Plastic particles in fulmar stomachs in the North Sea
D10 - Marine Litter
D10C1 - Litter (excluding micro-litter) D10C2 - Micro-litter D10C3 - Litter ingested
Currently 56% of beached North Sea fulmars have more than 0.1 g of plastics in their stomachs, exceeding the OSPAR long-term goal of 10%. This reflects the abundance of floating litter and provides an indication of harm. The amounts of ingested plastics have decreased significantly over the past ten years.
Litter is widespread in the marine environment and is harmful to wildlife and the ecosystem. OSPAR and the European Commission aim to substantially reduce the amount marine litter in the OSPAR Maritime Area by 2020 to levels where properties and quantities do not cause harm to the marine environment. The quantity of plastics ingested by marine wildlife mainly reflects the abundance of floating litter in their environment.
OSPAR monitors and assesses plastics in the stomachs of northern fulmars as one of its indicators of environmental quality. Fulmars are abundant and widespread seabirds known to regularly ingest litter, with nearly all individuals having at least some plastic in their stomachs. Although fulmars forage near the water surface, their stomachs may also contain items from deeper water or items that may be indirectly ingested through their prey.
The fulmar Indicator Assessment approach is based on a previous OSPAR Ecological Quality Objective (EcoQO). The monitoring program uses corpses of beached birds or individuals accidentally killed. OSPAR has a long term goal of less than 10% of fulmars exceeding a level of 0.1 gram of plastic in their stomachs. Research methods and results have been published in reports and peer-reviewed scientific literature and dedicated OSPAR Guidelines. Whilst this indicator is currently only used in the North Sea it is also suitable for implementation in the Greater North Sea, Arctic and Celtic Seas, and has already been used in fulmar studies elsewhere in the North Atlantic and North Pacific.
Many marine organisms, including seabirds, turtles, marine mammals, fish, crustaceans, shellfish and zooplankton ingest man-made debris that they encounter in their marine environment (Kühn et al. 2015). The quantity of litter ingested and found in animal stomachs or intestines, in particular that of persistent materials such as plastics, reflects the abundance of marine litter, the associated harm to wildlife and the marine ecosystem, and socio-economic harm.
Within its system of Common Indicators, OSPAR has agreed to the monitoring of plastic abundance in stomachs of seabirds as an indicator for levels and trends in marine litter floating at the surface of the North Sea. Northern fulmars (Fulmarus glacialis) forage near the water surface, but stomachs may additionally contain items from deeper water or the seabed. These items could be indirectly ingested through prey or directly when litter is transported vertically from the deeper parts of the North Sea to the surface. The indicator has been implemented through long term monitoring of plastic abundance in stomach contents of the northern fulmar (OSPAR EcoQO no. 3.3) (OSPAR 2009, 2010a,b; 2014a,b). The fulmar EcoQO approach has been taken up as an OSPAR Common Indicator Assessment for the Intermediate Assessments 2017 and 2019.
The European Commission, in its European Marine Strategy Framework Directive (MSFD) refers to marine litter policies under its Descriptor 10 which states that ‘Properties and quantities of marine litter do not cause harm to the coastal and marine environment’ (EC 2008, 2010, 2017). Monitoring of plastic ingestion by marine wildlife is currently described under the criteria D10C3 (EC 2017).
Within the European MSFD, the OSPAR Common Indicator for the Fulmar has been presented as a species relevant in criteria D10C3 for the Greater North Sea, Arctic Waters, and Celtic Seas (EC 2008; EC 2010; Galgani et al. 2010; EC 2017). Plastic objects ingested by fulmars may range in size from few mm to several cm, and can be considerably larger for flexible items. Fulmars thus monitor both the litter and microlitter described under D10C3 (EC 2017). In addition, because fulmar feeding is largely restricted to surface feeding, the indicator has also relevance for the criteria D10C1 and D10C2 for litter and micro-litter, respectively, in the surface layer of the water column. The fulmar approach has been taken as example for other biota indicators. The purpose of such monitoring of plastic abundance ingested by wildlife is
- to obtain a quantitative measure for spatial and temporal patterns in the abundance and composition of marine litter, in particular plastics, mainly floating at the surface and;
- to provide an indication of ecological harm caused by such litter.
