Isotope baseline shifts in pelagic food webs of the Gulf of Mexico

Dorado, Samuel; Rooker, Jay R.; Wissel, Björn; Quigg, Antonietta

doi:10.3354/meps09854

Cited by 58 publications

(52 citation statements)

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“…) and terrestrial inputs (e.g., Dorado et al . ). As a result, consumers shifting to more neritic habitats, such as the juvenile loggerheads, may consume higher trophic level and benthic prey (e.g., fish, red crabs, benthic invertebrates) than conspecifics in the more oceanic and pelagic habitats, like the CNP (Snover et al .…”

Section: Discussionmentioning

confidence: 97%

“…This process is more dominant in the oligotrophic western and central North Pacific (Liu & Kaplan 1989;Sohm, Webb & Capone 2011) leading to lower d 15 N values than those in the BCP. Second, higher trophic level and more neritic and benthic prey have higher d 15 N values due to isotopic fractionation (DeNiro & Epstein 1981;Minagawa & Wada 1984;Somes et al 2010) and terrestrial inputs (e.g., Dorado et al 2012). As a result, consumers shifting to more neritic habitats, such as the juvenile loggerheads, may consume higher trophic level and benthic prey (e.g., fish, red crabs, benthic invertebrates) than conspecifics in the more oceanic and pelagic habitats, like the CNP (Snover et al 2010;Peckham et al 2011;Witherington, Hirama & Hardy 2012).…”

Section: Discussionmentioning

confidence: 99%

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Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings

Tomaszewicz

Seminoff

Peckham

et al. 2017

Journal of Animal Ecology

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Summary Determining location and timing of ontogenetic shifts in the habitat use of highly migratory species, along with possible intrapopulation variation in these shifts, is essential for understanding mechanisms driving alternate life histories and assessing overall population trends. Measuring variations in multi-year habitat use patterns is especially difficult for remote oceanic species.To investigate the potential for differential habitat use among migratory marine vertebrates, we measured the naturally occurring stable nitrogen isotope (δ15N) patterns that differentiate distinct ocean regions to create a “regional isotope characterization”, analyzed the δ15N values from annual bone growth layer rings from dead-stranded animals, then combined the bone and regional isotope data to track individual animal movement patterns over multiple years.We used humeri from juvenile North Pacific loggerhead turtles (Caretta caretta), animals that undergo long migrations across the North Pacific Ocean (NPO), using multiple discrete regions as they develop to adulthood. Typical of many migratory marine species, ontogenetic changes in habitat use throughout their decades-long juvenile stage is poorly understood, but each potential habitat has unique foraging opportunities and spatially explicit natural and anthropogenic threats that could affect key life history parameters.We found a bimodal size/age distribution in the timing that juveniles underwent an ontogenetic habitat shift from the oceanic central North Pacific (CNP) to the neritic east Pacific region near the Baja California Peninsula (BCP) (42.7±7.2 vs. 68.3±3.4 cm carapace length, 7.5±2.7 vs. 15.6±1.7 years). Important to the survival of this population, these disparate habitats differ considerably in their food availability, energy requirements, and threats, and these differences can influence life history parameters such as growth, survival, and future fecundity. This is the first evidence of alternative ontogenetic shifts and habitat use patterns for juveniles foraging in the eastern NPO.We combine two techniques, skeletochronology and stable isotope analysis, to reconstruct multi-year habitat use patterns of a remote migratory species, linked to estimated ages and body sizes of individuals, to reveal variable ontogeny during the juvenile life stage that could drive alternate life histories and that has the potential to illuminate the migration patterns for other species with accretionary tissues.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings

Tomaszewicz

Seminoff

Peckham

et al. 2017

Journal of Animal Ecology

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“…The δ 13 C values (−26 to −18‰) of leptocephali collected in the GOM were comparable to coastal GOM larval fish species that derive their carbon from phytoplankton (Thayer et al , ), thus supporting a diet consisting of material at or near the base of the food chain. These values were often more depleted than surface POM; however, POM is influenced by factors such as depth, freshwater–terrestrial input or diazotrophy (Dorado et al , ; Mintenbeck et al , ). Additionally, warm‐core rings, such as the one present at AT340 (Ross et al , ), can alter the isotopic composition in POM and zooplankton (Waite et al , ).…”

Section: Discussionmentioning

confidence: 99%

Assemblage structure, vertical distributions and stable‐isotope compositions of anguilliform leptocephali in the Gulf of Mexico

