1
|
Mobaraki A, Phillott AD, Erfani M, Ghasemi M, Jafari H. Inferred Impacts of Extreme Environments on Hawksbill Turtle (Eretmochelys imbricata) Body Size and Reproductive Output. CHELONIAN CONSERVATION AND BIOLOGY 2022. [DOI: 10.2744/ccb-1546.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Asghar Mobaraki
- Wildlife Conservation and Management Bureau, Department of Environment, Pardisan Eco-Park, Hemmat Highway, Tehran, Iran []
| | - Andrea D. Phillott
- FLAME University, Gat No. 1270, Lavale, Off Pune Bangalore Highway, Pune 412115, Maharashtra, India []
| | - Malihe Erfani
- Department of Environmental Sciences, Faculty of Natural Resources, University of Zabol, Zabol, Iran []
| | - Meysam Ghasemi
- Department of Environment Office of Hormozgan Province Golshahr Street, Hormozgan, Bandar Abbas, Iran []
| | - Hossein Jafari
- Department of Environment Office in Bushehr Province, Ashoori Street, Bushehr, Iran [
]
| |
Collapse
|
2
|
Mata F, Mata P. Nesting preferences of the green sea turtle (Chelonia mydas L.) and the hawksbill sea turtle (Eretmochelys imbricata L.) in the SW of Mahe Island in the Seychelles. ANIMAL BIODIVERSITY AND CONSERVATION 2021. [DOI: 10.32800/abc.2022.45.0023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Data concerning 212 turtles emerging on the southwest beaches of Mahe Island in the Seychelles were collected in 2017 and 2018. These data were used to model the probability of eggs being laid in relation to several variables. The probability of successful laying after emergence was highest on certain beaches and in areas of short vegetation, between open sand and trees. We found successful laying was related to the physical properties of the soil, indicating that survivability of embryos and hatchlings is higher in certain areas. The turtles appeared to choose zones where soil had low salinity, good drainage but ability to retain water, and absence of spring tides and extreme temperatures.
Collapse
Affiliation(s)
- F. Mata
- CISAS–Centre for Research and Development in Agri–food Systems and Sustainability, Instituto Politécnico de Viana do Castelo, Portugal
| | - P. Mata
- Ruskin Mill College, Millbottom, Gloucestershire, UK
| |
Collapse
|
3
|
Bomfim ADC, Farias DSDD, Silva FJDL, Rossi S, Gavilan SA, Santana VGDS, Pontes CS. Long-term monitoring of marine turtle nests in northeastern Brazil. BIOTA NEOTROPICA 2021. [DOI: 10.1590/1676-0611-bn-2020-1159] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract: This study monitored marine turtle nests in a region known as the Potiguar Basin, which stretches from the northern region of Rio Grande do Norte State (5°4’1.15” S, 36°4’36.41” W) to eastern Ceará State (4°38’48.28” S, 37°32’52.08” W) in Brazil. We collected data from January 2011 to December 2019 to identify species of sea turtles that spawn in the basin, to analyze the nesting spatial-temporal pattern and nests characteristics, and to record effects of environmental and anthropic factors on nests. A field team examined sea turtle tracks and nests signs. Turtle clutches were monitored daily until hatchings emerged from the nests. We monitored nests of hawksbill (Eretmochelys imbricata; n = 238) and olive Ridley turtles (Lepidochelys olivacea; n = 103). The nesting season for E. imbricata occurred between December and May and for L. olivacea from March to August. Hawksbills had clutch size, incubation time, number of unhatched eggs, and dead hatchlings higher than olive Ridley turtles; nevertheless, they presented lower hatching success. Precipitation between 0 and 22 mm and relative humidity (RH) higher than 69% increased the hatching success rate for E. imbricata; however, rainfall above 11 mm and RH 64% had the same effect for L. olivacea. Signs of egg theft and human presence (e.g. vehicle traffic and plastic residues on the beach) were recorded and are considered threats to nests. The results of our long-term monitoring study in the Potiguar Basin provide basis for the implementation of mitigation measures and adoption of management policies at nesting beaches in this Brazilian region.
