Long-term growth trends of baldcypress (Taxodium distichum (L.) Rich.) at Caddo Lake, Texas

Keeland, Bobby D.; Young, P. J.

doi:10.1007/bf03161522

Cited by 18 publications

(9 citation statements)

References 15 publications

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“…At least two (maximum four) cores were extracted from each tree. The cores were extracted at least 3 m above the ground to avoid the deformed rings in the buttressed base (Young et al 1995;Keeland and Young 1997). Cores were dehydrated at 40°C for approximately 2 weeks, then glued onto wooden holders and sanded with progressively finer sandpaper (100-600 grit; 125-16 μm (Orvis and Grissino-Mayer 2002)) to prepare surfaces for reading.…”

Section: Methodsmentioning

confidence: 99%

Growth Responses of Baldcypress to Wastewater Nutrient Additions and Changing Hydrologic Regime

2011

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We used tree-ring analysis to evaluate the combined effects of rising water levels and 13 years of municipal wastewater addition on growth of baldcypress in a subsiding swamp forest in southern Louisiana. Trees in the treatment, downstream outflow, and adjacent untreated control areas all experienced increased growth coinciding with a period of widespread rapid subsidence and waterlevel increases in the late 1960s. Tree growth in the treatment and outflow sites began to decrease before wastewater application began in 1992, and afterward was apparently unaffected by treatment. In contrast, trees in the control site have not experienced growth declines. Hydrological changes caused by subsidence have apparently overwhelmed any effect of wastewater treatment on baldcypress growth. Increasing inundation may have increased growth initially by eliminating competition from species less tolerant of inundation; however, after a decade of sustained higher water, growth declined steadily. Release of baldcypress from competition continues at the topographically higher control site, but growth will likely subsequently decrease as ongoing subsidence and eustatic sea-level rise cause more prolonged inundation. We conclude that short-term increases in water level stimulated growth of baldcypress, but long-term increased inundation was a net stressor and was more important than nutrient limitations in controlling growth at this site.

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Section: Methodsmentioning

confidence: 99%

Growth Responses of Baldcypress to Wastewater Nutrient Additions and Changing Hydrologic Regime

2011

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“…Other studies considering the impacts of impoundment on diameter growth and survival of Taxodium have primarily looked at populations of trees upstream of impoundments (Harms et al 1980;Young et al 1995;Keeland and Young 1997). These studies have found conflicting results, in that responses to flood regime change through time and according to pre-conditioning; however, more continuous, deep flooding does seem to have an adverse effect on diameter growth in Taxodium.…”

Section: Discussionmentioning

confidence: 95%

Changes in Diameter Growth of Taxodium distichum in Response to Flow Alterations in the Savannah River

Palta

Doyle²,

Jackson

et al. 2011

Wetlands

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Efforts to maximize or restore ecological function on floodplains impacted by dam construction have increasingly focused on river flow management. Few studies, however, consider floodplain hydrogeomorphic position and annual climatic variation in dam impact assessment. The Savannah River, a large river ecosystem in the Southeastern United States, was impounded in the 1950's. Our study objectives were: (1) Characterize hydrology in floodplain areas containing Taxodium distichum, and determine how it has been affected by dam operations; (2) Identify basal area increment (BAI) response of Taxodium to annual flooding and climate (dry, average, wet) conditions; (3) Assess BAI response to dam-induced hydrologic changes. Levee and backswamp sites were significantly drier in the post-dam era, and trees at these sites showed a significant post-dam increase in BAI. Lowelevation river sites did not show significant hydrologic differences between pre-and post-dam eras, but BAI was significantly higher in dry years and significantly less sensitive to hydroperiod in the post-dam era. All trees demonstrated a significant quadratic BAI vs. hydroperiod relationship. This study demonstrates that annual productivity of Taxodium trees can be reduced by either drought or flood stress. It also suggests that climate and hydrogeomorphic location mediate dam impacts and productivity-flooding relationships in Taxodium.

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“…Thus, stands of old baldcypress trees in reservoirs do not reflect a preference or requirement for reservoir habitat as might be inferred from presence-absence data alone. Instead, these stands resulted from natural flow conditions prior to reservoir creation that promoted recruitment (Keeland and Young, 1997). While this extreme example is of a tree, similar patterns hold for mobile poikilotherms.…”

Section: Introductionmentioning

confidence: 85%

“…Baldcypress trees (Taxodium distichum) exemplify this problem. This species cannot recruit in the stable hydrologic conditions of southern USA reservoirs (Keeland and Young, 1997). Thus, stands of old baldcypress trees in reservoirs do not reflect a preference or requirement for reservoir habitat as might be inferred from presence-absence data alone.…”

Section: Introductionmentioning

confidence: 98%

Hydrologic habitat preferences of select southeastern USA fishes resilient to river ecosystem fragmentation

Rypel

Bayne

2009

Ecohydrology

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Large-scale habitat preferences of riverine taxa are not always revealed by examining community data. Here, we show how lipid and growth can be used to evaluate hydrologic habitat preferences of fishes resilient to river fragmentation (i.e. species that can tolerate river fragmentation by dams, but not collapse). Lipid content was examined for seven fishes in a major southeastern USA reservoir and its largest lotic tributary over the 5 years. Controlling for effects of sex, size and year of collection, largemouth bass, spotted bass and black crappie had significantly higher lipid in lentic habitat. Conversely, channel catfish and freshwater drum had significantly higher lipid in lotic habitat. There were no significant differences in lipid of bluegill and blacktail shiner between hydrologic habitat types. Fish growth produced concordant results as largemouth bass and spotted bass had significantly faster growth in lentic habitat, whereas channel catfish and freshwater drum had significantly faster growth in lotic habitat. We were also able to document a synchronous spike in lipids of these species in both habitat types during a major drought. We surmise that the spike was driven by enhanced primary production, predator-prey concentration and possibly also reduced reproduction during intense drought. Two conclusions are drawn from this study as a whole. First, long-term lipid and growth observations hold promise for evaluating ecological effects of droughts over long time spans. Second, population characteristics are excellent indicators of habitat preferences and could be used more broadly to elucidate how organisms react to river ecosystem fragmentation and restoration initiatives.

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Long-term growth trends of baldcypress (Taxodium distichum (L.) Rich.) at Caddo Lake, Texas

Cited by 18 publications

References 15 publications

Growth Responses of Baldcypress to Wastewater Nutrient Additions and Changing Hydrologic Regime

Growth Responses of Baldcypress to Wastewater Nutrient Additions and Changing Hydrologic Regime

Changes in Diameter Growth of Taxodium distichum in Response to Flow Alterations in the Savannah River

Hydrologic habitat preferences of select southeastern USA fishes resilient to river ecosystem fragmentation

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