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Long-term survival of human faecal microorganisms on the Antarctic Peninsula


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Abstract: Human faecal waste has been discarded at inland Antarctic sites for over 100 years, but little is known about the long-term survival of faecal microorganisms in the Antarctic terrestrial environment or the environmental impact. This study identified viable faecal microorganisms in 30–40 year old human faeces sampled from the waste dump at Fossil Bluff Field Station, Alexander Island, Antarctic Peninsula. Viable aerobic and anaerobic bacteria were predominantly spore-forming varieties (Bacillus and Clostridium spp.). Faecal coliform bacteria were not detected, indicating that they are less able to survive Antarctic environmental conditions than spore-forming bacteria. In recent years, regional warming around the Antarctic Peninsula has caused a decrease in permanent snow cover around nunataks and coastal regions. As a result, previously buried toilet pits, depots and food dumps are now melting out and Antarctic Treaty Parties face the legacy of waste dumped in the Antarctic terrestrial environment by earlier expeditions. Previous faecal waste disposal on land may now start to produce detectable environmental pollution as well as potential health and scientific problems.
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Since the first human exploration of coastal Antarctica at
the end of the 19th century, disposal of faecal waste has
generally been into the sea (Meyer et al. 1963, McFeters
et al. 1993, Hughes 2003, Hughes & Blenkharn 2003). With
exploration inland, this method is not practical and most
human waste has been left in situ, either buried in snow
(Parker & Martel 2002) or discharged to inland streams and
lakes. Burial of human waste in ice pits is still common
practice for inland research stations, situated on ice shelves
or the polar plateau, and for both static and travelling field
parties. Once buried and maintained at low temperatures,
faecal waste in Antarctica undergoes relatively little
degradation and could become a long-term pollution
problem (Parker & Martell 2002).
The British Antarctic Survey (BAS) Fossil Bluff Field
Station is situated on Alexander Island beside George VI Ice
Shelf (Fig. 1). The base was constructed in February 1961
and occupied in the winters of 1961, 1962 and 1969–75,
after which time it has been operated as a summer-only
station. During the 1960s, all rubbish generated at Fossil
Bluff was deposited at a waste dump on the surface of the
ice shelf. After 40 years, the dump has remained on the
surface of the ice shelf and has not been buried by snow. It
was removed completely in 2003. Until recently, toilet
facilities at Fossil Bluff Field Station were primitive.
Initially, faeces were excreted directly into empty flour tins
and deposited on the dump. However, in the 1970s a
chemical toilet was installed and the waste was then
emptied into a nearby crevasse. Facilities to dispose of
human faecal waste were significantly improved in 2000
when BAS installed a propane-fuelled incinerating toilet at
the base.
This paper examined 30–40 year old human faecal waste
found at Fossil Bluff dump to determine the long-term
survival of faecal microorganisms in the Antarctic
Materials and methods
Air temperature at Fossil Bluff Field Station was measured
every 6 h between January 1999 and December 2002 using
a platinum resistance thermometer (accuracy ±0.06°C; RS
Components, Corby, UK).
In February 2000, sealed flour tins containing faecal
material, and snow and ice from around the Fossil Bluff
waste dump were collected aseptically. Samples were
placed in insulated containers and flown to Rothera
Research Station (~ 1.5 h) for immediate analysis. During
the collection period the air temperature at Fossil Bluff was
+2°C. Other flour tins, opened at the site, revealed that at
that time the faecal material was unfrozen.
Faecal coliforms in melted snow (c. 1 l; melted overnight
at +4°C) were enumerated in triplicate using membrane
Antarctic Science 16 (3): 293–297 (2004) © Antarctic Science Ltd Printed in the UK DOI: 10.1017/S095410200400210X
Long-term survival of human faecal microorganisms on the
Antarctic Peninsula
1British Antarctic Survey, NERC, High Cross, Madingley Road, Cambridge CB3 0ET, UK
2Department of Microbiology, Plymouth Hospitals NHS Trust, Derriford Hospital, Plymouth PL6 8DH, UK
* Corresponding author:
Abstract: Human faecal waste has been discarded at inland Antarctic sites for over 100 years, but little is
known about the long-term survival of faecal microorganisms in the Antarctic terrestrial environment or the
environmental impact. This study identified viable faecal microorganisms in 30–40 year old human faeces
sampled from the waste dump at Fossil Bluff Field Station, Alexander Island, Antarctic Peninsula. Viable
aerobic and anaerobic bacteria were predominantly spore-forming varieties (Bacillus and Clostridium spp.).
