such as Spartina may produce 200-1000 gCm" , and in tropical waters 

 Turtle grass, Thalassi'a , may produce 500-1500 gCm"^ annually. The 

 productivity of mangrove swamps has not been well documented, but 

 appears to be 350-400 gCm"^. 



The report presents information on the seasonal pattern of growth of 

 Laminaria longi cruris , L_. digitata , and Agarum cribrosum ; seasonal 

 variations in photosynthesis and respiration in seaweeds; storage and 

 translocation in seaweeds; growth in Macrocystis pyrifera in southern 

 California; the overall strategies of seaweeds; and production strategies 

 of some other marine macrophytes such as Spartina . 



Much of the information is also presented graphically, as well as in 

 the text, and an extensive list of references is included. (B.W.) 



Keywords: productivity, grasses, algae, mangrove, macrophytes 



II-A-4 



Tailing, J.F. 1975, Primary production of aquatic plants--conclusions. 

 Pages 281-294 i_n J.P. Cooper, ed.. Photosynthesis and productivity in 

 different environments. Cambridge University Press, London. 



This is a summary chapter for the section on primary production in 

 aquatic ecosystems. It contains some useful comparative materials and 

 a bibliography. (J.B.) 



Keywords: primary production, aquatic ecosystems 



II-A-5 



De la Cruz, A. A. 1973. The role of tidal marshes in the productivity 



of coastal waters. Association of Southeastern Biologists Bulletin 



20(4):147-156. 



De la Cruz provides an up-to-date and comprehensive discussion of 

 the productivity of coastal marshes and the utilization of detrital 

 materials in the food chain. The article reviews the major conclusions 

 of previous research; enumerates the reasons for the productivity of 

 coastal waters; and discusses primary productivity, plant decomposition, 

 detritus transport, nutritive value of detritus, and consumption in 

 terms of the author's own studies in a marshland on the northwestern 

 side of Bay St. Louis, Mississippi. A number of tables are provided 

 that give comparative figures for primary production, decomposition 

 rate, caloric content, and elemental composition of marsh and estuarine 

 plants on the basis of the findings of previous studies. The article 



29 



