Effects of ultraviolet-B radiation and nutrient enrichment on the productivity of benthic microalgae in shallow coastal lagoons of the North Central Gulf of Mexico

Cebrián, Just; Corcoran, Alina A.; Stutes, Adrienne L.; Stutes, Jason P.; Pennock, Jonathan

doi:10.1016/j.jembe.2009.02.009

Cited by 10 publications

(7 citation statements)

References 63 publications

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“…That hypothesis has been confirmed in some eutrophic coastal systems (e.g. Hillebrand & Kahlert 2002, Cebrian et al 2009, and it also seems to be the case at the relatively deeper reaches (>0.5m) of the Weeks Bay estuary. Weeks Bay receives high nutrient loads from farms and crop fields through groundwater and discharge from the Fish and Magnolia Rivers (Pennock et al 2001, Lehrter 2006).…”

mentioning

confidence: 55%

“…within a few days since nutrient addition) responses of sediment microalgae to fertilization given poor ambient nutrient availability and adequate levels of light and temperature (e.g. Downing et al 1999, Wulff et al 2000, Cebrian et al 2009, but our sediments appear to be saturated in nutrients for microalgal growth. However, prolonged nutrient dosage in our locations could certainly have indirect impacts on sediment microalgae through, for instance, changes in population structure and/or stimulation of phytoplankton growth and subsequent competition for light and nutrients (Hillebrand et al 2000, Hillebrand & Sommer 2000b, Cloern 2001.…”

Section: Discussionmentioning

confidence: 85%

“…Past experiments have shown that nutrient enrichment leads to higher benthic microalgal chlorophyll-a content in some instances (Hillebrand & Sommer 1997, 2000a, Lever &Valiela 2005, Cebrian et al 2009, but not in others (Hillebrand & Kahlert 2002, Stutes et al 2006, Cebrian et al 2009. Potential reasons as to why nutrient addition may not result in increased sediment chlorophyll-a content include severe light limitation of photosynthesis (Barranguet et al 1998, Meyercordt & Meyer-Reil 1999, ambient nutrient concentrations in the sediment that are saturating for growth/ 2.0 ± 0.4 0.3 ± 0.3 4.5 ± 1.1 5.2 ± 1.1 no data no data 9.8 ± 2.3 7.5 ± 1.3 n = 4 n = 4 n = 6 n = 6 n = 6 n = 6 Reserve 0.5 ± 0.2 0.5 ± 0.2 14.0 ± 2.7 7.0 ± 4.0 9.0 ± 3.1 10.7 ± 3.4 3.7 ± 1.2 5.8 ± 2.3 n = 6 n = 6 n = 5 n = 5 n = 4 n = 6 n = 6 n = 6 photosynthesis (Hillebrand & Kahlert 2002, Stutes et al 2006, and loss due to horizontal advection and/or grazing (Blanchard et al 2001, Cebrian 2004.…”

Section: Discussionmentioning

confidence: 99%

“…Under low ambient nutrient availability and favorable conditions of light, salinity and temperature, enhanced nutrient availability may lead to increased sediment microalgal biomass (e.g. Darley et al 1981, Wulff et al 2000, Cebrian et al 2009. However, widespread transformation of coastal watersheds by humans is increasing the delivery of nutrients into bays and estuaries in many parts of the world (Lotze et al 2006, Orth et al 2006.…”

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confidence: 99%

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Effects of short-term sediment nutrient enrichment and grazer <i>(Neritina reclivata)</i> removal on sediment microalgae in a shallow eutrophic estuary (Alabama, USA)

