Growth Rates, Age Determination, and Calcification Levels in Flustra foliacea (L.) (Bryozoa: Cheilostomata): Preliminary Assessment

2012 ◽  
pp. 59-74 ◽  
Author(s):  
Helena Fortunato ◽  
Priska Schäfer ◽  
Heidi Blaschek
Keyword(s):  
Growth Rates ◽  
Age Determination ◽  
Preliminary Assessment ◽  
Flustra Foliacea

How Old are Tropical Trees? the Persistence of a Myth

IAWA Journal ◽  
1999 ◽  
Vol 20 (3) ◽  
pp. 255-260 ◽  
Author(s):  
Martin Worbes ◽  
Wolfgang Johannes Junk
Keyword(s):  
South America ◽  
Growth Rates ◽  
Age Determination ◽  
Tropical Trees ◽  
Pioneer Species ◽  
Annual Rings ◽  
Hollow Trees ◽  
Cariniana Legalis ◽  
Direct Counting ◽  
Age Determinations

The recent report of ancient trees in the Amazon region (Chambers et al. 1998) with a maximum radiocarbon dated age of about 1400 years for the long-living pioneer species Cariniana micrantha is discussed in the light of dendrochronological age determinations from Africa and South America together with the results of indirect age estimations from other sources. There is a tendency in the literature to considerably overestimate the maximum ages of tropical trees. Age determination by the direct counting of annual rings and making estimations for hollow trees by measuring growth rates and diameters result in ages between 400 and 500 years for the largest trunk dimensions, e.g. in Cariniana legalis.

Daily Growth Rates as Indicated by Valve Ridges in Postlarval Giant Scallop (Placopecten magellanicus) (Bivalvia: Pectinidae)

1993 ◽  
Vol 50 (3) ◽  
pp. 456-464 ◽  
Author(s):  
G. Jay Parsons ◽  
Shawn M. C. Robinson ◽  
John C. Roff ◽  
Michael J. Dadswell
Keyword(s):  
Growth Rates ◽  
Larval Fish ◽  
Shell Height ◽  
Age Determination ◽  
Growth Patterns ◽  
Placopecten Magellanicus ◽  
Short Term ◽  
Daily Growth ◽  
Alizarin Red ◽  
Growth Increments

Postlarval giant scallop (Placopecten magellanicus) were examined for daily growth ridges and growth rates by marking the dissoconch shell with Alizarin red dye. The surface of the left valve of postlarvae was composed of concentric ridges, each consisting of a series of irregularly shaped raised nodules. Ridges were clear and distinct in newly settled scallop between ≈0.25 and 2.0 mm shell height. The shell of postlarvae >2 mm was pigmented and ribbed and ridges were no longer distinguishable. Estimated age was significantly correlated with actual age, suggesting that growth ridges were produced daily, under the environmental conditions of Passamaquoddy Bay. Mean growth rate ranged from 32 to 57 μm∙d−1 and was proportional to size and age, but growth of individual scallop showed no coherence in their daily growth patterns. The short-term growth ridges in postlarval giant scallop can be used to determine age and can be applied to comparative growth, mortality, and recruitment studies of newly settled individuals <2.0 mm (≈40 d old postsettlement). The high accuracy and precision of age determination for postlarval scallop differs from studies of short-term internal growth increments of bivalve shells and larval fish otoliths.

scholarly journals Preliminary Assessment of Growth Rates on Different Concentration of Microalgae Scenedesmus sp. in Industrial Meat Food Processing Wastewater

2017 ◽  
Vol 103 ◽  
pp. 06010 ◽  
Author(s):  
Nur Atikah Ahmad Latiffi ◽  
Radin Maya Saphira Radin Mohamed ◽  
Najeeha Mohd Apandi ◽  
Ramlah Mohd Tajuddin
Keyword(s):  
Growth Rates ◽  
Food Processing ◽  
Preliminary Assessment ◽  
Food Processing Wastewater

Age determination and growth of the freshwater catfish, Tandanus tandanus Mitchell, in the Gwydir River, Australia

1977 ◽  
Vol 28 (2) ◽  
pp. 119 ◽  
Author(s):  
TLO Davis
Keyword(s):  
Growth Rates ◽  
Age Determination ◽  
Maximum Size ◽  
Von Bertalanffy ◽  
Freshwater Catfish ◽  
Growth Equations ◽  
Males And Females ◽  
June July

Dorsal spines of T. tandanus from the Gwydir River were used for age determination. Annuli were formed in winter (June-July). The validity of age determination and accuracy of lengths back- calculated from spine radius measurements were supported by tagging data and examination of known age fish. No differences in growth rates were detected between males and females. The variation in growth from season to season was not great. The von Bertalanffy and Gompertz growth equations were used to describe growth in length and weight respectively. The maximum size of catfish in the Gwydir River predicted by these equations was 596 mm and 2605 g.

scholarly journals Preliminary assessment of a direct age determination method for 3 commercially important crustaceans from Alaska

2016 ◽  
Vol 115 (1) ◽  
pp. 42-49 ◽  
Author(s):  
Raouf Kilada ◽  
Joel B. Webb ◽  
Kevin W. McNeel ◽  
Laura M. Slater ◽  
Quinn Smith ◽  
...  
Keyword(s):  
Age Determination ◽  
Determination Method ◽  
Preliminary Assessment ◽  
Commercially Important

Procedure for Maximizing Phonological Information from Single-Word Responses

1984 ◽  
Vol 15 (4) ◽  
pp. 267-274 ◽  
Author(s):  
Harriet B. Klein
Keyword(s):  
Phonological Information ◽  
Single Word ◽  
Preliminary Assessment ◽  
Target Attainment ◽  
Phonological Processes ◽  
Step Procedure ◽  
Yield Information ◽  
Assessment Measure ◽  
Busy Clinician ◽  
Planning Intervention

Formal articulation test responses are often used by the busy clinician as a basis for planning intervention goals. This article describes a 6-step procedure for using efficiently the single-word responses elicited with an articulation test. This procedure involves the assessment of all consonants within a word rather than only test-target consonants. Responses are organized within a Model and Replica chart to yield information about an individual's (a) articulation ability, (b) frequency of target attainment, substitutions, and deletions, (c) variability in production, and (d) phonological processes. This procedure is recommended as a preliminary assessment measure. It is advised that more detailed analysis of continuous speech be undertaken in conjunction with early treatment sessions.

Sign in / Sign up

Export Citation Format

Share Document