Growth responses of the Everglades wet prairie species Eleocharis cellulosa and Rhynchospora tracyi to water level and phosphate availability

Busch, J.; Mendelssohn, Irving A.; Lorenzen, Bent; Brix, Hans; Miao, ShiLi

doi:10.1016/j.aquabot.2003.09.002

Cited by 45 publications

(39 citation statements)

References 24 publications

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“…The similarity among periphyton, open-marsh, and Nymphaea class water depths (Table 3), along with their close proximity to one another, suggest that the sloughs experienced a similar hydroperiod. Typha and Eleocharis growth rates are positively related to water depth (Newman et al 1996, Busch et al 2004. We suspect that the rate of the slough-Typha regime shift, while driven primarily by P, is also influenced by regional hydrologic processes (e.g., floods and droughts).…”

Section: Regime Shift: Slough-typhamentioning

confidence: 96%

Multiple Regime Shifts in a Subtropical Peatland: Community‐specific Thresholds to Eutrophication

Hagerthey

Newman

Rutchey

et al. 2008

Ecological Monographs

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Abstract. Ecosystems have a natural resilience to perturbations, where resilience is the magnitude of a disturbance that an ecosystem can resist before changes in structure, function, and services result in a regime shift. The Everglades region of Florida, USA, has been detrimentally impacted by phosphorus (P) enrichment and a regime shift from Cladium (sawgrass) to Typha (cattail) marsh has been described. We examine another facet of the lownutrient Everglades stability regime, open-water sloughs, to determine if eutrophication leads to similar regime shifts.We analyzed surface water P and soil P as controlling variables that, once a critical threshold is surpassed, alter ecosystem state variables. Nonlinear relationships between P and vegetation were observed along a northern Everglades eutrophication gradient. In addition to the Cladium-Typha regime shift, a second independent regime shift, slough-Typha, was identified. Synoptic surveys of 49 sloughs within the boundary between the slough and Typha regime revealed that surface water total phosphorus (TP) and the benthic algal floc layer (BAFL) were the controlling variables, with critical thresholds of 11 lg/L and 412 mg/kg, respectively. The slough regime below these thresholds was characterized by calcareous periphyton (BAFL TP ¼ 298 mg P/kg; BAFL calcium ¼ 149 g Ca/kg). Above the TP thresholds, vegetation composition shifted to open-marsh species with significantly higher BAFL TP (700 mg P/kg) and total organic carbon (TOC) (350 g C/kg). A second BAFL TP threshold occurred at 712 mg P/kg, above which Nymphaea dominated and BAFL TP (1034 mg P/kg) and TOC (417 g C/kg) significantly increased. Nymphaea sloughs transitioned to the Typha regime. The boundary reflects the loss of ecosystem resilience due to eutrophication. Both low-nutrient stability regimes (slough and Cladium) lie precariously close to the P critical threshold but differ in how eutrophication is absorbed and resisted. The slough regime transitions rapidly through a series of ecosystem state changes linked to positive feedback loops that affect P dynamics, whereas the Cladium regime does not. An adaptive management strategy has been implemented to address the surface water TP threshold; however, to ensure successful restoration of the Everglades, the BAFL and soil TP thresholds also need to be considered.

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Section: Regime Shift: Slough-typhamentioning

confidence: 96%

Multiple Regime Shifts in a Subtropical Peatland: Community‐specific Thresholds to Eutrophication

Hagerthey

Newman

Rutchey

et al. 2008

Ecological Monographs

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“…En el presente trabajo es importante conocer algunas de estas adaptaciones para entender la permanencia o ausencia de las especies en los sitios. Por ejemplo, los estudios realizados por Busch et al (2004) y Baksh y Richards (2006) mencionan que, bajo condiciones críticas de inundación, los brotes jóvenes de Eleocharis cellulosa al entrar en contacto con el agua crecen más rápido y producen tallos más gruesos y altos, generando una mayor biomasa aérea en relación con la biomasa subterránea. En secas, estos brotes mueren, pero la especie puede soportar largos períodos de estiaje y producir nuevos brotes, aunque con crecimiento más lento.…”

Section: Rb1unclassified

Efecto de la ganadería y la variación estacional sobre la composición florística y la biomasa vegetal en los humedales de la costa centro oeste del Golfo de México

