scholarly journals Incorporating Geographical Scale and Multiple Environmental Factors to Delineate the Breeding Distribution of Sea Turtles

Drones ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 142
Author(s):  
Liam C. Dickson ◽  
Kostas A. Katselidis ◽  
Christophe Eizaguirre ◽  
Gail Schofield
Keyword(s):  
Sea Turtles ◽  
Regional Distribution ◽  
Environmental Parameters ◽  
Environmental Data ◽  
Offshore Wind ◽  
Loggerhead Sea Turtles ◽  
Change Models ◽  
Terrestrial Environments ◽  
Aircraft System ◽  
Marine Megafauna

Temperature is often used to infer how climate influences wildlife distributions; yet, other parameters also contribute, separately and combined, with effects varying across geographical scales. Here, we used an unoccupied aircraft system to explore how environmental parameters affect the regional distribution of the terrestrial and marine breeding habitats of threatened loggerhead sea turtles (Caretta caretta). Surveys spanned four years and ~620 km coastline of western Greece, encompassing low (<10 nests/km) to high (100–500 nests/km) density nesting areas. We recorded 2395 tracks left by turtles on beaches and 1928 turtles occupying waters adjacent to these beaches. Variation in beach track and inwater turtle densities was explained by temperature, offshore prevailing wind, and physical marine and terrestrial factors combined. The highest beach-track densities (400 tracks/km) occurred on beaches with steep slopes and higher sand temperatures, sheltered from prevailing offshore winds. The highest inwater turtle densities (270 turtles/km) occurred over submerged sandbanks, with warmer sea temperatures associated with offshore wind. Most turtles (90%) occurred over nearshore submerged sandbanks within 10 km of beaches supporting the highest track densities, showing the strong linkage between optimal marine and terrestrial environments for breeding. Our findings demonstrate the utility of UASs in surveying marine megafauna and environmental data at large scales and the importance of integrating multiple factors in climate change models to predict species distributions.

scholarly journals Multiple-threats analysis for loggerhead sea turtles in the southwest Atlantic Ocean

2020 ◽  
Vol 41 ◽  
pp. 183-196 ◽  
Author(s):  
M López-Mendilaharsu ◽  
B Giffoni ◽  
D Monteiro ◽  
L Prosdocimi ◽  
GM Vélez-Rubio ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Life Stages ◽  
Loggerhead Sea Turtles ◽  
Southwest Atlantic ◽  
Trawl Fishery ◽  
Threat Analysis ◽  
Species Of Conservation Concern ◽  
Terrestrial Environments ◽  
Fisheries Bycatch ◽  
Conservation Concern

Priority-setting approaches for widely distributed and long-lived species can be challenging. This is especially true for sea turtles, which are species of conservation concern. The aim of this study was to conduct a detailed analysis of threats to identify, quantify and prioritize the main impacts to the loggerhead Caretta caretta population in the southwest Atlantic (SWA) region. A matrix of relative threats was constructed. Threats were identified and classified for 8 different life stages (nesting females, eggs, hatchlings, swim-frenzy transitional stage, juveniles-neritic, juveniles-oceanic, adults-neritic, adults-oceanic) and for 3 ecosystems inhabited by sea turtles (terrestrial, neritic and oceanic). Results indicated that fisheries bycatch represents a major threat for loggerheads in the SWA. The trawl fishery was identified as the main source of mortality for neritic juvenile and adult turtles, whereas juveniles in oceanic areas are mostly impacted by surface longlines. In terrestrial environments, eggs and hatchlings are mainly affected by habitat alteration and by native and exotic predators. Loggerheads have shown a positive nesting trend at their main nesting beaches in the SWA, probably due to long-term conservation efforts to reduce mortality of the different life stages within the terrestrial zone. However, the high mortality rates of juveniles and sub-adults documented at some known foraging grounds represent a reason for concern, as this may affect the overall population trend in the future. This threat analysis provides a tool to review the goals of national action plans, prioritize actions and optimize the allocation of management resources.

scholarly journals Phenological response of sea turtles to environmental variation across a species' northern range

