In situ photosynthetic performance of Porites lutea inhabiting contrasting habitats of the Northern Straits of Malacca (NSoM), Malaysia

2021 ◽  
pp. 1-18
Author(s):  
Nur Ain Amani Abdul Mubin ◽  
Michelle Glory G Jonik ◽  
Nadthikphorn Kamphol ◽  
Zakia Sultana Juhi ◽  
Mahadi Mohammad ◽  
...  
Keyword(s):  
Photosynthetic Performance ◽  
Porites Lutea ◽  
Contrasting Habitats ◽  
Straits Of Malacca

scholarly journals Photosynthetic performance of rock-colonising lichens in the Mountain Zebra National Park, South Africa

Koedoe ◽  
1993 ◽  
Vol 36 (1) ◽  
Author(s):  
Dirk Wessels ◽  
Ludger Kappen
Keyword(s):  
South Africa ◽  
Volcanic Rock ◽  
National Park ◽  
Ambient Air ◽  
Early Morning ◽  
Photosynthetic Performance ◽  
The Other ◽  
Air Temperatures ◽  
Desert Regions

The photosynthetic behaviour of endolithic andepilithic lichens characteristic of sedimentary and volcanic rock was investigated in situ in the Mountain Zebra National Park, South Africa. The park forms part of an inland semi-desert known as the Karoo, in the Cape Province. Temperatures within Balfour sandstone were monitored, the results showing that during the early morning, temperatures within the sandstone were nearly 5@C lower than ambient air temperatures. This may enhance the frequency of water condensing on the sandstone, which may be particularly important for the endoliths Leciclea aff. sarcogynoides and Sarcogyne cf. austroafricana. Maximum photosynthetic rates of the investigated species were found at temperatures between 20@C and 30@C, far higher than the recorded optimum temperatures for lichens from temperate and desert regions. Parmelia chlorea was the most productive species. Compared to the other epiliths, Peltula capensis was found to be a moderately productive species. The photosynthetic gain of Leciclea aff. sarcogynoides and Sarcogyne cf. austro-africana was low, but the photosynthetic gain of these two species still exceeded that of Acarospora sp.

Plasticity of marine sponge habitat preferences with regard to light and water motion: the example of Batzella inops (Topsent, 1891) in submerged caves

2018 ◽  
Vol 69 (11) ◽  
pp. 1784
Author(s):  
P. Nemoy ◽  
E. Spanier ◽  
N. Kashtan ◽  
A. Israel ◽  
D. L. Angel
Keyword(s):  
Marine Sponge ◽  
Environmental Conditions ◽  
Photosynthetic Activity ◽  
Habitat Preferences ◽  
Marine Sponges ◽  
Reciprocal Transplantation ◽  
Preferred Habitat ◽  
Contrasting Habitats ◽  
Transplantation Experiments

This study examined the effects of environmental conditions on the distribution of marine sponges. We measured the abundance of the sponge Batzella inops (Topsent, 1891) in two contrasting habitats: inside submerged caves and on the surfaces of submerged boulders. We hypothesised that caves are a preferred habitat for B. inops over the boulder surfaces, and tested this by descriptive (quadrate sampling) and manipulative (reciprocal transplantation) experiments. In addition, we tested B. inops in situ for the presence of photosynthetic activity. We found that B. inops is more abundant inside the caves (mean ± s.e.m., 1.2 ± 0.6individualsm–2) than on the outside boulder surfaces (0.15 ± 0.19individualsm–2). We also detected photosynthetic activity in B. inops in both habitats. The results of transplantation experiments suggested that the sponge prefers the transfer from inside to outside the cave rather than vice versa. Therefore, we conclude that although B. inops is more abundant in sheltered habitats, such as submerged caves, adult individuals of this sponge can survive transfer to exposed conditions. Altogether, our findings point to the plasticity of B. inops habitat preferences and may aid further research into conservation or mariculture of this and possibly other sponge species.

scholarly journals Environmental sensitivity of Neogoniolithon brassica-florida associated with vermetid reefs in the Mediterranean Sea

2016 ◽  
Vol 74 (4) ◽  
pp. 1074-1082 ◽  
Author(s):  
Maoz Fine ◽  
Rami Tsadok ◽  
Dalit Meron ◽  
Stephanie Cohen ◽  
Marco Milazzo
Keyword(s):  
Light Intensity ◽  
Mediterranean Sea ◽  
Global Climate ◽  
High Light Intensity ◽  
Photosynthetic Performance ◽  
Total Alkalinity ◽  
Environmental Sensitivity ◽  
Calcareous Alga ◽  
The Mediterranean

