The effects of shading on morphometric and meristic characteristics of Wild Celery, Vallisneria americana MICHX., transplants from Lake Okeechobee, Florida

Grimshaw, Herbert J.; Havens, Kay; Sharfstein, Bruce; Steinman, Alan D.; Anson, D.; East, Therese L.; Maki, Ryan P.; Rodusky, Andrew J.; Jin, Kemo

doi:10.1127/archiv-hydrobiol/155/2002/65

Cited by 16 publications

(6 citation statements)

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“…Harwell & Havens (2003) showed that when sediments from the shoal area are covered with water in the laboratory and provided with 100 lmol photons m )2 s )1 irradiance, germination of Chara greatly exceeds germination of vascular SAV. Furthermore, in controlled tank studies performed with Chara and Vallisneria from Lake Okeechobee, Grimshaw et al (2002Grimshaw et al ( , 2004 established that the minimum irradiance required for net growth is lower in Chara than in the vascular plant. When water clarity improved in areas of the lake where Chara lawns expanded (Havens et al, 2001(Havens et al, , 2004, this may have created conditions conducive to vascular plant germination and growth.…”

Section: Aquatic Vegetation Recoverymentioning

confidence: 98%

Aquatic vegetation and largemouth bass population responses to water-level variations in Lake Okeechobee, Florida (USA)

et al. 2005

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A five-year study examined the responses of submerged aquatic vegetation (SAV), emergent vegetation, and largemouth bass (Micropterus salmoides) to variations in water level in a large lake in Florida, USA. SAV was assessed using a combined transect survey/spatial mapping approach, emergent vegetation was quantified with aerial photography and GIS, and bass were surveyed by electro-shocking. During the period leading up to this study (1995)(1996)(1997)(1998)(1999), water levels were high in the lake, and the SAV was reduced in spatial extent and biomass, compared to its condition in the early 1990s. Spatial extent of emergent vegetation also was low, and largemouth bass surveys indicated low densities and failure to recruit young fish into the population. This was attributed to the lack of critical vegetative habitat. In spring 2000, the lake was lowered by discharging water from major outlets, and this was followed by a regional drought. Water levels dropped by 1 m, and there was widespread development of Chara lawns in shoreline areas, with coincident increases in water clarity. There was some germination of vascular SAV, but Chara was the extreme dominant, such that structural complexity remained low. There was no substantive improvement in bass recruitment. During 2001, water levels declined further, and emergent plants germinated in exposed areas of the lake bottom. SAV was restricted to sites farther offshore, and continued to be dominated by Chara. There again was no bass response. In 2002, conditions changed when water levels increased to a moderate depth, flooding shoreline habitat to $0.5 m. Vascular SAV increased in biomass and spatial extent, such that the community developed a high structural complexity. At the same time, emergent aquatic plants developed dense stands along the western shoreline. Largemouth bass had a strong recruitment of young fish for the first time in 5 years. Recruitment continued to be successful in 2003, when spatial extent of SAV was somewhat reduced by higher water but total biomass and diversity remained high. These results demonstrate an important effect of inter-annual variation in water depth on the population dynamics of aquatic plants and fish in a subtropical lake.

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Section: Aquatic Vegetation Recoverymentioning

confidence: 98%

Aquatic vegetation and largemouth bass population responses to water-level variations in Lake Okeechobee, Florida (USA)

et al. 2005

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“…Light acclimatization strategies include mechanisms for effective light harvesting at low light conditions (Grimshaw et al ., 2002) and protection against excessive light (Rmiki et al ., 1996). Aquatic macrophyte species groups (charophytes, bryophytes, caulescent angiosperms, rosette‐type angiosperms and Isoetes spp.)…”

Section: Introductionmentioning

confidence: 99%

Growth towards light as an adaptation to high light conditions in Chara branches

Schneider¹,

Ziegler²,

Melzer³

2006

New Phytologist

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Summary• Growth of plants or plant organs towards more light is commonly interpreted as an adaptation to low light conditions. Here, we show for the first time, in a study of charophyte branches, a growth-based orientation towards light functioning as a mechanism to protect the plant from excessive light.• Two Chara species were exposed to five different intensities of photosynthetically active radiation and species traits and pigmentation were measured.• Branches of plants exposed to higher light intensities were convergent and pointed steeply upwards, whereas those exposed to lower light intensities grew nearly straight and were less inclined. Only branches that increased in length during the experiments reacted to differences in light intensity. This indicates that branch orientation is determined by a light-dependent growth reaction. Orientation of charophyte branches towards light is accompanied by a decrease in chlorophyll a (Chl a ) content and a lower Chl a : carotenoid ratio, which clearly indicates that the plant is taking protective measures against potentially damaging excess light conditions.• We suggest that the growth-based orientation of Chara branches towards light may protect sexual organs, which grow on adaxial branch sides, from light damage. In addition, the upward orientation of branches might lead to increased light transmission within dense charophyte beds, thus enabling an enhanced gross production.

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“…Differently from what found on mass basis in previous works (Tóth et al, 2019), foliar pigment content on area basis did not separate alien and native plants as distinctively as other traits, although a certain degree of segmentation at species level was found for pigments balance measures. This could imply that interspecific differentiation in studied macrophytes is driven more by pigment proportions, and therefore by the ability of species to adapt to given environment and maximise both light absorption and photoprotection (Grimshaw et al, 2002;Hussner et al, 2010). Such a multifaceted response, including both general and unique attributes of different species groups (i.e.…”

Section: Discussionmentioning

confidence: 99%

Leaf reflectance can surrogate foliar economics better than physiological traits across macrophyte species

Villa

Bolpagni

Pinardi

et al. 2020

Preprint

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Macrophytes are key players in aquatic ecosystems diversity, but knowledge on variability of their functional traits, among and within species, is still limited. Remote sensing is a high-throughput, feasible option for characterizing plant traits at different scales, provided that reliable spectroscopy models are calibrated with congruous empirical data.We sampled leaves from six macrophyte species common in temperate areas, covering different phenological stages, seasons, and environmental conditions, and measured leaf reflectance (400-2500 nm) and traits (dealing with photophysiology, pigments and leaf economics). We explored optimal spectral bands combinations and established non-parametric reflectance-based models for selected traits, eventually showing how airborne hyperspectral data can capture spatial-temporal macrophyte variability.Our key finding is that structural, leaf dry matter content, leaf mass per area (LMA), and biochemical, chlorophyll-a content and chlorophyll to carotenoids ratio, traits can be surrogated by leaf reflectance with relative error under 20% across macrophyte species, while performance of reflectance-based models for photophysiological traits depends on species.This finding shows the link between leaf reflectance and structural-biochemical traits for aquatic plants, thus supporting the use of remote sensing for enhancing the level of detail of macrophyte functional diversity analysis, to intra-site and intra-species scales.

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The effects of shading on morphometric and meristic characteristics of Wild Celery, Vallisneria americana MICHX., transplants from Lake Okeechobee, Florida

Cited by 16 publications

References 0 publications

Aquatic vegetation and largemouth bass population responses to water-level variations in Lake Okeechobee, Florida (USA)

Aquatic vegetation and largemouth bass population responses to water-level variations in Lake Okeechobee, Florida (USA)

Growth towards light as an adaptation to high light conditions in Chara branches

Leaf reflectance can surrogate foliar economics better than physiological traits across macrophyte species

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