scholarly journals Behavloural effects of an antigonadotropin, of sexual hormones, and of psychopharmaka in the pumpkinseed sunfish,Lepomis gibbosus (Centrarchidae)

1972 ◽  
Vol 28 (10) ◽  
pp. 1195-1196 ◽  
Author(s):  
B. Kramer
Keyword(s):  
Lepomis Gibbosus ◽  
Sexual Hormones ◽  
Pumpkinseed Sunfish

scholarly journals Flexible mate choice may contribute to ecotype assortative mating in pumpkinseed sunfish (Lepomis gibbosus)

2017 ◽  
Vol 30 (10) ◽  
pp. 1810-1820 ◽  
Author(s):  
W. M. C. Jarvis ◽  
S. M. Comeau ◽  
S. F. Colborne ◽  
B. W. Robinson
Keyword(s):  
Mate Choice ◽  
Assortative Mating ◽  
Lepomis Gibbosus ◽  
Pumpkinseed Sunfish

Effect of stimulus train duration and cycle frequency on the capacity to do work in the pectoral fin muscle of the pumpkinseed sunfish, Lepomis gibbosus

1993 ◽  
Vol 71 (11) ◽  
pp. 2185-2189 ◽  
Author(s):  
Eric A. Luiker ◽  
E. Don Stevens
Keyword(s):  
Duty Cycle ◽  
Length Change ◽  
Lepomis Gibbosus ◽  
Pectoral Fin ◽  
Cycle Frequency ◽  
Pumpkinseed Sunfish ◽  
Train Duration ◽  
Stimulus Train ◽  
Length Changes ◽  
Time Required

The goal of our experiment was to elucidate the effect of stimulus duty cycle (the percentage of the cycle that the muscle was stimulated), phase (the relative timing of the imposed sinusoidal length change and stimulation), and muscle cycle frequency (the speed at which the muscle was cycled) on work and power in the pectoral fin muscle of a labriform swimmer, the pumpkinseed sunfish, Lepomis gibbosus. Stimulus train duration was varied from a twitch to a 40% duty cycle; cycle frequency was varied from 1 to 8 Hz. Work was calculated as the area of work loops produced by muscle contractions while the muscle was undergoing sinusoidal length changes. Maximum net work per cycle (6.2 J/kg) was produced at 1 Hz cycle frequency and a 32% duty cycle. Maximum power (26.7 W/kg) was produced at 5 Hz cycle frequency and a 16% duty cycle. As cycle frequency increased, the duty cycle and the stimulus train duration that produced maximum work decreased. The relatively long relaxation time compared with the length of time required to complete the whole cycle precluded the muscle from doing net positive work at high cycle frequencies.

scholarly journals Reproduction of a South American population of pumpkinseed sunfish Lepomis gibbosus (Linnaeus) (Osteichthyes, Centrarchidae): a comparison with the European and North American populations

2005 ◽  
Vol 22 (2) ◽  
pp. 477-483 ◽  
Author(s):  
André L. B. de Magalhães ◽  
Thiago F. Ratton
Keyword(s):  
Gonadosomatic Index ◽  
Brazilian Population ◽  
Lepomis Gibbosus ◽  
South American ◽  
South American Population ◽  
Multiple Spawning ◽  
Pumpkinseed Sunfish ◽  
Introduced Populations ◽  
Egg Diameter ◽  
Made In

The reproductive biology of the introduced pumpkinseed sunfish Lepomis gibbosus (Linnaeus, 1758) in the Custódio's Dam, rio Doce high basin, state of Minas Gerais, Brazil was studied from February/2001 to March/2002 and compared with introduced and native populations. Reproduction occurred almost along the entire period of study with a high frequency of fishes in the advanced ripening/mature and spawned/spent stages. The microscopic analyses indicated that the pumpkinseed sunfish presents multiple spawning. The egg diameter of the Brazilian population is similar to the Spanish, Greek and American ones. The standard length at maturity and the gonadosomatic index of the introduced populations are smaller when compared with native ones. The spawning season of the Brazilian population was the longest among all comparisons made in the present work.

