Reproductive investment and somatic growth rates in longear sunfish

1992 ◽  
Vol 35 (3) ◽  
pp. 257-271 ◽  
Author(s):  
Martin J. Jennings ◽  
David P. Philipp
Keyword(s):  
Growth Rates ◽  
Somatic Growth ◽  
Reproductive Investment ◽  
Longear Sunfish

Temporal variation in the early life-history characteristics of the King George whiting (Sillaginodes punctata) from analysis of otolith microstructure

1996 ◽  
Vol 47 (6) ◽  
pp. 809 ◽  
Author(s):  
AJ Fowler ◽  
DA Short
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Early Life ◽  
Somatic Growth ◽  
South Australia ◽  
Early Life History ◽  
Exponential Relationship ◽  
Life History Characteristics ◽  
Linear Relationships ◽  
Temperature Regimes

This study describes the duration of the settlement season, the somatic and otolith growth rates, and presettlement durations for Sillaginodes punctata at Barker Inlet, South Australia. The settlement season was from June to November, with settlement occurring in two phases over this period. Somatic growth rates ranged from <0.1 to 0.25 mm day-1 depending on age and time of year, making size (SL) a relatively poor indicator of age. Alternatively, otolith size (OL) was strongly related to age, but the linear relationships varied systematically among sampling occasions. Because of variation in somatic growth rates, the SL-OL relationships were relatively poor. The biological intercept method was used to back-calculate fish sizes from otolith increment widths for three samples of fish. These growth trajectories differed considerably, two being logistic in shape and the third being an exponential relationship. Presettlement durations increased from 80 to 130 days between June and September and were inversely related to growth rate. Settlement competence is related more to size than to age. The broad natural variation in early life-history characteristics is likely to relate to water temperature regimes along larval advection pathways through the long settlement season.

In situ growth rate estimates of Southern Ocean krill, Thysanoessa macrura

2019 ◽  
Vol 31 (3) ◽  
pp. 116-122 ◽  
Author(s):  
Jake R. Wallis ◽  
Jessica E. Melvin ◽  
Robert King ◽  
So Kawaguchi
Keyword(s):  
Growth Rate ◽  
Southern Ocean ◽  
Growth Rates ◽  
Somatic Growth ◽  
Growth Patterns ◽  
Daily Growth ◽  
Thysanoessa Macrura ◽  
Growth Method ◽  
Repeated Sampling ◽  
The Antarctic

AbstractGrowth, which is intrinsically linked to environmental conditions including temperature and food availability are highly variable both temporally and spatially. Estimates of growth rates of the Southern Ocean euphausiid Thysanoessa macrura are currently restricted to limited studies which rely upon repeated sampling and length-frequency analysis to quantify growth rates. The instantaneous growth method (IGR) was used to measure the growth rate of T. macrura successfully in the southern Kerulen Plateau region during summer, providing the first IGR parameters for the Southern Ocean euphausiid species. Results of the four-day IGR incubation indicate a period of low somatic growth for adult T. macrura. Males had a longer intermoult period (IMP) (62 days) than females (42 days), but the sexes exhibited similar daily growth rates of 0.011 mm day−1 and 0.012 mm day−1 respectively. Juveniles exhibited the fastest growth, with an IMP of 13 days and daily growth rate of 0.055 mm day−1 indicating a prolonged growth season, similar to the Antarctic krill E. superba. Consequently, we highlight the usability of the IGR method and strongly encourage its use in developing a comprehensive understanding of spatial and seasonal growth patterns of T. macrura.

scholarly journals Female-mediated causes and consequences of status change in a social fish

2008 ◽  
Vol 275 (1637) ◽  
pp. 929-936 ◽  
Author(s):  
J.L Fitzpatrick ◽  
J.K Desjardins ◽  
N Milligan ◽  
K.A Stiver ◽  
R Montgomerie ◽  
...  
Keyword(s):  
Social Status ◽  
Group Dynamics ◽  
Cichlid Fish ◽  
Somatic Growth ◽  
Reproductive Investment ◽  
Status Change ◽  
Complex Interactions ◽  
Social Species ◽  
Abrupt Changes ◽  
Reproductive Anatomy

