scholarly journals Recent advances on the estimation of the thermal reaction norm for sex ratios

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8451 ◽  
Author(s):  
F. Alberto Abreu-Grobois ◽  
B. Alejandra Morales-Mérida ◽  
Catherine E. Hart ◽  
Jean-Michel Guillon ◽  
Matthew H. Godfrey ◽  
...  
Keyword(s):  
Incubation Temperature ◽  
Climate Change Impacts ◽  
Reaction Norm ◽  
Thermal Reaction ◽  
Marine Turtle ◽  
Lepidochelys Olivacea ◽  
Incubation Experiments ◽  
Asymmetrical Pattern ◽  
Widespread Phenomenon ◽  
The Relationship

Temperature-dependent sex determination, or TSD, is a widespread phenomenon in reptiles. The shape of the relationship between constant incubation temperature and sex ratio defines the TSD pattern. The TSD pattern is considered a life-history parameter important for conservation because the wider the range of temperatures producing both sexes, the more resilient the species is to climate change impacts. We review the different published equations and methodologies that have been used to model TSD patterns. We describe a new flexible model that allows for an asymmetrical pattern around the pivotal temperature, which is the constant temperature producing both sexes in equal proportions. We show that Metropolis-Hastings with Markov chain produced by a Monte Carlo process has many advantages compared to maximum likelihood and is preferred. Finally, we apply the models to results from incubation experiments using eggs from the marine turtle Lepidochelys olivacea originating in Northeast Indian, East Pacific, and West Atlantic Regional Management Units (RMUs) and find large differences in pivotal temperatures but not in transitional ranges of temperatures.

scholarly journals Diversity of Epibionts Associated with Lepidochelys olivacea (Eschscholtz 1829) Sea Turtles Nesting in the Mexican South Pacific

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1734
Author(s):  
Brenda Sarahí Ramos-Rivera ◽  
Himmer Castro-Mondragon ◽  
José Gabriel Kuk-Dzul ◽  
Pedro Flores-Rodríguez ◽  
Rafael Flores-Garza
Keyword(s):  
Data Analysis ◽  
Sea Turtles ◽  
South Pacific ◽  
First Record ◽  
Abundant Species ◽  
Interspecific Relationships ◽  
Lepidochelys Olivacea ◽  
Significant Difference ◽  
The Relationship ◽  
Head Neck

The present study contributes to the knowledge of epibionts recorded on sea turtles that nested on a beach in the South Pacific of Mexico. A total of 125 Lepidochelys olivacea turtles nested on Llano Real beach, Guerrero, Mexico, were examined. We collected 450 conspicuous organisms from 8 species from 43 turtles. The corresponding data analysis was carried out to obtain the relative abundance, the relationship between turtle sizes and the presence of organisms, the similarity of species between the sampling months, and the interspecific relationships between the epibionts and the turtles observed. Chelonibia testudinaria was the most abundant species, while Remora remora was the least abundant species. The turtles were divided into six body sections, with the greatest abundance of these organisms located in the head–neck section of turtles, and there was a significant difference in the size of the turtles that presented epibionts and those that did not. C. testudinaria showed greater similarity between sampling months, and the interspecific relationships recorded were commensalism, parasitism, amensalism, and protocooperation. This research contributes the first record of epibionts in L. olivacea nesting in Guerrero, Mexico.

The Effect of Climate Change on the Health of Aged People in Ibadan, Nigeria

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
O. J. Kehinde ◽  
A. T. Adeboyejo
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Maximum Temperature ◽  
Climatic Parameters ◽  
Data Set ◽  
Aged People ◽  
Improvement Programs ◽  
The Relationship ◽  
Component Scores ◽  
Ibadan Nigeria

Susceptibility to ill health among aged people had been linked with climate change impacts in rapidly urbanising cities. Therefore, this study evaluates to the vulnerability of aged people to the health impacts of climate change in Ibadan, Nigeria. Data on clinically diagnosed climate related diseases (CRDs) (2000 – 2014) among aged people (>50 years) and temperature and rainfall parameters (1970 – 2007) in Ibadan were obtained and projected to year 2050. Also, the relationship between the climatic parameters and incidence of the five most prevalent CRDs were analysed using multiple regression. The increasing trend of mean maximum temperature (r = 0.47) and rainfall (r = 0.15) is associated with incidences of hypertension (34.4%), respiratory diseases (21.2%) and diarrhoea (14.3%) among aged people (> 60 years), mostly male folk (67.2%). The linear composite of disease communalities extracted 84.0% variance of the data set with the following component scores: skin disease (0.98), hypertension (0.96), respiratory disease (0.92), diarrhoea (0.89) and malaria (0.45). Further, CRDs (R2 = 27%, p = 0.012) in Ibadan among aged people could be significantly attributed to influences of climatic parameters. The study suggests building aged peoples’ resilience to emanating impacts through health and nutritional improvement programs, and re-introduction of neighbourhood parks and gardens.