Collapse
Affiliation(s)
- Aline da Costa Bomfim
- Universidade Federal do Rio Grande do Norte, Brasil; Universidade Federal do Rio Grande do Norte, Brasil; Universidade do Estado do Rio Grande do Norte, Brasil; Centro de Estudos e Monitoramento Ambiental, Brasil
| | - Daniel Solon Dias de Farias
- Universidade Federal do Rio Grande do Norte, Brasil; Universidade Federal do Rio Grande do Norte, Brasil; Universidade do Estado do Rio Grande do Norte, Brasil; Centro de Estudos e Monitoramento Ambiental, Brasil
| | - Flávio José de Lima Silva
- Universidade do Estado do Rio Grande do Norte, Brasil; Centro de Estudos e Monitoramento Ambiental, Brasil; Universidade do Estado do Rio Grande do Norte, Brasil
| | | | - Simone Almeida Gavilan
- Universidade Federal do Rio Grande do Norte, Brasil; Universidade do Estado do Rio Grande do Norte, Brasil; Centro de Estudos e Monitoramento Ambiental, Brasil
| | | | - Cibele Soares Pontes
- Universidade Federal do Rio Grande do Norte, Brasil; Universidade Federal do Rio Grande do Norte, Brasil
| |
Collapse
|
4
|
Janzen FJ, Delaney DM, Mitchell TS, Warner DA. Do Covariances Between Maternal Behavior and Embryonic Physiology Drive Sex-Ratio Evolution Under Environmental Sex Determination? J Hered 2019; 110:411-421. [PMID: 30982894 DOI: 10.1093/jhered/esz021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 04/11/2019] [Indexed: 11/12/2022] Open
Abstract
Fisherian sex-ratio theory predicts sexual species should have a balanced primary sex ratio. However, organisms with environmental sex determination (ESD) are particularly vulnerable to experiencing skewed sex ratios when environmental conditions vary. Theoretical work has modeled sex-ratio dynamics for animals with ESD with regard to 2 traits predicted to be responsive to sex-ratio selection: 1) maternal oviposition behavior and 2) sensitivity of embryonic sex determination to environmental conditions, and much research has since focused on how these traits influence offspring sex ratios. However, relatively few studies have provided estimates of univariate quantitative genetic parameters for these 2 traits, and the existence of phenotypic or genetic covariances among these traits has not been assessed. Here, we leverage studies on 3 species of reptiles (2 turtle species and a lizard) with temperature-dependent sex determination (TSD) to assess phenotypic covariances between measures of maternal oviposition behavior and thermal sensitivity of the sex-determining pathway. These studies quantified maternal behaviors that relate to nest temperature and sex ratio of offspring incubated under controlled conditions. A positive covariance between these traits would enhance the efficiency of sex-ratio selection when primary sex ratio is unbalanced. However, we detected no such covariance between measures of these categories of traits in the 3 study species. These results suggest that maternal oviposition behavior and thermal sensitivity of sex determination in embryos might evolve independently. Such information is critical to understand how animals with TSD will respond to rapidly changing environments that induce sex-ratio selection.
Collapse
Affiliation(s)
- Fredric J Janzen
- Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA
| | - David M Delaney
- Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA
| | - Timothy S Mitchell
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN
| | - Daniel A Warner
- Department of Biological Sciences, Auburn University, Auburn, AL
| |
Collapse
|
5
|
|
6
|
Montero N, dei Marcovaldi MAG, Lopez–Mendilaharsu M, Santos AS, Santos AJB, Fuentes MMPB. Warmer and wetter conditions will reduce offspring production of hawksbill turtles in Brazil under climate change. PLoS One 2018; 13:e0204188. [PMID: 30408043 PMCID: PMC6224045 DOI: 10.1371/journal.pone.0204188] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Accepted: 10/18/2018] [Indexed: 01/27/2023] Open
Abstract
Climate change is expected to impact animals that are heavily reliant on environmental factors, such as sea turtles, since the incubation of their eggs, hatching success and sex ratio are influenced by the environment in which eggs incubate. As climate change progresses it is therefore important to understand how climatic conditions influence their reproductive output and the ramifications to population stability. Here, we examined the influences of five climatic variables (air temperature, accumulated and average precipitation, humidity, solar radiation, and wind speed) at different temporal scales on hawksbill sea turtle (Eretmochelys imbricata) hatchling production at ten nesting beaches within two regions of Brazil (five nesting beaches in Rio Grande do Norte and five in Bahia). Air temperature and accumulated precipitation were the main climatic drivers of hawksbill hatching success (number of eggs hatched within a nest) across Brazil and in Rio Grande do Norte, while air temperature and average precipitation were the main climatic drivers of hatching success at Bahia. Solar radiation was the main climatic driver of emergence success (number of hatchlings that emerged from total hatched eggs within a nest) at both regions. Warmer temperatures and higher solar radiation had negative effects on hatchling production, while wetter conditions had a positive effect. Conservative and extreme climate scenarios show air temperatures are projected to increase at this site, while precipitation projections vary between scenarios and regions throughout the 21st century. We predicted hatching success of undisturbed nests (no recorded depredation or storm-related impacts) will decrease in Brazil by 2100 as a result of how this population is influenced by local climate. This study shows the determining effects of different climate variables and their combinations on an important and critically endangered marine species.
