scholarly journals Qualitative growth potential test for brackish Vaucheria species

2020 ◽  
Author(s):  
Jim van Belzen
Keyword(s):  
Green Algae ◽  
Growth Conditions ◽  
Tidal Flats ◽  
Growth Potential ◽  
Filamentous Algae ◽  
Cross Contamination ◽  
Algal Mats ◽  
Qualitative Test ◽  
Potential Test ◽  
Positive Controls

Abstract The yellow-green algae _Vaucheria_ can be found on tidal flats as densely interwoven mats. Such dense mats can stabilise sediments and result in a ridge-and-runnel bedform. While _Vaucheria_ is visually covering the ridges as thick algal mats, the runnels are apparently deprived of the filamentous algae. In the present protocol I describe the procedure for sampling and testing sediments for the presence of _Vaucheria_ propagules. The method provides a qualitative test for the presence of algae propagules of _Vaucheria_ in bare sediments but is non-exclusive as also other algae \(e.g., microphytobenthos) will grow when present. To check for cross-contamination and sufficient growth conditions, appropriate negative and positive controls are implemented.

scholarly journals Growth potential can affect timing of maturity in a long-lived semelparous fish

2018 ◽  
Vol 14 (7) ◽  
pp. 20180269 ◽  
Author(s):  
Kazuki Yokouchi ◽  
Françoise Daverat ◽  
Michael J. Miller ◽  
Nobuto Fukuda ◽  
Ryusuke Sudo ◽  
...  
Keyword(s):  
Anguilla Anguilla ◽  
Growth Conditions ◽  
Growth Potential ◽  
Individual Growth ◽  
Growth Trajectories ◽  
Female Size ◽  
European Eel ◽  
Growth And Survival ◽  
Silver Eels ◽  
Reproduction Cost

Many diadromous fishes such as salmon and eels that move between freshwater and the ocean have evolved semelparous reproductive strategies, but both groups display considerable plasticity in characteristics. Factors such as population density and growth, predation risk or reproduction cost have been found to influence timing of maturation. We investigated the relationship between female size at maturity and individual growth trajectories of the long-lived semelparous European eel, Anguilla anguilla . A Bayesian model was applied to 338 individual growth trajectories of maturing migration-stage female silver eels from France, Ireland, the Netherlands and Hungary. The results clearly showed that when growth rates declined, the onset of maturation was triggered, and the eels left their growth habitats and migrated to the spawning area. Therefore, female eels tended to attain larger body size when the growth conditions were good enough to risk spending extra time in their growth habitats. This flexible maturation strategy is likely related to the ability to use diverse habitats with widely ranging growth and survival potentials in the catadromous life-history across its wide species range.

Akinete Germination and Algal Growth Potential Test of Cyanobacterium Anabaena circinalis on Different Waters in Lake Paldang

2015 ◽  
Vol 48 (4) ◽  
pp. 287-295 ◽  
Author(s):  
Myung-Hwan Park ◽  
Byung-Jin Lim ◽  
Wan-Bum Seo ◽  
Chae-Hong Park ◽  
Keon-Hee Kim ◽  
...  
Keyword(s):  
Algal Growth ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Cyanobacterium Anabaena ◽  
Potential Test ◽  
Anabaena Circinalis

scholarly journals Population structure of Carex dioica L. (Cyperaceae) in Ukraine under different growth conditions

2017 ◽  
Vol 46 (1) ◽  
pp. 19-33
Author(s):  
Svitlana Sosnovska ◽  
Ivan Danylyk
Keyword(s):  
Population Structure ◽  
Spatial Structure ◽  
Vegetative Reproduction ◽  
Optimal Growth ◽  
Spatial Arrangement ◽  
Radical Change ◽  
Growth Conditions ◽  
Growth Potential ◽  
Left Hand ◽  
Structure Of Population

Abstract The population structure of Carex dioica – a rare boggy species in Ukraine – has been studied for the first time. As a result, five types of spatial arrangement of C. dioica individuals, depending on their reproduction and living conditions, were established: scattered-diffuse, densely-diffuse, group, spotted and mosaic. Intensive vegetative propagation (often in the absence of seed reproduction) of individuals contributes to the group and spotted spatial structure of population. For low intensity of seed and vegetative reproduction, the arrangement of generative individuals turned out to be scattered-diffuse. Effective generative reproduction of a population was accompanied by a densely-diffuse distribution of individuals, and a combined type of reproduction (effective generative and vegetative) under favourable growth conditions contributes to its mosaic spatial structure. Regardless of the growth conditions, all C. dioica populations were characterised by a left-hand age spectrum which was the result of an effective vegetative renovation of individuals and a stress-tolerant type of strategy of this species. Under optimal growth conditions, the C. dioica populations were characterised by the prevalance of females compared to male ones (2:1), and under stress – a radical change in their sex ratio was observed towards a complete dominance of one of the genders. It was found that 50% of the studied C. dioica populations appeared to be thriving. Regardless of the vitality type of the population, the female individuals of this species, compared to male ones, realised their growth potential much better and, therefore, made a greater contribution to population vitality.

