Using empirical and mechanistic models to assess global warming threats to leatherback sea turtles

2014 ◽  
Vol 501 ◽  
pp. 265-278 ◽  
Author(s):  
PN Dudley ◽  
WP Porter
Keyword(s):  
Global Warming ◽  
Sea Turtles ◽  
Mechanistic Models ◽  
Leatherback Sea Turtles ◽  
Empirical And Mechanistic Models

Analysis of Ammonia Volatilization Loss from a Paddy Soil With Empirical and Mechanistic Models

2021 ◽  
pp. 2000230
Author(s):  
Wen‐Ming Xie ◽  
Pei‐Kun Yuan ◽  
You Ma ◽  
Wei‐Ming Shi ◽  
Hai‐Lin Zhang ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ammonia Volatilization ◽  
Mechanistic Models ◽  
Empirical And Mechanistic Models

Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models

2011 ◽  
Vol 91 (2) ◽  
pp. 305-321 ◽  
Author(s):  
Aklilu Alemu ◽  
K. H. Ominski ◽  
E. Kebreab
Keyword(s):  
Beef Cattle ◽  
Methane Emissions ◽  
Mechanistic Models ◽  
Tier 2 ◽  
Cattle Population ◽  
Production Environment ◽  
Feed Composition ◽  
Enteric Methane ◽  
Empirical And Mechanistic Models ◽  
Enteric Methane Emissions

Alemu, A. W., Ominski, K. H. and Kebreab, E. 2011. Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models. Can. J. Anim. Sci. 91: 305–321. The objective of this study was to estimate and assess trends in enteric methane (CH4) emissions from the Manitoba beef cattle population from the base year of 1990 to 2008 using mathematical models. Two empirical (statistical) models: Intergovernmental Panel on Climate Change (IPCC) Tier 2 and a nonlinear equation (Ellis), and two dynamic mechanistic models: MOLLY (v3) and COWPOLL were used. Beef cattle in Manitoba were categorized in to 29 distinct subcategories based on management practice, physiological status, gender, age and production environment. Data on animal performance, feeding and management practices and feed composition were collected from the literature as well as from provincial and national sources. Estimates of total enteric CH4 production from the Manitoba beef cattle population varied between 0.9 and 2.4 Mt CO2 eq. from 1990 to 2008. Regardless of the type of models used, average CH4 emissions for 2008 were estimated to be 45.2% higher than 1990 levels. More specifically, CH4 emissions tended to increase between 1990 and 1996. Emissions were relatively stable between 1996 and 2002, increased between 2003 and 2005, but declined by 13.2% between 2005 and 2008, following the same trend as that observed in the beef cattle population. Models varied in their estimates of CH4 conversion rate (Ym, percent gross energy intake), emission factor (kg CH4 head−1 yr−1) and CH4 production. Total CH4 production estimates ranged from 1.2 to 2.0 Mt CO2 eq. for IPCC Tier 2, from 0.9 to 1.5 Mt CO2 eq. for Ellis, from 1.3 to 2.1 Mt CO2 eq. for COWPOLL and from 1.5 to 2.4 Mt CO2 eq. for MOLLY. The results indicate that enteric CH4 estimates and emission trends in Manitoba were influenced by the type of model and beef cattle population. As such, it is necessary to use appropriate models for reliable estimates for enteric CH4 inventory. A more robust approach may be to integrate different models by using mechanistic models to estimate regional Ym values, which may then be used as input for the IPCC Tier 2 model.

COCCIDIAL INFECTION OF THE ADRENAL GLANDS OF LEATHERBACK SEA TURTLES (DERMOCHELYS CORIACEA)

2016 ◽  
Vol 52 (4) ◽  
pp. 874-882 ◽  
Author(s):  
Sara D. Ferguson ◽  
James F. X. Wellehan ◽  
Salvatore Frasca ◽  
Charles J. Innis ◽  
Heather S. Harris ◽  
...  
Keyword(s):  
Adrenal Glands ◽  
Sea Turtles ◽  
Dermochelys Coriacea ◽  
Coccidial Infection ◽  
Leatherback Sea Turtles

Tursiocola neliana sp. nov (Bacillariophyceae) epizoic on South African leatherback sea turtles (Dermochelys coriacea) and new observations on the genus Tursiocola

Phytotaxa ◽  
2020 ◽  
Vol 453 (1) ◽  
pp. 1-15 ◽  
Author(s):  
ROKSANA MAJEWSKA
Keyword(s):  
Sea Turtles ◽  
Central Area ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Eastern Coast ◽  
New Taxon ◽  
Freshwater Turtles ◽  
Diatom Genus ◽  
Leatherback Sea Turtles ◽  
Internal Side

Tursiocola, a presumably exclusively epizoic diatom genus, comprises species found on various aquatic animals such as cetaceans, manatees, and marine and freshwater turtles. The genus is characterised by linear or lanceolate valves with well-developed pseudosepta at both poles, a valvocopula with three pairs of siliceous tabs, and a butterfly-like structure extending from the central nodule on the internal side of the valve. The current study describes a novel species of Tursiocola, T. neliana Majewska sp. nov. that grows epizoically on leatherback sea turtles from the Eastern Coast of South Africa based on detailed observations using light and scanning electron microscopy. The new taxon resembles the other currently known sea turtle-associated Tursiocola species in possessing relatively small, slightly heteropolar valves with acute apices and a strongly reduced butterfly structure on the internal side. However, T. neliana differs from all other members of the genus in being distinctly dorsiventral, with a clearly bowtie-shaped central area, unequal stria density on two sides of the raphe-sternum, and up to 8 areolae per stria. The description of the new taxon brings the total number of the sea turtle-associated Tursiocola species known so far up to four. An emended description of Tursiocola is proposed based on the new observations presented in this and other recent reports. Furthermore, the current understanding of the genus ecology is summarised.

Reproductive Biology of Atlantic Leatherback Sea Turtles at Sandy Point, St. Croix: The First 30 Years

2017 ◽  
Vol 16 (1) ◽  
pp. 29-43 ◽  
Author(s):  
Jeanne A. Garner ◽  
Duncan S. MacKenzie ◽  
Delbert Gatlin
Keyword(s):  
Reproductive Biology ◽  
Sea Turtles ◽  
Leatherback Sea Turtles
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