Experimental analysis of the response and recovery of Zostera marina (L.) and Halodule wrightii (Ascher.) to repeated light-limitation stress

Biber, Patrick D.; Kenworthy, W. J.; Paerl, Hans W.

doi:10.1016/j.jembe.2008.10.031

Cited by 41 publications

(42 citation statements)

References 43 publications

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“…Greater coverage and density of seagrass patches were observed at Golfo La Perra, where leaf-length reached 20 cm, than at Corral de Mulas, where seagrass coverage and density appeared lower and leaf-length was shorter (3-10 cm), possibly due to higher levels of freshwater run-off from degraded forest conditions surrounding the area. Although leaf-length values for H. wrightii from Bahía de Jiquilisco fall within the range of values reported in other regions (e.g., Phillips & Meñez, 1988;Biber et al, 2009;Sordo et al, 2011), maximum leaf-length (20 cm) at our study area is more than double the maximum value (7.2 cm) at Cape Verde in the eastern Atlantic (Creed et al, 2016). We observed an increased presence of unidentified species of macroalgae in H. wrightii patches at Corral de Mulas, presumably resulting from sustained nutrient loads from proximate land-based human activities.…”

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confidence: 82%

“…As with other species of seagrasses, the morphology, fitness, and distribution of H. wrightii can be strongly influenced by environmental factors, including temperature, salinity, and nutrient and light availability (Short & Duarte, 2001;Ralph et al, 2007;Howard et al, 2016). For example, light limitation can produce physiological stress that decreases plant growth and biomass production, diminishes density, increases shoot mortality, and limits depth distribution (Phillips & Meñez, 1988;Biber et al, 2009). Given its high light requirements, the survival of H. wrightii is particularly vulnerable to declines in water quality from system-wide changes induced by natural events or cultural eutrophication (Tiling & Proffitt, 2017).…”

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confidence: 99%

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Shoalgrass Halodule wrightii (Ascherson, 1868) meadows in El Salvador: distribution and associated macroinvertebrates at the estuary complex of Bahia de Jiquilisco

Ramírez¹,

Menjívar

Cerén

et al. 2017

lajar

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ABSTRACT. Seagrasses are aquatic angiosperms that grow submerged in shallow marine and estuarine environments worldwide. Halodule wrightii is a circumtropically distributed seagrass species found primarily in the Atlantic Ocean, but also in parts of the Indian Ocean and eastern Pacific Ocean. Along the Pacific coast of Central America, large swaths of the reported distribution of H. wrightii are assumptions based on interpolation between known seagrass point locations, and despite confirmation of H. wrightii occurrence in Bahía de Jiquilisco in El Salvador, little is known about its distribution and associated species, which can hamper efforts to conserve this seagrass ecosystem. To address these gaps in data, we provide the first assessment of H. wrightii distribution and associated macroinvertebrate species in Bahía de Jiquilisco. We identified six areas where seagrasses occurred and two of these were selected for monitoring. At the two sampled areas, heterogeneous patches of H. wrightii covered 27.1 km 2 with 22 associated macroinvertebrate species from three taxonomic groups in three phyla. We conclude by discussing local threats to H. wrightii, including implications for endangered hawksbill (Eretmochelys imbricata and green (Chelonia mydas agassizii) turtles that depend on these ecosystems, and describe opportunities for conservation in Bahía de Jiquilisco.

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confidence: 82%

mentioning

confidence: 99%

Shoalgrass Halodule wrightii (Ascherson, 1868) meadows in El Salvador: distribution and associated macroinvertebrates at the estuary complex of Bahia de Jiquilisco

Ramírez¹,

Menjívar

Cerén

et al. 2017

lajar

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“…The duration of PFDs above light saturation points (H sat ) has also been used to predict carbon balance and seagrass production (Dennison & Alberte 1982, 1985, Zimmerman et al 1994. Therefore, reduction in underwater light intensity and/or duration is one of the main environmental stresses leading to seagrass declines and affecting distribution patterns (Cabello-Pasini et al 2002, Holmer & Laursen 2002, Thom et al 2008, Biber et al 2009). …”

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confidence: 99%

Annual and perennial life history strategies of Zostera marina populations under different light regimes

Kim¹,

Kim²,

Park³

et al. 2014

Mar. Ecol. Prog. Ser.

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“…The lower rhizome carbohydrate concentration observed in the high Codium cover treatment highlights the importance of carbohydrate reserves in determining the vulnerability of eelgrass. In general, the recovery period for carbohydrate reserves for seagrasses after light deprivation-related stress is at least as long as or longer than the stress period (Biber et al 2009). …”

Section: Effects Of Codium Densitymentioning

confidence: 99%

Detecting the impacts of notorious invaders: experiments versus observations in the invasion of eelgrass meadows by the green seaweed Codium fragile

2011

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Biological invasions can vary in the extent of their effects on indigenous communities but predicting impacts for particular systems remains difficult. In coastal marine ecosystems, the green seaweed Codium fragile ssp. fragile is a notorious invader with its reputation based on studies conducted largely on rocky shores. The green seaweed has recently invaded soft-bottom eelgrass communities by attaching epiphytically to eelgrass (Zostera marina) rhizomes, thereby creating the potential for disruption of these coastal habitats through competition or disturbance. We investigated the effect of this invader on various aspects of eelgrass performance (shoot density and length, shoot growth, above- and below-ground biomass, carbohydrate storage) using both small-scale manipulative and large-scale observational experiments. Manipulative experiments that varied Codium abundance demonstrated clear negative effects over a 4-month period on shoot density and carbohydrate reserves, but only for high, but realistic, Codium biomass levels. Light levels were much lower under canopies for high and medium density Codium treatments relative to low and control Codium cover treatments, suggesting that shading may influence eelgrass growing under the algal cover. In contrast, these effects were either not detectable or very weak when examined correlatively with field surveys conducted at larger spatial scales, even for sites that had been invaded for over 4 years. It is premature to extend generalizations of Codium's impact derived from studies in other systems to eelgrass communities; further efforts are required to assess the long-term threats that the alga poses to this ecosystem. This study demonstrates the need to investigate impacts of invasions over multiple scales, especially those that incorporate the temporal and spatial heterogeneity of the invader's abundance.

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Experimental analysis of the response and recovery of Zostera marina (L.) and Halodule wrightii (Ascher.) to repeated light-limitation stress

Cited by 41 publications

References 43 publications

Shoalgrass Halodule wrightii (Ascherson, 1868) meadows in El Salvador: distribution and associated macroinvertebrates at the estuary complex of Bahia de Jiquilisco

Shoalgrass Halodule wrightii (Ascherson, 1868) meadows in El Salvador: distribution and associated macroinvertebrates at the estuary complex of Bahia de Jiquilisco

Annual and perennial life history strategies of Zostera marina populations under different light regimes

Detecting the impacts of notorious invaders: experiments versus observations in the invasion of eelgrass meadows by the green seaweed Codium fragile

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