scholarly journals Estimation of growth parameters of male blue crabs Callinectes arcuatus (Brachyura: Portunidae) from the Gulf of California using the Schnute model

2016 ◽  
Vol 44 (2) ◽  
pp. 371-379 ◽  
Author(s):  
Gilberto G. Ortega Lizarraga ◽  
Guillermo Rodriguez Dominguez ◽  
Raul Perez Gonzalez ◽  
Nicolas Castaneda Lomas ◽  
E. Alberto Aragon Noriega
Keyword(s):  
Gulf Of California ◽  
Growth Parameters ◽  
Blue Crabs ◽  
Schnute Model

Using length data in the Schnute Model to describe growth in a metapenaeid from waters off Australia

2010 ◽  
Vol 61 (12) ◽  
pp. 1435 ◽  
Author(s):  
Steven S. Montgomery ◽  
Chris T. Walsh ◽  
Malcolm Haddon ◽  
Caitlin L. Kesby ◽  
Daniel D. Johnson
Keyword(s):  
Growth Parameters ◽  
Maximum Size ◽  
Growth Function ◽  
Novel Approach ◽  
Von Bertalanffy Growth Function ◽  
Female Data ◽  
Fitting Length ◽  
Schnute Model ◽  
Length Data ◽  
Best Fit

This paper presents a novel approach for fitting length data to the Schnute growth model. Cohorts were fitted manually to a time series of length distributions from two stocks (Clarence and Hunter Rivers) of Metapenaeus macleayi and considered analogous to individuals from tag–recapture data, in order to estimate growth parameters. Data for Clarence males best fitted the three-parameter Schnute Model (L∞ = 21.3 mm CL, κ = 0.025 day–1 and γ = –1.35), whereas those for Hunter males were best fitted to a two-parameter version of the model (L∞ = 33.5 mm CL, κ = 0.009 day–1 and γ = 0 fixed). The equivalent to the von Bertalanffy growth function was the best fit to female data from both stocks (L∞ = 36.6 and 40.2 mm CL, κ = 0.004 and 0.005 day–1 and γ = 1 fixed for Clarence and Hunter respectively). Females grew larger than males and took longer to achieve their maximum size. No significant differences in female growth were found between stocks; however, males from the Hunter grew to a longer mean maximum length but at a slower rate than those from the Clarence. This study shows how the Schnute Model can be fitted to length based data and thus include the flexibility of comparing fits between asymptotic and non-asymptotic growth functions.

scholarly journals Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California

2015 ◽  
Vol 12 (22) ◽  
pp. 18795-18827 ◽  
Author(s):  
R. A. Cabral-Tena ◽  
A. Sánchez ◽  
H. Reyes-Bonilla ◽  
A. H. Ruvalcaba-Díaz ◽  
E. F. Balart
Keyword(s):  
Gulf Of California ◽  
Growth Parameters ◽  
Isotope Composition ◽  
Seasonal Pattern ◽  
Carbon Isotopic Composition ◽  
Coral Growth ◽  
Metabolic Effects ◽  
Published Data ◽  
Isotope Record ◽  
Δ18o And Δ13c

Abstract. Coral δ18O variations are used as a proxy for changes in near sea surface temperature and seawater isotope composition. Skeletal δ13C of coral is frequently used as a proxy for solar radiation because most of its variability is controlled by an interrelationship between three processes: photosynthesis, respiration, and feeding. Coral growth rate is known to influence the δ18O and δ13C isotope record to a lesser extent. Recent published data show differences in growth parameters between female and male coral; thus, skeletal δ18O and δ13C are hypothesized to be different in each sex. To assess this difference, this study describes changes in the skeletal δ18O and δ13C record of four female and six male Porites panamensis coral collected in Bahía de La Paz, whose growth bands spanned 12 years. The isotopic data were compared to SST, precipitation, PAR, chlorophyll a, and skeletal growth parameters. Porites panamensis is a known gonochoric brooder whose growth parameters are different in females and males. Splitting the data by sexes explained 81 and 93 % of the differences of δ18O, and of δ13C, respectively, in the isotope record between colonies. Both isotope records were different between sexes. δ18O was higher in female colonies than in male colonies, with a 0.31 ‰ difference; δ13C was lower in female colonies, with a 0.28 ‰ difference. A difference in the skeletal δ18O implies an error in SST estimates of &amp;approx; 1.0 °C to &amp;approx; 2.6 °C. The δ18O records showed a seasonal pattern that corresponded to SST, with low correlation coefficients (−0.45, −0.32), and gentle slopes (0.09 ‰ °C−1, 0.10 ‰ °C−1) of the δ18O–SST relation. Seasonal variation in coral δ18O represents only 52.37 and 35.66 % of the SST cycle; 29.72 and 38.53 % can be attributed to δ18O variability in seawater. δ13C data did not correlate with any of the environmental variables; therefore, variations in skeletal δ13C appear to be driven mainly by metabolic effects. Our results support the hypothesis of a sex-associated difference in skeletal δ18O and δ13C signal, and suggest that environmental conditions and coral growth parameters affect skeletal isotopic signal differently in each sex.

