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Article ; Online: Three Distinct Views of Deep Pelagic Community Composition Based on Complementary Sampling Approaches

Elizabeth D. Hetherington / C. Anela Choy / Erik V. Thuesen / Steven H. D. Haddock

Frontiers in Marine Science, Vol

2022 Volume 9

Abstract: Our perception of deep-sea communities has evolved as various sampling approaches have captured different components of deep-sea habitats. We sampled midwater zooplankton assemblages in Monterey Bay, California to quantify community composition ( ... ...

Abstract	Our perception of deep-sea communities has evolved as various sampling approaches have captured different components of deep-sea habitats. We sampled midwater zooplankton assemblages in Monterey Bay, California to quantify community composition (abundance and biomass) and biodiversity (at the Order level) across three depth ranges, and the effects of sampling methodology on community parameters. We collected zooplankton using two types of opening-closing trawls [Tucker Trawl and Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS)] and video recordings from a remotely operated vehicle (ROV). We quantified the relative contributions of microbes to community biomass using synoptic water-bottle casts and flow cytometry. Overall, the pelagic community was most similar between the Tucker trawl and ROV (dissimilarity = 52.4%) and least similar between the MOCNESS and ROV (dissimilarity = 65.8%). Dissimilarity between sampling methods was driven by the relative abundances of crustaceans and gelatinous taxa, where gelatinous animals (cnidarians, ctenophores, tunicates) were more abundant in ROV surveys (64.2%) and Tucker trawls (46.8%) compared to MOCNESS samples (14.5%). ROV surveys were the only method that sufficiently documented the most physically delicate taxa (e.g., physonect siphonophores, lobate ctenophores, and larvaceans). Biomass was also one order of magnitude lower in MOCNESS trawls compared to Tucker trawls. Due to these large differences, the relative contributions of microbes to total biomass were substantially lower in Tucker trawl samples (mean = 7.5%) compared to MOCNESS samples (mean = 51%). These results illustrate that our view of planktonic composition and community biomass is strongly dependent on sampling methodology.
Keywords	mesopelagic ; biodiversity ; gelatinous zooplankton ; community ecology ; Monterey Bay ; Science ; Q ; General. Including nature conservation ; geographical distribution ; QH1-199.5
Subject code	333
Language	English
Publishing date	2022-04-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Characterizing the secret diets of siphonophores (Cnidaria

Alejandro Damian-Serrano / Elizabeth D Hetherington / C Anela Choy / Steven H D Haddock / Alexandra Lapides / Casey W Dunn

PLoS ONE, Vol 17, Iss 5, p e

Hydrozoa) using DNA metabarcoding.

2022 Volume 0267761

Abstract: Siphonophores (Cnidaria: Hydrozoa) are abundant and diverse gelatinous predators in open-ocean ecosystems. Due to limited access to the midwater, little is known about the diets of most deep-dwelling gelatinous species, which constrains our understanding ...

Abstract	Siphonophores (Cnidaria: Hydrozoa) are abundant and diverse gelatinous predators in open-ocean ecosystems. Due to limited access to the midwater, little is known about the diets of most deep-dwelling gelatinous species, which constrains our understanding of food-web structure and nutrient flow in these vast ecosystems. Visual gut-content methods can rarely identify soft-bodied rapidly-digested prey, while observations from submersibles often overlook small prey items. These methods have been differentially applied to shallow and deep siphonophore taxa, confounding habitat and methodological biases. DNA metabarcoding can be used to assess both shallow and deep species' diets under a common methodological framework, since it can detect both small and gelatinous prey. We (1) further characterized the diets of open-ocean siphonophores using DNA metabarcoding, (2) compared the prey detected by visual and molecular methods to evaluate their technical biases, and (3) evaluated tentacle-based predictions of diet. To do this, we performed DNA metabarcoding analyses on the gut contents of 39 siphonophore species across depths to describe their diets, using six barcode regions along the 18S gene. Taxonomic identifications were assigned using public databases combined with local zooplankton sequences. We identified 55 unique prey items, including crustaceans, gelatinous animals, and fish across 47 siphonophore specimens in 24 species. We reported 29 novel predator-prey interactions, among them the first insights into the diets of nine siphonophore species, many of which were congruent with the dietary predictions based on tentilla morphology. Our analyses detected both small and gelatinous prey taxa underrepresented by visual methods in species from both shallow and deep habitats, indicating that siphonophores play similar trophic roles across depth habitats. We also reveal hidden links between siphonophores and filter-feeders near the base of the food web. This study expands our understanding of the ecological roles of ...
Keywords	Medicine ; R ; Science ; Q
Subject code	590
Language	English
Publishing date	2022-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The Pelagic Species Trait Database, an open data resource to support trait-based ocean research

