| Bioenergetic components of reproductive effort in viviparous snakes: Costs of vitellogenesis exceed costs of pregnancy. | |
| | |
MedLine Citation:
|
PMID: 21884815 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
Reproductive effort has been defined as the proportion of an organism's energy budget that is allocated to reproduction over a biologically meaningful time period. Historically, studies of reproductive bioenergetics considered energy content of gametes, but not costs of gamete production. Although metabolic costs of vitellogenesis (MCV) fundamentally reflect the primary bioenergetic cost of reproductive allocation in female reptiles, the few investigations that have considered costs of reproductive allocation have focused on metabolic costs of pregnancy (MCP) in viviparous species. We define MCP as energetic costs incurred by pregnant females, including all costs of maintaining gestation conditions necessary for embryogenesis. MCP by our definition does not include fetal costs of embryogenesis. We measured metabolic rates in five species of viviparous snakes (Agkistrodon contortrix, Boa constrictor, Eryx colubrinus, Nerodia sipedon, and Thamnophis sirtalis) during vitellogenesis and pregnancy in order to estimate MCV and MCP. Across all species, MCV were responsible for 30% increases in maternal metabolism. Phylogenetically-independent contrasts showed that MCV were significantly greater in B. constrictor than in other species, likely because B. constrictor yolk energy content was greater than that of other species. Estimates of MCP were not significantly different from zero in any species. In viviparous snakes, MCV appear to represent significant bioenergetic expenditures, while MCP do not. We suggest that MCV, together with yolk energy content, represent the most significant component of reptilian reproductive effort, and therefore deserve greater attention than MCP in studies of reptilian reproductive bioenergetics. |
| | |
Authors:
|
James U Van Dyke; Steven J Beaupre |
Related Documents
:
|
22487725 - Is the measurement of anti-müllerian hormone essential? 16728075 - Total ascorbate and dehydroascorbate concentrations in porcine ovarian stroma, follicle... 19356755 - Spontaneous ovarian hyperstimulation syndrome and pituitary adenoma: incidental pregnan... 19562065 - Unruptured ovarian pregnancy following in-vitro fertilization: missed diagnosis followe... 7431295 - Intrinsic and extrinsic factors affecting the viability of mus caroli x m. musculus hyb... 20639475 - Pulse pressure and arterial compliance prior to pregnancy and the development of compli... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-8-23 |
Journal Detail:
|
Title: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology Volume: - ISSN: 1531-4332 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
|
Created Date: 2011-9-2 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9806096 Medline TA: Comp Biochem Physiol A Mol Integr Physiol Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2011. Published by Elsevier Inc. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Neuronal polarization and the cytoskeleton.
Next Document: Pharmacogenetics: past, present and future.