2013 ◽  
Vol 280 (1751) ◽  
pp. 20122397 ◽  
Author(s):  
Antonios D. Mazaris ◽  
Athanasios S. Kallimanis ◽  
John D. Pantis ◽  
Graeme C. Hays
Keyword(s):  
Climate Change ◽  
Global Climate ◽  
Sea Turtles ◽  
Environmental Parameters ◽  
Species Range ◽  
Range Limit ◽  
Loggerhead Sea Turtles ◽  
Breeding Sites ◽  
Phenological Shifts ◽  
The Relationship

Variations in environmental parameters (e.g. temperature) that form part of global climate change have been associated with shifts in the timing of seasonal events for a broad range of organisms. Most studies evaluating such phenological shifts of individual taxa have focused on a limited number of locations, making it difficult to assess how such shifts vary regionally across a species range. Here, by using 1445 records of the date of first nesting for loggerhead sea turtles ( Caretta caretta ) at different breeding sites, on different continents and in different years across a broad latitudinal range (25–39° ′N), we demonstrate that the gradient of the relationship between temperature and the date of first breeding is steeper at higher latitudes, i.e. the phenological responses to temperature appear strongest at the poleward range limit. These findings support the hypothesis that biological changes in response to climate change will be most acute at the poleward range limits and are in accordance with the predictions of MacArthur's hypothesis that poleward range limit for species range is environmentally limited. Our findings imply that the poleward populations of loggerheads are more sensitive to climate variations and thus they might display the impacts of climate change sooner and more prominently.

scholarly journals The impact of environmental variables on the spread of COVID-19 in the Republic of Korea

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yong Kwan Lim ◽  
Oh Joo Kweon ◽  
Hye Ryoun Kim ◽  
Tae-Hyoung Kim ◽  
Mi-Kyung Lee
Keyword(s):  
Environmental Factors ◽  
Virus Disease ◽  
Environmental Parameters ◽  
Environmental Data ◽  
Republic Of Korea ◽  
Metropolitan Region ◽  
Health Concern ◽  
Ozone Level ◽  
The Republic ◽  
The Impact

AbstractCorona virus disease 2019 (COVID-19) has been declared a global pandemic and is a major public health concern worldwide. In this study, we aimed to determine the role of environmental factors, such as climate and air pollutants, in the transmission of COVID-19 in the Republic of Korea. We collected epidemiological and environmental data from two regions of the Republic of Korea, namely Seoul metropolitan region (SMR) and Daegu-Gyeongbuk region (DGR) from February 2020 to July 2020. The data was then analyzed to identify correlations between each environmental factor with confirmed daily COVID-19 cases. Among the various environmental parameters, the duration of sunshine and ozone level were found to positively correlate with COVID-19 cases in both regions. However, the association of temperature variables with COVID-19 transmission revealed contradictory results when comparing the data from SMR and DGR. Moreover, statistical bias may have arisen due to an extensive epidemiological investigation and altered socio-behaviors that occurred in response to a COVID-19 outbreak. Nevertheless, our results suggest that various environmental factors may play a role in COVID-19 transmission.

Pharmacokinetics of Marbofloxacin in Loggerhead Sea Turtles (Caretta caretta) after Single Intravenous and Intramuscular Doses

2009 ◽  
Vol 40 (3) ◽  
pp. 501-507 ◽  
Author(s):  
Olimpia R. Lai ◽  
Pedro Marín ◽  
Pietro Laricchiuta ◽  
Giacomo Marzano ◽  
Giuseppe Crescenzo ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Caretta Caretta ◽  
Loggerhead Sea Turtles

scholarly journals Letter to the editor: Theileria in loggerhead sea turtles Caretta caretta

2015 ◽  
Vol 24 (4) ◽  
pp. 709-710
Author(s):  
Nicole I. Stacy ◽  
Ellis C. Greiner ◽  
Elliott R. Jacobson ◽  
John W. Harvey
Keyword(s):  
Sea Turtles ◽  
Caretta Caretta ◽  
Loggerhead Sea Turtles ◽  
Letter To The Editor

Corrigendum to “Social monogamy in the crab Planes major, a facultative symbiont of loggerhead sea turtles”[J. Exp. Mar. Biol. Ecol. 461 (2014) 124–132]

2015 ◽  
Vol 467 ◽  
pp. 121
Author(s):  
Joseph B. Pfaller ◽  
Joanna Alfaro-Shigueto ◽  
Bruno Giffoni ◽  
Takashi Ishihara ◽  
Jeffrey C. Mangel ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Social Monogamy ◽  
Loggerhead Sea Turtles
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