scholarly journals Age and growth of thread herring Opisthonema libertate, in the southern Gulf of California

2020 ◽  
Vol 48 (1) ◽  
pp. 15-22
Author(s):  
Jorge Payan-Alejo ◽  
Mercedes L. Jacob-Cervantes ◽  
Guillermo Rodríguez-Domínguez
Keyword(s):  
Environmental Conditions ◽  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Age Groups ◽  
Reproductive Period ◽  
Age And Growth ◽  
Chl A ◽  
Pooled Data ◽  
Schnute Model

To fit a growth model to Opisthonema libertate, the most common thread herring in a small pelagic fishery in the southern Gulf of California, size data of commercial landings and age were generated from sagittal otoliths assessed during three different years, 2005, 2008 and 2015, representing Neutral, La Niña and El Niño environmental conditions, respectively. A multimodel select approach on five special submodels of generalized Schnute model, including one, equivalent to the Von Bertalanffy model, were used. A total of 573 otoliths were analyzed; 219 from Neutral, 149 from El Niño and 205 from The Niña events. An opaque zone of otoliths formed in winter-spring when chlorophyll a (Chl-a) concentrations were at a maximum. However, a hyaline zone of otoliths formed during the summer of the reproductive period. Schnute submodel 1 was the best model selected in all three environmental conditions, but submodel 3 was the best on pooled data. Length of thread herring aged 0.5 years old in the El Niño year was lower than other environmental-years analyzed. A possible compensatory effect on growth with age was observed in the data because environmental conditions affected the growth of 0.5-year-old thread herring, as was evident in size variance in this age group under all three conditions, but variance decreased in the older age groups. Thus, a multimodel average of Schnute submodels 1 and 3 could be used to describe the growth of O. libertate in the southern Gulf of California.

Growth curves of the yellowlegs shrimp Penaeus californiensis Holmes, 1900 (Decapoda, Penaeidae), using length data

Crustaceana ◽  
2020 ◽  
Vol 93 (9-10) ◽  
pp. 1103-1121
Author(s):  
Luis A. Félix-Salazar ◽  
E. Alberto Aragón-Noriega ◽  
Guillermo Rodríguez-Domínguez ◽  
Wenceslao Valenzuela-Quiñónez ◽  
Ana M. Arroyo-Bustos ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Coastal Lagoons ◽  
Age Groups ◽  
Growth Curves ◽  
Growth Function ◽  
Average Growth ◽  
Von Bertalanffy Growth Function ◽  
Female Data ◽  
Schnute Model ◽  
Oceanic Species

Abstract The yellowlegs shrimp Penaeus californiensis is an oceanic species that approaches the coastal zone for its reproduction. However, in the southern Gulf of California, this species also enters coastal lagoons to grow and reproduce. To test the hypothesis that the growth of P. californiensis differs between these two environments, monthly samplings of shrimp were made in the interior of the Navachiste coastal lagoon and its adjacent marine area. To determine growth, age groups were identified using the size structures over time. Five cases of the Schnute model were adjusted to the data, and the best case was selected using a multi-model selection approach. A sigmoid-shaped curve best represented the female data (case 2), and the inverted exponential curve (case 5; equivalent to the Von Bertalanffy growth function) was best for males. Average growth differed between sexes () but not between environments ().