scholarly journals Hatchlings of the Marine Turtle Lepidochelys olivacea Display Signs of Prenatal Stress at Emergence after Being Incubated in Man-Made Nests: A Preliminary Report

2017 ◽  
Vol 4 ◽  
Author(s):  
Ma. A. Herrera-Vargas ◽  
Esperanza Meléndez-Herrera ◽  
Gabriel Gutiérrez-Ospina ◽  
Fany E. Bucio-Piña ◽  
Armida Báez-Saldaña ◽  
...  
Keyword(s):  
Prenatal Stress ◽  
Preliminary Report ◽  
Marine Turtle ◽  
Lepidochelys Olivacea

scholarly journals Targeting adaptation to safeguard sustainable development against climate-change impacts

2021 ◽  
Author(s):  
Lena Fuldauer ◽  
Scott Thacker ◽  
Robyn Haggis ◽  
Francesco Fuso Nerini ◽  
Robert Nicholls ◽  
...  
Keyword(s):  
Climate Change ◽  
Sustainable Development ◽  
Sustainable Development Goals ◽  
Climate Change Impacts ◽  
Economic Sectors ◽  
Global Priority ◽  
Climate Action ◽  
Development Goals ◽  
Systems Framework ◽  
The Relationship

Abstract The international community has committed to achieve 17 Sustainable Development Goals (SDGs) by 2030 and to enhance climate action under the Paris Agreement. Yet achievement of the SDGs is already threatened by climate-change impacts. Here we show that further adaptation this decade is urgently required to safeguard 68% of SDG targets against acute and chronic threats from climate change. We analyse how the relationship between SDG targets and climate-change impacts is mediated by ecosystems and socio-economic sectors, which provides a framework for targeting adaptation. Adaptation of wetlands, rivers, cropland, construction, water, electricity and housing in the most vulnerable countries should be a global priority to safeguard sustainable development by 2030. We have applied our systems framework at the national scale in Saint Lucia and Ghana, which is helping to align National Adaptation Plans with the SDGs, thus ensuring that adaptation is contributing to, rather than detracting from, sustainable development.

scholarly journals Do Differences in Latitudinal Distributions of Species and Organelle Haplotypes Reflect Thermal Reaction Norms Within the Emiliania/Gephyrocapsa Complex?

2021 ◽  
Vol 8 ◽  
Author(s):  
Peter von Dassow ◽  
Paula Valentina Muñoz Farías ◽  
Sarah Pinon ◽  
Esther Velasco-Senovilla ◽  
Simon Anguita-Salinas
Keyword(s):  
Local Adaptation ◽  
Coastal Upwelling ◽  
Environmental Gradients ◽  
Reaction Norm ◽  
Emiliania Huxleyi ◽  
Thermal Reaction ◽  
Reaction Norms ◽  
Thermal Niche ◽  
Significant Difference ◽  
The Difference

The cosmopolitan phytoplankter Emiliania huxleyi contrasts with its closest relatives that are restricted to narrower latitudinal bands, making it interesting for exploring how alternative outcomes in phytoplankton range distributions arise. Mitochondrial and chloroplast haplogroups within E. huxleyi are shared with their closest relatives: Some E. huxleyi share organelle haplogroups with Gephyrocapsa parvula and G. ericsonii which inhabit lower latitudes, while other E. huxleyi share organelle haplogroups with G. muellerae, which inhabit high latitudes. We investigated whether the phylogeny of E. huxleyi organelles reflects environmental gradients, focusing on the Southeast Pacific where the different haplogroups and species co-occur. There was a high congruence between mitochondrial and chloroplast haplogroups within E. huxleyi. Haplogroup II of E. huxleyi is negatively associated with cooler less saline waters, compared to haplogroup I, both when analyzed globally and across temporal variability at the small special scale of a center of coastal upwelling at 30° S. A new mitochondrial haplogroup Ib detected in coastal Chile was associated with warmer waters. In an experiment focused on inter-species comparisons, laboratory-determined thermal reaction norms were consistent with latitudinal/thermal distributions of species, with G. oceanica exhibiting warm thermal optima and tolerance and G. muellerae exhibiting cooler thermal optima and tolerances. Emiliania huxleyi haplogroups I and II tended to exhibit a wider thermal niche compared to the other Gephyrocapsa, but no differences among haplogroups within E. huxleyi were found. A second experiment, controlling for local adaptation and time in culture, found a significant difference between E. huxleyi haplogroups. The difference between I and II was of the expected sign, but not the difference between I and Ib. The differences were small (≤1°C) compared to differences reported previously within E. huxleyi by local adaptation and even in-culture evolution. Haplogroup Ib showed a narrower thermal niche. The cosmopolitanism of E. huxleyi might result from both wide-spread generalist phenotypes and specialist phenotypes, as well as a capacity for local adaptation. Thermal reaction norm differences can well explain the species distributions but poorly explain distributions among mitochondrial haplogroups within E. huxleyi. Perhaps organelle haplogroup distributions reflect historical rather than selective processes.

