geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Analysis of tidal marsh vegetation patterns in two Georgia estuaries using aerial photography and GIS


, : Analysis of tidal marsh vegetation patterns in two Georgia estuaries using aerial photography and GIS. Estuaries 27(4): 670-683, August

Aerial photographs and GIS analysis were used to map the distribution of tidal marsh vegetation along the salinity gradients of the estuaries of the Altamaha and Satilla Rivers in coastal Georgia. Vegetation maps were constructed from 1993 U.S. Geological Survey Digital Orthophoto Quarter Quads, 1:77,000-scale color infrared photographs taken in 1974 and 1:24,000-scale black and white photographs taken in 1953. Changes between years were identified using a GIS overlay analysis. Four vegetation classifications were identified and groundtruthed with field surveys: salt marsh (areas containing primarily Spartina alterniflora), brackish marsh (Spartina cynosuroides and S. alterniflora), Juncus (Juncus roemerianus), and fresh marsh (Zizania aquatica, Zizaniopsis miliacae, and others). There was no evidence for an upstream shift in marsh vegetation along the longitudinal axis of either estuary over the time frame of this analysis, which implies there has not been a long-term increase in salinity. Although the inland extent of each marsh zone was further upstream in the Satilla than the Altamaha, they corresponded to similar average high tide salinities in each estuary: areas classified as salt marsh occurred from the mouth up to where average high tide salinity in the water was approximately 15 psu; Juncus ranged from 21 to I psu; brackish marsh ranged from 15 to I psu; and fresh marsh was upstream of I psu. Approximately 63% of the 6,786 ha of tidal marsh vegetation mapped in the Altamaha and 75% of the 10,220 ha mapped in the Satilla remained the same in all 3 yr. Juncus was the dominant classification in the intermediate regions of both estuaries, and shifts between areas classified as Juncus and either brackish or salt marsh constituted the primary vegetation change between 1953 and 1993 (87% of the changes observed in the Altamaha and 95% of those in the Satilla). This analysis suggests that. the broad distribution of tidal marsh vegetation along these two estuaries is driven by salinity, but that at the local scale these are dynamic systems with a larger number of factors affecting the frequently changing borders of vegetation patches.

US$19.90

DOI: 10.1007/bf02907652


Other references

Eugene, A.R.; Masiak, J., 2017: A pharmacodynamic modelling and simulation study identifying gender differences of daily olanzapine dose and dopamine D2-receptor occupancy. Gender differences in treatment response rates for patients treated with antipsychotics are known. However, the literature lacks a pharmacodynamic model to allow for gender-based clinical trial simulations from modelling parameters for Olanzapine...

Dyar, M.Darby, 2012: Gender and geoscience specialization as a function of object and spatial visualization skills. Geological Society of America 486

Huntsman Mapila P.; Kampunzu A.B.; Vink B.; Ringrose S., 2005: Cryptic indicators of provenance from the geochemistry of the Okavango Delta sediments, Botswana. The siliciclastic sediments of the Okavango inland Delta of northwest Botswana have a modal composition of quartz arenites and result from a complex history, including transport by river and deposition in a nascent rift basin located in a desert e...

Connors, PG., 1981: Distribution and ecology of shorebirds in Alaska's coastal zone: a review of studies in the outer continental shelf environmental assessment program. Wader Study Group Bulletin, 48-51 No. 31

Burghardt, P.R.; Love, T.M.; Stohler, C.S.; Hodgkinson, C.; Shen, P-Hong.; Enoch, M-Anne.; Goldman, D.; Zubieta, J-Kar., 2013: Leptin regulates dopamine responses to sustained stress in humans. Neural systems that identify and respond to salient stimuli are critical for survival in a complex and changing environment. In addition, interindividual differences, including genetic variation and hormonal and metabolic status likely influence t...

Okuyama, E.Y.mazaki, M., 1984: Fumigatonin, a new meroterpenoid from Aspergillus fumigatus. The structure of fumigatonin, a new meroterpenoid isolated from IFM 4482 was elucidated by X-ray analysis.

Zúñiga Cisneros, M., 1967: Round table on the National Health Service sponsored by the Venezuelan Public Health Society. I. Justification for a single health service. Revista Venezolana de Sanidad Y Asistencia Social 32(1): 11-19

Mikoajewicz, M.; Filoda, G., 1997: Evaluation of biological effectiveness of dimethoate in the control of pests on medicinal plant plantations. The results of experiments conducted at the Research Institute of Medicinal Plants, Poznan, Poland, during 1990-95 are presented. Dimethoate (Bi 58 EC, Bi 58 Nowy, Danadim 400 EC and Rogor) pesticides were evaluated for effectiveness against Aceri...

Fyodorov G.; Bayadilov E. (Bayadilov Ye); Zhelnov V.P.; Akhmetov M.; Abakumov A.A., 1997: Uranium and environment in Kazakstan. IAEA-Tecdoc 961: 115-121

Nazirov, N.N., 1981: Radiation mutagenesis in cotton. The species, varieties and characters studied differed in their mutability, which also varied according to the stage of development at which irradiation was carried out. The highest frequency and widest range of mutations were obtained following i...