Collapse
Affiliation(s)
- Natalie Montero
- Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida, United States of America
| | | | | | | | | | - Mariana M. P. B. Fuentes
- Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, Florida, United States of America
| |
Collapse
|
7
|
Nesting ecology of hawksbill turtles, Eretmochelys imbricata, in an extreme environmental setting. PLoS One 2018; 13:e0203257. [PMID: 30192801 PMCID: PMC6128527 DOI: 10.1371/journal.pone.0203257] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 08/17/2018] [Indexed: 11/19/2022] Open
Abstract
Relatively few details of hawksbill turtle (Eretmochelys imbricata) nesting ecology exist within the Arabian Gulf. Moreover, little is known about how their nesting dynamics compare to nesting populations throughout the rest of the world. Due to the extreme environmental setting, nesting ecology of hawksbills in the Arabian Gulf is of significant interest to researchers and conservationists. The current research reports on a long-term tagging and monitoring program undertaken at Fuwairit beach, Qatar. To investigate nesting behavior, site surveys and tagging were employed from 2010 to 2016. Presence of nests and clutch sizes were confirmed by excavation. Over the entire study period, nesting hawksbills had a mean curved carapace length of 70.8 cm (SD±2.8). A total 187 nests were confirmed, which contained a mean 78.9 eggs per clutch (SD±17.1), over an annual nesting season that lasted an average of 52.2 days (SD±6.3) from the start of April to the start of June. Meta-analysis with other global regions showed these characteristics to be significantly reduced when compared to nesting hawksbills from other populations. Meteorological data analysis showed air temperatures in the Arabian Gulf to increase on average 13.2°C (SD±0.26) from start to the end of nesting annually, which is significantly greater than other global nesting regions. Their smaller body size and reduced fecundity coupled with the extreme change in ambient air temperatures support the hypothesis that hawksbills in the region are more at risk than the already critically endangered hawksbill populations elsewhere in the world.
Collapse
|
8
|
Hernández-Cortés JA, Núñez-Lara E, Cuevas E, Guzmán-Hernández V. Natural Beach Vegetation Coverage and Type Influence the Nesting Habitat of Hawksbill Turtles (Eretmochelys imbricata) in Campeche, Mexico. CHELONIAN CONSERVATION AND BIOLOGY 2018. [DOI: 10.2744/ccb-1280.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Juan Alberto Hernández-Cortés
- Centro de Investigación de Ciencias Ambientales, Universidad Autónoma del Carmen, Calle 56 No. 4, Esq. Avenida Concordia, Col. Benito Juárez, 24180 Ciudad del Carmen, Campeche, México []
| | - Enrique Núñez-Lara
- Universidad Autónoma del Carmen, Facultad de Ciencias Naturales y Exactas, Ciudad del Carmen, Campeche, México []
| | - Eduardo Cuevas
- Pronatura Península de Yucatán, A.C., Calle 32 x 47 y 47A No. 269, Col. Pinzón II, 97205, Mérida, Yucatan, México
| | - Vicente Guzmán-Hernández
- Área de Protección de Flora y Fauna Laguna de Términos, Comisión Nacional de Áreas Naturales Protegidas, Av. Adolfo López Mateos, Prolongación Playa Norte, C.P. 24140, Ciudad del Carmen, Campeche, México []
| |
Collapse
|
9
|
|
10
|
Rees AF, Alfaro-Shigueto J, Barata PCR, Bjorndal KA, Bolten AB, Bourjea J, Broderick AC, Campbell LM, Cardona L, Carreras C, Casale P, Ceriani SA, Dutton PH, Eguchi T, Formia A, Fuentes MMPB, Fuller WJ, Girondot M, Godfrey MH, Hamann M, Hart KM, Hays GC, Hochscheid S, Kaska Y, Jensen MP, Mangel JC, Mortimer JA, Naro-Maciel E, Ng CKY, Nichols WJ, Phillott AD, Reina RD, Revuelta O, Schofield G, Seminoff JA, Shanker K, Tomás J, van de Merwe JP, Van Houtan KS, Vander Zanden HB, Wallace BP, Wedemeyer-Strombel KR, Work TM, Godley BJ. Are we working towards global research priorities for management and conservation of sea turtles? ENDANGER SPECIES RES 2016. [DOI: 10.3354/esr00801] [Citation(s) in RCA: 175] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|