Cebrián

Stutes

Phipps

et al. 2012

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The olive snail (Neritina reclivata) is ubiquitous in tropical and subtropical systems of the Gulf of Mexico, however its impacts on sediment microalgae have been little studied. Many coastal systems around the world are being eutrophied due to human activities, and seemingly they will continue to be eutrophied to a further extent in the future. Exploring the single and combined impacts of further nutrient enrichment and grazing by the olive snail on sediment microalgae in such eutrophic systems is an important question for our understanding and management of these systems. Here we examine the effects of short-term nutrient enrichment and grazing by the olive snail N. reclivata on sediment microalgal biomass and composition in a shallow eutrophic estuary (Weeks Bay, Alabama, USA) of the Northern Gulf of Mexico. For this, we performed a series of factorial experiments adding or not nutrients and removing or not the snail, for a total of four treatments in each experiment: ambient grazing, ambient nutrients; ambient grazing, increased nutrients; no grazing, ambient nutrients; and no grazing, increased nutrients. We did not find any significant impact of nutrient addition in any of the eight short-term (i.e. four days) experiments carried out. Impacts by the snail were minor; we only found a decrease in biomass due to snail grazing in one of the eight experiments, and no impacts on microalgal (i.e. diatom) composition. High ambient nutrient concentrations in the sediment porewater and low snail abundances on the sediment could explain these findings. Our results suggest that ephemeral, short-term nutrient pulses into eutrophic coastal systems of the Northern Gulf of Mexico, such as Weeks Bay (Alabama, USA), should not greatly affect the abundance of sediment microalgae, even though those pulses occur in well-lit areas. The results further suggest the snail N. reclivata is not a major control of sediment microalgal populations in the subtidal sedimentary areas studied. Our findings contrast with the results of past work in sediments with well-lit and nutrient poor conditions, or sediments with high densities of other snail grazers. In conjunction this and other investigations indicate that the response of sediment microalgae to nutrient enrichment and modified grazer abundance depends to a large extent on the initial levels of nutrient availability and grazing before the system is altered.

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confidence: 55%

Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of short-term sediment nutrient enrichment and grazer <i>(Neritina reclivata)</i> removal on sediment microalgae in a shallow eutrophic estuary (Alabama, USA)

Cebrián

Stutes

Phipps

et al. 2012

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“…There is regional information on benthic microalgal ecology and biogeochemistry of shallow systems in the Northern Gulf of Mexico (nGoM) (e.g., Stutes et al 2006, Cebrian et al 2009). Therefore, coastal shallow systems in nGoM represent an ideal location for disentangling contribution of diatoms to production in seagrass beds.…”

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confidence: 99%

Do diatoms dominate benthic production in shallow systems? A case study from a mixed seagrass bed

Cox

Cebrián

Tabor

et al. 2020

Limnol Oceanogr Letters

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Diatoms are ubiquitous members of macrophyte beds. They are part of the water column community and are found in the benthos, in the sediment and as epiphytes. It is recognized that assemblages in these coastal habitats are highly productive, yet diatom contribution to production has not been quantified directly. We disentangled contributions of diatoms from other producers in a seagrass bed by employing a diatom inhibitor and measuring community production and respiration. We found that the contribution of diatoms to benthic production in a seagrass habitat was substantial (71-83%). Diatom contribution in the water column and in an open sediment habitat was more variable (0-86%). Therefore, seagrasses allow for colonization of productive diatom assemblages. If contributions are similar among systems, this could represent a significant term in regional budgets that has been underestimated.

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Fish, Macroinvertebrate and Epifaunal Communities in Shallow Coastal Lagoons with Varying Seagrass Cover of the Northern Gulf of Mexico

McDonald

Moody

Heck

et al. 2015

Estuaries and Coasts

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Effects of ultraviolet-B radiation and nutrient enrichment on the productivity of benthic microalgae in shallow coastal lagoons of the North Central Gulf of Mexico

Cited by 10 publications

References 63 publications

Effects of short-term sediment nutrient enrichment and grazer <i>(Neritina reclivata)</i> removal on sediment microalgae in a shallow eutrophic estuary (Alabama, USA)

Effects of short-term sediment nutrient enrichment and grazer <i>(Neritina reclivata)</i> removal on sediment microalgae in a shallow eutrophic estuary (Alabama, USA)

Do diatoms dominate benthic production in shallow systems? A case study from a mixed seagrass bed

Fish, Macroinvertebrate and Epifaunal Communities in Shallow Coastal Lagoons with Varying Seagrass Cover of the Northern Gulf of Mexico

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