Altitudinal variation in body size and population density of Nicrophorus investigator (Coleoptera: Silphidae)

Rosemary J. Smith, Amy Hines, Stephanie Richmond, Melissa J Merrick, Allison Drew, Rachelle Fargo

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Increasing altitude may influence insect communities, population sizes, life-histories, and morphology. Nicrophorus investigator Zetterstedt, a holarctic species, occurs over a range of elevations in the western Rocky Mountains of North America. This study examines changes in population density, seasonal activity periods, morphology, and reproduction at three sites over an elevational gradient in the southern Rocky Mountains of Colorado. N. investigator population sizes varied yearly at both low (≃2,800 m) and high (≃3,200 m) elevations, but were always greater at the lower elevations. Adult activity at all sites began in late June, remained relatively constant throughout July, and declined by late August. Elytron length was highly correlated both with body mass and pronotum width. There was no difference in elytron length between males and females (within years sites). However elytron length was significantly greater in 5 out of 6 yr at the higher elevation site, and in 1999, at two additional low and high elevation sites in separate drainages. Beetles at the low and high elevation sites differed slightly in their reproductive strategies under captive conditions at the high elevation the number of larvae did not increase with carcass size thus larvae from larger carcasses weighed more than larvae reared on smaller carcasses. At the low elevation, brood size tended to increase with carcass mass, resulting in similar-sized larvae across all carcass masses. On average, brood growth efficiency (total brood grams/carcass grams) was higher at the higher elevation, perhaps explained by developing at lower temperature. These results indicate that both life-history strategies and developmental processes may be involved in the elevational variation seen in this species.

Original languageEnglish (US)
Pages (from-to)290-298
Number of pages9
JournalEnvironmental Entomology
Volume29
Issue number2
StatePublished - Apr 2000
Externally publishedYes

Fingerprint

Nicrophorus
Silphidae
body size
population density
Coleoptera
larvae
Rocky Mountain region
population size
life history
insect communities
larva
drainage
mountain
brood size
elytra
reproductive strategy
body mass
temperature
beetle
insect

Keywords

  • Body size
  • Elevation
  • Larval development
  • Nicrophorus
  • Population dynamics
  • Reproduction

ASJC Scopus subject areas

  • Insect Science
  • Environmental Science(all)

Cite this

Altitudinal variation in body size and population density of Nicrophorus investigator (Coleoptera : Silphidae). / Smith, Rosemary J.; Hines, Amy; Richmond, Stephanie; Merrick, Melissa J; Drew, Allison; Fargo, Rachelle.

In: Environmental Entomology, Vol. 29, No. 2, 04.2000, p. 290-298.

Research output: Contribution to journalArticle

Smith, Rosemary J. ; Hines, Amy ; Richmond, Stephanie ; Merrick, Melissa J ; Drew, Allison ; Fargo, Rachelle. / Altitudinal variation in body size and population density of Nicrophorus investigator (Coleoptera : Silphidae). In: Environmental Entomology. 2000 ; Vol. 29, No. 2. pp. 290-298.
@article{ef5020511b61467d9c29621e9ee1b1a9,
title = "Altitudinal variation in body size and population density of Nicrophorus investigator (Coleoptera: Silphidae)",
abstract = "Increasing altitude may influence insect communities, population sizes, life-histories, and morphology. Nicrophorus investigator Zetterstedt, a holarctic species, occurs over a range of elevations in the western Rocky Mountains of North America. This study examines changes in population density, seasonal activity periods, morphology, and reproduction at three sites over an elevational gradient in the southern Rocky Mountains of Colorado. N. investigator population sizes varied yearly at both low (≃2,800 m) and high (≃3,200 m) elevations, but were always greater at the lower elevations. Adult activity at all sites began in late June, remained relatively constant throughout July, and declined by late August. Elytron length was highly correlated both with body mass and pronotum width. There was no difference in elytron length between males and females (within years sites). However elytron length was significantly greater in 5 out of 6 yr at the higher elevation site, and in 1999, at two additional low and high elevation sites in separate drainages. Beetles at the low and high elevation sites differed slightly in their reproductive strategies under captive conditions at the high elevation the number of larvae did not increase with carcass size thus larvae from larger carcasses weighed more than larvae reared on smaller carcasses. At the low elevation, brood size tended to increase with carcass mass, resulting in similar-sized larvae across all carcass masses. On average, brood growth efficiency (total brood grams/carcass grams) was higher at the higher elevation, perhaps explained by developing at lower temperature. These results indicate that both life-history strategies and developmental processes may be involved in the elevational variation seen in this species.",
keywords = "Body size, Elevation, Larval development, Nicrophorus, Population dynamics, Reproduction",
author = "Smith, {Rosemary J.} and Amy Hines and Stephanie Richmond and Merrick, {Melissa J} and Allison Drew and Rachelle Fargo",
year = "2000",
month = "4",
language = "English (US)",
volume = "29",
pages = "290--298",
journal = "Environmental Entomology",
issn = "0046-225X",
publisher = "Entomological Society of America",
number = "2",