scholarly journals Divergence and ontogenetic coupling of larval behaviour and thermal reaction norms in three closely related butterflies

2010 ◽  
Vol 278 (1703) ◽  
pp. 313-320 ◽  
Author(s):  
David Berger ◽  
Magne Friberg ◽  
Karl Gotthard
Keyword(s):  
Developmental Plasticity ◽  
Larval Growth ◽  
State Dependence ◽  
Reaction Norm ◽  
Thermal Reaction ◽  
Reaction Norms ◽  
Feeding Strategies ◽  
Species Differentiation ◽  
Larval Behaviour ◽  
Trade Offs

Genetic trade-offs such as between generalist–specialist strategies can be masked by changes in compensatory processes involving energy allocation and acquisition which regulation depends on the state of the individual and its ecological surroundings. Failure to account for such state dependence may thus lead to misconceptions about the trade-off structure and nature of constraints governing reaction norm evolution. Using three closely related butterflies, we first show that foraging behaviours differ between species and change remarkably throughout ontogeny causing corresponding differences in the thermal niches experienced by the foraging larvae. We further predicted that thermal reaction norms for larval growth rate would show state-dependent variation throughout development as a result of selection for optimizing feeding strategies in the respective foraging niches of young and old larvae. We found substantial developmental plasticity in reaction norms that was species-specific and reflected the different ontogenetic niche shifts. Any conclusions regarding constraints on performance curves or species-differentiation in thermal physiology depend on when reaction norms were measured. This demonstrates that standardized estimates at single points in development, or in general, allow variation in only one ecological dimension, may sometimes provide incomplete information on reaction norm constraints.

scholarly journals Swift thermal reaction norm evolution in a key marine phytoplankton species

2016 ◽  
Vol 9 (9) ◽  
pp. 1156-1164 ◽  
Author(s):  
Luisa Listmann ◽  
Maxime LeRoch ◽  
Lothar Schlüter ◽  
Mridul K. Thomas ◽  
Thorsten B. H. Reusch
Keyword(s):  
Reaction Norm ◽  
Thermal Reaction ◽  
Marine Phytoplankton ◽  
Phytoplankton Species ◽  
Norm Evolution

Embryonic Growth Rate Thermal Reaction Norm of Mediterranean Caretta caretta Embryos from Two Different Thermal Habitats, Turkey and Libya

2017 ◽  
Vol 16 (2) ◽  
pp. 172-179 ◽  
Author(s):  
Jonathan Monsinjon ◽  
Imed Jribi ◽  
Abdulmaula Hamza ◽  
Atef Ouerghi ◽  
Yakup Kaska ◽  
...  
Keyword(s):  
Growth Rate ◽  
Caretta Caretta ◽  
Reaction Norm ◽  
Thermal Reaction ◽  
Embryonic Growth

scholarly journals Sensation Seeking and Gambling Behavior in Adolescence: Can Externalizing Problems Moderate this Relationship?

2020 ◽  
Vol 17 (23) ◽  
pp. 8986
Author(s):  
Franca Tani ◽  
Lucia Ponti ◽  
Simon Ghinassi
Keyword(s):  
Externalizing Problems ◽  
Sensation Seeking ◽  
Gambling Behavior ◽  
Adolescent Gambling ◽  
Gambling Behaviors ◽  
Widespread Phenomenon ◽  
Gambling Severity ◽  
The Relationship ◽  
Moderating Role

Gambling is a widespread phenomenon during adolescence. Among different risk factors involved in the onset of adolescent gambling behaviors, one factor that is studied is the sensation seeking personality trait. However, the literature is heterogeneous and a direct relationship between sensation seeking and gaming behaviors has not always been highlighted. This suggests that the relationship can be influenced by other factors. In particular, we explored the moderating role of externalizing problems in this relationship. A total of 363 adolescents (232 males and 131 females) aged 14 to 20 (M = 16.35, SD = 1.36) completed a battery of questionnaires aimed to assess their gambling behaviors, as well as the levels of externalizing problems and sensation seeking. The results showed that sensation seeking was associated with gambling severity, but this relationship was significant when externalizing problems were high and medium. On the contrary, when externalizing problems were low, the relationship between sensation seeking and gambling severity was not significant. Overall, sensation seeking in adolescence can favor the implementation of risk behaviors, such as gambling, but only in association with the presence of externalizing problems. Limitations, strengths, and social and clinical implications of the present study are discussed.

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