Miram R. Gleiber / Natasha A. Hardy / Zachary Roote / Alana M. Krug-MacLeod / Caitlin J. Morganson / Zackary Tandy / Iris George / Cindy Matuch / Cole B. Brookson / Elizabeth A. Daly / Elan J. Portner / C. Anela Choy / Larry B. Crowder / Stephanie J. Green

Scientific Data, Vol 11, Iss 1, Pp 1-

2024 Volume 12

Abstract: Abstract Trait-based frameworks are increasingly used for predicting how ecological communities respond to ongoing global change. As species range shifts result in novel encounters between predators and prey, identifying prey ‘guilds’, based on a suite ... ...

Abstract	Abstract Trait-based frameworks are increasingly used for predicting how ecological communities respond to ongoing global change. As species range shifts result in novel encounters between predators and prey, identifying prey ‘guilds’, based on a suite of shared traits, can distill complex species interactions, and aid in predicting food web dynamics. To support advances in trait-based research in open-ocean systems, we present the Pelagic Species Trait Database, an extensive resource documenting functional traits of 529 pelagic fish and invertebrate species in a single, open-source repository. We synthesized literature sources and online resources, conducted morphometric analysis of species images, as well as laboratory analyses of trawl-captured specimens to collate traits describing 1) habitat use and behavior, 2) morphology, 3) nutritional quality, and 4) population status information. Species in the dataset primarily inhabit the California Current system and broader NE Pacific Ocean, but also includes pelagic species known to be consumed by top ocean predators from other ocean basins. The aim of this dataset is to enhance the use of trait-based approaches in marine ecosystems and for predator populations worldwide.
Keywords	Science ; Q
Subject code	590
Language	English
Publishing date	2024-01-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Harnessing a mesopelagic predator as a biological sampler reveals taxonomic and vertical resource partitioning among three poorly known deep-sea fishes

Elan J. Portner / Tor Mowatt-Larssen / Alejandro Cano-Lasso Carretero / Emily A. Contreras / Phoebe A. Woodworth-Jefcoats / Benjamin W. Frable / C. Anela Choy

Scientific Reports, Vol 13, Iss 1, Pp 1-

2023 Volume 15

Abstract: Abstract Pelagic predators are effective biological samplers of midtrophic taxa and are especially useful in deep-sea habitats where relatively mobile taxa frequently avoid observation with conventional methods. We examined specimens sampled from the ... ...

Abstract	Abstract Pelagic predators are effective biological samplers of midtrophic taxa and are especially useful in deep-sea habitats where relatively mobile taxa frequently avoid observation with conventional methods. We examined specimens sampled from the stomachs of longnose lancetfish, Alepisaurus ferox, to describe the diets and foraging behaviors of three common, but poorly known deep-sea fishes: the hammerjaw (Omosudis lowii, n = 79, 0.3–92 g), juvenile common fangtooth (Anoplogaster cornuta, n = 91, 0.6–22 g), and juvenile Al. ferox (n = 138, 0.3–744 g). Diet overlap among the three species was high, with five shared prey families accounting for 63 ± 11% of the total prey mass per species. However, distinct differences in foraging strategies and prey sizes were evident. Resource partitioning was greatest between An. cornuta that specialized on small (mean = 0.13 ± 0.11 g), shallow-living hyperiid amphipods and O. lowii that specialized on large (mean = 0.97 ± 0.45 g), deep-dwelling hatchetfishes. Juvenile Al. ferox foraged on a high diversity of prey from both shallow and deep habitats. We describe the foraging ecologies of three midtrophic fish competitors and demonstrate the potential for biological samplers to improve our understanding of deep-sea food webs.
Keywords	Medicine ; R ; Science ; Q
Subject code	590
Language	English
Publishing date	2023-09-01T00:00:00Z
Publisher	Nature Portfolio
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Author Correction

C. Anela Choy / Bruce H. Robison / Tyler O. Gagne / Benjamin Erwin / Evan Firl / Rolf U. Halden / J. Andrew Hamilton / Kakani Katija / Susan E. Lisin / Charles Rolsky / Kyle S. Van Houtan

Scientific Reports, Vol 10, Iss 1, Pp 1-

The vertical distribution and biological transport of marine microplastics across the epipelagic and mesopelagic water column

2020 Volume 1

Abstract: An amendment to this paper has been published and can be accessed via a link at the top of the paper. ...

