Recent improvements of water quality and biological indicators in Hillsborough Bay, a highly impacted subdivision of Tampa Bay, Florida, USA

Johansson, J.O. R.; Lewis, Robin R.

doi:10.1016/b978-0-444-89990-3.50103-6

Cited by 29 publications

(15 citation statements)

References 4 publications

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“…Excluding the outbreak of wasting disease in the North Atlantic during the 1930s (Rasmussen 1977), documented losses of most seagrass systems have been related to deteriorated water quality resulting from anthropogenically-increased loading of nutrients and suspended sediments into estuarine and coastal waters which reduced submarine light availability to the benthos (Orth & Moore 1983, Cambridge & McComb 1984, Johansson & Lewis 1992, Dennison et al 1993, Short & Wyllie-Echeverria 1996. Seagrass losses observed in this study, however, occurred despite a submarine light environment fully capable of supporting a healthy eelgrass population.…”

Section: Discussionmentioning

confidence: 64%

Top-down impact through a bottom-up mechanism. In situ effects of limpet grazing on growth, light requirements and survival of the eelgrass Zostera marina

Zimmerman¹,

Steller²,

Kohrs³

et al. 2001

Mar. Ecol. Prog. Ser.

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Temporal changes in abundance, size, productivity, resource allocation and light requirements of a subtidal eelgrass (Zostera marina L.) population were followed for 2 yr after the September 1993 appearance of a previously rare oval form of the commensal limpet Tectura depicta (Berry) in Monterey Bay, California, USA. By exclusively targeting the epidermis, limpet grazing impaired photosynthetic performance but left respiratory demand, meristematic growth and more than 90% of the leaf biomass intact. The resulting low P :R ratios of grazed plants raised the light requirements for the maintenance of positive carbon balance almost 2-fold relative to healthy ungrazed plants and prevented the summertime accumulation of internal carbon reserves. Shoot density in this once-continuously vegetated 30 ha meadow declined from more than 50 shoots m ). More than 50% of the continuously vegetated meadow was converted to bare sand despite ambient light availability and water temperatures that were favorable for growth of healthy, ungrazed plants. Plant size declined by 50% and internal sugar reserves declined more than 4-fold within 6 mo after the appearance of T. depicta. Plant losses were most extensive during winter, when internal carbon reserves were minimal. The dramatic decline in eelgrass vigor and abundance reported here, despite a physical environment that was favorable for healthy eelgrass survival, illustrates the amplification of top-down control by this relatively inconspicuous limpet through a feeding mechanism that specifically impairs photosynthesis, a bottom-up process.

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Section: Discussionmentioning

confidence: 64%

Top-down impact through a bottom-up mechanism. In situ effects of limpet grazing on growth, light requirements and survival of the eelgrass Zostera marina

Zimmerman¹,

Steller²,

Kohrs³

et al. 2001

Mar. Ecol. Prog. Ser.

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show abstract

“…During this time, Bay water quality deterioration contributed to significant decline in baywide seagrass coverage . Initially led by citizens, a call to action ensued in the 1970s-80s (Johansson and Lewis, 1992;Lewis et al, 1999;Lewis, 2012). After which advanced treatment and/or reuse of domestic wastewater effluent was required prompting an initial kick-start to the Bay's recovery.…”

Section: Introductionmentioning

confidence: 98%

Tampa Bay estuary: Monitoring long-term recovery through regional partnerships

Sherwood

Greening

Janicki³

et al. 2016

Regional Studies in Marine Science

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“…In addition, paleolimnological studies in Florida lakes have also shown that cyanobacterial and pico-chlorophytes proliferation increased recently and abruptly in response to eutrophication (RiedingerWhitmore et al, 2005). Both biomass, chlorophytes and cyanobacteria flourishing accompanied the increase in loadings of inorganic N, and total P (Johansson and Lewis, 1992) and were attributed to progressively increase in discharging of sewage and agricultural effluent.…”

Section: Trophic Development and Phytoplankton Responsementioning

confidence: 99%

A survey study on ashtoum El-Gamil park's water concerning phytoplankton populations

El-Karim

Abdelhamid

Mabrouk

et al. 2013

Egypt. J. of Aquatic Biolo. and Fish.

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Among the 19 water samples collected year round during (2010 -2011) from Ashtoum El-Gamil Park, 12 samples succeeded to cluster above similarity level of 60%. The samples of similarity less than 60% were mainly sampled during summer. Total phytoplankton diversity marginally changed between lake stations. The highest diversity of 3.1 was found at station No. 4 in winter where a minimum diversity of 1.14 was found at station No. 1 in spring. The dominant classes in Lake Manzala (Ashtoum El-Gamil Park) were chlorophytes, diatoms and cyanoprokaryotes. The three groups altogether constitute more than 95% and 85% of the total phytoplankton abundance and total number of taxa, respectively. Based on cell number, the chlorophytes ranked the first position of dominance with relative abundance of 84.23% and they exclusively dominated the phytoplankton communities year round. Regarding the species composition, chlorophytes dominated the phytoplankton species composition with percentage occurrence of 44% to the total number of recorded species. The phytoplankton abundance showed major peaks during spring at different stations except at station No. 2 where the highest abundance of 28716 cells x 10 5 l -1 was found, whereas the minor peaks were irregularly distributed between other seasons with the least abundance of 704 cells x 10 5 l -1 which was detected during winter at station No. 4. Generall, the total number of taxa per site showed no obvious pattern of variation. It is concluded that presence and biodiversity of phytoplankton are affected by locations and seasons, and the pollution is under the critical levels.

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Recent improvements of water quality and biological indicators in Hillsborough Bay, a highly impacted subdivision of Tampa Bay, Florida, USA

Cited by 29 publications

References 4 publications

Top-down impact through a bottom-up mechanism. In situ effects of limpet grazing on growth, light requirements and survival of the eelgrass Zostera marina

Top-down impact through a bottom-up mechanism. In situ effects of limpet grazing on growth, light requirements and survival of the eelgrass Zostera marina

Tampa Bay estuary: Monitoring long-term recovery through regional partnerships

A survey study on ashtoum El-Gamil park's water concerning phytoplankton populations

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