2017

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Efecto de la ganadería y la variación estacional sobre la composición florística y la biomasa vegetal en los humedales de la costa centro oeste Resumen:Antecedentes y Objetivos: Los humedales son ecosistemas altamente productivos que aportan diversos servicios ecosistémicos; sin embargo, también son de los más amenazados debido a actividades humanas como la agricultura y ganadería. México ha perdido 62% de sus humedales y específicamente los de la costa central del Golfo de México se están viendo afectados debido a la actividad ganadera. Existen pocos trabajos acerca del tema; por tanto, en esta investigación se analizó el efecto de la ganadería y la estacionalidad sobre la composición florística, biomasa aérea (BA) y biomasa subterránea (BS) de humedales herbáceos de la laguna de Alvarado, Veracruz, México. Métodos: Se seleccionaron dos localidades de trabajo y en cada una se eligieron dos sitios de muestreo. En cada sitio se colocaron ocho parcelas de 1 m² (la mitad fueron cercadas para evitar al ganado). Durante un año se obtuvieron datos de riqueza y diversidad de especies, cobertura vegetal, BA y BS. Con estos datos se calculó el valor de importancia relativa (VIR) por especie e índice de reemplazo de especies.Resultados clave: Se registraron 29 especies y se observó un gradiente de perturbación, resultando las localidades de Río Blanco las más conservadas. En general la riqueza fue significativamente mayor en lluvias y las especies con mayor VIR fueron las propias de humedales, aunque hubo gramíneas dominantes en ambas temporadas. La BS fue significativamente mayor en Río Blanco (sitio 1), y la BA en Río Blanco 1 y Río Limón 1. En lluvias la BA fue mayor en la mitad de los sitios. Conclusiones: Con los resultados de este trabajo se observa que los humedales herbáceos de agua dulce pueden conservar sus funciones ecológicas en presencia de la ganadería siempre y cuando sea de bajo impacto. Inclusive, si ésta se practica de manera controlada, puede favorecer la diversidad de especies nativas del humedal y limitar el crecimiento de pastos invasores. Palabras clave: especies invasoras, impacto humano, inundación, popales, riqueza florística. Abstract:Background and Aims: Wetlands are highly productive ecosystems, which provide many environmental services. However, they are one of the most threatened due to human activities such as agriculture and livestock. Mexico has lost 62% of its wetlands and specifically those of the central coast of the Gulf of Mexico are being affected due to livestock pressure. There are very few studies about the subject, so in this paper we analyze the effect of livestock and seasonality on floristic composition, above ground biomass (AB) and below ground biomass (BB) of the Alvarado lagoon, Veracruz, Mexico. Methods: We selected two working locations, and in each locality chose two sampling sites. In each site, we placed eight 1 m² plots of four different locations (half were fenced to keep out livestock). For an entire year we obtained species richness and diversity, and data on veg...

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“…Vegetation communities have unique equilibrium peat elevations because of differences in their organic matter production and decomposition curves (Figure 4) that respectively result from context-specific differences in the physiological tolerance and competitive ability of individual species (Givnish et al, 2008) and from detrital organic carbon quality (Busch et al, 2004;DeBusk and Reddy, 1998;Mitsch and Gosselink, 2000) and enzyme activity (Penton and Newman, 2008). Tree species cannot tolerate deeper water but can overtop herbaceous plants on better-drained sites, leading to their dominance on islands; sawgrass outcompetes water lilies and submersed aquatics on inundated ridges but cannot tolerate the deeper water in sloughs (Givnish et al, 2008).…”

Section: Theorymentioning

confidence: 99%

Recent and Historic Drivers of Landscape Change in the Everglades Ridge, Slough, and Tree Island Mosaic

Larsen

Aumen

Bernhardt

et al. 2011

Critical Reviews in Environmental Science and Technology

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Growth responses of the Everglades wet prairie species Eleocharis cellulosa and Rhynchospora tracyi to water level and phosphate availability

Cited by 45 publications

References 24 publications

Multiple Regime Shifts in a Subtropical Peatland: Community‐specific Thresholds to Eutrophication

Multiple Regime Shifts in a Subtropical Peatland: Community‐specific Thresholds to Eutrophication

Efecto de la ganadería y la variación estacional sobre la composición florística y la biomasa vegetal en los humedales de la costa centro oeste del Golfo de México

Recent and Historic Drivers of Landscape Change in the Everglades Ridge, Slough, and Tree Island Mosaic

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