A Pluralistic Analysis of Character Release in Pumpkinseed Sunfish (Lepomis Gibbosus)

Ecology ◽  
2000 ◽  
Vol 81 (10) ◽  
pp. 2799 ◽  
Author(s):  
Beren W. Robinson ◽  
David Sloan Wilson ◽  
Arlene S. Margosian
Keyword(s):  
Lepomis Gibbosus ◽  
Pumpkinseed Sunfish

Body Color Pattern and the Aggressive Behavior of Male Pumpkinseed Sunfish (Lepomis Gibbosus) During the Reproductive Season

Behaviour ◽  
1978 ◽  
Vol 64 (3-4) ◽  
pp. 271-296 ◽  
Author(s):  
Peter B. Stacey ◽  
David Chiszar
Keyword(s):  
Aggressive Behavior ◽  
Color Pattern ◽  
Dark Spot ◽  
Lepomis Gibbosus ◽  
Nesting Ecology ◽  
Dorsal Fin ◽  
Pumpkinseed Sunfish ◽  
Conspicuous Feature ◽  
Pattern Change ◽  
Interspecific Recognition

AbstractMale pumpkinseed sunfish (Lepomis gibbosus) readily attacked plywood models placed into their nests. Models containing red features (iris, opercular flap) received more attacks and aggressive displays than models lacking these features or than models which had these features painted black. This indicates that in the pattern of the male pumpkinseed, the red portion of the opercular flap and the red iris are social releasers for aggressive behavior. These features fade in subordinate pumpkinseeds in the laboratory and also in female pumpkinseeds before they enter the male's nest during reproduction. This pattern change would therefore function to decrease aggressive behavior directed at these individuals. A conspicuous feature of the female pumpkinseed is the presence of lateral bars. When bars were added to models, reductions in aggressive behavior were consistently observed. Hence, bars appear to inhibit male aggression. Bluegill sunfish (L. macrochirus) nest sympatrically with pumpkinseeds and interspecific nest defense was commonly seen. A conspicuous feature of male bluegills is a dark spot in the area of the dorsal fin rays. When such a spot is added to models, increases in aggressive behavior were observed in male pumpkinseeds. Hence, this feature may provide a basis for interspecific recognition and reproductive isolation. Finally, pumpkinseeds responded more vigorously to models than did bluegills. This may imply that the former are more attuned to morphological features than the latter. Bluegills, on the other hand, may be more attuned to the behavior of nest intruders. This hypothesis agrees with differences in the nesting ecology of these species.

scholarly journals Motor correlates of learning behaviour: feeding on novel prey by pumpkinseed sunfish (Lepomis gibbosus)

1986 ◽  
Vol 126 (1) ◽  
pp. 237-247 ◽  
Author(s):  
P. C. Wainwright
Keyword(s):  
Muscle Activity ◽  
Prey Capture ◽  
Average Duration ◽  
Maximum Amplitude ◽  
Lepomis Gibbosus ◽  
Learning Behaviour ◽  
Functional Determinant ◽  
Feeding Performance ◽  
Pumpkinseed Sunfish ◽  
Improved Performance

The functional basis of learning in prey capture was investigated in the pumpkinseed sunfish (Lepomis gibbosus). Feeding performance of sunfishes was assessed when the fish were first fed a novel, elusive prey (guppies) and compared with their performance after several weeks of experience with capturing guppies. During these feedings electromyographic recordings were made to document the pattern of activity in four jaw muscles at the strike. With experience, the L. gibbosus improved their ability to capture guppies, and several changes in the pattern of muscle activity were associated with this improved performance. Average duration and maximum amplitude of activity in all muscles increased between trials. Previous studies of muscle activity modulation in fishes indicate that these changes could improve feeding performance on an elusive prey. Thus, specific modifications of muscle activity appear to be one functional determinant of feeding success in fishes.

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