sediment-associated heavy metals and their uptake into organism tissues have 

 been found to be the exception rather than the rule. Research results suggest 

 that there is little or no correlation between the bulk sediment content of 

 heavy metals and the environmental impact. Oil and grease residues, like the 

 heavy metals, seem tightly bound to sediment particles and accumulation of these 

 residues by organisms is minimal. 



69. HOESE, H.D., "Effects of Higher than Normal Salinities on Salt Marshes," 

 Contributions in Marine Science, University of Texas, Austin, Tex., 

 Vol. 12, July 1967, pp. 249-261. 



Salt marshes exist in a variety of salinity conditions including: (a) 

 where salinity seldom falls below 30 parts per thousand, (b) where waters 

 may become fresh at times, and (c) where salinity may exceed 40 parts per 

 thousand. Most, however, exist in waters between about 10 to 30 parts per 

 thousand. Increasing salinity may move the salt-brackish-freshwater boundaries 

 landward as has occurred in Louisiana. 



Increase in salinity allows many high salinity organisms to invade land- 

 ward, which may cause immediate harm to fisheries. The effects of rising 

 salinities are unknown for all salt marsh animals and plants and may differ . 

 Also, as salinity rises there are changes in other important factors that vary 

 among salt marshes. There is little proof that primary productivity will 

 increase with rising salinity, but it may follow different channels. The U.S. 

 Atlantic and Gulf of Mexico salt marsh system is based on Spartina altemiflora 

 and would probably be destroyed if salinity approached 50 parts per thousand. 

 The effects of lower salinities are much less certain and require intensive 

 study. 



70. HOESE, H.D., "Fauna of the Aransas Pass Inlet, Texas: III Diel and 

 Seasonal Variations in Trawlable Organisms of the Adjacent Area," 

 The Texas Journal of Science ^ Vol. XX, No. 1, May 1968, pp. 33-60. 



This study had three objectives: (a) to study catch variations during a 

 24-hour period each season, (b) to compare these seasonal changes with day- 

 time monthly collections of invertebrates, and (c) to estimate the growth of 

 organisms taken in the bay. The first objective was undertaken to determine 

 the diel occurrence in relation to seasonal life stages and environmental 

 conditions. The second objective was undertaken to equate diel differences 

 with previous trawl collections made during the day so that more realistic 

 population measurements could be derived. Four 24-hour trawl samples consist- 

 ing of 10-minute trawls every hour were conducted on 20-21 October 1964, and 8-9 

 February, 29-30 April, and 18-19 August 1965 in the Aransas Bay. One 24-hour 

 trawl sample, consisting of a 10-minute trawl every 6 hours, was conducted at 

 6 and 9 fathoms in the Gulf of Mexico on 12-13 November 1965. Seasonal trawl 

 collections were made from February 1964 through January 1965 at 3, 6, 9, 12, 

 and 15 fathoms in the Gulf of Mexico and at the station in Aransas Bay that 

 was sampled for diel differences. 



71. HOHN, M.H., "The Use of Diatom Populations as a Measure of Water Quality 

 in Selected Areas of Galveston and Chocolate Bays, Texas," Publications of 

 the Institute of Marine Science, Vol. 6, University of Texas, Austin, Tex., 

 1959, pp. 206-212. 



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