Algal Growth Potential Test (AGPT) in Streams and Embayment of the Okchon Stream Watershed, Korea

ALGAE ◽  
2003 ◽  
Vol 18 (2) ◽  
pp. 169-176
Author(s):  
Jae-Gi Sin ◽  
Dong-Seop Kim ◽  
Hye-Geun Lee ◽  
Seung-Jin Maeng ◽  
Sun-Jin Hwang
Keyword(s):  
Algal Growth ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Potential Test

scholarly journals Kasvutingimuste lineaarse muutumise mõju uurimine puistu kõrguse kasvukõverale simulatsioonide abil männikutes / Simulated change of stand height curves as the result of linear change of growth conditions in the case of Scotch Pine stands

2011 ◽  
Vol 55 (1) ◽  
pp. 64-79
Author(s):  
Artur Nilson
Keyword(s):  
Growth Curves ◽  
Growth Conditions ◽  
Growth Potential ◽  
Stand Age ◽  
Scotch Pine ◽  
Annual Increment ◽  
Linear Change ◽  
Stand Height ◽  
Species Specific ◽  
Future Growth

Abstract The height growth curves of Scotch Pine (Pinus sylvestris L.) stands were simulated for stands with initial height asymptote H∞ 15 m, 25 m and 35 m and with linear change p of the potency of growth conditions 0.5% yr-1, 0.2% yr-1, 0.1% yr-1 , -0.2% yr-1 and with no change as the base. Different models to transmit the changing growth potential into stand growth were used: changing the efficient length of growth year replacing the stand age t with the expression t(1 + tp) with fixed H∞ in variant (1b) or calculating the current asymptote H∞,t as the expression H∞(1 + tp) corrected for asymptotic approaching the species specific asymptote sup(H∞). Current annual increment CAI in the last case was calculated using the equations CAIt = f(t, H∞,t) in variant (3ct), CAIt = f(H, H∞,t) in variant (4ch) and CAIt = f(H, H∞,t)*(1+p/2) in variant (4chb). The height Ht in the last 3 cases was calculated as ascending sum of CAIt. Figures of the functions Ht = f(t, H∞) and CAIt = f(H, H∞) indicated the last as more informative about the changes in the shape of curves. The results of approximation of simulated curves with five different functions indicated the possibility of their modeling using traditional functions and fixed value of height asymptote. The fit was the poorest for variants 4ch and 4chb. The function for conversation the apparent growth curve based on unique height measurements into real one and vice versa was deduced for version 1b. The need to make distinct difference between the past, present and future growth in growth modeling was underlined.

scholarly journals Effect of Constructed Wetland Structure on Wastewater Treatment and Its Evaluation by Algal Growth Potential Test

2005 ◽  
Vol 41 (4) ◽  
pp. 159-170
Author(s):  
RYUHEI INAMORI ◽  
PING GUI ◽  
YASUTOSHI SHIMIZU ◽  
KAIQIN XU ◽  
KENJI KIMURA ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Algal Growth ◽  
Growth Potential ◽  
Algal Growth Potential ◽  
Potential Test

scholarly journals Нанопроволоки из сплавов FeNi и FeCo: синтез, структура и мёссбауэровские измерения

2020 ◽  
Vol 62 (9) ◽  
pp. 1474
Author(s):  
И.М. Долуденко ◽  
Д.Л. Загорский ◽  
К.В. Фролов ◽  
И.В. Перунов ◽  
M.A. Чуев ◽  
...  
Keyword(s):  
Spontaneous Magnetization ◽  
Growth Conditions ◽  
Deposition Potential ◽  
Growth Potential ◽  
X Ray Diffraction ◽  
Matrix Synthesis ◽  
X Ray ◽  
Track Membranes ◽  
Feco Alloys ◽  
First Time

