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https://www.readbyqxmd.com/read/28219019/inferring-physiological-energetics-of-loggerhead-turtle-caretta-caretta-from-existing-data-using-a-general-metabolic-theory
#1
Nina Marn, S A L M Kooijman, Marko Jusup, Tarzan Legović, Tin Klanjšček
Loggerhead turtle is an endangered sea turtle species with a migratory lifestyle and worldwide distribution, experiencing markedly different habitats throughout its lifetime. Environmental conditions, especially food availability and temperature, constrain the acquisition and the use of available energy, thus affecting physiological processes such as growth, maturation, and reproduction. These physiological processes at the population level determine survival, fecundity, and ultimately the population growth rate-a key indicator of the success of conservation efforts...
February 3, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28210809/growth-dynamics-of-juvenile-loggerhead-sea-turtles-undergoing-an-ontogenetic-habitat-shift
#2
Matthew D Ramirez, Larisa Avens, Jeffrey A Seminoff, Lisa R Goshe, Selina S Heppell
Ontogenetic niche theory predicts that individuals may undergo one or more changes in habitat or diet throughout their lifetime to maintain optimal growth rates, or to optimize trade-offs between mortality risk and growth. We combine skeletochronological and stable nitrogen isotope (δ(15)N) analyses of sea turtle humeri (n = 61) to characterize the growth dynamics of juvenile loggerhead sea turtles (Caretta caretta) during an oceanic-to-neritic ontogenetic shift. The primary objective of this study was to determine how ontogenetic niche theory extends to sea turtles, and to individuals with different patterns of resource use (discrete shifters, n = 23; facultative shifters n = 14; non-shifters, n = 24)...
February 16, 2017: Oecologia
https://www.readbyqxmd.com/read/28202810/how-numbers-of-nesting-sea-turtles-can-be-overestimated-by-nearly-a-factor-of-two
#3
Nicole Esteban, Jeanne A Mortimer, Graeme C Hays
Estimating the absolute number of individuals in populations and their fecundity is central to understanding the ecosystem role of species and their population dynamics as well as allowing informed conservation management for endangered species. Estimates of abundance and fecundity are often difficult to obtain for rare or cryptic species. Yet, in addition, here we show for a charismatic group, sea turtles, that are neither cryptic nor rare and whose nesting is easy to observe, that the traditional approach of direct observations of nesting has likely led to a gross overestimation of the number of individuals in populations and underestimation of their fecundity...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28198382/re-shifting-the-ecological-baseline-for-the-overexploited-mediterranean-red-coral
#4
J Garrabou, E Sala, C Linares, J B Ledoux, I Montero-Serra, J M Dominici, S Kipson, N Teixidó, E Cebrian, D K Kersting, J G Harmelin
Overexploitation leads to the ecological extinction of many oceanic species. The depletion of historical abundances of large animals, such as whales and sea turtles, is well known. However, the magnitude of the historical overfishing of exploited invertebrates is unclear. The lack of rigorous baseline data limits the implementation of efficient management and conservation plans in the marine realm. The precious Mediterranean red coral Corallium rubrum has been intensively exploited since antiquity for its use in jewellery...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28192472/identification-and-evaluation-of-semiochemicals-for-the-biological-control-of-the-beetle-omorgus-suberosus-f-coleoptera-trogidae-a-facultative-predator-of-eggs-of-the-sea-turtle-lepidochelys-olivacea-eschscholtz
#5
Vieyle Cortez, José R Verdú, Antonio J Ortiz, Gonzalo Halffter
The beetle Omorgus suberosus (F.) is a facultative predator of eggs of the olive ridley turtle Lepidochelys olivacea (Eschscholtz). Laboratory and field investigations were conducted in order to characterize volatile attractants of O. suberosus and to explore the potential for application of these volatiles in a selective mass trapping method. Headspace sorptive extraction (HSSE) coupled to thermo-desorption gas chromatography-mass spectrometry (TD-GC-MS) analysis of the volatile constituents from beetles or turtle nests revealed 24 potential compounds...
