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Titolo:
COMPETITION IN 2 SPECIES OF LARVAL SALAMANDERS - A TEST OF GEOGRAPHIC-VARIATION IN COMPETITIVE ABILITY
Autore:
SEMLITSCH RD; WALLS SC;
Indirizzi:
UNIV ZURICH,INST ZOOL CH-8057 ZURICH SWITZERLAND UNIV SW LOUISIANA,DEPT BIOL LAFAYETTE LA 70504
Titolo Testata:
Copeia
fascicolo: 3, , anno: 1993,
pagine: 587 - 595
SICI:
0045-8511(1993):3<587:CI2SOL>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERSPECIFIC COMPETITION; INTERFERENCE COMPETITION; ASYMMETRICAL COMPETITION; TERRESTRIAL SALAMANDERS; FIELD EXPERIMENTS; POND COMMUNITIES; TEMPORARY POND; LIFE-HISTORY; POPULATION; EVOLUTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
R.D. Semlitsch e S.C. Walls, "COMPETITION IN 2 SPECIES OF LARVAL SALAMANDERS - A TEST OF GEOGRAPHIC-VARIATION IN COMPETITIVE ABILITY", Copeia, (3), 1993, pp. 587-595

Abstract

We studied the competitive interactions of two species of larval salamanders (Ambystoma maculatum and A. talpoideum) which occur either syntopically or allotopically in parts of their common geographic range (Mississippi and South Carolina, respectively). Larvae from both geographic regions were reared alone and combined at two total densities in artificial ponds to test a hypothesis of geographic variation in competitive ability. Although both species exhibited negative responses to increasing total density, neither showed geographic variation according to species origin or competitor origin. Ambystoma talpoideum exhibited reduced growth rate, final body size, and metamorphosis at high total density; A. maculatum exhibited only reduced growth rate and final body size. At equal total density, the body size of A. talpoideum was higher when reared with heterospecifics compared to those reared with conspecifics; whereas A. maculatum showed a slightly reduced body sizewhen reared with heterospecifics compared to conspecifics. Our data indicate that A. talpoideum from both regions were competitively superior, and supporting studies suggest that the aggressive behavior of this species can be used to explain this outcome, independent of body size differences or other mechanisms. The lack of geographic variation inspecies responses suggests to us that the competitive environments inboth regions are similar and that interactions of other factors in the aquatic or the terrestrial environment may influence their local distributions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:25:49