Vermetid reefs in the Mediterranean Sea are increasingly affected by both anthropogenic actions and global climate change, which are putting this coastal ecosystem at risk. The main species involved in building these reefs are two species of intertidal vermetid gastropods and the crustose calcareous alga, Neogoniolithon brassica-florida, which cements the gastropod shells and thus solidifying the reef edges. In the present study, we examined the pattern of distribution in the field and the environmental sensitivity (thermal tolerance, resilience to low pH, high light intensity and desiccation) of N. brassica-florida along the coasts of Sicily and Israel by means of chlorophyll fluorescence and total alkalinity measurements in situ and in the laboratory. Tidal regimes did not affect photosynthesis of N. brassica-florida but light intensity in the intertidal did. Sensitivity to increased light intensity was amplified by elevated temperature and reduced pH. Winter temperature above 16 °C caused a decrease in the photosynthetic performance of photo-system II. Similarly, a decrease in pH resulted in decreased maximum photosynthetic yield and electron transport rate. Calcification was significantly lower at pH 7.9 as compared with ambient (8.1) pH. In fact, dissolution at pH 7.9 at night was higher than net calcification during the day, suggesting that N. brassica-florida may not be able to contribute to reef accretion under the levels of seawater warming and ocean acidification projected by the end of this century.

Physiological plasticity of high-temperature intertidal cyanobacterial microbial mats to temperature and salinity: daily and seasonal in situ photosynthetic performance

2020 ◽  
Vol 55 (2) ◽  
pp. 223-233
Author(s):  
Ángeles Aguilera ◽  
Saara Suominen ◽  
Sólveig Pétursdóttir ◽  
Edda Olgudóttir ◽  
Elísabet Eik Guðmundsdóttir ◽  
...  
Keyword(s):  
High Temperature ◽  
Microbial Mats ◽  
Photosynthetic Performance ◽  
Physiological Plasticity

scholarly journals A luminescent Nanoluc-GFP fusion protein enables readout of cellular pH in photosynthetic organisms

2020 ◽  
pp. jbc.RA120.016847
Author(s):  
Shungo Nakamura ◽  
Nae Fu ◽  
Kumiko Kondo ◽  
Ken-ichi Wakabayashi ◽  
Toru Hisabori ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photosynthetic Performance ◽  
Ph Measurement ◽  
Light Conditions ◽  
Ph Changes ◽  
Photosynthetic Organisms ◽  
Sensor Protein ◽  
Excitation Laser ◽  
Photosynthetic Electron Transfer

pH is one of the most critical physiological parameters determining vital cellular activities, such as photosynthetic performance. Fluorescent sensor proteins capable of measuring in situ pH in animal cells have been reported. However, these proteins require an excitation laser for pH measurement that may affect photosynthetic performance and induce auto-fluorescence from chlorophyll. As a result, it is not possible to measure the intracellular or intra-organelle pH changes in plants. To overcome this problem, we developed a luminescent pH sensor by fusing the luminescent protein Nanoluc to a uniquely designed pH-sensitive GFP variant protein. In this system, an excitation laser is unnecessary because the fused GFP variant reports on the luminescent signal by bioluminescence resonance energy transfer from Nanoluc. The ratio of two luminescent peaks from the sensor protein was approximately linear with respect to pH in the range of 7.0–8.5. We designated this sensor protein as “luminescent pH indicator protein” (Luphin). We applied Luphin to the in situ pH measurement of a photosynthetic organism under fluctuating light conditions, allowing us to successfully observe the cytosolic pH changes associated with photosynthetic electron transfer in the cyanobacterium Synechocystis sp. PCC 6803. Detailed analyses of the mechanisms of the observed estimated pH changes in the cytosol in this alga suggested that the photosynthetic electron transfer is suppressed by the reduced plastoquinone pool under light conditions. These results indicate that Luphin may serve as a helpful tool to further illuminate pH-dependent processes throughout the photosynthetic organisms.

scholarly journals Application of heat stress in situ demonstrates a protective role of irradiation on photosynthetic performance in alpine plants

2014 ◽  
Vol 38 (4) ◽  
pp. 812-826 ◽  
Author(s):  
OTHMAR BUCHNER ◽  
MAGDALENA STOLL ◽  
MATTHIAS KARADAR ◽  
ILSE KRANNER ◽  
GILBERT NEUNER
Keyword(s):  
Heat Stress ◽  
Protective Role ◽  
Photosynthetic Performance ◽  
Alpine Plants

scholarly journals Broadcast spawning in Porites lutea at Reunion Island (Western Indian Ocean)

