scholarly journals Seasonal changes in the biochemical fate of carbon fixed by benthic diatoms in intertidal sediments

2017 ◽  
Vol 63 (2) ◽  
pp. 550-569 ◽  
Author(s):  
Tanja C. W. Moerdijk-Poortvliet ◽  
Peter van Breugel ◽  
Koen Sabbe ◽  
Olivier Beauchard ◽  
Lucas J. Stal ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Benthic Diatoms ◽  
Intertidal Sediments

Biogenic Stabilization of Intertidal Sediments: The Importance of Extracellular Polymeric Substances Produced by Benthic Diatoms

2005 ◽  
Vol 49 (4) ◽  
pp. 501-512 ◽  
Author(s):  
J.F.C. de Brouwer ◽  
K. Wolfstein ◽  
G.K. Ruddy ◽  
T.E.R. Jones ◽  
L.J. Stal
Keyword(s):  
Extracellular Polymeric Substances ◽  
Benthic Diatoms ◽  
Intertidal Sediments

Impacts of Flounder Trawls on the Intertidal Habitat and Community of the Minas Basin, Bay of Fundy

1994 ◽  
Vol 51 (3) ◽  
pp. 650-661 ◽  
Author(s):  
Michael Brylinsky ◽  
Jamie Gibson ◽  
Donald C. Gordon Jr.
Keyword(s):  
Intertidal Zone ◽  
Benthic Diatoms ◽  
Bay Of Fundy ◽  
Intertidal Habitat ◽  
Intertidal Sediments ◽  
Surficial Sediments ◽  
Biological Impacts

Four experimental trawls were made at highwater over the intertidal zone of the Minas Basin and the effects assessed when the tide was out to determine the physical and biological impacts of groundfish trawling on the benthos. The trawl doors made furrows 30–85 cm wide and up to 5 cm deep. The rollers compressed surficial sediments but did not scour a depression. The bridle caused no obvious disturbance. Door furrows and roller marks remained visible for 2–7 mo. No significant impacts were observed on either benthic diatoms or macrobenthos. The macrobenthos was dominated by polychaetes, some of which may have the ability to take evasive action as a trawl approaches. There were few molluscs, crustaceans, or echinoderms present; these taxa have been shown to be more susceptible to trawling damage in studies done elsewhere. Nematode numbers were initially depressed in the door furrows but did recover with time. It is not known whether nematodes were killed or displaced but the latter is thought more likely. Overall, the impacts in this particular environment are judged to be minor, especially since the intertidal sediments of the Minas Basin are already exposed to similar natural stresses imposed by storms and winter ice.

scholarly journals Optimising extraction of extracellular polymeric substances (EPS) from benthic diatoms: comparison of the efficiency of six EPS extraction methods

2009 ◽  
Vol 60 (12) ◽  
pp. 1201 ◽  
Author(s):  
Eri Takahashi ◽  
Jérôme Ledauphin ◽  
Didier Goux ◽  
Francis Orvain
Keyword(s):  
Extracellular Polymeric Substances ◽  
Cell Lysis ◽  
Extraction Methods ◽  
Benthic Diatoms ◽  
Universal Method ◽  
Intertidal Sediments ◽  
Electronic Microscopy ◽  
Glucose Content ◽  
Diatom Culture ◽  
High Yields

There is no universal method that can be applied to extract bound extracellular polymeric substances (EPS) from benthic diatoms of intertidal sediments without causing cell lysis. Six extraction methods were tested on a diatom culture of Navicula jeffreyi to establish the best compromise between high yields of carbohydrate extraction and minimum cell lysis. Extraction with distilled water provoked cell lysis (as already known). The five other extraction methods (dowex resin, artificial seawater of half salinity and extractions after pretreatment with gluteraldehyde by three methods: water, dowex water and dowex buffer) did not provoke cell lysis as shown by transmission electronic microscopy. This result was confirmed by the minimum release of internal compounds (protein, ATP) and by the low proportions of glucose in dowex-extracted EPS compared with the water-extracted EPS, from which the high glucose content must be inferred as contamination by the chrysolaminaran. The extraction with dowex resin resulted in the second-highest concentration of carbohydrate after the water extraction and the EPS were especially rich in deoxy sugars, hence increasing the hydrophobic feature of these substances. For these reasons, we recommend extraction with dowex, which is also the best method for extracting bound EPS from other biofilms such as in activated sludges.

Spreading the Word: Seasonal Changes Mean New Opportunities for Media Coverage

ASHA Leader ◽  
2013 ◽  
Vol 18 (7) ◽  
Keyword(s):  
Media Coverage ◽  
Seasonal Changes ◽  
Swimming Pools

Summer kicking into high gear conjures images of swimming pools and barbeques. But before you book your beach house for the weekend, think about what the changing seasons can mean for you professionally.

Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus

2002 ◽  
Vol 76 (2) ◽  
pp. 237-245 ◽  
Author(s):  
JONAS ORNBORG ◽  
STAFFAN ANDERSSON ◽  
SIMON C. GRIFFITH ◽  
BEN C. SHELDON
Keyword(s):  
Seasonal Changes ◽  
Parus Caeruleus ◽  
Structural Colour ◽  
Blue Tits ◽  
Colour Signal

Seasonal changes in nitrogen fractions of Pachysandra terminalis, a forest evergreen chamaephyte

1990 ◽  
Vol 79 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Fumio Yoshie ◽  
Hirohito Arai ◽  
Hideaki Nakashima ◽  
Shoichi Kawano
Keyword(s):  
Seasonal Changes ◽  
Nitrogen Fractions

Seasonal changes in phytoplankton community structure in a bioluminescent lagoon, St. Croix, US Virgin Islands

2018 ◽  
Vol 81 (2) ◽  
pp. 109-124 ◽  
Author(s):  
JL Pinckney ◽  
C Tomas ◽  
DI Greenfield ◽  
K Reale-Munroe ◽  
B Castillo ◽  
...  
Keyword(s):  
Community Structure ◽  
Seasonal Changes ◽  
Phytoplankton Community ◽  
Virgin Islands ◽  
Phytoplankton Community Structure ◽  
Us Virgin Islands
Sign in / Sign up

Export Citation Format

Share Document