Abstract Age-specific rates of survival and reproduc-tion in iteroparous organisms remain a key issue in pop-ulation ecology. How patterns of survival vary with age in large herbivores is well known; much less is known regarding age-specific patterns of reproduction. The se-nescence hypothesis predi...
Other Authors: | |
---|---|
Format: | Text |
Language: | English |
Subjects: | |
Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.7634 http://folk.uio.no/atlemy/pdf/art26.pdf |
id |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.456.7634 |
---|---|
record_format |
openpolar |
spelling |
ftciteseerx:oai:CiteSeerX.psu:10.1.1.456.7634 2023-05-15T18:04:20+02:00 The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.7634 http://folk.uio.no/atlemy/pdf/art26.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.7634 http://folk.uio.no/atlemy/pdf/art26.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://folk.uio.no/atlemy/pdf/art26.pdf text ftciteseerx 2016-01-08T06:14:54Z Abstract Age-specific rates of survival and reproduc-tion in iteroparous organisms remain a key issue in pop-ulation ecology. How patterns of survival vary with age in large herbivores is well known; much less is known regarding age-specific patterns of reproduction. The se-nescence hypothesis predicts a progressive loss of func-tion accompanied by decreased performance with age. The terminal investment hypothesis predicts that the pro-portion of resources a mother invests (i.e. effort relative to costs) is expected to increase toward the end of her life-span, when the number of offspring she can expect to rear in the future is low. Assuming that the costs re-main stable, the terminal investment hypothesis predicts increased reproductive effort with age. We used data on body weight of 1,956 semi-domestic reindeer (Rangifer tarandus) calves from females with known age and weight to test these two (not mutually exclusive) hypoth-eses. Body weight of calves clearly decreased after 7 years of age was reached (also after controlling for female body weight), which was in support of the senes-cence hypothesis. We can conclude that either the termi-nal investment hypothesis is wrong, and/or the reproduc-tive costs increase with age in female reindeer. Text Rangifer tarandus Unknown Tive ENVELOPE(12.480,12.480,65.107,65.107) |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Abstract Age-specific rates of survival and reproduc-tion in iteroparous organisms remain a key issue in pop-ulation ecology. How patterns of survival vary with age in large herbivores is well known; much less is known regarding age-specific patterns of reproduction. The se-nescence hypothesis predicts a progressive loss of func-tion accompanied by decreased performance with age. The terminal investment hypothesis predicts that the pro-portion of resources a mother invests (i.e. effort relative to costs) is expected to increase toward the end of her life-span, when the number of offspring she can expect to rear in the future is low. Assuming that the costs re-main stable, the terminal investment hypothesis predicts increased reproductive effort with age. We used data on body weight of 1,956 semi-domestic reindeer (Rangifer tarandus) calves from females with known age and weight to test these two (not mutually exclusive) hypoth-eses. Body weight of calves clearly decreased after 7 years of age was reached (also after controlling for female body weight), which was in support of the senes-cence hypothesis. We can conclude that either the termi-nal investment hypothesis is wrong, and/or the reproduc-tive costs increase with age in female reindeer. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.7634 http://folk.uio.no/atlemy/pdf/art26.pdf |
long_lat |
ENVELOPE(12.480,12.480,65.107,65.107) |
geographic |
Tive |
geographic_facet |
Tive |
genre |
Rangifer tarandus |
genre_facet |
Rangifer tarandus |
op_source |
http://folk.uio.no/atlemy/pdf/art26.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.456.7634 http://folk.uio.no/atlemy/pdf/art26.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766175686451527680 |