2019 ◽  
Vol 18 (2) ◽  
pp. 91-92
Author(s):  
Lola M. Massé ◽  
Armand Daydé ◽  
Mathieu G. Séré ◽  
Florence Trentin
Keyword(s):  
Indian Ocean ◽  
Reef Flat ◽  
Western Indian Ocean ◽  
Reunion Island ◽  
Porites Lutea ◽  
Broadcast Spawning ◽  
Shallow Reef ◽  
Réunion Island ◽  
In Situ Observations

This study report in situ observations of broadcast spawning of P. lutea on a shallow reef flat of Reunion Island.

scholarly journals The Impacts ofEx SituTransplantation on the Physiology of the Taiwanese Reef-Building CoralSeriatopora hystrix

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Anderson B. Mayfield ◽  
Tung-Yung Fan ◽  
Chii-Shiarng Chen
Keyword(s):  
Photosynthetic Performance ◽  
Light Regime ◽  
The Other ◽  
Ex Situ ◽  
Field Sampling ◽  
In Captivity ◽  
Southern Taiwan ◽  
Seriatopora Hystrix ◽  
Study Sites

We sought to determine whether the Indo-Pacific reef-building coralSeriatopora hystrixperforms in a similar manner in the laboratory as it doesin situby measuringSymbiodiniumdensity, chlorophyll a (chl-a) concentration, and the maximum quantum yield of photosystem II (FV/FM) at the time of field sampling (in situ), as well as after three weeks of acclimation and one week of experimentation (ex situ).Symbiodiniumdensity was similar between corals of the two study sites, Houbihu (an upwelling reef) and Houwan (a nonupwelling reef), and also remained at similar levelsex situasin situ. On the other hand, both areal and cell-specific chl-aconcentrations approximately doubledex siturelative toin situ, an increase that may be due to having employed a light regime that differed from that experienced by these corals on the reefs of southern Taiwan from which they were collected. As this change inSymbiodiniumchl-acontent was documented in corals of both sites, the experiment itself was not biased by this difference. Furthermore,FV/FMincreased by only 1%ex siturelative toin situ, indicating that the corals maintained a similar level of photosynthetic performance as displayedin situeven after one month in captivity.

Photosynthetic Performance of Marestail (Hippuris vulgaris Linn.) across a Water Temperature Gradient

2014 ◽  
Vol 1010-1012 ◽  
pp. 1165-1169
Author(s):  
Lin An Gao
Keyword(s):  
Water Temperature ◽  
Photosynthetic Activity ◽  
Pulse Amplitude ◽  
High Water ◽  
Photosynthetic Performance ◽  
Light Curves ◽  
Pam Fluorometry ◽  
Photosynthetic Responses ◽  
Hippuris Vulgaris

we examined the photosynthetic responses of submerged marestail in three lakes using pulse amplitude modulated (PAM) fluorometry. Three lakes were studied across a gradient of water temperature, with low water temperature conditions in Grass Lake and Arrow Bamboo Lake, and higher water temperature in Five Colored Lake. In the field, electron transport rates (ETRmax) were measured as rapid light curves (RLCs) by in situ yield measurements. Submerged marestail showed higher photosynthetic activity in Five Colored Lake compared to the other lakes, a response consistent with the adaptation of marestail in Five Colored Lake to high water temperature. The optimal temperature for photosynthesis of submerged marestail in Jiuzhaigou is about 12 °C. These results indicate that in different lakes the function of these aquatic plants is associated with a diversity of place-dependent environmental conditions, especially water temperature that leads to pronounced differences in the plant’s ecophysiological reactions.

scholarly journals EXPLAINING RARITY OF THE NARROWLY ENDEMIC DIPTEROCARPUS CF. CONDORENSIS BY IN SITU PHYSIOLOGICAL MEASUREMENTS

2011 ◽  
Vol 14 (4) ◽  
pp. 77-88
Author(s):  
Thach Buu Le ◽  
Christa Critchley
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Ground Water ◽  
Nature Reserve ◽  
Photosynthetic Performance ◽  
Essential Information ◽  
Trade Offs ◽  
Water Tables ◽  
Photosynthetic Activities

Comparative physiological attributes, obtained by chlorophyll fluorescence and gas exchange techniques, of restricted Dipterocarpus cf. condorensis and widespread Shorea roxburghii species that are actually co-located in Ta Kou Nature Reserve - Binh Thuan Province, provided essential information for understanding rarity of D. condorensis. The narrowly endemic D. condorensis had similar photosynthetic performance to the locally abundant S. roxburghii in more common habitats in which ground water tables are deep (>20m), but had significantly higher photosynthetic activities in its specific habitat, where the ground water level is shallow (<10m). These differences are probably the consequence of evolutionary trade-offs, and represent specializations of the endemic D. condorensis which is only successful in habitat where the ground water is accessible. However, while adaptive in this habitat, these traits may reduce success in other more common habitats in this region.

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