Abstract	An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Keywords	Medicine ; R ; Science ; Q
Language	English
Publishing date	2020-01-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The vertical distribution and biological transport of marine microplastics across the epipelagic and mesopelagic water column

C. Anela Choy / Bruce H. Robison / Tyler O. Gagne / Benjamin Erwin / Evan Firl / Rolf U. Halden / J. Andrew Hamilton / Kakani Katija / Susan E. Lisin / Charles Rolsky / Kyle S. Van Houtan

Scientific Reports, Vol 9, Iss 1, Pp 1-

2019 Volume 9

Abstract: Abstract Plastic waste has been documented in nearly all types of marine environments and has been found in species spanning all levels of marine food webs. Within these marine environments, deep pelagic waters encompass the largest ecosystems on Earth. ... ...

Abstract	Abstract Plastic waste has been documented in nearly all types of marine environments and has been found in species spanning all levels of marine food webs. Within these marine environments, deep pelagic waters encompass the largest ecosystems on Earth. We lack a comprehensive understanding of the concentrations, cycling, and fate of plastic waste in sub-surface waters, constraining our ability to implement effective, large-scale policy and conservation strategies. We used remotely operated vehicles and engineered purpose-built samplers to collect and examine the distribution of microplastics in the Monterey Bay pelagic ecosystem at water column depths ranging from 5 to 1000 m. Laser Raman spectroscopy was used to identify microplastic particles collected from throughout the deep pelagic water column, with the highest concentrations present at depths between 200 and 600 m. Examination of two abundant particle feeders in this ecosystem, pelagic red crabs (Pleuroncodes planipes) and giant larvaceans (Bathochordaeus stygius), showed that microplastic particles readily flow from the environment into coupled water column and seafloor food webs. Our findings suggest that one of the largest and currently underappreciated reservoirs of marine microplastics may be contained within the water column and animal communities of the deep sea.
Keywords	Medicine ; R ; Science ; Q
Subject code	333
Language	English
Publishing date	2019-06-01T00:00:00Z
Publisher	Nature Publishing Group
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Tracing the biosynthetic source of essential amino acids in marine turtles using Î´13C fingerprints

Arthur, Karen E / Shaleyla Kelez / Thomas Larsen / C. Anela Choy / Brian N. Popp

Ecology. 2014 May, v. 95, no. 5

2014

Abstract: Plants, bacteria, and fungi produce essential amino acids (EAAs) with distinctive patterns of Î´Â¹Â³C values that can be used as naturally occurring fingerprints of biosynthetic origin of EAAs in a food web. Because animals cannot synthesize EAAs and ... ...

Abstract	Plants, bacteria, and fungi produce essential amino acids (EAAs) with distinctive patterns of Î´Â¹Â³C values that can be used as naturally occurring fingerprints of biosynthetic origin of EAAs in a food web. Because animals cannot synthesize EAAs and must obtain them from food, their tissues reflect Î´Â¹Â³CEAA patterns found in diet, but it is not known how microbes responsible for hindgut fermentation in some herbivores influence the Î´Â¹Â³C values of EAAs in their hosts' tissues. We examined whether distinctive Î´Â¹Â³C fingerprints of hindgut flora are evident in the tissues of green turtles (Chelonia mydas), which are known to be facultative hindgut fermenters. We determined Î´Â¹Â³CEAA values in tissues of green turtles foraging herbivorously in neritic habitats of Hawaii and compared them with those from green, olive ridley, and loggerhead turtles foraging carnivorously in oceanic environments of the central and southeast Pacific Ocean. Results of multivariate statistical analysis revealed two distinct groups that could be distinguished based on unique Î´Â¹Â³CEAA patterns. A threeâendâmember predictive linear discriminant model indicated that Î´Â¹Â³CEAA fingerprints existed in the tissues of carnivorous turtles that resembled patterns found in microalgae, which form the base of an oceanic food web, whereas herbivorous turtles derive EAAs from a bacterial or seagrass source. This study demonstrates the capacity for Î´Â¹Â³C fingerprinting to establish the biosynthetic origin of EAAs in higher consumers, and that marine turtles foraging on macroalgal diets appear to receive nutritional supplementation from bacterial symbionts in their digestive system.
Keywords	Caretta caretta ; Chelonia mydas ; Lepidochelys olivacea ; bacteria ; carbon ; carnivores ; dietary supplements ; essential amino acids ; fermentation ; fermenters ; flora ; food webs ; foraging ; fungi ; habitats ; herbivores ; hindgut ; hosts ; macroalgae ; microalgae ; models ; multivariate analysis ; sea turtles ; seagrasses ; symbionts ; tissues ; Hawaii ; Pacific Ocean
Language	English
Dates of publication	2014-05
Size	p. 1285-1293.
Publishing place	Ecological Society of America
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	1797-8
ISSN	0012-9658
ISSN	0012-9658
DOI	10.1890/13-0263.1
Database	NAL-Catalogue (AGRICOLA)

