. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 239 H fl> 15- N '-a '35 TJ I | i - - 10 20 Time (d) A • S. alterniflora o S. patens • D. spicata o p. australis <i • • ) 1 • 1 ' J 1 i w~\ i V [1 'I n ,-— ;o, £ (D | o O 30 40. R2 = p = % Figure 1. (A I Cliangfs m wrr i>/ Orchestia grillus/cfrfmg OTI year-old detritus over the course of the growth experiment. Data from the n\-o sampling sites were pooled. Locations of points along the \-a\i.\ were shivered to i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ECOLOGY AND POPULATION BIOLOGY 239 H fl> 15- N '-a '35 TJ I | i - - 10 20 Time (d) A • S. alterniflora o S. patens • D. spicata o p. australis <i • • ) 1 • 1 ' J 1 i w~\ i V [1 'I n ,-— ;o, £ (D | o O 30 40. R2 = p = % Figure 1. (A I Cliangfs m wrr i>/ Orchestia grillus/cfrfmg OTI year-old detritus over the course of the growth experiment. Data from the n\-o sampling sites were pooled. Locations of points along the \-a\i.\ were shivered to improve readability: Error bars represent confidence limits. (B) Averaged growth rates for O. grillus consuming \ear-old detritus species from both sites versus nitrogen content of the detritus. species with higher nitrogen content, such as D. spicata. resulted in significantly higher growth rates for this organism. Furthermore, the observed seaward encroachment of P. australis is slowly pushing out D. spicuui. the species that we found to have the highest nutritional quality (2). Given a continued shoreward mi- gration of S. altemiflora due to sea-level rise and the seaward spread off. australis. the overall food quality of marsh detritus for this invertebrate could decline. This suggests that changes in marsh grass species composition could affect higher trophic levels in this salt-marsh ecosystem. This research was supported by an NSF-REU fellowship through the Plum Island Ecosystem LTER to AMA. Literature Cited I Donnelly. and M. Bertness. 2001. Proc. Nail Acad. Sci. USA 98: 14218-142:3. 2. \\indham. U and R. Lathrop. 1999. Estuaries 22: 927-935. 3. Talley, T. and I,. A. Levin. 2001. Biol. Invasions 3: 51-68. 4. Lopez, G., J. S. Levinton. and L. B. Slobodkin. 1977. Oecologia 30: 111-127. Reference: Bi»l. Bull. 205: 239-241. (October 2003) © 2003 Marine Biological Laboratory Patterns of Sedimentation in a Salt Marsh-Dominated Estuary Jason R. Cavat
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