}

TY - JOUR

T1 - Altitudinal variation in body size and population density of Nicrophorus investigator (Coleoptera

T2 - Silphidae)

AU - Smith, Rosemary J.

AU - Hines, Amy

AU - Richmond, Stephanie

AU - Merrick, Melissa J

AU - Drew, Allison

AU - Fargo, Rachelle

PY - 2000/4

Y1 - 2000/4

N2 - Increasing altitude may influence insect communities, population sizes, life-histories, and morphology. Nicrophorus investigator Zetterstedt, a holarctic species, occurs over a range of elevations in the western Rocky Mountains of North America. This study examines changes in population density, seasonal activity periods, morphology, and reproduction at three sites over an elevational gradient in the southern Rocky Mountains of Colorado. N. investigator population sizes varied yearly at both low (≃2,800 m) and high (≃3,200 m) elevations, but were always greater at the lower elevations. Adult activity at all sites began in late June, remained relatively constant throughout July, and declined by late August. Elytron length was highly correlated both with body mass and pronotum width. There was no difference in elytron length between males and females (within years sites). However elytron length was significantly greater in 5 out of 6 yr at the higher elevation site, and in 1999, at two additional low and high elevation sites in separate drainages. Beetles at the low and high elevation sites differed slightly in their reproductive strategies under captive conditions at the high elevation the number of larvae did not increase with carcass size thus larvae from larger carcasses weighed more than larvae reared on smaller carcasses. At the low elevation, brood size tended to increase with carcass mass, resulting in similar-sized larvae across all carcass masses. On average, brood growth efficiency (total brood grams/carcass grams) was higher at the higher elevation, perhaps explained by developing at lower temperature. These results indicate that both life-history strategies and developmental processes may be involved in the elevational variation seen in this species.

AB - Increasing altitude may influence insect communities, population sizes, life-histories, and morphology. Nicrophorus investigator Zetterstedt, a holarctic species, occurs over a range of elevations in the western Rocky Mountains of North America. This study examines changes in population density, seasonal activity periods, morphology, and reproduction at three sites over an elevational gradient in the southern Rocky Mountains of Colorado. N. investigator population sizes varied yearly at both low (≃2,800 m) and high (≃3,200 m) elevations, but were always greater at the lower elevations. Adult activity at all sites began in late June, remained relatively constant throughout July, and declined by late August. Elytron length was highly correlated both with body mass and pronotum width. There was no difference in elytron length between males and females (within years sites). However elytron length was significantly greater in 5 out of 6 yr at the higher elevation site, and in 1999, at two additional low and high elevation sites in separate drainages. Beetles at the low and high elevation sites differed slightly in their reproductive strategies under captive conditions at the high elevation the number of larvae did not increase with carcass size thus larvae from larger carcasses weighed more than larvae reared on smaller carcasses. At the low elevation, brood size tended to increase with carcass mass, resulting in similar-sized larvae across all carcass masses. On average, brood growth efficiency (total brood grams/carcass grams) was higher at the higher elevation, perhaps explained by developing at lower temperature. These results indicate that both life-history strategies and developmental processes may be involved in the elevational variation seen in this species.

KW - Body size

KW - Elevation

KW - Larval development

KW - Nicrophorus

KW - Population dynamics

KW - Reproduction

UR - http://www.scopus.com/inward/record.url?scp=0033854395&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033854395&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033854395

VL - 29

SP - 290

EP - 298

JO - Environmental Entomology

JF - Environmental Entomology

SN - 0046-225X

IS - 2

ER -