The energetic implications of the diel onshore-offshore migration by dace(Phoxinus eos x P. neogaeus) in a small oligotrophic lake

1997 ◽  
Vol 54 (9) ◽  
pp. 1996-2006 ◽  
Author(s):  
S Gauthier ◽  
D Boisclair
Keyword(s):  
Littoral Zone ◽  
Oligotrophic Lake ◽  
Pelagic Zone ◽  
Lepomis Gibbosus ◽  
Daily Ration ◽  
Average Growth ◽  
Mass Growth ◽  
Pumpkinseed Sunfish ◽  
Consumption Rates

We assessed the energetic implications of onshore-offshore migrations executed by dace (Phoxinus eos times P. neogaeus). We estimated growth, consumption, and activity rates for dace allowed to migrate and for dace restricted to the littoral zone during 45 days. We also estimated the growth and consumption rates of a permanent littoral resident, the pumpkinseed sunfish (Lepomis gibbosus) kept with migrating dace and compared these values with those obtained for sunfish kept with dace restricted to the littoral zone. Dace migrated from the littoral towards the pelagic zone at dusk and returned to the littoral zone at dawn. On average, 70% of the daily ration of dace was obtained during the migration. Consumption and activity rates of dace that executed diel migrations were twice those estimated for dace restricted to the littoral zone. Average growth of dace allowed to migrate was 0.38 g wet mass, but fish resticted to the littoral lost 0.36 g wet mass. Growth and consumption rates of sunfish were not affected by the confinement of dace in the littoral zone. The survival of dace in the presence of a littoral competitor and a pelagic predator appears closely linked to the energetic advantages associated to diel onshore-offshore migrations.

Diel onshore–offshore migrations in northern redbelly dace, Phoxinus eos (Cope), in relation to prey distribution in a small oligotrophic lake

1988 ◽  
Vol 66 (6) ◽  
pp. 1249-1253 ◽  
Author(s):  
Marc Naud ◽  
Pierre Magnan
Keyword(s):  
Littoral Zone ◽  
Salvelinus Fontinalis ◽  
Oligotrophic Lake ◽  
Pelagic Zone ◽  
Brook Charr ◽  
Significant Preference ◽  
Prey Distribution ◽  
Feeding Efficiency ◽  
Risk Of Predation ◽  
Increased Risk

Northern redbelly dace, Phoxinus eos (Cope), exhibit diel onshore–offshore migrations in a small oligotrophic Quebec lake. The fish swim in shoals in the littoral zone during the day, migrate to the pelagic zone at sunset, where the shoals break up into single fish, and then go back to the littoral zone at sunrise. Dace eat mainly two cladocerans, Daphnia and Holopedium. Zooplankton sampling indicated that Daphnia were significantly more abundant in the pelagic zone than in the littoral zone, and Holopedium were rarely found in the littoral zone. Dace showed a significant preference for a dense cover habitat over a sparse cover habitat in the littoral zone during the day. Our results support the hypothesis that dace migrate to the pelagic zone at sunset to increase their feeding efficiency on zooplankton. The foraging benefits of remaining in the offshore zone may be offset by increased risk of predation by brook charr, Salvelinus fontinalis (Mitchill), during the daylight hours, thus resulting in diel onshore–offshore migrations.

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

scholarly journals Effect of habitat complexity on the distribution of Ceriodaphnia quadrangula (O. F. Müller, 1785) (Crustacea: Cladocera) in a deep lake

2010 ◽  
Vol 47 (2) ◽  
pp. 51-58 ◽  
Author(s):  
Małgorzata Adamczuk
Keyword(s):  
Surface Layer ◽  
Brood Size ◽  
Habitat Complexity ◽  
Littoral Zone ◽  
Open Water ◽  
The Other ◽  
Pelagic Zone ◽  
Submerged Vegetation ◽  
Deep Lake ◽  
Ceriodaphnia Quadrangula

Effect of habitat complexity on the distribution of Ceriodaphnia quadrangula (O. F. Müller, 1785) (Crustacea: Cladocera) in a deep lake The aim of the study was to compare the density, body size, and reproduction of the cladoceran, Ceriodaphnia quadrangula (O. F. Müller, 1785), in various habitats of Lake Piaseczno (38.8 m deep) in eastern Poland. Samples were taken in the littoral zone (from emergent and submerged vegetation, as well as from open water and the surface layer of water above submerged vegetation) and in the pelagic zone (from the epilimnion, metalimnion, and hypolimnion). The results show that C. quadrangula prefers the littoral zone, as it achieves there much higher values of the analysed variables than in the pelagic zone. The number and size of adults (including ovigerous females), as well as brood size achieved equally high values in emergent and submerged vegetation, and much lower values in the other habitats (including pelagic ones). Juveniles also preferred to stay in the littoral zone but displayed clear preferences to none of the habitats.

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.

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