Population parameters and size at maturity of Callinectes arcuatus Ordway, 1863 (Decapoda, Portunidae) in Apozahualco Lagoon, Guerrero, Mexico

Crustaceana ◽  
2019 ◽  
Vol 92 (4) ◽  
pp. 397-414
Author(s):  
Jesús G. Padilla-Serrato ◽  
J. Gabriel Kuk-Dzul ◽  
Pedro Flores-Rodríguez ◽  
Rafael Flores-Garza ◽  
Nader Soriano-Reyes
Keyword(s):  
Coastal Lagoon ◽  
Performance Index ◽  
Gulf Of California ◽  
Fishery Management ◽  
Size Structure ◽  
Growth Parameters ◽  
Size At Maturity ◽  
Population Parameters ◽  
Mexican Pacific ◽  
Frequency Distributions

Abstract The objectives of this study were, to determine the population parameters of size structure, growth, cohorts, and recruitment for Callinectes arcuatus Ordway, 1863, as well as the size at maturity for females. We sampled each fortnight from September 2008 to February 2009 in the coastal lagoon Apozahualco, Guerrero, Mexico. Analysis of size frequency distributions showed three (September) and four (December) cohorts of juveniles. Estimated growth parameters were and , and the phi-prime growth performance index () was 4.2. Recruitment had the highest values during August and September. The size at maturity for females was 72 mm. In conclusion, values of for C. arcuatus were higher in the southern Mexican Pacific (SMP) than in the Gulf of California (GC); and this size at maturity for females followed a decreasing pattern from SMP to GC. These results are essential for fishery management of C. arcuatus in the SMP and GC.

Estimation of Individual Growth Parameters of the Cortes GeoduckPanopea globosafrom the Central Gulf of California using a Multimodel Approach

2012 ◽  
Vol 31 (3) ◽  
pp. 725-732 ◽  
Author(s):  
Rolando Cruz-Vásquez ◽  
Guillermo Rodríguez-Domínguez ◽  
Edgar Alcántara-Razo ◽  
Eugenio Alberto Aragón-Noriega
Keyword(s):  
Gulf Of California ◽  
Growth Parameters ◽  
Individual Growth

scholarly journals Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California

2016 ◽  
Vol 13 (9) ◽  
pp. 2675-2687 ◽  
Author(s):  
Rafael A. Cabral-Tena ◽  
Alberto Sánchez ◽  
Héctor Reyes-Bonilla ◽  
Angel H. Ruvalcaba-Díaz ◽  
Eduardo F. Balart
Keyword(s):  
Environmental Variables ◽  
Gulf Of California ◽  
Growth Parameters ◽  
Isotope Composition ◽  
Carbon Isotopic Composition ◽  
Coral Growth ◽  
Metabolic Effects ◽  
Published Data ◽  
Isotope Record ◽  
Δ18o And Δ13c

Abstract. Coral δ18O variations are used as a proxy for changes in sea surface temperature (SST) and seawater isotope composition. Skeletal δ13C of coral is frequently used as a proxy for solar radiation because most of its variability is controlled by an interrelationship between three processes: photosynthesis, respiration, and feeding. Coral growth rate is known to influence the δ18O and δ13C isotope record to a lesser extent than environmental variables. Recent published data show differences in growth parameters between female and male coral in the gonochoric brooding coral Porites panamensis; thus, skeletal δ18O and δ13C are hypothesized to be different in each sex. To test this, this study describes changes in the skeletal δ18O and δ13C record of four female and six male Porites panamensis coral collected in Bahía de La Paz, Mexico, whose growth bands spanned 12 years. The isotopic data were compared to SST, precipitation, photosynthetically active radiation (PAR), chlorophyll a, and skeletal growth parameters. Porites panamensis is a known gonochoric brooder whose growth parameters are different in females and males. Splitting the data by sexes explained 81 and 93 % of the differences of δ18O, and of δ13C, respectively, in the isotope record between colonies. Both isotope records were different between sexes. δ18O was higher in female colonies than in male colonies, with a 0.31 ‰ difference; δ13C was lower in female colonies, with a 0.28 ‰ difference. A difference in the skeletal δ18O could introduce an error in SST estimates of  ≈  1.0 to  ≈  2.6 °C. The δ18O records showed a seasonal pattern that corresponded to SST, with low correlation coefficients (−0.45, −0.32), and gentle slopes (0.09, 0.10 ‰ °C−1) of the δ18O–SST relation. Seasonal variation in coral δ18O represents only 52.37 and 35.66 % of the SST cycle; 29.72 and 38.53 % can be attributed to δ18O variability in seawater. δ13C data did not correlate with any of the environmental variables; therefore, variations in skeletal δ13C appear to be driven mainly by metabolic effects. Our results support the hypothesis of a sex-associated difference in skeletal δ18O and δ13C signal, and suggest that environmental conditions and coral growth parameters affect skeletal isotopic signals differently in each sex. Although these findings relate to one gonochoric brooding species, they may have some implications for the more commonly used gonochoric spawning species such as Porites lutea and Porites lobata.