In its recent wording (EC 2017) the MSFD has broadened its monitoring scope to ingestion of litter and micro-litter by marine species, and the earlier concept (OSPAR and EC 2010) of ecological harm has been redefined as ‘a level that does not adversely affect the health of the species concerned’. Fulmar monitoring methods and results have been published in regular reports and peer-reviewed scientific literature (Van Franeker et al. 2011; Van Franeker & Law 2015). Dedicated OSPAR guidelines have been published in 2015 to guarantee consistent monitoring methods and uniform submission of data by all OSPAR contracting parties (OSPAR 2015a,b; http://www.ospar.org/convention/agreements?q=fulmar).
Suitability of fulmars for monitoring marine litter
Fulmars are pelagic (open sea) seabirds that belong to the large group of the tubenoses (Procellariiformes) of which the albatrosses are the best known representatives. These birds forage exclusively at sea and never on land, and rarely forage close to shore. The fulmar is a poor diver, and thus feeds of what is available at or within a few meters from the water surface. Like most tubenosed seabirds, fulmars regularly ingest a variety of marine debris, probably mostly taken directly and intentionally because resembling prey, or unintentionally when mixed with attractive food wastes. But indirect ingestion will also occur, e.g. through preying on fish with ingested plastics or scavenging on guts of other dead animals. Size details of plastics ingested indicated that roughly 90% of ingested plastic items (not threads or soft sheets) found in the first glandular stomach of fulmars is 10mm or less in size, and over 50% is 5mm or less (Bravo Rebolledo 2011). The definition for micro-plastics as items smaller than 5mm was introduced by an international expert workshop (Arthur et al. 2009), and this definition has been copied into particle size definitions used in the Marine Strategy Framework Directive (MSFD). MSFD defines litter smaller than 5mm as micro-particles, between 5mm and 25mm as meso-particles, and items over 25mm as macro-debris (MSFD-TSGML 2011). Thus, litter ingested by fulmars is mostly in the micro- and meso-size ranges. Unlike most gulls, fulmars normally do not regurgitate indigestible components of their diet, but gradually grind these in their muscular stomach (gizzard) until particles are worn or broken into sizes small enough to pass into the intestines and be excreted (which appears to happen at particle size of roughly 2mm to 3mm (Bravo Rebolledo 2011)). As a consequence, fulmar stomach contents integrate litter abundance encountered during feeding for a number of days to weeks (Van Franeker & Law 2015).
OSPAR’s Quality Status Report (OSPAR 2010a) included an assessment of the North Sea EcoQO on plastic particles in seabird stomachs. The percentage of fulmars in the Greater North Sea with more than 0.1 g of plastic in the stomach ranged from 45% to over 60%. The English Channel area was the most heavily polluted area while the Scottish Islands were the ‘cleanest’ with a mean mass for plastics in fulmars of about a third of the level encountered in the English Channel. Data from the Faroe Islands (Arctic Waters) were included for comparison. The EcoQO was probably only achieved in Arctic populations. A long monitoring series from the Netherlands showed a significant reduction in plastic abundance from 1997 to 2006, mainly through a reduction in raw industrial plastics.
In OSPARs first intermediate assessment (OSPAR 2017) among 525 fulmar stomachs analysed over the period 2010-2014, 93% had some ingested plastic, 58% contained more than 0.1 g of plastic, and average values per bird were 33 particles and 0.31g. Fulmars from the English Channel had the highest plastics load, slightly lower levels being observed further north. No significant increases or decreases in ingested plastic mass were observed in the North Sea as a whole or in any of the five sub-regions.
The Fulmar EcoQO methodology is also being used elsewhere in the North Atlantic and North Pacific areas (e.g. Provencher et al. 2009; Avery-Gomm et al. 2012, 2018; Kühn & Van Franeker 2012; Bond et al. 2014; Trevail et al., 2015; Herzke et al. 2016; Mallory 2008; Nevins et al. 2011; Donnely-Greenan et al. 2014; Bond et al. 2014; Poon et al. 2017; Terepocki et al. 2017) allowing wide spatial comparisons of marine litter in European waters and other north Atlantic and Pacific regions.