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Article: A global meta‐analysis of marine predator nitrogen stable isotopes: Relationships between trophic structure and environmental conditions

Pethybridge, Heidi / C. Anela Choy / John M. Logan / Valerie Allain / Anne Lorrain / Nathalie Bodin / Christopher J. Somes / Jock Young / Frederic Ménard / Clothilde Langlais / Leanne Duffy / Alistair J. Hobday / Petra Kuhnert / Brian Fry / Christophe Menkes / Robert J. Olson

Global ecology and biogeography. 2018 Sept., v. 27, no. 9

2018

Abstract: AIM: We examined potential environmental drivers of broad‐scale spatial patterns in the trophic structure of marine ecosystems as represented by nitrogen stable isotopes in globally distributed marine predators. Additionally, we assessed the effects of ... ...

Abstract	AIM: We examined potential environmental drivers of broad‐scale spatial patterns in the trophic structure of marine ecosystems as represented by nitrogen stable isotopes in globally distributed marine predators. Additionally, we assessed the effects of spatial scale on the predictive capabilities of environmental variables. LOCATION: Global oceans. TIME PERIOD: 2000 to 2015. MAJOR TAXA STUDIED: Tunas: Thunnus albacares, Thunnus obesus, Thunnus alalunga. METHODS: We undertook a global compilation and meta‐analysis of the bulk nitrogen stable isotope ratios (δ¹⁵N values) of three tuna species (n = 4,281). After adjusting for regional variations in baseline δ¹⁵N values using a global ocean biogeochemistry model, generalized additive mixed models were employed to infer global‐scale oceanographic controls of trophic structure, using cosmopolitan tuna species as a model. RESULTS: For the three tuna species, variation in trophic position estimated using bulk δ¹⁵N values was largely explained by geographical location and the corresponding oxygen minimum layer depth. Tuna trophic positions declined in areas with reduced oxygen at depth. Food‐chain length, as captured by maximum trophic position, was longer in areas of the western Pacific Ocean and shorter in the northern Atlantic and eastern Pacific Oceans. Trophic adaptability of the tuna predators, as indicated by intraspecific variability, was highest in the western and central Pacific Ocean and lowest in the northern Atlantic Ocean. Our analysis demonstrated that while tunas share similar functional trophic roles, deeper‐foraging tuna species had higher trophic positions globally. The predictive capacity of environmental variables decreased at finer (regional) spatial scales. MAIN CONCLUSIONS: Our work suggests that habitat compression resulting from the predicted global expansion of oxygen minimum zones with ocean warming will impact the trophic structure of marine food webs and the corresponding foraging habits of marine predators. Spatial scale analyses highlighted the importance of representing differences in regional ecological dynamics in global‐scale trophic and ecosystem models.
Keywords	Thunnus alalunga ; Thunnus albacares ; Thunnus obesus ; aquatic food webs ; biogeochemistry ; environmental factors ; food chain ; foraging ; habitats ; intraspecific variation ; marine ecosystems ; meta-analysis ; models ; nitrogen ; ocean warming ; oceans ; oxygen ; predators ; stable isotopes ; tuna ; Atlantic Ocean ; Pacific Ocean
Language	English
Dates of publication	2018-09
Size	p. 1043-1055.
Publishing place	John Wiley & Sons, Ltd
Document type	Article
Note	JOURNAL ARTICLE
ZDB-ID	2021283-5
ISSN	1466-8238 ; 1466-822X ; 0960-7447
ISSN (online)	1466-8238
ISSN	1466-822X ; 0960-7447
DOI	10.1111/geb.12763
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Global trophic position comparison of two dominant mesopelagic fish families (Myctophidae, Stomiidae) using amino acid nitrogen isotopic analyses.