2017: PloS One
https://www.readbyqxmd.com/read/28187181/anti-predator-meshing-may-provide-greater-protection-for-sea-turtle-nests-than-predator-removal
#6
Julie M O'Connor, Colin J Limpus, Kate M Hofmeister, Benjamin L Allen, Scott E Burnett
The problem of how to protect sea turtle nests from terrestrial predators is of worldwide concern. On Queensland's southern Sunshine Coast, depredation of turtle nests by the introduced European red fox (Vulpes vulpes) has been recorded as the primary terrestrial cause of egg and hatchling mortality. We investigated the impact of foxes on the nests of the loggerhead turtle (Caretta caretta) and occasional green turtle (Chelonia mydas) over ten nesting seasons. Meshing of nests with fox exclusion devices (FEDs) was undertaken in all years accompanied by lethal fox control in the first five-year period, but not in the second five-year period...
2017: PloS One
https://www.readbyqxmd.com/read/28183028/estimates-of-the-non-market-value-of-sea-turtles-in-tobago-using-stated-preference-techniques
#7
Michelle Cazabon-Mannette, Peter W Schuhmann, Adrian Hailey, Julia Horrocks
Economic benefits are derived from sea turtle tourism all over the world. Sea turtles also add value to underwater recreation and convey non-use values. This study examines the non-market value of sea turtles in Tobago. We use a choice experiment to estimate the value of sea turtle encounters to recreational SCUBA divers and the contingent valuation method to estimate the value of sea turtles to international tourists. Results indicate that turtle encounters were the most important dive attribute among those examined...
February 6, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28179520/population-viability-at-extreme-sex-ratio-skews-produced-by-temperature-dependent-sex-determination
#8
Graeme C Hays, Antonios D Mazaris, Gail Schofield, Jacques-Olivier Laloë
For species with temperature-dependent sex determination (TSD) there is the fear that rising temperatures may lead to single-sex populations and population extinction. We show that for sea turtles, a major group exhibiting TSD, these concerns are currently unfounded but may become important under extreme climate warming scenarios. We show how highly female-biased sex ratios in developing eggs translate into much more balanced operational sex ratios so that adult male numbers in populations around the world are unlikely to be limiting...
February 8, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28169181/reproductive-disorders-and-perinatology-of-sea-turtles
#9
REVIEW
Filippo Spadola, Manuel Morici, Mario Santoro, Matteo Oliveri, Gianni Insacco
Sea turtles' reproductive disorders are underdiagnosed; but potentially several diseases may affect gonads, genitalia, and annexes. Viruses, bacteria, and parasites may cause countless disorders; but more frequently the cause is traumatic or linked to human activities. Furthermore, veterinary management of the nest is of paramount importance as well as the care of newborns (also in captivity). This article gives an overview on the methods used to manage nests and reproductive activities of these endangered chelonians species...
February 4, 2017: Veterinary Clinics of North America. Exotic Animal Practice
https://www.readbyqxmd.com/read/28133395/linking-loggerhead-locations-using-multiple-methods-to-determine-the-origin-of-sea-turtles-in-feeding-grounds
#10
ALan F Rees, Carlos Carreras, Annette C Broderick, Dimitris Margaritoulis, Thomas B Stringell, Brendan J Godley
Many marine megavertebrate taxa, including sea turtles, disperse widely from their hatching or birthing locations but display natal homing as adults. We used flipper tagging, satellite tracking and genetics to identify the origin of loggerhead turtles living in Amvrakikos Gulf, Greece. This location has been identified as hosting regionally important numbers of large-juvenile to adult sized turtles that display long-term residency and/or association to the area, and also presents a male biased sex ratio for adults...
