in Shark River Slough. Regression analysis was used to relate individual species catch 
rates for gray snapper, spotted seatrout, red drum and common snook to the principal 
components of inflow. Highly significant (P < 0.05) regression models were developed 
and verified for all species. Increased runoff in the winter led to decreased catches of 
snapper, seatrout and snook. Above average summer and fall runoff led to increased 
catches of red drum, seatrout, and snook but decreased catch of snapper. Management 
practices need to consider not only the volume of water but the timing of delivery to 
the estuary to ensure fishery yields in the future. 
1994 0 
Strong, A. M., R. J. Sawicki, and G. T. Bancroft (1994) Estimating white-crowned pigeon 
population size from flight-line counts. J. Wildl. Manage. . 58(1):156-62. 
[DATE OF SAMPLING UNKNOWN OR NOT APPLICABLE.] The white crowned pigeon 
(Columba leucocephala) is a threatened species in Florida, yet there are no population 
estimates nor are there methodologies available for estimating population size. During 
the 1991 nesting season we developed a nondisruptive technique for estimating the 
nesting population of white crowned pigeons in the upper Florida keys. Using radio 
telemetry and automatic cameras we determined that breeding males returned to 
nesting keys later in the morning than do nonbreeding birds (P = 0.001). We studied the 
relationship between number of incoming birds and number of nests on 14 keys by 
conducting total nest counts and flight-line counts during 0810 - 1300 (mean arrival 
time for breeding males ±2 SD). We examined 78 regression equations using all possible 
10-min increments of time intervals >90 min and found that the number of birds 
arriving during 0820 - 1010 was the best predictor of number of nests on a key (P < 
0.001). We counted incoming birds from 0820 - 1010 on 43 keys in Florida Bay, Card 
Sound, and Florida Straits. For each of the 43 keys we entered the number of incoming 
birds into a regression equation and estimated the breeding population to be 4,880 nests 
(95% Cl = 2,115 < 4,880 <_7,905 nests). We estimated an additional 175 nests at the 
remaining nesting areas for a total breeding population estimate of 5,055 nests. This 
technique should be applicable in other areas where white-crowned pigeons occur. 
1994 0 
Tedesco, L. P. (1994) Vertical fluxes resulting from bioirrigation: the significant effect of 
deep burrowing arthropods. Bull. Mar. Sci. . 54(3):1086. 
[ABSTRACT ONLY. DATE OF SAMPLING UNKNOWN OR NOT APPLICABLE.] Deep burrowing 
arthropods ( Callianassa, Alpheus, and Upogebia) are prevalent vertical advectors of 
sediment throughout the shallow marine bays, lagoons and the reef-tract of South 
Florida. Their thumb-sized open burrow complexes commonly extend more than a meter 
into the subsurface. During burrow excavation and feeding, these crustaceans expel 
suspension-sized sediment to the depositional interface. Expelled sediment is 
overwhelmingly less than 175 nm in settling diameter and represents grains swept up 
and out of the burrow by currents generated by the shrimp. Expelled sediment may be 
the finer-grained sediment from the original substrate in the case of deposit feeders or 
waste from suspension trapping during filter feeding. Large storms and hurricanes 
erode, resuspend and transport surficial sediments that infill open burrow complexes. 
Storm infilling from the surface is with a mixture of traction-bedload-sized grains and 
mud. Burrow excavation and feeding effectively transports deeply buried (> 1 m) 
sediments, including particulate and surface adsorbed pollutants, to the depositional 
interface while storm infilling transports surficial sediment deep into the subsurface. 
Initial calibration of rates of burrow excavation and infilling using 210 P b 
geochronologies in Biscayne Bay, demonstrate vertical particle advection rates 
sufficiently fast to recycle 15 - 25% of the upper I to 1.5 m of deposit over 100 yr 
time scales. Deep burrowing arthropods are present throughout Biscayne Bay, the reef 
367 
