Hydrology, Water Quality, and Aquatic Communities of Selected Springs in the St. Johns River Water Management District, Florida

Walsh, Stephen J.; Knowles, Leel; Katz, Brian G.; Strom, Douglas G.

doi:10.3133/sir20095046

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…However, there is some debate on how von Bertalanffy [24,68] defines catabolism and whether catabolism includes processes related to routine behaviors such as obtaining food [43]. Empirically, the spring systems studied here are remarkably thermally stable [36], reducing any direct temperature-related effects on k as have been shown in other studies [44]. We were additionally unwilling to discern whether a specific environmental covariate would solely affect anabolic or catabolic processes as none directly measured density-dependent effects or food availability.…”

Section: Discussionmentioning

confidence: 94%

“…Wekiwa Springs in Orange County, Florida (Figure 1) is a second magnitude spring that opens up to a large slow-flowing pool (149 × 98 × 6.5 m, length x width x height) then narrows (6-12 m wide) becoming the 1.3 km long Wekiwa Springs Run [36]. Invasive aquatic weeds, principally hydrilla, have been an issue in the past, while algal bloom issues persist [12,16,37].…”

Section: Sampling Sitesmentioning

confidence: 99%

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Somatic Growth and Maturity for Four Species of River Cooter Including Pseudemys concinna suwanniensis, P. nelsoni, P. peninsularis, and P. texana

Siders

Stratmann²,

Tomaszewicz

et al. 2023

Biology

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Pseudemys is a genus of commonly occurring freshwater turtles with limited growth information across their long lifespans. We used 11,361 mark-recapture events to estimate the somatic growth rates of P. nelsoni, P. peninsularis, P. concinna suwanniensis, and P. texana from freshwater springs and developed a Bayesian growth model to estimate the species-specific, site-specific, and individual effects on growth. We corroborated evidence for fast juvenile growth and slower adult growth in Pseudemys but found uncommonly fast growth rates, with turtles doubling or tripling in size in the first year. P. texana males had the smallest average maximum size (L∞, 243 mm), while P. c. suwanniensis females had the largest (423 mm). Environmental conditions at springs had significant effects on k, the growth coefficient, but not L∞. We derived, using a ratio of length at maturity to L∞ (71.7% and 87%, males and females), that females matured 1.15–1.57 times older than males except for P. c. suwanniensis, which matured three times older. Given the local abundance declines in many Pseudemys from anthropogenic impacts, this study provides important baseline life history information for Pseudemys species for use in ongoing conservation efforts and presents a novel hierarchical modeling approach using a long-term mark-recapture dataset.

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Section: Discussionmentioning

confidence: 94%

Section: Sampling Sitesmentioning

confidence: 99%

Somatic Growth and Maturity for Four Species of River Cooter Including Pseudemys concinna suwanniensis, P. nelsoni, P. peninsularis, and P. texana

Siders

Stratmann²,

Tomaszewicz

et al. 2023

Biology

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“…It forms the headwater of the Silver River, which is the largest tributary of the Ocklawaha River (Rosenau et al , ). The Silver Springs is a well‐known tourist attraction because of its naturally clear water, aquatic wildlife and famous glass bottom boats (Samek, ; King, ; Walsh et al , ). Recently, the area has experienced rapid population growth, and the surrounding rural area has undergone development (Phelps, ).…”

Section: Silver Springsmentioning

confidence: 99%

Quantifying changes of effective springshed area and net recharge through recession analysis of spring flow

Ghosh

Wang

Bilskie

et al. 2016

Hydrological Processes

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The average flow of Silver Springs, one of the largest magnitude springs in Central Florida, declined 32% from 2000 to 2012. The average groundwater head in the springshed declined 0.14 m, and the spring pool altitude increased 0.24 m during the same period. This paper presents a novel explanation of the spring flow recession curve for Silver Springs using the Torricelli model, which uses the groundwater head at a sentinel well, the spring pool altitude and the net recharge to groundwater. The effective springshed area and net recharge (defined as recharge minus groundwater pumping and evapotranspiration) were estimated based on the observed recession slopes for spring flow, groundwater head and spring pool altitude. The results indicate that the effective springshed area continuously declined since 1989 and the net recharge declined since the 1970s with a significant drop in 2002. Subsequent to 2002, the net recharge increased modestly but not to the levels prior to the 1990s. The reduction in net recharge was caused by changes in hydroclimatic conditions including precipitation and air temperature, along with groundwater withdrawals, which contributed to the declined spring flow. Copyright © 2016 John Wiley & Sons, Ltd.

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“…Environmental Protection Agency (2010). Yet, elevated levels commonly above natural background concentrations can have deleterious effects on the environmental health of the fragile spring ecosystems and other downstream biota (Walsh et al, 2009). In recognition of these factors, a NO 3 − –N (plus nitrite) concentration of 0.35 mg L −1 was recently proposed as a protective criterion for aquatic life in Florida's springs and clear streams (U.S.…”

mentioning

confidence: 99%

Soil Property Control of Biogeochemical Processes beneath Two Subtropical Stormwater Infiltration Basins

et al. 2012

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Substantially different biogeochemical processes affecting nitrogen fate and transport were observed beneath two stormwater infiltration basins in north‐central Florida. Differences are related to soil textural properties that deeply link hydroclimatic conditions with soil moisture variations in a humid, subtropical climate. During 2008, shallow groundwater beneath the basin with predominantly clayey soils (median, 41% silt+clay) exhibited decreases in dissolved oxygen from 3.8 to 0.1 mg L−1 and decreases in nitrate nitrogen (NO3−–N) from 2.7 mg L−1 to <0.016 mg L−1, followed by manganese and iron reduction, sulfate reduction, and methanogenesis. In contrast, beneath the basin with predominantly sandy soils (median, 2% silt+clay), aerobic conditions persisted from 2007 through 2009 (dissolved oxygen, 5.0–7.8 mg L−1), resulting in NO3−–N of 1.3 to 3.3 mg L−1 in shallow groundwater. Enrichment of δ15N and δ18O of NO3− combined with water chemistry data indicates denitrification beneath the clayey basin and relatively conservative NO3− transport beneath the sandy basin. Soil‐extractable NO3−–N was significantly lower and the copper‐containing nitrite reductase gene density was significantly higher beneath the clayey basin. Differences in moisture retention capacity between fine‐ and coarse‐textured soils resulted in median volumetric gas‐phase contents of 0.04 beneath the clayey basin and 0.19 beneath the sandy basin, inhibiting surface/subsurface oxygen exchange beneath the clayey basin. Results can inform development of soil amendments to maintain elevated moisture content in shallow soils of stormwater infiltration basins, which can be incorporated in improved best management practices to mitigate NO3− impacts.

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Hydrology, Water Quality, and Aquatic Communities of Selected Springs in the St. Johns River Water Management District, Florida

Cited by 6 publications

References 16 publications

Somatic Growth and Maturity for Four Species of River Cooter Including Pseudemys concinna suwanniensis, P. nelsoni, P. peninsularis, and P. texana

Somatic Growth and Maturity for Four Species of River Cooter Including Pseudemys concinna suwanniensis, P. nelsoni, P. peninsularis, and P. texana

Quantifying changes of effective springshed area and net recharge through recession analysis of spring flow

Soil Property Control of Biogeochemical Processes beneath Two Subtropical Stormwater Infiltration Basins

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