2017: Marine Biology
https://www.readbyqxmd.com/read/28114412/to-swim-or-not-to-swim-potential-transmission-of-balaenophilus-manatorum-copepoda-harpacticoida-in-marine-turtles
#11
Francesc Domènech, Jesús Tomás, José Luis Crespo-Picazo, Daniel García-Párraga, Juan Antonio Raga, Francisco Javier Aznar
Species of Balaenophilus are the only harpacticoid copepods that exhibit a widespread, obligate association with vertebrates, i.e., B. unisetus with whales and B. manatorum with marine turtles and manatees. In the western Mediterranean, juveniles of the loggerhead sea turtle, Caretta caretta are the only available hosts for B. manatorum, which has been found occurring at high prevalence (>80%) on them. A key question is how these epibionts are transmitted from host to host. We investigated this issue based on experiments with live specimens of B...
2017: PloS One
https://www.readbyqxmd.com/read/28092958/moments-of-von-mises-and-fisher-distributions-and-applications
#12
Thomas Hillen, Kevin J Painter, Amanda C Swan, Albert D Murtha
The von Mises and Fisher distributions are spherical analogues to the Normal distribution on the unit circle and unit sphere, respectively. The computation of their moments, and in particular the second moment, usually involves solving tedious trigonometric integrals. Here we present a new method to compute the moments of spherical distributions, based on the divergence theorem. This method allows a clear derivation of the second moments and can be easily generalized to higher dimensions. In particular we note that, to our knowledge, the variance-covariance matrix of the three dimensional Fisher distribution has not previously been explicitly computed...
June 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/28075017/intrapopulation-variability-in-the-timing-of-ontogenetic-habitat-shifts-in-sea-turtles-revealed-using-%C3%AE-15-n-values-from-bone-growth-rings
#13
Calandra N Turner Tomaszewicz, Jeffrey A Seminoff, S Hoyt Peckham, Larisa Avens, Carolyn M Kurle
Determining location and timing of ontogenetic shifts in the habitat use of highly migratory species, along with possible intrapopulation variation in these shifts, is essential for understanding mechanisms driving alternate life histories and assessing overall population trends. Measuring variations in multi-year habitat-use patterns is especially difficult for remote oceanic species. To investigate the potential for differential habitat use among migratory marine vertebrates, we measured the naturally occurring stable nitrogen isotope (δ(15) N) patterns that differentiate distinct ocean regions to create a 'regional isotope characterization', analysed the δ(15) N values from annual bone growth layer rings from dead-stranded animals, and then combined the bone and regional isotope data to track individual animal movement patterns over multiple years...
January 11, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28069277/pathologies-of-the-digestive-system-caused-by-marine-debris-in-chelonia-mydas
#14
Hassan Jerdy, Max Rondon Werneck, Maria Aparecida da Silva, Rachel Bittencourt Ribeiro, Mariah Bianchi, Eduardo Shimoda, Eulógio Carlos Queiróz de Carvalho
The growth of human population and deficient pollution control measures pose significant challenge to the environment. Despite conservation efforts, all sea turtle species are at some risk of extinction. The present study investigated the effect of marine debris on the gastrointestinal tract of green turtles in southeastern Brazil. Of the 777 animals evaluated, 290 showed marine debris in one segment of the gastrointestinal tract. The presence of these materials in the gastrointestinal tract may be harmful, independent of the segment involved, and increases the risk of impaction...
January 6, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28054446/the-influence-of-incubation-temperature-on-sea-turtle-hatchling-quality
#15
REVIEW
David T Booth
Since the 1980s it has been known that incubation temperature influences the sex ratio of sea turtle hatchlings emerging from their nests, and there has been much speculation on how global climate change might threaten sea turtle populations by raising nest temperatures and causing highly female biased hatchling sex ratios. More recently, studies have indicated that incubation temperature can also influence the size and locomotor performance of sea turtle hatchlings. Here I review recent studies that have explored the influence of incubation temperature on sea turtle hatchling quality in terms of hatchling morphology and locomotor performance...