Nanowires (NWs) of FeNi and FeCo alloys were obtained by matrix synthesis based on galvanic filling of pores in track membranes. The change in the elemental composition of NWs when changing the composition of the electrolyte and when changing the deposition potential was studied. The effect of anomalous co-deposition of Fe is observed in the FeNi NWs: the iron content in the NWs is noticeably higher than that in the electrolyte. This difference increases when the initial concentration increases and when the growth potential decreases. An increase in the concentration of iron at the tops of the wires was also detected. For FeCo NWs, the composition corresponds to the composition of the electrolyte and did not change much when the potential changed. X-ray diffraction analysis allowed to determine the nature of changes in the spectra when the growth conditions change. The dependence of the X - ray spectra of FeNi on the growth potential is found- the intensity of the phase peaks changes. Mössbauer measurements revealed spontaneous magnetization for all samples of NW arrays along their axes. The dependence of the value of the ultrathin magnetic field Bh f on 57Fe nuclei on the composition of NWs (FexCo1−x and FexNi1−x) was obtained for the first time. It was found that the value of Bh f decreases with an increase in the speed of the electrodeposition process (or with an increase in the value of the deposition potential U).

Food selectivity of Ceriodaphnia quadrangula (O. F. Müller, 1785) (Cladocera) and its impact on competition outcome between two freshwater green algae

Crustaceana ◽  
2013 ◽  
Vol 86 (13-14) ◽  
pp. 1550-1563
Author(s):  
A. Tellioglu
Keyword(s):  
Green Algae ◽  
Relative Abundance ◽  
Chlorella Vulgaris ◽  
Cell Walls ◽  
Algal Species ◽  
Optimal Foraging Theory ◽  
Food Selectivity ◽  
Growth Potential ◽  
Ceriodaphnia Quadrangula ◽  
Lower Limits

The present work tested the food selectivity of the cladoceran Ceriodaphnia quadrangula (O. F. Müller, 1785) and its impact on competition outcome between Chlorella vulgaris Beijerinck, 1890 and Chlamydomonas globosa J. W. Snow, 1902. Freshwater green algae, Chlorella, have heavy cell walls and their size usually exceeds the lower limits of limb size of Ceriodaphnia. According to the optimal foraging theory, it is speculated that Ceriodaphnia would graze on the more exposed and relatively larger Chlamydomonas rather than on Chlorella, and this process would lead to small-sized Chlorella becoming a superior competitor in the presence of Ceriodaphnia. This work used Ceriodaphnia, Chlamydomonas globosa and Chlorella vulgaris to test this hypothesis. The grazing experiment showed that Ceriodaphnia preferred Chl. globosa to Ch. vulgaris, regardless of the concentration and relative abundance of these algae. The decrease in relative abundance of high-quality Chlamydomonas in Chlamydomonas-Chlorella assemblages did not diminish the grazing efficiency of Ceriodaphnia on this algal species, but increased the selectivity of small-sized cells of Chlorella. However, when the concentration of Chlamydomonas was extremely high, the grazing of Ceriodaphnia on Chlamydomonas decreased. In competition experiments, it was observed that the presence of Chlamydomonas restrained the growth potential of Chlorella; however, the introduction of Ceriodaphnia into the competing environment weakened this influence and to some extent enhanced the growth ability of Chlorella. The different densities of Ceriodaphnia had an obvious influence on the competition outcome between Chlamydomonas and Chlorella.

Clostridium botulinum type E occurs and grows in the alga Cladophora glomerata

2009 ◽  
Vol 66 (6) ◽  
pp. 879-882 ◽  
Author(s):  
Muruleedhara N. Byappanahalli ◽  
Richard L. Whitman
Keyword(s):  
Clostridium Perfringens ◽  
Green Algae ◽  
Spore Germination ◽  
Clostridium Botulinum ◽  
Lake Michigan ◽  
Cladophora Glomerata ◽  
Algal Mats ◽  
E Gene ◽  
Botulinum Type ◽  
Clostridium Botulinum Type E

In recent years, massive avian die-offs from Clostridium botulinum type E infection have occurred in the Sleeping Bear Dunes National Lakeshore (SLBE) area of Lake Michigan. These outbreaks have been coincidental with massive blooms of the green algae Cladophora , mostly Cladophora glomerata . We tested the hypothesis that Clostridium botulinum type E can grow under suitable conditions in these algal mats. In a lab mesocosm study, Cladophora from four outbreak-impacted beaches from SLBE were compared with four unimpacted beaches in the Milwaukee–Racine area for bontE gene of Clostridium botulinum. Frequency of the bontE gene was higher after incubation (25 °C for up to 6 weeks) of Cladophora from impacted vs. the unimpacted area. Since no type E gene was detected initially in Cladophora from any of the eight locations, we infer that the increased occurrence of type E gene arose from spore germination or vegetative Clostridium growth within the existing algal mats of SLBE. Moreover, we found that the congener Clostridium perfringens readily grows in mesocosms containing Cladophora.

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