Journal ArticleDOI
Food web structure in a near-pristine mangrove area of the Australian Wet Tropics
Kátya G. Abrantes,Marcus Sheaves +1 more
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Carbon and nitrogen isotopic composition was used to identify the main sources of carbon and describe the main trophic pathways in Deluge Inlet, a near-pristine mangrove estuary in tropical north Queensland, Australia, to construct a general model for this food web.Abstract:
Carbon and nitrogen isotopic composition was used to identify the main sources of carbon and describe the main trophic pathways in Deluge Inlet, a near-pristine mangrove estuary in tropical north Queensland, Australia. Producers' δ13C varied from −28.9‰ for mangroves to −18.6‰ for seagrass. Animals were also well separated in δ13C (−25.4‰ to −16.3‰ for invertebrates and −25.2‰ to −17.2‰ for fish), suggesting considerable differences in ultimate sources of carbon, from a substantial reliance on mangrove carbon to an almost exclusive reliance on seagrass. In general, invertebrates had lower δ15N than fish, indicating lower trophic levels. Among fish, δ15N values reflected well the assumed trophic levels, as species from lower trophic levels had lower δ15N than species from higher trophic levels. Trophic levels and trophic length were estimated based on δ15N of invertebrate primary consumers (6.1‰), with results suggesting a food web with four trophic levels. There was also evidence of a high level of diet overlap between fish species, as indicated by similarities in δ13C for fish species of higher trophic levels. Stable isotope data was also useful to construct a general model for this food web, where five main trophic pathways were identified: one based on both mangrove and microphytobenthos, one on plankton, two on both microphytobenthos and seagrass, and one based mainly on seagrass. This model again suggested the presence of four trophic levels, in agreement with the value calculated based on the difference in δ15N between invertebrate primary consumers and top piscivores.read more
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Occurrence, bioavailability and toxic effects of trace metals and organic contaminants in mangrove ecosystems: a review.
TL;DR: The present paper reviews the current knowledge on the occurrence, bioavailability and toxic effects of trace contaminants in mangrove ecosystems and highlights the major data and methodological gaps which should be addressed to refine the risk assessment of trace pollutants in manGrove ecosystems.
Journal ArticleDOI
True Value of Estuarine and Coastal Nurseries for Fish: Incorporating Complexity and Dynamics
TL;DR: In this paper, the authors describe 10 key components of nursery habitat value grouped into three types: (1) connectivity and population dynamics (including connectivity, ontogenetic migration and seascape migration), (2) ecological and ecophys- iological factors (including ecotone effects, ecophysiological fac- tors, food/predation trade-offs and food webs) and (3) resource dynamics.
Journal ArticleDOI
Stable isotope‐based community metrics as a tool to identify patterns in food web structure in east African estuaries
TL;DR: Stable isotope-based Bayesian community-wide metrics are used to investigate patterns in trophic structure in five estuaries that differ in size, sediment yield and catchment vegetation cover in Mozambique and Kenya and the Rianila, and there was seasonality in troPHic structure at Ambila and Betsiboka, as Trophic diversity increased and trophi redundancy decreased from the prewet to the postwet season.
Journal ArticleDOI
Fishes and fisheries in tropical estuaries: The last 10 years
TL;DR: There has been an increase in knowledge of many aspects of the biology and ecology of tropical estuarine fishes, as well as significant changes to many tropical fisheries since 2002 as discussed by the authors.
Journal ArticleDOI
The relative importance of mangroves and seagrass beds as feeding areas for resident and transient fishes among different mangrove habitats in Florida and Belize: Evidence from dietary and stable-isotope analyses
TL;DR: The importance of considering fish ecology (residency and life status) and type of mangrove habitat when assessing the contribution ofMangrove prey to fish food webs in the western Atlantic region is emphasized.
References
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Journal ArticleDOI
The value of the world's ecosystem services and natural capital
Robert Costanza,Rudolf de Groot,Stephen Farberk,Monica Grasso,Bruce Hannon,Karin E. Limburg,Shahid Naeem,José M. Paruelo,Robert Raskin,Paul Suttonkk,Marjan van den Belt +10 more
TL;DR: In this paper, the authors have estimated the current economic value of 17 ecosystem services for 16 biomes, based on published studies and a few original calculations, for the entire biosphere, the value (most of which is outside the market) is estimated to be in the range of US$16-54 trillion (10^(12)) per year, with an average of US $33 trillion per year.
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Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur
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Journal ArticleDOI
Food Web Complexity and Community Dynamics
Gary A. Polis,Donald R. Strong +1 more
TL;DR: It is concluded that trophic cascades and top-down community regulation as envisioned by trophIC-level theories are relatively uncommon in nature.
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A distributed, architecture-centric approach to computing accurate recommendations from very large and sparse datasets
Hossein Saiedian,Serhiy Morozov +1 more
TL;DR: This work introduces a novel architecture model that supports scalable, distributed suggestions from multiple independent nodes, and proposes a novel algorithm that generates a more optimal recommender input, which is the reason for a considerable accuracy improvement.
Journal ArticleDOI
Source partitioning using stable isotopes: coping with too many sources.
TL;DR: This method is applied to a variety of environmental studies in which stable isotope tracers were used to quantify the relative magnitude of multiple sources, including plant water use, geochemistry, air pollution, and dietary analysis and gives the range of isotopically determined source contributions.