BackgroundResearch on ecosystem services has grown exponentially during the last decade. Most of the studies have focused on assessing and mapping terrestrial ecosystem services highlighting a knowledge gap on marine and coastal ecosystem services (MCES) and an urgent need to assess them.Methodology/Principal FindingsWe reviewed and summarized existing scientific literature related to MCES with the aim of extracting and classifying indicators used to assess and map them. We found 145 papers that specifically assessed marine and coastal ecosystem services from which we extracted 476 indicators. Food provision, in particular fisheries, was the most extensively analyzed MCES while water purification and coastal protection were the most frequently studied regulating and maintenance services. Also recreation and tourism under the cultural services was relatively well assessed. We highlight knowledge gaps regarding the availability of indicators that measure the capacity, flow or benefit derived from each ecosystem service. The majority of the case studies was found in mangroves and coastal wetlands and was mainly concentrated in Europe and North America. Our systematic review highlighted the need of an improved ecosystem service classification for marine and coastal systems, which is herein proposed with definitions and links to previous classifications.Conclusions/SignificanceThis review summarizes the state of available information related to ecosystem services associated with marine and coastal ecosystems. The cataloging of MCES indicators and the integrated classification of MCES provided in this paper establish a background that can facilitate the planning and integration of future assessments. The final goal is to establish a consistent structure and populate it with information able to support the implementation of biodiversity conservation policies.

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This document is a U.S. government work and is not subject to copyright in the United States. IndiSeas ("Indicators for the Seas") is a collaborative international working group that was established in 2005 to evaluate the status of exploited marine ecosystems using a suite of indicators in a comparative framework. An initial shortlist of seven ecological indicators was selected to quantify the effects of fishing on the broader ecosystem using several criteria (i.e., ecological meaning, sensitivity to fishing, data availability, management objectives and public awareness). The suite comprised: (i) the inverse coefficient of variation of total biomass of surveyed species, (ii) mean fish length in the surveyed community, (iii) mean maximum life span of surveyed fish species, (iv) proportion of predatory fish in the surveyed community, (v) proportion of under and moderately exploited stocks, (vi) total biomass of surveyed species, and (vii) mean trophic level of the landed catch. In line with the Nagoya Strategic Plan of the Convention on Biological Diversity (2011-2020), we extended this suite to emphasize the broader biodiversity and conservation risks in exploited marine ecosystems. We selected a subset of indicators from a list of empirically based candidate biodiversity indicators initially established based on ecological significance to complement the original IndiSeas indicators. The additional selected indicators were: (viii) mean intrinsic vulnerability index of the fish landed catch, (ix) proportion of non-declining exploited species in the surveyed community, (x) catch-based marine trophic index, and (xi) mean trophic level of the surveyed community. Despite the lack of data in some ecosystems, we also selected (xii) mean trophic level of the modelled community, and (xiii) proportion of discards in the fishery as extra indicators. These additional indicators were examined, along with the initial set of IndiSeas ecological indicators, to evaluate whether adding new biodiversity indicators provided useful additional information to refine our understanding of the status evaluation of 29 exploited marine ecosystems. We used state and trend analyses, and we performed correlation, redundancy and multivariate tests. Existing developments in ecosystembased fisheries management have largely focused on exploited species. Our study, using mostly fisheries independent survey-based indicators, highlights that biodiversity and conservation-based indicators are complementary to ecological indicators of fishing pressure. Thus, they should be used to provide additional information to evaluate the overall impact of fishing on exploited marine ecosystems.

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The relative trophic positions of Euphausia vallentini (juveniles and adults), E. longirostris (adults) and Nematoscelis megalops (adults) were investigated using samples collected in the vicinity of the Prince Edward archipelago during austral autumn (April/May) of 1998 on voyage 87 of the MV 'SA Agulhas'. Gut content analysis and stable nitrogen isotope measurements (δ 15 N) were performed on the same individuals. For comparative purposes, nitrogen isotope ratios of the copepod Calanus simillimis, the hyperid amphipod Themisto gaudichaudi and the fish Ceratoscopelus warmingi were also analysed. The results of the gut content analysis for E. vallentini juveniles showed that there was a high contribution of phytoplankton to the diet. Stable nitrogen isotope analysis supported this and indicated that E. vallentini juveniles occupied a similar trophic position to that of the copepod (mean δ 15 N values of 2.38 and 1.72 ‰ respectively). E. vallentini adults were found to be omnivorous, but the contribution of carnivory to the diet was difficult to determine. High phytoplankton and low mesozooplankton contributions to the diet from the gut content analysis suggested a predominantly herbivorous diet. However, the stable nitrogen isotope results showed that E. vallentini adults were closely grouped with T. gaudichaudi (mean δ 15 N values of 3.66 and 4.13 ‰ respectively), indicating a high degree of omnivory and a relatively large heterotrophic contribution to the diet. Irrespective of the degree of carnivory, a dietary shift with an increase in size was evident for this species. The gut content analysis of E. longirostris showed that this species consumed large amounts of both phytoplankton and metazoan prey. However, the stable nitrogen isotope analysis indicated a high degree of carnivory (mean δ 15 N = 6.88 ‰). Although the gut content analysis showed that N. megalops had a lower contribution of mesozooplankton to the diet compared to that of E. longirostris, the stable isotope analysis showed that these 2 species occupied a similar position (N. megalops mean δ 15 N = 6.83 ‰). The findings of this study support findings in the literature and show that E. vallentini juveniles are herbivorous and N. megalops adults are carnivorous. However, adults of E. vallentini and E. longirostris appear to have higher contributions of heterotrophic carbon to their diets than has been assumed and may occupy higher trophic positions than initially predicted. KEY WORDS: Sub-Antarctic euphausiids · Feeding ecology · Diet · Stable isotopes · Prince Edward IslandsResale or republication not permitted without written consent of the publisher