Faecal coliform bacteria were not detected, indicating that they are less able to survive Antarctic
environmental conditions than spore-forming bacteria. In recent years, regional warming around the
Antarctic Peninsula has caused a decrease in permanent snow cover around nunataks and coastal regions. As
a result, previously buried toilet pits, depots and food dumps are now melting out and Antarctic Treaty
Parties face the legacy of waste dumped in the Antarctic terrestrial environment by earlier expeditions.
Previous faecal waste disposal on land may now start to produce detectable environmental pollution as well
as potential health and scientific problems.
Received 18 August 2003, accepted 26 April 2004
Key words: Antarctica, climate change, Environmental Protocol, faecal bacteria, faecal coliforms, freezing Downloaded: 11 Dec 2013 IP address:
filtration (0.2 µm, Sartorius, Goettinger, Germany) on
membrane lauryl sulphate broth agar (MLSB; Oxoid,
Basingstoke, UK) according to established procedures
(Anon 1994). Immediately after opening the flour tins,
faecal samples (~1 g) were extracted from the centre of the
unfrozen mass under aseptic conditions, suspended in
300 ml of phosphate buffered saline (PBS; pH 7.2) and the
supernatant filtered as before to enumerate faecal coliforms.
The remaining flour tins were stored at -20°C and frozen
samples were transported to Derriford Hospital, Plymouth,
UK, for further microbiological analysis. Representative
portions of the faecal material were treated as described in
Table I, to culture a range of faecal bacteria (Public Health
Laboratory Service 1998a, 1998b, Roberts et al. 1995).
Examination for intestinal parasites was performed by
direct microscopic examination, and by the formol-ethyl
acetate concentration method (Public Health Laboratory
Service 1998c).
Fossil Bluff experiences low precipitation and temperatures
and has been characterised as having a continental rather
than maritime climate (Harangozo et al. 1997). However,
Fossil Bluff experiences mean summer temperatures
(December–February) close to 0°C (Fig. 2) with regular
daily positive maxima, and is likely to experience higher
numbers of freeze/thaw events than at colder sites at higher
Faecal material sampled from the dump was not in a
frozen state upon collection indicating that this material
may have undergone repeated cycles of freeze/thaw over
the last 30–40 years. Preliminary microbiological
examination at Rothera Research Station of faecal material
and snow collected around Fossil Bluff dump did not reveal
the presence of viable faecal coliforms. The results of more
extensive microbiological examination of the faecal
material following freezing and transport to the UK are
shown in Table II. As shown initially, no coliforms were
isolated although these are normally common in faecal
material. Aerobic bacteria included Bacillus spp.
(B. pumilus, B. subtilis, B. licheniformis and B. sphaericus),
Aerococcus spp., Micrococcus spp. and Corynebacterium
spp. Viable alpha haemolytic Streptococci were also found.
Coliforms were not detected while Enterococci were
cultured in low numbers from only one sample [~1 ×102
colony forming units (cfu) g-1]. Anaerobic bacteria cultured
included Clostridium perfringens, which is a common
marker strain indicative of faecal contamination. Ova, cysts
and parasites were not seen in the faecal material.
Fig, 1. Map of Fossil Bluff Field Station, showing the field station
and dump site.
Fig. 2. Air temperature data recorded at Fossil Bluff Research
Station. Plots represent mean (; ±SD), maximum () and
minimum () monthly values over the period January
1999–December 2002. Downloaded: 11 Dec 2013 IP address:
This study has shown that faecal Enterococci and spore-
forming Bacillus and Clostridium species can survive in the
climatic conditions of the Antarctica Peninsula for 30–40
years. Under both aerobic and anaerobic conditions,
cultured bacteria were predominantly spore-forming
species, i.e. Bacillus spp. or C. perfringens. Gram negative
coliform bacteria were not cultured from the material, and
have been shown previously to be particularly susceptible to
damage by freeze-thaw stress (Parker & Martel 2002). Our
data are in agreement with work carried out by Meyer et al.
(1963) who examined human faecal material produced in
the first decade of the last century (50 years previously) by
Scott and Shackleton’s expeditions at McMurdo Sound,
continental Antarctica. They cultured Clostridium spp. and
Bacillus spp., but found no evidence of Escherichia coli or
other coliform bacteria. Nedwell et al. (1994) quantified
faecal bacteria in pony dung found at Scott’s camps at Cape
Evans dating from around the same period (1910–11). With
aerobic culture on Casein Peptone Starch Agar they found
Table I. Culture techniques for identification of faecal microorganisms.