Long term monitoring in the Netherlands
In the Dutch sector of the North Sea, changes in stomach contents of fulmars have been monitored since the 1980s. Although overall abundance of plastics in stomachs have shown unexplained changes over time (Figure a.A), rapid reductions in abundance of industrial plastic within one to two decades (Figure a.B) have shown that fulmar stomach contents rapidly reflect changes in source specific plastic abundances in their environment (Van Franeker et al. 2011; Van Franeker & Law 2015), and are thus an effective way to assess the success of policy measures, reflecting the improved environmental quality for marine organisms and the pelagic marine environment. The early rapid reduction of industrial plastic litter is believed to reflect a response from industry and transport sectors to media attention for omnipresent industrial plastic debris in the 1980s in combination with the economic incentive to reduce loss of valuable source materials. Lack of similar incentives for consumer types of plastic debris is believed to explain the different trend in these materials.
At this point in time, OSPAR IA 2019 indicator assessment values are not necessarily to be considered as equivalent to proposed EU MSFD criteria threshold values, but can be used for the purposes of their MSFD obligations by those Contracting Parties that wish to do so.
Full details of methods have been provided in the OSPAR Guidelines for Monitoring of plastic particles in stomachs of fulmars in the North Sea area ( http://www.ospar.org/convention/agreements?q=fulmar ) and repeated here only in a descriptive summary.
Corpses of dead beached birds or accidentally killed specimens are collected mostly by volunteer networks, but processed at experienced laboratories. At dissection, in addition to date, the finding location is specified by a system of area codes and geographical coordinates for the area or more detailed location. Based on several internal and external anatomical characters, birds are classified as either adult or non-adult age group. The pilot study for fulmar monitoring (Van Franeker & Meijboom 2002) showed that age is a relevant variable as younger birds generally have more plastics in the stomach than adults. Thus, in cases where samples to be compared have strongly different age compositions, analyses may need to be specified for separate age groups. Because age characters are sex specific, data recording includes sex, although there is currently no evidence for a relevant influence of gender on plastic abundance in stomachs.
Stomach contents are carefully rinsed in a sieve with a 1mm mesh and then transferred to a petri dish for sorting under a binocular microscope. The 1mm mesh is used because smaller meshes become easily clogged with mucus from the stomach wall and with food remains. Analyses using smaller meshes were found to be extremely time consuming and particles smaller than 1mm are very rare in the stomachs (Bravo Rebolledo 2011) and thus contribute little to numerical abundance of particles and even much less to plastic mass.
Two main plastic categories are distinguished in the OSPAR Common Indicator. Industrial plastic granulate (‘pellets’) are separated from consumer debris such as sheets, foams, threadlike materials, hard fragments etc. For each of these categories the number of particles and mass (in gram to 4th decimal) is recorded. The final assessment is based only on total weight of plastic in stomachs, but industrial and consumer waste plastics have different sources and backgrounds and as such provide very useful information for the interpretation of the monitoring data and thus for priorities in policy measures to be considered.
Data thus collected can be used to calculate for specified samples:
• the frequency of occurrence (%FO) the proportion of birds having plastic in the stomach (also referred to as ’incidence’ or ‘prevalence’)
• arithmetic average and standard error (avg±se) of the mean for number or mass of plastic
• EcoQO performance (EcoQO%), being the percentage of birds exceeding the level of 0.1g of ingested plastic as defined in the OSPAR EcoQO long term goal
The reference level for presence of plastics in stomachs of northern fulmars (or any marine organism) is zero, as synthetic materials are solely manmade, and were only introduced into the marine environment since about the mid-1900s.
However, accepting that incidental losses are unavoidable OSPAR (2008, 2009), has defined an (undated) long term goal for the fulmar EcoQO 3.3 in the North Sea as:
“There should be less than 10% of northern fulmars (Fulmarus glacialis) having more than 0.1 g plastic particles in the stomach in samples of 50 to 100 beach-washed fulmars from each of 4 to 5 areas of the North Sea over a period of at least five years”.
Thus, from this definition, the basic monitoring information required is the total mass of plastic in individual stomachs, and the percentage of stomachs exceeding the 0.1g level (referred to as ‘EcoQO performance’ or ‘EcoQO%’).
