions. In contrast, À290 g C m 2 yr À1 was taken up through NEE c by the freshwater marsh, with 47 g C m À2 yr À1 emitted as CH 4 and À337 g C m À2 yr À1 taken up as CO 2 . From chambers, we discovered that neither site had large fluxes of N 2 O. Sustained-flux greenhouse gas accounting metrics indicated that both marshes had a positive (warming) radiative balance, with the brackish marsh having a substantially greater warming effect than the freshwater marsh. That net respiratory emissions of CO 2 and CH 4 as estimated through chamber techniques were 2-4 times different from emissions estimated through EC requires additional understanding of the artifacts created by different spatial and temporal sampling footprints between techniques.

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Section: Methodsmentioning

confidence: 91%

Section: Acknowledgmentsmentioning

confidence: 99%

Component greenhouse gas fluxes and radiative balance from two deltaic marshes in Louisiana: Pairing chamber techniques and eddy covariance

Krauss

Holm²,

Perez³

et al. 2016

JGR Biogeosciences

View full text Add to dashboard Cite

show abstract

“…To characterize habitat covariates at the scale of the study site, we used a United States Geological Survey raster file (Enwright et al ) in ArcGIS to estimate percent cover of intermediate‐brackish marsh (intermediate marsh; salinity = 3.4–8.3 ppt) and open water at each study site. We used intermediate‐brackish marsh cover because gulf cordgrass and saltmeadow cordgrass dominate these marshes (Enwright et al ), and preliminary observations showed most black rail detections were in this marsh type. We used open water as a proxy for discontinuity in habitat at the site level.…”

Section: Methodsmentioning

confidence: 99%

Coastal Texas black rail population states and survey effort

et al. 2018

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Eastern black rails (Laterallus jamaicensis jamaicensis) are of conservation concern. These birds vocalize infrequently and inhabit dense vegetation, making them difficult to detect. We conducted the first large-scale study of black rail occupancy and abundance in Texas, USA. We conducted point count surveys that were 6-minute call-playback broadcasts and detected rails acoustically. We fit 19 occupancy and 19 abundance models while accounting for imperfect detection. We used the top occupancy model to estimate the required survey effort to precisely estimate black rail occupancy with and without detection correction methods. We found that detection increased with moon phase but decreased with wind speed and ambient noise. Occupancy and abundance increased with cordgrass (Spartina spp.) and intermediate marsh cover. Estimates of mean occupancy (0.27 and 0.26) and abundance (1.08 and 1.00 rails/point) were similar between 2015 and 2016. Estimated survey efforts under mean (wind ¼ 6-10 km/hr, lunar phase ¼ half-moon) and optimal (wind ¼ 0-5 km/hr, lunar phase ¼ full moon) environmental conditions were less for detection correction methods than for non-correction methods. We also concluded that efforts to predict black rail presence from na€ ıve occupancy estimates are impractical. Managers and researchers who wish to monitor black rails populations should use detection correction techniques when estimating occupancy and abundance. Ó

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Surface Elevation Change Dynamics in Coastal Marshes Along the Northwestern Gulf of Mexico: Anticipating Effects of Rising Sea-Level and Intensifying Hurricanes

et al. 2022

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Delineation of marsh types from Corpus Christi Bay, Texas, to Perdido Bay, Alabama, in 2010

Abstract: Coastal zone managers and researchers often require detailed information regarding emergent marsh vegetation types (that is, fresh, intermediate, brackish, and saline) for modeling habitat capacities and needs of marsh dependent taxa (such as waterfowl and alligator).

Cited by 6 publications

References 4 publications

Component greenhouse gas fluxes and radiative balance from two deltaic marshes in Louisiana: Pairing chamber techniques and eddy covariance

Component greenhouse gas fluxes and radiative balance from two deltaic marshes in Louisiana: Pairing chamber techniques and eddy covariance

Coastal Texas black rail population states and survey effort

Surface Elevation Change Dynamics in Coastal Marshes Along the Northwestern Gulf of Mexico: Anticipating Effects of Rising Sea-Level and Intensifying Hurricanes

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