Light, Eyestalk Chemical, and Certain Other Factors as Regulators of Community Activity for the Crayfish, Cambarus virilis Hagen

Roberts, Tilden W.

doi:10.2307/1948616

Cited by 39 publications

(15 citation statements)

References 61 publications

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“…Each pair was observed for 30 min, either early in the morning or late in the evening. This time schedule corresponded to the peak activity periods, as indicated by previous observations (ROBERTS, 1944 ;BOVBJERG, 1956BOVBJERG, , 1970HECKENLIVELY, 1970 ;FLINT, 1977 ;GHERARDI etal., 1988).…”

Section: Competitionsupporting

confidence: 79%

Italian freshwater decapods: Exclusion between the crayfishAustropotamobius pallipes(FAXON) and the crabPotamon fluviatile(HERBST)

Barbaresi¹,

Gherardi

1997

Knowledge and Management of Aquatic Ecosystems

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In Italian freshwater systems, the crayfish Austropotamobius pallipes and the crab Potamon fluviatile mainly occur in different geographic areas and, when they are in sympatry, in different streams. Four issues are raised : (1) the two species once coexisted, (2) the two species share the same resources, (3) river crab is behaviorally dominant over crayfish, and (4) crab influences the habitat occupied by crayfish. These issues suggest a scenario of competitive exclusion in these two species, which is the result of past interspecific competition for common resources. The winner was P. fluviatile which had higher levels of aggression and strength than A. pallipes ; the latter was forced to migrate to other regions or, when still in sympatry, to remain in less favorable habitats, characterized by a lower temperature regime. Key-words DÉCAPODES D'EAU DOUCE ITALIENS : EXCLUSION ENTRE L'ÉCREVISSE AUSTROPOTAMOBIUS PALLIPES (FAXON) ET LE CRABE POTAMON FLUVIATILE (HERBST).Dans le réseau d'eau douce italien, l'écrevisse Austropotamobius pallipes et le crabe Potamon fluviatile sont présents dans différentes aires géographiques et, quand ils sont en sympatrie, ils vivent dans des cours d'eau différents.Quatre points sont relevés : (1) les deux espèces ne coexistaient qu'à une seule occasion, (2) les deux espèces partagent les mêmes ressources, (3) le crabe d'eau douce présente un comportement dominant sur l'écrevisse, (4) le crabe influence l'habitat occupé par l'écrevisse. Ces observations suggèrent un scénario d'exclusion compétitive entre ces Bull. Fr. Pêche Piscic. (1997)

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Section: Competitionsupporting

confidence: 79%

Italian freshwater decapods: Exclusion between the crayfishAustropotamobius pallipes(FAXON) and the crabPotamon fluviatile(HERBST)

Barbaresi¹,

Gherardi

1997

Knowledge and Management of Aquatic Ecosystems

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“…In 1938, Kalmus reported that the removal of the eyestalk of crayfish Potamobius resulted in an increase in activity as well as an apparent loss of circadian activity rhythm. Other authors (Roberts, 1944;Schallek, 1942) confirmed these results in Cambarus. However, Page and Larimer (1975a) demonstrated in Procambarus clarkii the persistence of rhythmicity following eyestalk ablation, although neural isolation of thoracic motor centers from the supraesophageal ganglion by section of the circumesophageal connection always resulted in aperiodic behaviour.…”

Section: Motor Activity Rhythmsupporting

confidence: 54%

The circadian system of crayfish: A developmental approach

Fanjul‐Moles

Prieto-Sagredo

2003

Microscopy Res & Technique

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Adult crayfish exhibit a variety of overt circadian rhythms. However, the physiological mechanisms underlying the overt rhythms are controversial. Research has centered on two overt rhythms: the motor activity and the retinal sensitivity rhythms of the genus Procambarus. The present work reviews various studies undertaken to localize pacemakers and mechanisms of entrainment responsible for these two rhythms in adult organisms of this crustacean decapod. It also describes an ontogenetic approach to the problem by means of behavioral, electrophysiological, and neurochemical experiments. The results of this approach confirm previous models proposed for adult crayfish, based on a number of circadian pacemakers distributed in the central nervous system. However, the coupling of rhythmicity between these independent oscillators might be complex and dependent on the interaction between serotonin (5-HT), light, and the crustacean hyperglycemic hormone (CHH). The latter compound has, up until now, not been considered as an agent in the genesis and synchronization of the retinal sensitivity rhythm.

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“…In P. clarkii, movement is ruled by a nychthemeral rhythm, which is the prevailing pattern in freshwater decapods (e.g., in Orconectes virilis, Roberts, 1944, Hazlett et al, 1974 in Austropotamobius pallipes (Lereboullet), Arrignon, 1996, Barbaresi et al, 1998ain Potamon gedrosianum, Schneider, 1971; Potamon fluviatile, Gherardi et al, 1988). At both Osmannoro and Massaciuccoli, in spring and summer, crayfish activity increases at dusk, reaches a maximum at 18 -22 h and continues until the early hours of the morning.…”

Section: Temporal Patternsmentioning

confidence: 99%

Spatial and temporal patterns in the movement of Procambarus clarkii, an invasive crayfish

2000

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Introduced in Italy in the 1980s for aquaculture enterprises, the red swamp crayfish, Procambarus clarkii, has invaded many water bodies, giving rise to breeding populations that now threaten freshwater ecosystems. An understanding of the spatial behaviour of this crayfish could be the baseline for future research aimed at control and management. Following the same pattern as other freshwater decapods, P. clarkii, studied in an irrigation ditch system in Florence, Tuscany, displayed stationary phases (several marked individuals were recaptured in the area) interposed with nomadic bursts of movement (many marked crayfish disappeared). With a few exceptions, nocturnal activity prevailed in almost all the seasons in two different analysed habitats (irrigation ditches and the Massaciuccoli Lake, Lucca). However, in the laboratory, locomotion occurred mostly at daytime. Although still prevailing, P. clarkii's nocturnal activity appeared puzzling, because some of its major predators are nocturnal and this species is mostly herbivorous. The intercalation between stationary and wandering phases leaves open further promising studies on social structures in the field.

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Light, Eyestalk Chemical, and Certain Other Factors as Regulators of Community Activity for the Crayfish, Cambarus virilis Hagen

Cited by 39 publications

References 61 publications

Italian freshwater decapods: Exclusion between the crayfishAustropotamobius pallipes(FAXON) and the crabPotamon fluviatile(HERBST)

Italian freshwater decapods: Exclusion between the crayfishAustropotamobius pallipes(FAXON) and the crabPotamon fluviatile(HERBST)

The circadian system of crayfish: A developmental approach

Spatial and temporal patterns in the movement of Procambarus clarkii, an invasive crayfish

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