January 5, 2017: Integrative Zoology
https://www.readbyqxmd.com/read/28043787/-clusters-of-fusarium-solani-infection-in-juvenile-captive-born-caretta-caretta-sea-turtles
#16
M Garcia-Hartmann, C Hennequin, S Catteau, C Béatini, V Blanc
Various yeasts and filamentous fungi are described as the cause of infection in sea turtles. Among them, Fusarium solani is responsible both for superficial and invasive infection in weakened adults (capture, stranding), and wild nest contamination, causing massive losses during hatching. We illustrate the pathogenicity of this fungus in sea turtles, through our experience with the species Caretta caretta (loggerhead turtle) and its reproduction, which was obtained for the first time in 2010 at the marine park Marineland, Antibes and renewed in 2011 and 2013...
December 30, 2016: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/28039527/individual-level-behavioral-responses-of-immature-green-turtles-to-snorkeler-disturbance
#17
Lucas P Griffin, Jacob W Brownscombe, Tyler O Gagné, Alexander D M Wilson, Steven J Cooke, Andy J Danylchuk
Despite many positive benefits of ecotourism, increased human encounters with wildlife may have detrimental effects on wild animals. As charismatic megafauna, nesting and foraging sea turtles are increasingly the focus of ecotourism activities. The purpose of our study was to quantify the behavioral responses of immature green turtles (Chelonia mydas) to disturbance by snorkelers, and to investigate whether turtles have individual-level responses to snorkeler disturbance. Using a standardized disturbance stimulus in the field, we recorded turtle behaviors pre- and post-disturbance by snorkelers...
December 30, 2016: Oecologia
https://www.readbyqxmd.com/read/28025743/relationship-between-organochlorine-pesticides-and-stress-indicators-in-hawksbill-sea-turtle-eretmochelys-imbricata-nesting-at-punta-xen-campeche-southern-gulf-of-mexico
#18
Nelly Tremblay, Alejandro Ortíz Arana, Mauricio González Jáuregui, Jaime Rendón-von Osten
Data on the impact of environmental pollution on the homeostasis of sea turtles remains scarce, particularly in the Southern Gulf of Mexico. As many municipalities along the coastline of the Yucatan Peninsula do not rely on a waste treatment plant, these organisms could be particularly vulnerable. We searched for relationships between the presence of organochlorine pesticides (OCP) and the level of several oxidative and pollutant stress indicators of the hawksbill sea turtle (Eretmochelys imbricata) during the 2010 nesting season at Punta Xen (Campeche, Mexico)...
December 26, 2016: Ecotoxicology
https://www.readbyqxmd.com/read/28009107/detection-of-salmonella-enterica-serovar-montevideo-and-newport-in-free-ranging-sea-turtles-and-beach-sand-in-the-caribbean-and-persistence-in-sand-and-seawater-microcosms
#19
A-K Ives, E Antaki, K Stewart, S Francis, M T Jay-Russell, F Sithole, M T Kearney, M J Griffin, E Soto
Salmonellae are Gram-negative zoonotic bacteria that are frequently part of the normal reptilian gastrointestinal flora. The main objective of this project was to estimate the prevalence of non-typhoidal Salmonella enterica in the nesting and foraging populations of sea turtles on St. Kitts and in sand from known nesting beaches. Results suggest a higher prevalence of Salmonella in nesting leatherback sea turtles compared with foraging green and hawksbill sea turtles. Salmonella was cultured from 2/9 and identified by molecular diagnostic methods in 3/9 leatherback sea turtle samples...
December 23, 2016: Zoonoses and Public Health
https://www.readbyqxmd.com/read/27974518/passive-drift-or-active-swimming-in-marine-organisms
#20
Nathan F Putman, Rick Lumpkin, Alexander E Sacco, Katherine L Mansfield
Predictions of organismal movements in a fluid require knowing the fluid's velocity and potential contributions of the organism's behaviour (e.g. swimming or flying). While theoretical aspects of this work are reasonably well-developed, field-based validation is challenging. A much-needed study recently published by Briscoe and colleagues in Proceedings of the Royal Society B compared movements and distribution of satellite-tracked juvenile sea turtles to virtual particles released in a data-assimilating hindcast ocean circulation model...
December 14, 2016: Proceedings. Biological Sciences
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