Size‐based differences in isotopic niche width (δ 13 C and δ 15 N) of green turtles ( Chelonia mydas ) nesting on Príncipe Island, Gulf of Guinea

2021 ◽  
Vol 42 (1) ◽  
Author(s):  
Rogério L. Ferreira ◽  
Filipe R. Ceia ◽  
Teresa C. Borges ◽  
Jaime A. Ramos ◽  
Alan B. Bolten
Keyword(s):  
Chelonia Mydas ◽  
Niche Width ◽  
Isotopic Niche ◽  
Gulf Of Guinea ◽  
Green Turtles ◽  
Isotopic Niche Width

The effects of spatial scale and isoscape on consumer isotopic niche width

2018 ◽  
Vol 32 (4) ◽  
pp. 904-915 ◽  
Author(s):  
Carl J. Reddin ◽  
John H. Bothwell ◽  
Nessa E. O'Connor ◽  
Chris Harrod
Keyword(s):  
Spatial Scale ◽  
Niche Width ◽  
Isotopic Niche ◽  
Isotopic Niche Width

Genetic characterization of green turtles (Chelonia mydas) from São Tomé and Príncipe: Insights on species recruitment and dispersal in the Gulf of Guinea

2019 ◽  
Vol 518 ◽  
pp. 151181
Author(s):  
Joana M. Hancock ◽  
Sara Vieira ◽  
Lúcio Taraveira ◽  
Aladino Santos ◽  
Vanessa Schmitt ◽  
...  
Keyword(s):  
Genetic Characterization ◽  
Chelonia Mydas ◽  
Gulf Of Guinea ◽  
Green Turtles ◽  
Sao Tome And Principe ◽  
Species Recruitment

scholarly journals Resource use and the impacts of fisheries on two sympatric sea snake species on the West Coast of India.

2021 ◽  
Author(s):  
Shawn Dsouza ◽  
Chetan Rao ◽  
Muralidharan Manoharakrishnan ◽  
Kartik Shanker
Keyword(s):  
Food Webs ◽  
Resource Use ◽  
West Coast ◽  
Niche Width ◽  
Isotopic Niche ◽  
The West ◽  
Sea Snake ◽  
Snake Species ◽  
West Coast Of India ◽  
Isotopic Niche Width

Abstract Species interactions are central to community assembly and ecosystem functioning. Sea snakes play an important role as mesopredators and as intermediate links in coastal marine food webs. However, they are impacted by anthropogenic pressures such as fisheries throughout their range. We investigated differences in resource use between two sympatric sea snake species from the west coast of India, Hydrophis curtus and H. schistosus, and described the impacts of fishing on the interactions of these species. We compared habitat use, diet, and isotopic niche width between species to determine resource overlap. We then compared trophic overlap of each species with the fisheries in the region and tested the effect of fishing intensity on their isotopic niche width. We found that H. curtus used deeper habitats than H. schistosus, resulting in increased spatial overlap with fisheries. The two species also had distinct trophic niches and H. curtus prey formed a larger proportion of fishery catch on average than H. schistosus. This greater overlap could make H. curtus more vulnerable to the effects of fisheries. Both species exhibited expansion in short-term and long-term isotopic niche width along a gradient of fishing intensity which may indicate behavioural changes associated with the presence of fisheries. Hydrophis curtus is a trophic generalist, competes with syntopic species and is dominant in most assemblages. However, H. schistosus exhibits higher plasticity in resource use and may have an advantage over H. curtus. Thus, fishing could alter the relative abundance of these mesopredators with cascading effects through coastal food webs.

Can variations in the spatial distribution at sea and isotopic niche width be associated with consistency in the isotopic niche of a pelagic seabird species?

2014 ◽  
Vol 161 (8) ◽  
pp. 1861-1872 ◽  
Author(s):  
Filipe R. Ceia ◽  
Vitor H. Paiva ◽  
Stefan Garthe ◽  
João C. Marques ◽  
Jaime A. Ramos
Keyword(s):  
Spatial Distribution ◽  
Niche Width ◽  
Isotopic Niche ◽  
Seabird Species ◽  
Pelagic Seabird ◽  
Isotopic Niche Width

Isotopic niche width differentiation between common bottlenose dolphin ecotypes and sperm whales in the Gulf of California

2017 ◽  
Vol 34 (2) ◽  
pp. 440-457 ◽  
Author(s):  
Raúl E. Díaz-Gamboa ◽  
Diane Gendron ◽  
Geraldine Busquets-Vass
Keyword(s):  
Bottlenose Dolphin ◽  
Gulf Of California ◽  
Niche Width ◽  
Isotopic Niche ◽  
Sperm Whales ◽  
Common Bottlenose Dolphin ◽  
Isotopic Niche Width

Stock composition of green turtles Chelonia mydas foraging in the Ryukyu Archipelago differs with size class

