Assimilation of organic matter by two benthic consumers across gradients of latitude and nutrient enrichment

Andrea Nicastro*, Ka Man Lee, Melanie J. Bishop

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review


    In modifying the traits of producers, coastal development and latitude may influence the assimilation of organic matter resources by consumers. The aim of the present study was to assess spatial variation across gradients of latitude and diffuse nitrogen loading in: (1) the N content of the seagrass Zostera muelleri and the mangrove Avicennia marina; and (2) the ultimate organic matter sources (inferred from δ15N and δ13C signatures) of the detritivorous mud whelk Pyrazus ebeninus and the predatory polychaete Nephtys australiensis. It was hypothesised that the organic matter sources of each of the two consumers would vary spatially, following patterns of spatial variation in the N content of primary producers. Sampling in 12 estuaries of New South Wales, Australia, spanning 7° of latitude and variable nutrient loading revealed that the nitrogen content of Z. muelleri was negatively correlated with latitude and nitrogen loading, but the nitrogen content of A. marina leaves followed only latitude. Of the four organic matter sources considered by the present study, Z. muelleri was consistently the main source passed through the trophic chain to the detritivore P. ebeninus and the predator N. australiensis. Nevertheless, the proportionate contribution of Z. muelleri and microphytobenthos to the carbon sources of N. australiensis varied with latitude, the former negatively and the latter positively. These relationships suggest that latitude may influence carbon sources of consumers by modifying producer physicochemical traits. Journal compilation

    Original languageEnglish
    Pages (from-to)840-850
    Number of pages11
    JournalMarine and Freshwater Research
    Issue number5
    Publication statusPublished - 2017


    • carbon cycling
    • eutrophication
    • leaf traits
    • mixing model
    • producer palatability
    • trophodynamics


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