نتایج جستجو برای: Chlorophyll a

تعداد نتایج: 13436215  

2015
Andrew M. Lohrer Simon F. Thrush Judi E. Hewitt Casper Kraan

In the original version of this Article, the Abstract contains a typographical error. " Additional experimentation illustrated how these effects amplified over time, resulting in greater primary producer biomass sediment chlorophyll a content (Chla) in the longer term ". should read: " Additional experimentation illustrated how these effects amplified over time, resulting in greater primary pro...

2015
Saïkou Oumar Kidé Claude Manté Laurent Dubroca Hervé Demarcq Bastien Mérigot George Tserpes

Environmental changes and human activities can have strong impacts on biodiversity and ecosystem functioning. This study investigates how, from a quantitative point of view, simultaneously both environmental and anthropogenic factors affect species composition and abundance of exploited groundfish assemblages (i.e. target and non-target species) at large spatio-temporal scales. We aim to invest...

Journal: :Current Biology 2011
Heroen Verbruggen Aline Tribollet

and an increased chlorophyll b to chlorophyll a ratio for better light capture in low light. Furthermore, an Ostreobium strain living in a coral skeleton, where nearly all of the red light has been captured by the zooxanthellae in the coral tissue, has been shown to have modified chlorophyll with a spectrum shifted towards far-red wavelengths. As zooxanthellae cannot use far-red light, more of ...

2016
Yunlin Zhang Xiaohan Liu Boqiang Qin Kun Shi Jianming Deng Yongqiang Zhou

Terrestrial and aquatic ecosystem degradation is widely recognized as a major global environmental and development problem. Although great efforts have been made to prevent aquatic ecosystem degradation, the degree, extent and impacts of this phenomenon remain controversial and unclear, such as its driving mechanisms. Here, we present results from a 17-year field investigation (1998-2014) of wa...

2015
Lisa Fauteux Matthew T. Cottrell David L. Kirchman Carles M. Borrego Maria Carolina Garcia-Chaves Paul A. del Giorgio

There is now evidence that aerobic anoxygenic phototrophic (AAP) bacteria are widespread across aquatic systems, yet the factors that determine their abundance and activity are still not well understood, particularly in freshwaters. Here we describe the patterns in AAP abundance, cell size and pigment content across wide environmental gradients in 43 temperate and boreal lakes of Québec. AAP ba...

2014
Jing Zhang Wenjiang Huang Qifa Zhou

The in-chlorophyll centre waveband (ICCW) (640-680 nm) is the specific chlorophyll (Chl) absorption band, but the reflectance in this band has not been used as an optimal index for non-destructive determination of plant Chl content in recent decades. This study develops a new spectral index based solely on the ICCW for robust retrieval of leaf Chl content for the first time. A glasshouse experi...

2005
Neal Michelutti Alexander P. Wolfe Rolf D. Vinebrooke Benoit Rivard Jason P. Briner

[1] A new application of reflectance spectroscopy enables inferences of lake sediment chlorophyll a concentrations and hence of historical trends in lacustrine primary production. In a survey of six arctic lakes on Baffin Island (Nunavut, Canada), pronounced increases of spectrally-inferred chlorophyll a concentrations are consistently expressed in sediments deposited during the 20th century. C...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2001
M Akiyama H Miyashita H Kise T Watanabe S Miyachi M Kobayashi

Journal: :Biofouling 2011
Alaina H Campbell Donald W Meritt Rima B Franklin Edward L Boone Carol T Nicely Bonnie L Brown

Lack of success in restoring the native Eastern oyster, Crassostrea virginica, to Chesapeake Bay has been linked to the low occurrence of oyster larval setting in tributaries to the Bay. Among the many potential factors that could affect efforts to produce oysters through aquaculture or supplementation of shell beds is substratum condition. The present study examined larval setting on field-pro...

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