Microorganism Growth medium Culture conditions: Enrichment and identification
oxygen, duration, temperature
aerobic colony count1Columbia blood agar aerobic, 44 h, 37°C Direct plating
Bacillus spp.1Polymyxin egg yolk mannite aerobic, 44 h, 37°C Bacillus spp. and other aerobic Gram positive
Bromothymol blue agar bacteria were identified using BBL Crystal
Gram Positive Identification System (Becton
Dickenson Ltd, Oxford)
anaerobic colony count1Fastidious anaerobic agar anaerobic, 44 h, 37°C Direct plating
Clostridium spp.2Fastidious anaerobic agar with neomycin anaerobic, 44 h, 37°C Direct plating
Clostridium perfringens2Perfringens TSC agar anaerobic, 44 h, 37°C Clostridium perfringens confirmed using API
Rapid 32A Identification System (Biomerieux
Ltd, Hampshire, UK)
Enterococci 1Azide dextrose broth by most probable aerobic, 44 h, 37°C Confirmation onto Kanamycin aesculin azide
number technique (MPN) agar, aerobic, 22 h, 44°C
coliform bacilli and Most probable number technique (MPN) aerobic, 44 h, 37°C
Escherichia coli (non-O157)1in minerals modified glutamate broth
Salmonella spp., Shigella spp.2Xylose lysine desoxycholate agar and aerobic, 22 h, 37°C Enrichment for Salmonella spp. in single
Hynes desoxycholate citrate agar strength selenite F broth, aerobic, 37°C, 24 h
Campylobacter spp.3Cefoperazone charcoal desoxycholate agar micro-aerophilic, Enrichment in Campylobacter broth, aerobic,
90 h, 42°C 37°C, 24 h
Escherichia coli 01572Cefixime-tellurite sorbitol MacConkey agar aerobic, 22 h, 37°C Direct plating
Vibrio spp.2Thiosulphate citrate bile sucrose agar aerobic, 22 h, 37°C Direct plating
Staphylococcus aureus2Baird Parker agar aerobic, 44 h, 37°C Direct plating
1Roberts et al. 1995 2Public Health Laboratory Services 1998a 3Public Health Laboratory Services 1998b
Table II. Counts of bacteria within Fossil Bluff dump faecal material
Microorganisms Sample Number
12 34 5
aerobic bacteria (cfu g-1) 4.8 ×1032.4 ×1077.5 ×1051.8 ×1045.0 ×106
Bacillus spp. (cfu g-1)+
a1.1 ×1031.2 ×1037.0 ×1021.0 ×102
anaerobic bacteria (cfu g-1) 6.0 ×1062.2 ×1053.2 ×1056.0 ×1046.0 ×105
Clostridium perfringens (cfu g-1)+
a1.7 ×1051.2 ×1022.5 ×1045.0 ×101
Enterococci (cfu g-1) 1.4 ×102nd nd nd nd
Coliform bacilli and Escherichia coli (non-0157) nd nd nd nd nd
Salmonella spp. (cfu 50 g-1)ndndndndnd
Shigella spp. (cfu 25 g-1)ndndndndnd
Campylobacter spp. (cfu 50 g-1)ndndndndnd
Escherichia coli 0157 (cfu 25 g-1)ndndndndnd
Vibrio spp. (cfu g-1)ndndndndnd
Staphylococcus aureus (cfu g-1)ndndndndnd
nd: not detected apresent in sample but not enumerated Downloaded: 11 Dec 2013 IP address:
up to 1.9 ×106cfu g-1 pony dung, which upon further
examination were mainly Bacillus spp. Taking the data of
Meyer et al. into consideration, Nedwell et al. concluded
that coliforms can survive < 50 years and sporing bacteria
> 80 years in a continuously frozen state in Antarctica. From
our study, we can reduce the survival time of coliforms to
< 30 years and confirm the survival of sporing bacteria to be
> 30 years in the Antarctic Peninsula. Survival of aerobic
bacteria in 30–40 year old human faecal material from
Fossil Bluff ranged from 4.8 ×103to 2.4 ×107cfu g-1 [mean
= 6.0 ×106 (S.E. ±4.6 ×106)]. The mean value is lower than
found previously in older, though continuously frozen,
faecal material from McMurdo (2 ×107cfu g–1; 50 years
old) (Meyer et al. 1963). This difference may be a
consequence of the greater number of fluctuations around
freezing point experienced at Fossil Bluff compared to
McMurdo Sound (Harangozo et al. 1997, S. Colwell,
personal communication 2003), leading to increased
freeze/thaw damage to cells (Sanin et al. 1994, Parker et al.
