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https://www.readbyqxmd.com/read/28333937/variability-in-age-and-size-at-maturation-reproductive-longevity-and-long-term-growth-dynamics-for-kemp-s-ridley-sea-turtles-in-the-gulf-of-mexico
#1
Larisa Avens, Lisa R Goshe, Lewis Coggins, Donna J Shaver, Ben Higgins, Andre M Landry, Rhonda Bailey
Effective management of protected sea turtle populations requires knowledge not only of mean values for demographic and life-history parameters, but also temporal and spatial trends, variability, and underlying causes. For endangered Kemp's ridley sea turtles (Lepidochelys kempii), the need for baseline information of this type has been emphasized during attempts to understand causes underlying the recent truncation in the recovery trajectory for nesting females. To provide insight into variability in age and size at sexual maturation (ASM and SSM) and long-term growth patterns likely to influence population trends, we conducted skeletochronological analysis of humerus bones from 333 Kemp's ridleys stranded throughout the Gulf of Mexico (GOM) from 1993 to 2010...
2017: PloS One
https://www.readbyqxmd.com/read/28331802/molecular-epidemiology-and-pathology-of-spirorchiid-infection-in-green-sea-turtles-chelonia-mydas
#2
Phoebe A Chapman, Helen Owen, Mark Flint, Ricardo J Soares Magalhães, Rebecca J Traub, Thomas H Cribb, Myat T Kyaw-Tanner, Paul C Mills
Spirorchiid blood fluke infections affect endangered turtle populations globally, and are reported as a common cause of mortality in Queensland green sea turtles. Both the flukes and their ova are pathogenic and can contribute to the stranding or death of their host. Of particular interest are ova-associated brain lesions, which have been associated with host neurological deficits. Accurate estimations of disease frequency and the relative effect of infection relating to different spirorchiid species are made difficult by challenges in morphological identification of adults of some genera, and a lack of species-level identifying features for ova...
April 2017: International Journal for Parasitology. Parasites and Wildlife
https://www.readbyqxmd.com/read/28306747/hypothermic-stunning-of-green-sea-turtles-in-a-western-gulf-of-mexico-foraging-habitat
#3
Donna J Shaver, Philippe E Tissot, Mary M Streich, Jennifer Shelby Walker, Cynthia Rubio, Anthony F Amos, Jeffrey A George, Michelle R Pasawicz
Texas waters provide one of the most important developmental and foraging habitats for juvenile green turtles (Chelonia mydas) in the western Gulf of Mexico, but hypothermic stunning is a significant threat and was the largest cause of green turtle strandings in Texas from 1980 through 2015; of the 8,107 green turtles found stranded, 4,529 (55.9%) were victims of hypothermic stunning. Additionally, during this time, 203 hypothermic stunned green turtles were found incidentally captured due to power plant water intake entrapment...
2017: PloS One
https://www.readbyqxmd.com/read/28296279/an-immunohistochemical-approach-to-identify-the-sex-of-young-marine-turtles
#4
Boris M Tezak, Kathleen Guthrie, Jeanette Wyneken
Marine turtles exhibit temperature-dependent sex determination (TSD). During critical periods of embryonic development, the nest's thermal environment directs whether an embryo will develop as a male or female. At warmer sand temperatures nests tend to produce female-biased sex ratios. The rapid increase of global temperature highlights the need for a clear assessment of its effects on sea turtle sex ratios. However, estimating hatchling sex ratios at rookeries remains imprecise due to the lack of sexual dimorphism in young marine turtles...
March 13, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28295579/estimating-freshwater-turtle-mortality-rates-and-population-declines-following-hook-ingestion
#5
David A Steen, Orin J Robinson
Freshwater turtle populations are susceptible to declines following small increases in the mortality of adults, making it essential to identify and understand potential threats. Recent research has used x-ray technology to reveal that freshwater turtles ingest fish hooks associated with recreational angling; this is concerning because hook ingestion is a known source of additive mortality for sea turtles. We used a Bayesian-modeling framework, observed rates of freshwater turtle hook ingestion, and information from sea turtles to estimate there is a 1...
March 15, 2017: Conservation Biology: the Journal of the Society for Conservation Biology
https://www.readbyqxmd.com/read/28267875/loggerhead-sea-turtle-embryos-caretta-caretta-regulate-expression-of-stress-response-and-developmental-genes-when-exposed-to-a-biologically-realistic-heat-stress
#6
Blair P Bentley, Brian J Haas, Jamie N Tedeschi, Oliver Berry
Oviparous reptile embryos are expected to breach their critical thermal maxima if temperatures reach those predicted under current climate change models due to the lack the maternal buffering processes and parental care. Heat shock proteins (HSPs) are integral in the molecular response to thermal stress, and their expression is heritable, but the roles of other candidate families such as the heat shock factors (HSFs) have not been determined in reptiles. Here we subject embryonic sea turtles (Caretta caretta) to a biologically realistic thermal stress and employ de novo transcriptomic profiling of brain tissue to investigate the underlying molecular response...
March 7, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28249020/the-use-of-mesoscale-eddies-by-juvenile-loggerhead-sea-turtles-caretta-caretta-in-the-southwestern-atlantic
#7
Peter Gaube, Caren Barceló, Dennis J McGillicuddy, Andrés Domingo, Philip Miller, Bruno Giffoni, Neca Marcovaldi, Yonat Swimmer
Marine animals, such as turtles, seabirds and pelagic fishes, are observed to travel and congregate around eddies in the open ocean. Mesoscale eddies, large swirling ocean vortices with radius scales of approximately 50-100 km, provide environmental variability that can structure these populations. In this study, we investigate the use of mesoscale eddies by 24 individual juvenile loggerhead sea turtles (Caretta caretta) in the Brazil-Malvinas Confluence region. The influence of eddies on turtles is assessed by collocating the turtle trajectories to the tracks of mesoscale eddies identified in maps of sea level anomaly...
2017: PloS One
https://www.readbyqxmd.com/read/28238183/associations-between-trace-elements-and-clinical-health-parameters-in-the-north-pacific-loggerhead-sea-turtle-caretta-caretta-from-baja-california-sur-mexico
#8
César Paúl Ley-Quiñónez, Natalia Alejandra Rossi-Lafferriere, Teresa Leticia Espinoza-Carreon, Catherine Edwina Hart, Sherwood Hoyt Peckham, Alfredo Alonso Aguirre, Alan Alfredo Zavala-Norzagaray
This study investigated selected trace elements toxicity in sea turtles Caretta caretta population from Baja California Sur (BCS), Mexico, by analyzing associations among Zn, Se, Cu, As, Cd, Ni, Mn, Pb, and Hg with various biochemical parameters (packed cell volume, leukocytes, and selected blood parameters), and whether their concentrations could have an impact on the health status of sea turtles. Blood samples from 22 loggerhead (C. caretta) sea turtles from BCS, Mexico, were collected for trace elements on biochemistry parameter analyses...
February 25, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28219019/inferring-physiological-energetics-of-loggerhead-turtle-caretta-caretta-from-existing-data-using-a-general-metabolic-theory
#9
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
#10
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)...
April 2017: Oecologia
https://www.readbyqxmd.com/read/28202810/how-numbers-of-nesting-sea-turtles-can-be-overestimated-by-nearly-a-factor-of-two
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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