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Christopher R. Kelble Peter B. Ortner Gary L. Hitchcock Michael J. Dagg Joseph N. Boyer 《Estuaries and Coasts》2010,33(3):723-737
Quantifying the relationship between mesozooplankton and water quality parameters identifies the factors that structure the
mesozooplankton community and can be used to generate hypotheses regarding the mechanisms that control the mesozooplankton
population and potentially the trophic network. To investigate this relationship, mesozooplankton and water quality data were
collected in Florida Bay from 1994 to 2004. Three key characteristics were found in the mesozooplankton community structure:
(1) there are significant differences between the four sub-regions of Florida Bay; (2) there is a break in May of 1997 with
significant differences before and after this date; and (3) there is a positive correlation between mesozooplankton abundance
and salinity. The latter two characteristics are closely correlated with predator abundance, indicating the importance of
top-down control. Hypersaline periods appear to provide a refuge from predators, allowing mesozooplankton to increase in abundance
despite the increased physiological stress. 相似文献
2.
Jia-Zhong Zhang Christopher R. Kelble Charles J. Fischer Lloyd Moore 《Estuarine, Coastal and Shelf Science》2009
Water quality surveys conducted in Biscayne Bay, Florida, indicated enhanced nutrient input coupled with increased runoff as a result of precipitation associated with Hurricane Katrina. Nutrient concentrations before Katrina ranged from 0.06–24.2 μM (mean 3.3 μM) for nitrate and 0.01–0.18 μM (mean 0.1 μM) for soluble reactive phosphate. Five days after Katrina, nitrate concentrations ranged from 0.87–80.0 μM (mean 17.0 μM), with a bay-wide mean increase of 5.2-fold over pre-hurricane levels. Soluble reactive phosphate concentrations ranged from 0.07–0.62 μM (mean 0.2 μM), with a bay-wide mean increase of 2-fold over pre-hurricane levels. The maximum concentrations for both nitrate and soluble reactive phosphate were found at a water quality monitoring station near the mouth of Mowry Canal, which drains an agricultural area in the southern Biscayne Bay watershed near Homestead, Florida. At this station, nitrate and soluble reactive phosphate concentrations increased 7- and 10-fold, respectively. Storm-induced fertilizer runoff from this agricultural area caused a bay-wide increase in nutrient concentrations after Hurricane Katrina. Nutrient concentrations in the bay returned to pre-hurricane levels within three months after Hurricane Katrina, showing the resiliency of the Biscayne Bay ecosystem. 相似文献
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Alarcon Vladimir J. Linhoss Anna C. Kelble Christopher R. Mickle Paul F. Sanchez-Banda Gonzalo F. Mardonez-Meza Fernando E. Bishop Joseph Ashby Steven L. 《Natural Hazards》2022,111(3):2933-2962
Natural Hazards - Southeast Florida (SF) is among the most vulnerable regions to sea-level rise in the United States of America. The consequences associated with sea-level rise (SLR) are already... 相似文献
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Christopher R. Kelble Peter B. Ortner Gary L. Hitchcock Joseph N. Boyer 《Estuaries and Coasts》2005,28(4):560-571
Light attenuation in marine ecosystems can limit primary production and determine the species composition and abundance of
primary producers. In Florida Bay, the importance of understanding the present light environment has heightened as major upstream
water management restoration projects have been proposed and some are already being implemented. We analyzed a 2-yr (2001–2003)
data set of the light attenuation coefficient (Kt) and its principal components (water, chromophoric dissolved organic matter [CDOM], tripton, phytoplankton) obtained at 40
stations within Florida Bay, calibrated synoptic underway data to produce high spatial resolution maps, examined the potential
for light limitation, and quantified the individual effect of each component upon light attenuation. Tripton was the dominant
component controlling light attenuation throughout Florida Bay, whereas the contribution of chlorophylla and CDOM to Kt was much smaller in all regions of Florida Bay. It was possible to accurately estimate the light attenuation coefficient
from component concentrations, using either a mechanistic or a statistical model with root mean square errors of 0.252 or
0.193 m−1, respectively. Compared to other estuaries, Florida Bay had the lowest overall Kt and the greatest relative contribution from tripton. Comparing the recent data to a study of Florida Bay’s light environment
conducted in 1993–1994, we found that overall water clarity in the Bay increased significantly, indicated by a nearly 3-fold
decrease in Kv as a result of lower tripton concentrations, although the percent contribution of each of the components to Kt is unchanged. Only the northwest corner of Florida Bay, an area comprised of approximately 8% of the Bay’s total area, was
found on average to have sufficient light attenuation to limit the growth of seagrasses. This is much less extensive than
in 1993–1994, when seagrass growth was potentially limited by light at over 50% of the stations sampled. 相似文献
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