. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. # Nauplii/ m2 1200000 1000000 800000 600000 400000 200000 0 160000 140000 120000 # 100000 Nauplii/ soooo m3 eoooo 40000 20000 0 30000 25000 20000 # Animals/ isooo m3 -,- l: •••11. Nov-06 Jan-03 Mar-05 May-08 Jul-10 Aug-27 Collection Dates Nov-06 Jan-03 Mar-05 May-08 Jul-10 Aug-27 Collection Dates Figure 2. Seasonal trends of (A) resting egg concentrations in the sea bed, (B) numbers of nauplii emerging from sediments incubated in the laboratory, (C) nauplii concentrations in the water column, and (D) adult and copepodite con
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. # Nauplii/ m2 1200000 1000000 800000 600000 400000 200000 0 160000 140000 120000 # 100000 Nauplii/ soooo m3 eoooo 40000 20000 0 30000 25000 20000 # Animals/ isooo m3 -,- l: •••11. Nov-06 Jan-03 Mar-05 May-08 Jul-10 Aug-27 Collection Dates Nov-06 Jan-03 Mar-05 May-08 Jul-10 Aug-27 Collection Dates Figure 2. Seasonal trends of (A) resting egg concentrations in the sea bed, (B) numbers of nauplii emerging from sediments incubated in the laboratory, (C) nauplii concentrations in the water column, and (D) adult and copepodite concentrations in the Apalachicola estuary. Mean and standard deviation. adults and copepodites of A. tonsa did not differ signifi- cantly between the three regions of the system. The av- erage concentration of adults and copepodites of A. tonsa in the estuary varied seasonally, being moderately high ( X 103 m~3) in November, low ( X 103 nT3) in January, extremely low (13 m~3) in March, and then high ( to X 104irT3)inMay, July, and August (Fig. 2d). Discussion For most of the year, the average concentration of co- pepod eggs in the sea bed of the Apalachicola estuarine system was of the same order of magnitude (105 irT2) as that reported for Centropages hamatus in Alligator Har- bor, Florida (Marcus, 1989). These values for sub-tropical systems are equivalent in magnitude to the values reported for temperate bays and estuaries (, Kasahara el a!.. 1975; Uye 1983). In the present study, the emergence of large numbers of nauplii (average X X 105 m~2) from the sediments that were incubated in the lab- oratory at ambient field conditions indicated that large numbers of these eggs were viable. At such concentrations and levels of emergence, these eggs constitute a large po- tential source of naupliar recruits for the planktonic pop- ulation and a large potential source of prey items for larval fish and invertebrates. Because the eggs isolated from the
Size: 2167px × 1153px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
