Impacts of Episodic Freshwater Inflow Pulses on Seagrass Dynamics in the Lower Laguna Madre, Texas, 1998–2017
Impacts of Episodic Freshwater Inflow Pulses on Seagrass Dynamics in the Lower Laguna Madre, Texas, 1998–2017
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1998 年至 2017 年德克萨斯州马德雷湖下游间歇性淡水流入脉冲对海草动态的影响
DOI:
10.1007/s12237-023-01170-5
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Guthrie, Carla G.
中科院分区:
文献类型:
--
作者:
DeYoe, Hudson R.;Pulich, Warren;Lupher, Melissa;Neupane, Ram;Guthrie, Carla G.
The Lower Laguna Madre of Texas (LLM) is a subtropical, hypersaline lagoon dominated by lush seagrass beds and characterized by a historically low freshwater inflow (FWI) regime. From 1998 to 2012, a net 8.8% seagrass decrease occurred in the LLM, primarilySyringodium filiformeandThalassia testudinum, despite the concomitant expansion ofHalodule wrightii. In the middle region of the LLM affected by a major FWI source, the Arroyo Colorado, the decrease was > 20%. We proposed thatThalassiaandSyringodiumdecrease was largely due to high FWI pulses and N loading from an increasingly modified LLM watershed. Salinity modeling studies showed that FWI pulses lowered salinities for months in this region potentially associated with non-point source nutrient (viz. ungauged) inputs. At a site near the Arroyo Colorado,Thalassiabiomass and shoot density were lower 319.3 g/m2and 567 shoots/m2, respectively versus 1296 g/m2and 3382 shoots/m2for the most productive LLM site. Targeted sampling in four subwatersheds adjacent to the LLM demonstrated high dissolved N loadings (nitrate and organic nitrogen) to the lagoon. Nitrogen isotope analysis of LLM seagrass further indicated that nitrogen was likely from inland wastewater runoff from the Arroyo Colorado. We concluded that freshwater pulses to the lagoon produce hyposaline conditions and high nutrient loading, stressing seagrasses and resulting in diminished resilience and reduced distribution ofThalassiaandSyringodium. With climate change, coastal population growth, and enhanced watershed drainage, episodes of hyposalinity, and enriched nutrient runoff are likely to increase in frequency and duration, altering seagrass resilience and diversity in the LLM.
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DOI:
--
发表时间:
1993
期刊:
影响因子:
--
作者:
M. Quammen;C. Onuf
通讯作者:
C. Onuf
DOI:
--
发表时间:
1974
期刊:
影响因子:
--
作者:
J. Zieman
通讯作者:
J. Zieman
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Meaghan R. Cuddy
通讯作者:
Meaghan R. Cuddy
影响因子:
2.5
作者:
BURKHOLDER, JM;GLASGOW, HB;COOKE, JE
通讯作者:
COOKE, JE
影响因子:
2.7
作者:
R. F. Mooney;J. McClelland
通讯作者:
J. McClelland