C Anela Choy / Peter C Davison / Jeffrey C Drazen / Adrian Flynn / Elizabeth J Gier / Joel C Hoffman / Jennifer P McClain-Counts / Todd W Miller / Brian N Popp / Steve W Ross / Tracey T Sutton

PLoS ONE, Vol 7, Iss 11, p e

2012 Volume 50133

Abstract: The δ(15)N values of organisms are commonly used across diverse ecosystems to estimate trophic position and infer trophic connectivity. We undertook a novel cross-basin comparison of trophic position in two ecologically well-characterized and different ... ...

Abstract	The δ(15)N values of organisms are commonly used across diverse ecosystems to estimate trophic position and infer trophic connectivity. We undertook a novel cross-basin comparison of trophic position in two ecologically well-characterized and different groups of dominant mid-water fish consumers using amino acid nitrogen isotope compositions. We found that trophic positions estimated from the δ(15)N values of individual amino acids are nearly uniform within both families of these fishes across five global regions despite great variability in bulk tissue δ(15)N values. Regional differences in the δ(15)N values of phenylalanine confirmed that bulk tissue δ(15)N values reflect region-specific water mass biogeochemistry controlling δ(15)N values at the base of the food web. Trophic positions calculated from amino acid isotopic analyses (AA-TP) for lanternfishes (family Myctophidae) (AA-TP ∼2.9) largely align with expectations from stomach content studies (TP ∼3.2), while AA-TPs for dragonfishes (family Stomiidae) (AA-TP ∼3.2) were lower than TPs derived from stomach content studies (TP∼4.1). We demonstrate that amino acid nitrogen isotope analysis can overcome shortcomings of bulk tissue isotope analysis across biogeochemically distinct systems to provide globally comparative information regarding marine food web structure.
Keywords	Medicine ; R ; Science ; Q
Subject code	612
Language	English
Publishing date	2012-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Tracing the biosynthetic source of essential amino acids in marine turtles using Î´13C fingerprints

Arthur, Karen E. / Shaleyla Kelez / Thomas Larsen / C. Anela Choy / Brian N. Popp

Ecology

Volume v. 95,, Issue no. 5

Abstract	Plants, bacteria, and fungi produce essential amino acids (EAAs) with distinctive patterns of Î´Â¹Â³C values that can be used as naturally occurring fingerprints of biosynthetic origin of EAAs in a food web. Because animals cannot synthesize EAAs and must obtain them from food, their tissues reflect Î´Â¹Â³CEAA patterns found in diet, but it is not known how microbes responsible for hindgut fermentation in some herbivores influence the Î´Â¹Â³C values of EAAs in their hosts' tissues. We examined whether distinctive Î´Â¹Â³C fingerprints of hindgut flora are evident in the tissues of green turtles (Chelonia mydas), which are known to be facultative hindgut fermenters. We determined Î´Â¹Â³CEAA values in tissues of green turtles foraging herbivorously in neritic habitats of Hawaii and compared them with those from green, olive ridley, and loggerhead turtles foraging carnivorously in oceanic environments of the central and southeast Pacific Ocean. Results of multivariate statistical analysis revealed two distinct groups that could be distinguished based on unique Î´Â¹Â³CEAA patterns. A threeâendâmember predictive linear discriminant model indicated that Î´Â¹Â³CEAA fingerprints existed in the tissues of carnivorous turtles that resembled patterns found in microalgae, which form the base of an oceanic food web, whereas herbivorous turtles derive EAAs from a bacterial or seagrass source. This study demonstrates the capacity for Î´Â¹Â³C fingerprinting to establish the biosynthetic origin of EAAs in higher consumers, and that marine turtles foraging on macroalgal diets appear to receive nutritional supplementation from bacterial symbionts in their digestive system.
Language	English
Document type	Article
ISSN	0012-9658
Database	AGRIS - International Information System for the Agricultural Sciences and Technology

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