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Titolo:
COMPARISON OF THE FAST-START PERFORMANCES OF CLOSELY-RELATED, MORPHOLOGICALLY DISTINCT THREESPINE STICKLEBACKS (GASTEROSTEUS SPP)
Autore:
LAW TC; BLAKE RW;
Indirizzi:
UNIV BRITISH COLUMBIA,DEPT ZOOL,6270 UNIV BLVD VANCOUVER BC V6T 1Z4 CANADA
Titolo Testata:
Journal of Experimental Biology
fascicolo: 12, volume: 199, anno: 1996,
pagine: 2595 - 2604
SICI:
0022-0949(1996)199:12<2595:COTFPO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROUT SALMO-GAIRDNERI; PREDATOR-PREY INTERACTIONS; ANGELFISH PTEROPHYLLUM-EIMEKEI; PIKE ESOX-LUCIUS; RAINBOW-TROUT; BRITISH-COLUMBIA; NORTHERN PIKE; SPECIES-PAIR; SELECTIVE PREDATION; ADAPTIVE RADIATION;
Keywords:
STICKLEBACK; GASTEROSTEUS SPP; ESCAPE PERFORMANCE; FAST-START; SWIMMING PERFORMANCE; FUNCTIONAL MORPHOLOGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
T.C. Law e R.W. Blake, "COMPARISON OF THE FAST-START PERFORMANCES OF CLOSELY-RELATED, MORPHOLOGICALLY DISTINCT THREESPINE STICKLEBACKS (GASTEROSTEUS SPP)", Journal of Experimental Biology, 199(12), 1996, pp. 2595-2604

Abstract

Fast-start escape performances for two species of threespine stickleback, Gasterosteus spp., were investigated using high-speed cinematography (400 Hz). The two fishes (not yet formally described, referred to here as benthic and limnetic) inhabit different niches within Paxton Lake, British Columbia, Canada, and are recent, morphologically distinct species. All escape responses observed for both species were double-bend C-type fast-starts. There were no significant differences betweenthe species for any linear or angular parameter (pooled averages, both species: duration 0.048s, distance 0.033m, maximum velocity 1.10 m s(-1), maximum acceleration 137 m s(-2), maximum horizontal angular velocity 473.6 rad s(-1) and maximum overall angular velocity 511.1 rad s(-1)). Benthics and limnetics have the greatest added mass (M(a)) at 0.3 and 0.6 body lengths, respectively. The maximum M(a) does not include the fins for benthics. but for limnetics the dorsal and anal fins contribute greatly to the maximum M(a). The deep, posteriorly placed fins of limnetics enable them to have a fast-start performance equivalent to that of the deeper-bodied benthics. Both the limnetic and benthicfishes have significantly higher escape fast-start velocities than their ancestral form, the anadromous threespine stickleback Gasterosteusaculeatus, suggesting that the high performance of the Paxton Lake sticklebacks is an evolutionarily derived trait. In this biomechanical study of functional morphology, we demonstrate that similar high fast-start performance can be achieved by different suites of morphological characteristics and suggest that predation might be the selective force for the high escape performance in these two fishes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 20:49:34