2018 ◽  
Vol 600 ◽  
pp. 151-163 ◽  
Author(s):  
T Hamabata ◽  
H Nishizawa ◽  
I Kawazu ◽  
K Kameda ◽  
N Kamezaki ◽  
...  
Keyword(s):  
Chelonia Mydas ◽  
Size Class ◽  
Ryukyu Archipelago ◽  
Green Turtles

scholarly journals Plasma proteomics of green turtles (Chelonia mydas) reveals pathway shifts and potential biomarker candidates associated with health and disease

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
David P Marancik ◽  
Justin R Perrault ◽  
Lisa M Komoroske ◽  
Jamie A Stoll ◽  
Kristina N Kelley ◽  
...  
Keyword(s):  
Chelonia Mydas ◽  
Sea Turtle ◽  
Protein Abundance ◽  
Plasma Samples ◽  
Important Species ◽  
Green Turtles ◽  
Rehabilitation Programs ◽  
Potential Biomarker ◽  
Health And Disease

Abstract Evaluating sea turtle health can be challenging due to an incomplete understanding of pathophysiologic responses in these species. Proteome characterization of clinical plasma samples can provide insights into disease progression and prospective biomarker targets. A TMT-10-plex-LC–MS/MS platform was used to characterize the plasma proteome of five, juvenile, green turtles (Chelonia mydas) and compare qualitative and quantitative protein changes during moribund and recovered states. The 10 plasma samples yielded a total of 670 unique proteins. Using ≥1.2-fold change in protein abundance as a benchmark for physiologic upregulation or downregulation, 233 (34.8%) were differentially regulated in at least one turtle between moribund and recovered states. Forty-six proteins (6.9%) were differentially regulated in all five turtles with two proteins (0.3%) demonstrating a statistically significant change. A principle component analysis showed protein abundance loosely clustered between moribund samples or recovered samples and for turtles that presented with trauma (n = 3) or as intestinal floaters (n = 2). Gene Ontology terms demonstrated that moribund samples were represented by a higher number of proteins associated with blood coagulation, adaptive immune responses and acute phase response, while recovered turtle samples included a relatively higher number of proteins associated with metabolic processes and response to nutrients. Abundance levels of 48 proteins (7.2%) in moribund samples significantly correlated with total protein, albumin and/or globulin levels quantified by biochemical analysis. Differentially regulated proteins identified with immunologic and physiologic functions are discussed for their possible role in the green turtle pathophysiologic response and for their potential use as diagnostic biomarkers. These findings enhance our ability to interpret sea turtle health and further progress conservation, research and rehabilitation programs for these ecologically important species.

scholarly journals Dietary analysis of two sympatric marine turtle species in the eastern Mediterranean

2021 ◽  
Vol 168 (6) ◽  
Author(s):  
Josie L. Palmer ◽  
Damla Beton ◽  
Burak A. Çiçek ◽  
Sophie Davey ◽  
Emily M. Duncan ◽  
...  
Keyword(s):  
Green Turtle ◽  
Eastern Mediterranean ◽  
Chelonia Mydas ◽  
Marine Turtle ◽  
Dietary Analysis ◽  
Low Frequencies ◽  
Turtle Species ◽  
Dietary Shift ◽  
Green Turtles ◽  
Loggerhead Turtles

AbstractDietary studies provide key insights into threats and changes within ecosystems and subsequent impacts on focal species. Diet is particularly challenging to study within marine environments and therefore is often poorly understood. Here, we examined the diet of stranded and bycaught loggerhead (Caretta caretta) and green turtles (Chelonia mydas) in North Cyprus (35.33° N, 33.47° E) between 2011 and 2019. A total of 129 taxa were recorded in the diet of loggerhead turtles (n = 45), which were predominantly carnivorous (on average 72.1% of dietary biomass), foraging on a large variety of invertebrates, macroalgae, seagrasses and bony fish in low frequencies. Despite this opportunistic foraging strategy, one species was particularly dominant, the sponge Chondrosia reniformis (21.5%). Consumption of this sponge decreased with increasing turtle size. A greater degree of herbivory was found in green turtles (n = 40) which predominantly consumed seagrasses and macroalgae (88.8%) with a total of 101 taxa recorded. The most dominant species was a Lessepsian invasive seagrass, Halophila stipulacea (31.1%). This is the highest percentage recorded for this species in green turtle diet in the Mediterranean thus far. With increasing turtle size, the percentage of seagrass consumed increased with a concomitant decrease in macroalgae. Seagrass was consumed year-round. Omnivory occurred in all green turtle size classes but reduced in larger turtles (> 75 cm CCL) suggesting a slow ontogenetic dietary shift. Macroplastic ingestion was more common in green (31.6% of individuals) than loggerhead turtles (5.7%). This study provides the most complete dietary list for marine turtles in the eastern Mediterranean.

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