In highly social species, dominant individuals often monopolize reproduction, resulting in reproductive investment that is status dependent. Yet, for subordinates, who typically invest less in reproduction, social status can change and opportunities to ascend to dominant social positions are presented suddenly, requiring abrupt changes in behaviour and physiology. In this study, we examined male reproductive anatomy, physiology and behaviour following experimental manipulations of social status in the cooperatively breeding cichlid fish, Neolamprologus pulcher . This unusual fish species lives in permanent social groups composed of a dominant breeding pair and 1–20 subordinates that form a linear social dominance hierarchy. By removing male breeders, we created 18 breeding vacancies and thus provided an opportunity for subordinate males to ascend in status. Dominant females play an important role in regulating status change, as males successfully ascended to breeder status only when they were slightly larger than the female breeder in their social group. Ascending males rapidly assumed behavioural dominance, demonstrated elevated gonadal investment and androgen concentrations compared with males remaining socially subordinate. Interestingly, to increase gonadal investment ascending males appeared to temporarily restrain somatic growth. These results highlight the complex interactions between social status, reproductive physiology and group dynamics, and underscore a convergent pattern of reproductive investment among highly social, cooperative species.

scholarly journals Somatic growth rates for a hawksbill turtle population in coral reef habitat around Barbados

2011 ◽  
Vol 432 ◽  
pp. 269-276 ◽  
Author(s):  
BH Krueger ◽  
MY Chaloupka ◽  
PA Leighton ◽  
JA Dunn ◽  
JA Horrocks
Keyword(s):  
Coral Reef ◽  
Growth Rates ◽  
Somatic Growth ◽  
Reef Habitat ◽  
Turtle Population ◽  
Coral Reef Habitat

scholarly journals Life histories have a history: effects of past and present conditions on adult somatic growth rates in wild Trinidadian guppies

2012 ◽  
Vol 81 (4) ◽  
pp. 818-826 ◽  
Author(s):  
Sonya K. Auer ◽  
Andrés Lopez-Sepulcre ◽  
Thomas Heatherly ◽  
Tyler J. Kohler ◽  
Ronald D. Bassar ◽  
...  
Keyword(s):  
Growth Rates ◽  
Life Histories ◽  
Somatic Growth ◽  
History Effects

Interpretation of Otolith Microstructure in Juvenile Winter Flounder (Pseudopleuronectes americanus): Ontogenetic Development, Daily Increment Validation, and Somatic Growth Relationships

1991 ◽  
Vol 48 (10) ◽  
pp. 1862-1871 ◽  
Author(s):  
Susan M. Sogard
Keyword(s):  
Growth Rates ◽  
Somatic Growth ◽  
Winter Flounder ◽  
Pseudopleuronectes Americanus ◽  
Otolith Growth ◽  
Morphological Asymmetry ◽  
Daily Increments ◽  
Absolute Growth ◽  
Left And Right ◽  
Calcium Carbonate Deposition

In winter flounder (Pseudopleuronectes americanus), sagittae developed secondary origins of calcium carbonate deposition during metamorphosis just prior to completion of eye migration. Sagittae and lapilli of larvae were bilaterally symmetrical, but those of postmetamorphic individuals showed increasing morphological asymmetry between the left and right side. In juveniles marked with oxytetracycline and maintained in field enclosures for 10 d, increment deposition on sagittae was daily if somatic growth following marking was good (> 0.25 mm∙d−1), but less than daily in individuals with poor or negative somatic growth (< 0.25 mm∙d−1). Narrowly spaced increments or divergence of otolith growth from the main rostral–postrostral growth axis, where counts were made, may have limited detection of daily deposition. Lack of detectable daily increments occurred primarily in larger juveniles (> 50 mm total length), which had lower absolute growth rates than newly settled juveniles. In oxytetracycline-marked fish there was a significant correspondence between otolith growth and somatic growth in both length and weight. The strength of this relationship, which varied with the specific radius used, was highest (r = 0.854) for the rostral radius of the left sagitta; increment widths along this radius are reliable estimators of prior somatic growth rates.

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