Comparison of autumn and winter development of two wolf spider species (Pardosa, Lycosidae, Araneae) having different life history patterns

Balázs Kiss, F. Samu

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Pardosa species do not overwinter in the adult stage in the Holarctic region, therefore penultimate instars should avoid precocious maturation in autumn. We tested how artificially increased temperature and/or lengthened light regime would affect the pre-overwintering development of two common species with different phenological patterns. Juvenile instars of Pardosa agrestis (Westring 1861) and P. hortensis (Thorell 1872) were collected in autumn from the field. The experimental spiders were held either indoor at 26°C or outdoors at ambient temperature and were exposed either to short or to long daylength. Molting events were monitored for five months. At outdoor temperatures no spiders reached adulthood and molts of younger instars occurred more frequently at long daylength. In the indoor temperature groups all P. hortensis and the majority of P. agrestis individuals reached adulthood during the experiment. Long daylength treatment enhanced the effect of increased temperature by almost halving the time needed to reach adulthood in both species. Penultimate instars of both species needed at least 17 days to molt, while earlier instars, present only in P. agrestis, responded rapidly to higher temperature by molting. This stage dependent response suggests that earlier instars can use favorable autumnal temperatures to catch up with penultimate instars which leads to higher synchrony of developmental stages in the overwintering and spring populations.

Original languageEnglish
Pages (from-to)409-415
Number of pages7
JournalJournal of Arachnology
Volume30
Issue number2
Publication statusPublished - 2002

Fingerprint

Pardosa
Lycosidae
Araneae
instars
life history
autumn
winter
Agrostis
molting
photoperiod
adulthood
temperature
overwintering
ambient temperature
developmental stages

Keywords

  • Diapause
  • Life history
  • Overwintering
  • Stenochronous
  • Wolf spider

ASJC Scopus subject areas

  • Insect Science

Cite this

@article{7ba301de9f0a40149b5bc9715183d518,
title = "Comparison of autumn and winter development of two wolf spider species (Pardosa, Lycosidae, Araneae) having different life history patterns",
abstract = "Pardosa species do not overwinter in the adult stage in the Holarctic region, therefore penultimate instars should avoid precocious maturation in autumn. We tested how artificially increased temperature and/or lengthened light regime would affect the pre-overwintering development of two common species with different phenological patterns. Juvenile instars of Pardosa agrestis (Westring 1861) and P. hortensis (Thorell 1872) were collected in autumn from the field. The experimental spiders were held either indoor at 26°C or outdoors at ambient temperature and were exposed either to short or to long daylength. Molting events were monitored for five months. At outdoor temperatures no spiders reached adulthood and molts of younger instars occurred more frequently at long daylength. In the indoor temperature groups all P. hortensis and the majority of P. agrestis individuals reached adulthood during the experiment. Long daylength treatment enhanced the effect of increased temperature by almost halving the time needed to reach adulthood in both species. Penultimate instars of both species needed at least 17 days to molt, while earlier instars, present only in P. agrestis, responded rapidly to higher temperature by molting. This stage dependent response suggests that earlier instars can use favorable autumnal temperatures to catch up with penultimate instars which leads to higher synchrony of developmental stages in the overwintering and spring populations.",
keywords = "Diapause, Life history, Overwintering, Stenochronous, Wolf spider",
author = "Bal{\'a}zs Kiss and F. Samu",
year = "2002",
language = "English",
volume = "30",
pages = "409--415",
journal = "Journal of Arachnology",
issn = "0161-8202",
publisher = "American Museum of Natural History",
number = "2",

}

TY - JOUR

T1 - Comparison of autumn and winter development of two wolf spider species (Pardosa, Lycosidae, Araneae) having different life history patterns

AU - Kiss, Balázs

AU - Samu, F.

PY - 2002

Y1 - 2002

N2 - Pardosa species do not overwinter in the adult stage in the Holarctic region, therefore penultimate instars should avoid precocious maturation in autumn. We tested how artificially increased temperature and/or lengthened light regime would affect the pre-overwintering development of two common species with different phenological patterns. Juvenile instars of Pardosa agrestis (Westring 1861) and P. hortensis (Thorell 1872) were collected in autumn from the field. The experimental spiders were held either indoor at 26°C or outdoors at ambient temperature and were exposed either to short or to long daylength. Molting events were monitored for five months. At outdoor temperatures no spiders reached adulthood and molts of younger instars occurred more frequently at long daylength. In the indoor temperature groups all P. hortensis and the majority of P. agrestis individuals reached adulthood during the experiment. Long daylength treatment enhanced the effect of increased temperature by almost halving the time needed to reach adulthood in both species. Penultimate instars of both species needed at least 17 days to molt, while earlier instars, present only in P. agrestis, responded rapidly to higher temperature by molting. This stage dependent response suggests that earlier instars can use favorable autumnal temperatures to catch up with penultimate instars which leads to higher synchrony of developmental stages in the overwintering and spring populations.

AB - Pardosa species do not overwinter in the adult stage in the Holarctic region, therefore penultimate instars should avoid precocious maturation in autumn. We tested how artificially increased temperature and/or lengthened light regime would affect the pre-overwintering development of two common species with different phenological patterns. Juvenile instars of Pardosa agrestis (Westring 1861) and P. hortensis (Thorell 1872) were collected in autumn from the field. The experimental spiders were held either indoor at 26°C or outdoors at ambient temperature and were exposed either to short or to long daylength. Molting events were monitored for five months. At outdoor temperatures no spiders reached adulthood and molts of younger instars occurred more frequently at long daylength. In the indoor temperature groups all P. hortensis and the majority of P. agrestis individuals reached adulthood during the experiment. Long daylength treatment enhanced the effect of increased temperature by almost halving the time needed to reach adulthood in both species. Penultimate instars of both species needed at least 17 days to molt, while earlier instars, present only in P. agrestis, responded rapidly to higher temperature by molting. This stage dependent response suggests that earlier instars can use favorable autumnal temperatures to catch up with penultimate instars which leads to higher synchrony of developmental stages in the overwintering and spring populations.

KW - Diapause

KW - Life history

KW - Overwintering

KW - Stenochronous

KW - Wolf spider

UR - http://www.scopus.com/inward/record.url?scp=0036447305&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036447305&partnerID=8YFLogxK

M3 - Article

VL - 30

SP - 409

EP - 415

JO - Journal of Arachnology

JF - Journal of Arachnology

SN - 0161-8202

IS - 2

ER -