The OSPAR Assessment for abundance of plastics in stomachs of northern fulmars is therefore calculated as percentage of investigated birds exceeding the 0.1g level of plastics in the stomach (EcoQO Performance in %) over the most recent 5-year period of available data.
In this second Intermediate Assessment (IA-2), this is the 5-year period of 2012 to 2016. It is important to emphasize that all data on average ingested debris or EcoQO performances are so called ‘population averages’, meaning that clean birds without any plastic in the stomachs are included in all the calculations. Analyses in the pilot study by Van Franeker & Meijboom (2002) have shown that about 40 stomachs are the recommended minimum sample size to obtain a reliable figure for plastic ingestion representative for a selected area and period of time. This recommended sample size should be taken into account when spatial aggregations of data are being made.
For the fulmar indicator, OSPAR has sub-divided the Greater North Sea into 5 sub-regions: Significant differences between part of these regions existed, with highest level of pollution in the Channel area, gradually decreasing to more northern regions within the North Sea and beyond (Van Franeker et al. 2011; Van Franeker & Law 2015).
OSPAR has set the same long term goal for all these North Sea areas, however the timeline for reaching this long term goal is not specified, but is certainly relevant for policies under the European Marine Strategy Framework Directive (MSFD) in Descriptor 10. Good Environmental Status (GES) has to be achieved by 2020 (EC 2008, 2010, 2017). However, OSPARs Regional Action Plan for marine litter (OSPAR 2014a) has not yet identified regional or overall targets to be achieved by 2020. It appears that current national ambitions vary widely from the original OSPAR EcoQO long term goal to unspecified rates of change (Van Acoleyen et al. 2014). Tendency seems a wording which requires by 2020 a significant change in the direction of the long-term OSPAR target. Power analyses of Dutch data in the pilot study by Van Franeker & Meijboom (2002) indicated that fulmar monitoring data may be expected to be able to detect statistically significant trends (p<0.05) over time periods of at least 4-8 years depending on the type of plastics considered: periods of significant change indeed have been observed in early monitoring years, for consumer plastics, but for industrial plastics in particular (Van Franeker et al. 2011; Van Franeker & Law 2015). Trends in quantities of plastics ingested can be visually illustrated as the annual updates of running 5-year averages in plastic mass or the five year figures for EcoQO performance. In such graphs, each data point thus overlaps with four years of data from the previous data point. This ‘smoothens’ most ad-hoc variability in the data and emphasizes longer-term trends. However, these are only graphic illustrations without statistical meaning. As agreed in OSPAR and published in scientific peer-reviewed literature, the method to statistically evaluate trends of increase or decrease in plastic ingestion, use linear regression analysis of log transformed mass of plastics in individual birds against the year of sampling over a period of the most recent ten years. An additional less detailed way to test for change is a GLM approach (Generalized Linear Modelling), in which annual data for sample size and proportions of birds with over 0.1g of plastic in the stomach are evaluated in a logistic analysis dedicated for binomial distributions and using logit transformed data.
For evaluation of regional differences, plastic data were fitted in a negative binomial generalized linear model with region included as a factor, and the test statistic is a t-score based on residual variance for the region (Van Franeker et al. 2011). Data for the current analyses were stored in Oracle. Graphs were made up in Microsoft Excel and statistical analyses for time trends or regional differences were conducted in Genstat, 19th Edition (VSN International 2017). Frequencies of occurrence between two data sets (time periods, or regions) were tested using the 2-sample z-test to compare sample proportion according to Brown et al. (2001) using http://epitools.ausvet.com.au/content.php?page=z-test-2 .
