Comparison of optimal foraging versus life-history decisions during nestling care in Lincoln's SparrowsMelospiza lincolniithrough stable isotope analysis

Ibis ◽  
2014 ◽  
Vol 156 (2) ◽  
pp. 424-432 ◽  
Author(s):  
Michael Beaulieu ◽  
Keith W. Sockman
Keyword(s):  
Life History ◽  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Optimal Foraging ◽  
Isotope Analysis

Variation in morphology and life-history strategy of an exploited sparid fish

2016 ◽  
Vol 67 (10) ◽  
pp. 1434 ◽  
Author(s):  
D. M. Parsons ◽  
M. A. Morrison ◽  
B. M. Gillanders ◽  
K. D. Clements ◽  
S. J. Bury ◽  
...  
Keyword(s):  
Life History ◽  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Fishery Management ◽  
Isotope Analysis ◽  
Life History Strategy ◽  
Rocky Reef ◽  
Discrete Groups ◽  
Otolith Chemistry ◽  
Functional Aspects

Defining appropriate management units to balance productivity and yield of exploited species is fundamental to effective resource management. Anecdotal and tag–recapture information related to morphology, movement behaviour and life-history strategy suggest that separate groups of snapper (Chrysophrys auratus) exist in the Hauraki Gulf, New Zealand. To address the existence of discrete groups, we examined morphology, meristics and otolith chemistry from snapper collected throughout the Hauraki Gulf. We also used tag–recapture information, stable isotope analysis and interpreted functional aspects of morphology and meristics data to understand potential life-history strategy differences. Snapper from rocky reef habitats did not display morphology and meristic features distinct from snapper from soft sediment habitats and differences in otolith chemistry and stable isotope ratios could respectively be explained by a locational influence and predominance of kelp in rocky reef food webs. Conversely, snapper collected from a known spawning area had distinct morphological and meristic features consistent with semi–pelagic sparids and stable isotope analysis also indicated a potentially more pelagic and higher trophic-level diet. Maintenance of population complexity such as this is generally beneficial to fish populations, and can be achieved by revisiting the spatial units used for fishery management.

scholarly journals Stable isotope analysis of vertebrae reveals ontogenetic changes in habitat in an endothermic pelagic shark

2015 ◽  
Vol 282 (1799) ◽  
pp. 20141446 ◽  
Author(s):  
Aaron B. Carlisle ◽  
Kenneth J. Goldman ◽  
Steven Y. Litvin ◽  
Daniel J. Madigan ◽  
Jennifer S. Bigman ◽  
...  
Keyword(s):  
Life History ◽  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Prey Availability ◽  
Isotope Analysis ◽  
Isotopic Niche ◽  
Mixing Models ◽  
Ontogenetic Shift ◽  
Ontogenetic Changes ◽  
History Of

Ontogenetic changes in habitat are driven by shifting life-history requirements and play an important role in population dynamics. However, large portions of the life history of many pelagic species are still poorly understood or unknown. We used a novel combination of stable isotope analysis of vertebral annuli, Bayesian mixing models, isoscapes and electronic tag data to reconstruct ontogenetic patterns of habitat and resource use in a pelagic apex predator, the salmon shark ( Lamna ditropis ). Results identified the North Pacific Transition Zone as the major nursery area for salmon sharks and revealed an ontogenetic shift around the age of maturity from oceanic to increased use of neritic habitats. The nursery habitat may reflect trade-offs between prey availability, predation pressure and thermal constraints on juvenile endothermic sharks. The ontogenetic shift in habitat coincided with a reduction of isotopic niche, possibly reflecting specialization upon particular prey or habitats. Using tagging data to inform Bayesian isotopic mixing models revealed that adult sharks primarily use neritic habitats of Alaska yet receive a trophic subsidy from oceanic habitats. Integrating the multiple methods used here provides a powerful approach to retrospectively study the ecology and life history of migratory species throughout their ontogeny.

Development of an In-Situ Mass Spectrometer for Stable Isotope Analysis

2003 ◽  
Author(s):  
R. T. Short ◽  
Gottfried P. Kibelka ◽  
Robert H. Byrne ◽  
David Hollander
Keyword(s):  
Stable Isotope ◽  
Mass Spectrometer ◽  
Stable Isotope Analysis ◽  
Isotope Analysis

LATE HOLOCENE HYDROCLIMATE RECONSTRUCTION FROM LAKE CHICHOJ, GUATEMALA USING STABLE ISOTOPE ANALYSIS OF SEDIMENTS

2017 ◽  
Author(s):  
Peter Mortensen ◽  
◽  
Nathan D. Stansell ◽  
Byron A. Steinman ◽  
Gilles Y. Brocard ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Late Holocene ◽  
Isotope Analysis
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