Annual Growth Rings and Rate of Growth of the Giant Scallop, Placopecten magellanicus (Gmelin) in the Digby Area of the Bay of Fundy

1954 ◽  
Vol 11 (5) ◽  
pp. 660-671 ◽  
Author(s):  
J. A. Stevenson ◽  
L. M. Dickie
Keyword(s):  
Growth Curve ◽  
Growth Ring ◽  
Annual Growth ◽  
Bay Of Fundy ◽  
Placopecten Magellanicus ◽  
Growth Rings ◽  
Rate Of Growth ◽  
Special Collections ◽  
General Growth ◽  
Annual Growth Rings

The growth rings on the valves of scallops collected from the Digby area of the Bay of Fundy are formed only once a year during the winter. Observations of special collections of small scallops have also shown the position of the first growth ring. This information has been used to construct a general growth curve from measurements of annuli on scallops from the Digby area.

The Effect of Growth Rate on the Structure and Compressive Properties of Cork

IAWA Journal ◽  
1992 ◽  
Vol 13 (4) ◽  
pp. 389-396 ◽  
Author(s):  
Helena Pereira ◽  
José Graça ◽  
Cecília Baptista
Keyword(s):  
Growth Rate ◽  
Growth Ring ◽  
Annual Growth ◽  
Compressive Properties ◽  
Growth Rings ◽  
Lower Strength ◽  
Young’S Moduli ◽  
Annual Growth Ring ◽  
Annual Growth Rings ◽  
Cell Dimensions

Cork samples with an age of 9 years and with different growth rates, corresponding to calibre classes 'small', 'medium' and 'large', were observed by scanning electron microscopy and tested mechanically in compression. Differences in calibre correspond to different widths of annual growth rings; widths differ because both the number of cells produced per year and cell dimensions differ. For instance, small and large calibre cork had, respectively, 50 and 151 cells in one row of an annual growth ring, with an average prism height of 32.6 and 39.8 )µm. The stress-strain curves obtained in compression parallel to the three main directions showed that cork with the higher growth rate (large calibre) has lower strength in compression for all strains and lower Young's moduli.

scholarly journals The age and growth of the scallop, Pecten maximus (L.), in Manx waters

1957 ◽  
Vol 36 (3) ◽  
pp. 473-492 ◽  
Author(s):  
James Mason
Keyword(s):  
Shallow Water ◽  
Growth Curve ◽  
Growth Ring ◽  
Great Majority ◽  
Annual Growth ◽  
Age And Growth ◽  
Pecten Maximus ◽  
Growth Rings ◽  
Annual Growth Ring ◽  
Spawning Periods

Growth-rings on the shell of the scallop (Pecten maximus) are laid down annually, in spring, and so can be used to determine the age.Scallops grow from spring to December, and cease growing in winter. The resumption of growth in the spring is marked by the appearance of the annual growth-ring at the edge of the shell.The first year's growth is of one of two types. A few scallops have shells which show a large first year's growth, 28 mm or more wide, while the great majority have shells which show a small first year's growth, less than 28 mm wide. These two types probably depend on the two principal spawning periods of the scallop, most of the former arising from the spring spawning and most of the latter from the autumn one.The growth curve of P. maximus is of a type characteristic of lamellibranch shells. The annual growth is greatest in the first two or three years of life, after which it decreases steadily.Scallops grow more quickly in shallow water than in deeper water.Possible causes of the annual cessation of growth are discussed.A paucity of young scallops was noted in the dredge samples, as previous workers have reported. No reason can be given.

PERTUMBUHAN LINGKARAN POHON JATI PADA DUA SISTEM KULTUR BERBEDA DI JAWA TIMUR

2008 ◽  
Vol 6 (2) ◽  
Author(s):  
Iriwi Louisa S. Sinon
Keyword(s):  
Tree Ring ◽  
Tectona Grandis ◽  
Annual Growth ◽  
Natural Growth ◽  
Growth Rings ◽  
Climate Effect ◽  
Tropical Regions ◽  
Annual Growth Rings ◽  
Chronological Sequence ◽  
Plantation Teak

<p><em>Study dendrochronology or tree-ring dating is defined as the study of chronological sequence of annual growth rings in trees. Teak (Tectona grandis) is one of various tree species that has been identified for the use of tree-ring studies in tropical regions. Teak is found to be suitable for dendrochronology as it is long-lived and develops defined annual growth rings. In Java, teak cans growth naturally or intensively in plantation. The two silviculture conditions will give different sensitivity on climate effect. Therefore, the effect of silviculturer will on natural teak and plantation teak in Saradan, Madiun, and East Java. As a part of the study, ten core samples from natural- growth teak were measured. The samples of growth rings is spanned from 1832 – 2004. Using the COFECHA program, the correlation of the samples (r) was found to be 0.44 point, which is satisfactory to the standard used in dendrochronology. Thus, from this study it can be concluded that natural teak could still be used in dendrochronology, although the sensitivity are not as high as plantation teak. </em></p>

Magnetic resonance imaging of wood

1986 ◽  
Vol 16 (2) ◽  
pp. 423-426 ◽  
Author(s):  
Laurance D. Hall ◽  
Vasanthan Rajanayagam ◽  
Wendy A. Stewart ◽  
Paul R. Steiner
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Structural Features ◽  
Annual Growth ◽  
Resonance Imaging ◽  
Growth Rings ◽  
Magnetic Resonance Scanner ◽  
Annual Growth Rings ◽  
Do So

A magnetic resonance scanner has been used to obtain images at 0.14 T, based on the water in aspen (Populustremuloides Michx.). In addition to visualization of the expected structural features such as annual growth-rings and knots, several additional features appear that require further study. Kiln-dried wood does not contain sufficient water to give an image, but can do so after impregnation with water.

Annual growth rings in the mangrove Laguncularia racemosa (Combretaceae)

Trees ◽  
2008 ◽  
Vol 22 (5) ◽  
pp. 663-670 ◽  
Author(s):  
Gustavo Calderucio Duque Estrada ◽  
Cátia Henriques Callado ◽  
Mário Luiz Gomes Soares ◽  
Cláudio Sérgio Lisi
Keyword(s):  
Annual Growth ◽  
Laguncularia Racemosa ◽  
Growth Rings ◽  
Annual Growth Rings

Management implications of annual growth rings in Pterocarpus angolensis from Zimbabwe

1999 ◽  
Vol 124 (2-3) ◽  
pp. 217-229 ◽  
Author(s):  
D.W Stahle ◽  
P.T Mushove ◽  
M.K Cleaveland ◽  
F Roig ◽  
G.A Haynes
Keyword(s):  
Annual Growth ◽  
Growth Rings ◽  
Management Implications ◽  
Pterocarpus Angolensis ◽  
Annual Growth Rings
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