Assessment 2012 - 2016:
Over the five year period 2012-2016, the OSPAR long term goal in terms of plastic litter ingestion by seabirds was not reached anywhere in the North Sea. Among 514 fulmar stomachs analysed over the 2012-2016 period, 56% contained more than 0.1g of plastic, whereas OSPAR’s long term goal is to reduce this EcoQO% to less than 10%. Of all birds analysed, 95% had some ingested plastic, and average values per individual were 31 particles and 0.28g per bird. Regionally the EcoQO% ranged from 50% in the Skagerrak to 75% in the Channel. Within the North Sea the earlier tendency for decreasing plastic loads further north has become less clear due to increased levels of plastic ingestion on the Scottish Islands. The latter increase cannot be explained at present. However, on the larger scale of the Northeast Atlantic, a latitudinal pattern remains evident. Figure 1 shows the sub-regional differences in ingested plastics in the North Sea. Only in the far north-western Atlantic (the Canadian Arctic), plastic ingestion levels come really close to the long-term OSPAR EcoQO target. In the North Sea, during the 2007-2011 5-year period preceding the current assessment, 63% of North Sea fulmars exceeded the 0.1g plastic level (average 0.37 g per bird). In the first assessment period 2010-2014 these decreased to 58% and 0.31 g. The 56% and 0.28 g calculated for the IA2 period 2012-2016 suggest a continued decrease, that however has to be evaluated in the agreed statistical approach.
Trends 2007 - 2016
Time related trends in the fulmar monitoring program are tested over periods of 10 years. The first Intermediate assessment 2005-2014 had not revealed any change. However, over all North Sea sub-regions combined, the current 2007-2016 analyses show significant declines in both the ingested plastic mass (p<0.001) and the annual percentage of birds with over 0.1g of plastic (p=0.002). Statistical significant progress in the direction of the long-term target, as an informal provisional aim for MSFD is thus achieved. The data for the separate five sub-regions (Figure 1) showed no statistically significant changes except for a decline in EcoQO% for the fulmars from east England (Figure 2). This illustrates for this indicator the statistical advantage of the regional North Sea assessment, due to the analysis of more samples.
There is high confidence in both the methodology and data availability.
Within the North Sea an earlier tendency of decreasing levels of ingested plastics in fulmar stomachs when going from south (Channel sub-region) to north has not proven to be consistent. Along the eastern board the pattern persisted with decreasing plastic levels from Channel to Skagerrak. However, along the western board, increased levels of plastic in fulmars from the Scottish Islands showed an opposite pattern. An explanation for the increased level of plastic ingestion in the Scottish Islands is currently lacking. Over the larger scale of the northeast Atlantic, the pattern is consistent, with significant lower plastic abundance on Faroe Islands, Iceland, northern Norway and Svalbard than in the North Sea (Figure c and Table a).
No significant increases or decreases in ingested plastic mass were observed in the North Sea as a whole or in any of the five sub-regions for the period considered in this assessment (2005–2014) (Figure 4, Table b). However, trends have been documented with longer datasets. In the Netherlands, plastic ingestion by fulmars increased from the 1980s to peak in the mid-1990s, this was followed by a decrease back to earlier levels (Figure a) and stability in the 2000s up to the current assessment.
Underlying this overall trend were patterns that strongly differed for industrial plastic pellets and for consumer plastics.
The rapid decrease in industrial plastic granules in the North Sea has not continued into the 2000s. No major changes have been observed in any of the North Sea sub-regions. Except for a near significant decrease along the Eastern English coast, changes in sub-regions have been statistically non-significant. Overall, 58% of fulmars currently have industrial plastics in their stomach, see table c, with an average of 3.1 pellets, equivalent to a mass of 0.07 g, per bird (based on a total of 525 birds), which is less than half the amount measured in the 1980s. This assessment shows consumer plastic debris in fulmar stomachs has been more or less stable since the early 2000s. Overall 93% of fulmar stomachs contain some consumer plastic, with an average of approximately 30 particles (0.24 g) per stomach. Figure c illustrates using five-year running averages, with sub-regional data for the 2010–2014 assessment shown in Table c. The results of the statistical analysis is shown in Table d, and illustrated for the total North Sea in Figure d.
There is high confidence in the fulmar method. This is based on a suite of peer-reviewed international publications on this method and its results, and on the long history of this indicator.
There is high confidence in data availability owing to the relatively long time series available and many data points per North Sea monitoring region. In the English Channel (one of the five subareas in the North Sea) data availability has become too low in recent years. However, for the overall assessment of the North Sea (using the EcoQO assessment value and trend analysis, respectively) this is not a problem, because the total number of data points for the full period (five years for the EcoQO assessment value and ten years for trend analysis) is still high.
