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Titolo:
Drumming behavior and life history notes of a high-altitude colorado population of the stonefly Isoperla Petersoni Needham & Christenson (Plecoptera : Perlodidae)
Autore:
Sandberg, JB; Stewart, KW;
Indirizzi:
Univ N Texas, Dept Biol Sci, Denton, TX 76203 USA Univ N Texas Denton TX USA 76203 xas, Dept Biol Sci, Denton, TX 76203 USA
Titolo Testata:
WESTERN NORTH AMERICAN NATURALIST
fascicolo: 4, volume: 61, anno: 2001,
pagine: 445 - 451
SICI:
1527-0904(200110)61:4<445:DBALHN>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
WISCONSIN TROUT STREAM; FOOD-HABITS; RIVER; CYCLE;
Keywords:
stonefly; drumming; life history; Perlodidae; behavior;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Sandberg, JB Univ N Texas, Dept Biol Sci, Denton, TX 76203 USA Univ N Texas Denton TX USA 76203 l Sci, Denton, TX 76203 USA
Citazione:
J.B. Sandberg e K.W. Stewart, "Drumming behavior and life history notes of a high-altitude colorado population of the stonefly Isoperla Petersoni Needham & Christenson (Plecoptera : Perlodidae)", WEST N AM N, 61(4), 2001, pp. 445-451

Abstract

Late instar nymphs and adults of a Colorado Hudsonian zone population of Isoperla petersoni Needham and Christenson were studied during the summer and early fall months of 1998, when stream temperature ranged from 3.3 degreesC to 8.9 degreesC. Early and middle instar nymphs were absent from July toOctober, and nymphs attained maximum size in mid-August during the 2nd week of adult field presence, suggesting a univoltine-slow life cycle. Nymphs were carnivorous and fed primarily on chironomid larvae. Adults were present from August to mid-October, with peak numbers of adult males and females occurring in mid-September and late September, respectively. Fecundity of field-collected females averaged 94.1 +/- 45.15 eggs per female in September(N = 81) and decreased to 85.2 +/- 57.6 in October (N = 12). Drumming duets were 2-way (male-female), and female answers followed male calls (nonoverlapped) or began before completion of the male call (overlapped). Male calls averaged 11.1 +/- 2.09 beats and female answers averaged 6.2 +/- 2.99, with mean intervals of 118 and 58 ms, respectively. The average number of female answer beats increased from 5.3 +/- 2.56 when duets were nonoverlapped,to 6.6 +/- 3.08 when overlapped.

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Documento generato il 12/07/20 alle ore 08:48:42