scholarly journals Using Observed Residual Error Structure Yields the Best Estimates of Individual Growth Parameters

Fishes ◽  
2021 ◽  
Vol 6 (3) ◽  
pp. 35
Author(s):  
Marcelo V. Curiel-Bernal ◽  
E. Alberto Aragón-Noriega ◽  
Miguel Á. Cisneros-Mata ◽  
Laura Sánchez-Velasco ◽  
S. Patricia A. Jiménez-Rosenberg ◽  
...  
Keyword(s):  
Fish Species ◽  
Gulf Of California ◽  
Growth Parameters ◽  
Growth Models ◽  
Growth Parameter ◽  
Individual Growth ◽  
Von Bertalanffy ◽  
Error Structure ◽  
Endangered Fish ◽  
Constant Variance

Obtaining the best possible estimates of individual growth parameters is essential in studies of physiology, fisheries management, and conservation of natural resources since growth is a key component of population dynamics. In the present work, we use data of an endangered fish species to demonstrate the importance of selecting the right data error structure when fitting growth models in multimodel inference. The totoaba (Totoaba macdonaldi) is a fish species endemic to the Gulf of California increasingly studied in recent times due to a perceived threat of extinction. Previous works estimated individual growth using the von Bertalanffy model assuming a constant variance of length-at-age. Here, we reanalyze the same data under five different variance assumptions to fit the von Bertalanffy and Gompertz models. We found consistent significant differences between the constant and nonconstant error structure scenarios and provide an example of the consequences using the growth performance index ϕ′ to show how using the wrong error structure can produce growth parameter values that can lead to biased conclusions. Based on these results, for totoaba and other related species, we recommend using the observed error structure to obtain the individual growth parameters.

Studies of Ge/Si(100) and Observation of Atomic Steps on Si(100) using Biassed Secondary Electron Imaging in a UHV STEM

1990 ◽  
Vol 48 (1) ◽  
pp. 308-309
Author(s):  
Mohan Krishnamurthy ◽  
Jeff S. Drucker ◽  
John A. Venablest
Keyword(s):  
Secondary Electron ◽  
Critical Thickness ◽  
Surface Defects ◽  
Film Growth ◽  
Growth Parameters ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Surface Steps ◽  
Epitaxial Crystal Growth ◽  
Electron Imaging

Secondary Electron Imaging (SEI) has become a useful mode of studying surfaces in SEM[1] and STEM[2,3] instruments. Samples have been biassed (b-SEI) to provide increased sensitivity to topographic and thin film deposits in ultra high vacuum (UHV)-SEM[1,4]; but this has not generally been done in previous STEM studies. The recently developed UHV-STEM ( codenamed MIDAS) at ASU has efficient collection of secondary electrons using a 'parallelizer' and full sample preparation system[5]. Here we report in-situ deposition and annealing studies on the Ge/Si(100) epitaxial system, and the observation of surface steps on vicinal Si(100) using b-SEI under UHV conditions in MIDAS.Epitaxial crystal growth has previously been studied using SEM and SAM based experiments [4]. The influence of surface defects such as steps on epitaxial growth requires study with high spatial resolution, which we report for the Ge/Si(100) system. Ge grows on Si(100) in the Stranski-Krastonov growth mode wherein it forms pseudomorphic layers for the first 3-4 ML (critical thickness) and beyond which it clusters into islands[6]. In the present experiment, Ge was deposited onto clean Si(100) substrates misoriented 1° and 5° toward <110>. This was done using a mini MBE Knudsen cell at base pressure ~ 5×10-11 mbar and at typical rates of 0.1ML/min (1ML =0.14nm). Depositions just above the critical thickness were done for substrates kept at room temperature, 375°C and 525°C. The R T deposits were annealed at 375°C and 525°C for various times. Detailed studies were done of the initial stages of clustering into very fine (∼1nm) Ge islands and their subsequent coarsening and facetting with longer anneals. From the particle size distributions as a function of time and temperature, useful film growth parameters have been obtained. Fig. 1 shows a b-SE image of Ge island size distribution for a R T deposit and anneal at 525°C. Fig.2(a) shows the distribution for a deposition at 375°C and Fig.2(b) shows at a higher magnification a large facetted island of Ge. Fig.3 shows a distribution of very fine islands from a 525°C deposition. A strong contrast is obtained from these islands which are at most a few ML thick and mottled structure can be seen in the background between the islands, especially in Fig.2(a) and Fig.3.

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