Since the early 2000s, levels of plastic ingestion by fulmars in the North Sea appear to have stabilised at around 60% of individuals exceeding the 0.1 g level of plastic ingestion specified in the OSPAR long-term goal definition. When considering the growth in marine activity and the increasing proportion of plastics in wastes, the observed stability in the indicator could be viewed positively. Even though the OSPAR long-term goal is still distant, it remains valid as a global assessment level.
Fulmar populations in the North Sea are currently in decline, as highlighted in the Marine Bird Abundance indicator assessment, but the causes of the decline are not well understood. Ingestion of plastic litter is recognised as a potential threat contributing to the status of fulmar populations, given that it is probable that sub-lethal effects of reduced body condition and health, affect a significant proportion of individuals in the population.
The OSPAR Regional Action Plan identifies actions to reduce marine litter and their implementation should lead to a reduction in the amount of litter ingested by fulmars.
Responsiveness of the indicator
The average fulmar in the North Sea has around 30 plastic particles with a combined mass of about 0.3 g in the stomach. Fewer than one in ten fulmars has no plastic in the stomach at the time of death. About 20% of plastic mass is industrial plastic pellets, the remainder being consumer plastic waste. In the early 1980s that ratio was about fifty-fifty, which implies plastic composition has undergone a substantial change in the past few decades, even if total plastic mass in stomachs is currently similar to that in the 1980s. The early rapid changes in the mass of ingested plastic in different subcategories are important to emphasise, because this provides evidence that effective measures to reduce inputs of plastics to the marine environment have a rapid effect, not only near the source as evidenced by fulmars in the North Sea, but by implication also in the main oceanic gyres (Van Franeker and Law, 2015).
Losses of industrial plastic pellets to the marine environment were significantly reduced over a period of one to two decades, but this reduction was counteracted by increased inputs of consumer plastic waste. These important and rapid changes cannot be documented for the other sub-regions of the North Sea because data collection on plastics in fulmar stomachs only started after the period in which major changes occurred in the Dutch sector of the North Sea. However, the early Dutch data have been supported by very similar results in other seabird studies around the world (see Van Franeker and Law, 2015). The rapid reduction in industrial plastic granules was not only seen in source areas such as the North Sea, but was followed by similar reductions in densities of industrial plastic granules in the large oceanic gyres. Rapid reductions were probably achieved because the industrial pellets are raw feedstock with economic value. Considerable publicity in the 1970s and 1980s on losses of industrial pellets to the marine environment (Colton et al., 1974; Wong et al., 1974; Gregory, 1978; Shiber, 1979, 1982; Morris, 1980) and their ingestion by a wide range of marine wildlife (e.g. Bourne and Imber, 1982; Connors and Smith, 1982; Day et al., 1985) led to measures reducing losses around factories, processing plants and during transport. Although no published information on specific measures by industry or transport sectors is known from the 1980s, industrial concern was flagged in 1991 by the dedicated Operation Clean Sweep campaign (US EPA, 1993). Because of these early changes, it is important to continue to make a distinction in monitoring of industrial as opposed to consumer plastics, as they have provided evidence that rapid improvements in environmental quality are a realistic possibility if input of plastic debris is effectively reduced.
Validity of the OSPAR long term goal
The OSPAR long-term goal of no more than 10% of fulmars exceeding the 0.1 g threshold of plastic could be seen as a global background level because this level currently does exist in relatively clean Arctic marine environments such as the Canadian Arctic (Van Franeker et al., 2011; Kühn and Van Franeker, 2012, compiled from Mallory et al., 2006, Mallory, 2008 and Provencher et al., 2009 with additional information from the authors).
Harm to biota
The 0.1 g threshold in combination with a percentage of fulmars not allowed to exceed the threshold is not based on a quantitative assessment of harm to fulmars. Individual fulmars and other wildlife can die and suffer severely from the ingestion of plastic, but such effects are hard to quantify in terms of reductions in populations or species. Sub-lethal effects on many individuals may have population effects, even if they are difficult to quantify. Further research to document such sub-lethal effects is therefore warranted.
