The effects of shading on Chara zeylanica KLEIN ex WILD. and associated epiphytes

Grimshaw, Herbert J.

doi:10.1127/0003-9136/2005/0162-0253

Cited by 5 publications

(2 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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“…Clonal integration plays a crucial ecological role in mitigating the effects of clonal fragmentation caused by nature and humans. To improve the health of plant systems and the conservation of canopy biodiversity, it may be pertinent to reduce the level of fragmentation and promote system connectivity ( Zotz and Hietz, 2001 ; Grimshaw et al., 2005 ; Zhang et al., 2009 ). Numerous studies have found that native plants and invasive plants in both wetland and terrestrial habitats exhibit excellent clonal growth capabilities under clonal fragmentation with severe disturbances, allowing rapid growth and reproduction not for native species but for invasive plants ( Dong et al., 2012 ; Li et al., 2013 ; Zhang et al., 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of clonal fragmentation on Pyrrosia nuda depend on growth stages in a rubber plantation

Yu,

Jin,

Bai

et al. 2024

Front. Plant Sci.

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IntroductionClonal fragmentation helps to assess clonal plants' growth resilience to human and environmental disturbance. Although clonal integration in epiphytes in tropical rubber plantations is important to understand their role in enhancing biodiversity and ecosystem services, research on this subject is limited. These plantations are typically monospecific economic forests that face increased anthropogenic disturbances.MethodsIn this study, we selected the clonal fern Pyrrosia nuda to study its survival status, biomass, maximum quantum yield of photosystem II (Fv/Fm), and frond length in response to the level of clonal fragmentation in a tropical rubber plantation.Results and discussionThe results showed that (1) clonal fragmentation significantly negatively affected the survival rate, biomass, and frond length of clonal plants, but with minimal effects on Fv/Fm at different growth stages; (2) the performance of a ramet (e.g., biomass or frond length) increased with ramet developmental ages and decreased with the number of ramets in a clonal fragment. The age-dependent impacts of clonal fragmentation provide insights into the biodiversity conservation of epiphytes and forest management in man-made plantations. Therefore, to better conserve the biodiversity in tropical forests, especially in environment-friendly rubber plantations, there is a need to reduce anthropogenic disturbances and alleviate the level of fragmentation.

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Substrate manipulation near the outflow of a constructed wetland reduced internal phosphorus loading from sediments and macrophytes

Grace¹,

Juston

Finn³

et al. 2019

Ecological Engineering

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The effects of shading on Chara zeylanica KLEIN ex WILD. and associated epiphytes

Cited by 5 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)

Effects of clonal fragmentation on Pyrrosia nuda depend on growth stages in a rubber plantation

Substrate manipulation near the outflow of a constructed wetland reduced internal phosphorus loading from sediments and macrophytes

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