Quattrini

McClain‐Counts

Artabane

et al. 2019

Journal of Fish Biology

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In August 2007, October 2008 and September–October 2010, 241 Tucker trawl and plankton net tows were conducted at the surface to depths of 1377 m at six locations in the northern and eastern Gulf of Mexico (GOM) to document leptocephalus diversity and determine how assemblage structure, larval size, abundance and isotopic signatures differ across the region and with depth. Overall, 2696 leptocephali representing 59 distinct taxa from 10 families were collected. Five families accounted for 96% of the total catch with Congridae and Ophichthidae being the most abundant. The top four most abundant species composed 59% of the total catch and included: Ariosoma balearicum, Paraconger caudilimbatus, Rhynchoconger flavus and Ophichthus gomesii. Four anguilliform species not previously documented in the GOM as adults or leptocephali were collected in this study, including Monopenchelys acuta, Quassiremus ascensionis, Saurenchelys stylura and one leptocephalus only known from its larval stage, Leptocephalus proboscideus. Leptocephalus catches were significantly greater at night than during the day. Catches at night were concentrated in the upper 200 m of the water column and significantly declined with increasing depth. Leptocephali abundances and assemblages were significantly different between sites on the upper continental slope (c. 500 m depth) and sites on the middle to lower continental slope (c. 1500–2300 m). Sites on the lower continental slope had a mixture of deep‐sea demersal, bathypelagic and coastal species, whereas upper‐slope sites contained several numerically dominant species (e.g., A. balearicum, P. caudilimbatus) that probably spawn over the continental shelf and upper slope of the GOM. Standard lengths of the four dominant species differed between sites and years, indicating heterochronic reproduction and potential larval source pools within and outside of the GOM. Stable‐isotope analyses (δ13C and δ15N) conducted on 185 specimens from six families revealed that leptocephali had a wide range of isotopic values at the family and size‐class levels. Species in the families Muraenidae, Congridae and Ophichthidae had similar δ15N values compared with the broad range of δ15N values seen in the deep‐sea families Nemichthyidae, Nettastomatidae and Synaphobranchidae. Stable‐isotope values were variably related to length, with δ15N values being positively size correlated in ophichthids and δ13C values being negatively size correlated in A. balearicum and P. caudilimbatus. Results suggest that leptocephali feed in various water depths and masses, and on different components of POM, which could lead to niche partitioning. Ecological aspects of these important members of the plankton community provide insight into larval connectivity in the GOM as well as the early life history of Anguilliformes.

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“…, Dorado et al. , Zhao and Quigg ). At Station ALOHA, they found a significant increase in large cells (such as diatoms) and carbon fixation rates after nutrient additions in surface waters, especially in summer, leading to an increase in carbon export (Mahaffey et al.…”

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confidence: 99%

The 24 hour recovery kinetics from n starvation in Phaeodactylum tricornutum and Emiliania huxleyi

Zhao

Wang

Quigg

2015

Journal of Phycology

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The response of N (nitrate) starved cells of the diatom Phaeodactylum tricornutum and the coccolithophore Emiliania huxleyi to a pulse of new N were measured to investigate rapid cellular and photosynthetic recovery kinetics. The changes of multiple parameters were followed over 24 h. In P. tricornutum, the recovery of Fv /Fm (the maximum quantum yield of PS II) and σPSII (the functional absorption cross-section for PSII) started within the first hour, much earlier than other parameters. Cellular pigments did not recover during the 24 h but the chlorophyll (chl) a/carotenoid ratios increased to levels measured in the controls. Cell division was independent of the recovery of chl a. In E. huxleyi, the recovery of Fv /Fm and σPSII started after an hour, synchronous with the increase in cellular organic N and chl a with pigments fully recovered within 14 h. P. tricornutum prioritized the recovery of its photosynthetic functions and cell divisions while E. huxleyi did not follow this pattern. We hypothesize that the different recovery strategies between the two species allow P. tricornutum to be more competitive when N pulses are introduced into N-limited water while E. huxleyi is adapted to N scarce waters where such pulses are infrequent. These findings are consistent with successional patterns observed in coastal environments. This is one of only a few studies exploring recovery kinetics of cellular functions and photosynthesis after nitrogen stress in phytoplankton. Our results can be used to enhance ecological models linking phytoplankton traits to species diversity and community structure.

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Isotope baseline shifts in pelagic food webs of the Gulf of Mexico

Cited by 58 publications

References 56 publications

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings

Assemblage structure, vertical distributions and stable‐isotope compositions of anguilliform leptocephali in the Gulf of Mexico

The 24 hour recovery kinetics from n starvation in Phaeodactylum tricornutum and Emiliania huxleyi

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Isotope baseline shifts in pelagic food webs of the Gulf of Mexico

Cited by 58 publications

References 56 publications

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ15N values from bone growth rings

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ15N values from bone growth rings

Assemblage structure, vertical distributions and stable‐isotope compositions of anguilliform leptocephali in the Gulf of Mexico

The 24 hour recovery kinetics from n starvation in Phaeodactylum tricornutum and Emiliania huxleyi

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Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings

Intrapopulation variability in the timing of ontogenetic habitat shifts in sea turtles revealed using δ¹⁵N values from bone growth rings