Descriptor 10 of the EU MSFD states that levels of marine litter should not cause harm to the marine and coastal environment. Harm to wildlife is a very complex concept, which in spite of dedicated research (Browne et al., 2015; Rochman et al., 2016) cannot be clearly defined. It can be interpreted that suffering or death of individual animals constitutes harm, while another interpretation is that ‘large numbers’ of individuals must suffer or die to constitute harm, or even that populations must be in serious decline before they can be said to be harmed, including firm evidence that it is specifically marine litter that is responsible for the decline.
Indicator species under the MSFD should not be in decline before the indicator highlights harm. Species are selected as indicators owing to their abundance, which usually means they are also not considered under threat species. Other more vulnerable and/or threatened species (i.e. those on the IUCN Red List of Threatened Species) may become at risk of extinction due to marine litter even in a situation in which the indicator species such as northern fulmar is still abundant.
However, it is useful to note that despite two centuries of growth fulmar populations across Europe are currently stable or declining (Figure e). The OSPAR common indicator on marine bird abundance highlights that in the Greater North Sea and Celtic Seas, the relative annual fulmar population for 2015 is less than 80% of that in the baseline year (1992) and has strongly decreased (by more than 5%) in the last year. In Europe, the fulmar population is estimated to have declined by more than 40% since about the mid-1980s, and has been red-listed by BirdLife International as ‘Endangered’ based on standard IUCN Criteria. Within the EU, the fulmar population has the status ‘Threatened’. In most other, more distant areas, population trends are poorly known (Birdlife International, 2015). Conservation actions proposed in the BirdLife population assessment include: identification and protection of important sites at sea, as well as for prey species; continued monitoring of marine litter ingestion; and increased efforts for the removal of plastic from oceans (Birdlife International, 2015). Although firm evidence for the cause(s) of decline is impossible to obtain, ingestion of plastic debris is considered an ongoing threat to the fulmar population that needs to be addressed. In this respect, it is important to consider that the fulmar is a single indicator species and that to fully understand the impacts of plastic debris on the marine ecosystem further development of other indicator species is recommended.
Globally, it has been estimated that 80% of marine plastic debris originates from land (Faris and Hart, 1994). However, although huge masses of plastics are estimated to enter the sea from land-based sources (Jambeck et al., 2015) similar estimates for sea-based litter are lacking. In the North Sea, at least for macro-debris on beaches, sea-based activities (shipping, fisheries, aquaculture, offshore industry) are thought to be a major source (van Franeker, 2005; Fleet et al., 2009). Sources of smaller marine plastic debris in the North Sea are less clear. All (collective) measures in the OSPAR Regional Action Plan are expected to contribute to a reduction in floating litter and thus to a reduction in smaller debris ingested by fulmars.
The OSPAR Common Indicator on Plastic Particles in Fulmar Stomachs aims to reflect litter floating at the surface, and the potential harm from marine litter in the North Sea environment to pelagic (open sea) marine organisms. However, the fulmar monitoring effort does not give direct information on ‘harm’ or ‘damage’ but simply quantifies spatial and temporal patterns in abundance of plastics in fulmar stomachs as an indirect measure of harm. Dedicated experimental laboratory-based research into evidence of harm to fulmars from specified levels and types of plastics, as a specific example of harm, is urgently needed to strengthen the role of this OSPAR Common Indicator.
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D10 - Marine Litter
|Context (4)||D10.1 - Characteristics of litter in the marine and coastal environment, D10.2 - Impacts of litter on marine life|
|Point of contact|
SNS Fulmar Study Group, Dr. J.A. van Franeker
Monitoring of plastic particles in stomachs of fulmars in the North Sea area
Plastic debris ingested by seabirds is used to monitor man-made marine litter and provides a proxy of harm to wildlife. Without significant change over the past ten years, currently 58% of North Sea fulmars has more than 0.1 gram plastic in the stomach, where OSPAR aims at less than 10%.
|Indirect spatial reference|
BE, DE, DK, FR, NL, NO, UK
|Conditions applying to access and use||http://www.ospar.org/site/assets/files/1215/ospar_data_conditions_of_use.pdf|
|Conditions applying to access and use|
Major parts of data collection for this assessment have been a non-funded effort by volunteer groups as well as professionals. They kindly request that within 5 years of the End-date of the assessment, usage of raw data for formal reports and scientific articles is not done without consultation of the groups point of contact as given above.