2000) (Fig. 2). The finding that the faecal material at Fossil
Bluff was not frozen when initially collected from the dump
may corroborate this.
Bacillus spp. were found in Antarctic faecal material
examined by Meyer et al. (1963), Nedwell et al. (1994) and
in this study. However, Bacillus spp. are common
environmental isolates and despite careful sampling
protocols, may have come from other sources.
With the application of molecular biological techniques it
is now possible to detect DNA from human faecal
microorganisms in supposedly pristine Antarctic soils. For
example, Sjoling & Cowan (2000) found residual levels of
non-indigenous bacteria at abandoned Antarctic field camps
using PCR amplification of extracted soil DNA, though
Upton et al. (1997) failed to detect human commensals
using PCR around Halley Bay Research Station. Baker
et al. (2003) list a number of PCR primers for specific
microbial species, which could be used in pristine
environments to detect microorganisms indicative of human
impact. Whilst a major methodological advance, this
technique does not indicate whether the microorganisms are
viable, for which we have to rely on traditional culture
techniques for the foreseeable future.
Impact of regional climate change
Antarctic Treaty Parties face the legacy of waste dumped in
the Antarctic terrestrial environment by earlier expeditions.
Previous methods of human waste disposal on land are now
starting to produce detectable but localized environmental
pollution as well as potential health and scientific problems.
In some areas of the Antarctic Peninsula, regional warming
has caused a decrease in permanent snow cover around
nunataks and coastal regions (Fox & Cooper 1998) with the
result that previously buried toilet pits, depots and food
dumps are now melting out. At Sky Hi Nunataks
(P. Convey, personal communication 2003) and Witte
Nunataks (southern Antarctic Peninsula; M. Hunter,
personal communication 2003), faecal material was
encountered in 2001 by BAS field parties that may have
been derived from either dogs or humans in travelling
geological field parties dating back to the 1970s. Also,
buried faecal material on glacier surfaces are now being
rediscovered due to reduced annual snow accumulation, and
increased surface melt and ablation. For example, the
surface lowering of the ice ramp at Rothera Point, which
Smith et al. (1999) attributed to regional climate change,
has resulted in dog faeces (dating from before February
1994) coming to the surface through ice melt (Hughes,
personal observation 2001). As well having health and
safety implications, buried faecal material can cause other
practical problems: in January 2001 a BAS Twin Otter
aircraft, upon landing at Utopia Glacier, Alexander Island,
caught one of its skis in an unmarked old toilet pit that had
become partially exposed (Hughes, personal observation
Science implications
Scientists must select carefully their study sites to avoid
areas of previous human impact. Unfortunately, these sites
are often only poorly mapped, especially in remote field
locations and on the polar plateau. In the early 1970s, BAS
glaciologists working on the George VI Ice Shelf drilled an
ice core through some dog faeces left by an earlier
expedition (D. Peel, personal communication 2003). At
sites of unique scientific importance, the cumulative impact
of scientists working in the same place for many seasons
can have significant consequences. For example, ten
persons working for three summer seasons would produce
over 1000 kg of faecal waste. Under Annex III (waste
disposal and waste management) of the Environmental
Protocol the Treaty nations are required to ‘prepare an
inventory of locations of past activities (such as traverses,
fuel depots, field bases, crashed aircraft) as far as is
practicable, before the information is lost, so that such
locations can be taken into account in planning future
scientific programmes (such as snow chemistry, pollutants
in lichens, ice core drilling)’. However, even if adequately
carried out today, this does not provide information on the
burial of faecal waste over the past 100 years.
This study has shown that faecal Enterococci and spore-
forming aerobes and anaerobes present in 30–40 year old
human faeces have survived the climatic conditions of the
Antarctic Peninsula, including repeated freeze-thaw cycles.
Increased rates of snow and ice melt, possibly associated
with regional climate change, have resulted in previously
buried faecal material becoming exposed. Effective
296 KEVIN A. HUGHES& SIMON J. NOBBS Downloaded: 11 Dec 2013 IP address:
implementation of the requirements of the Environmental
Protocol is therefore needed, as well as research and
development of alternative methods of human waste
disposal in inland areas of Antarctica.
Annex III of the Protocol on Environmental Protection to
the Antarctic Treaty (1991) requires that existing Antarctic
waste disposal sites are cleaned up. In the summer of
2002–03, BAS completely removed the waste dump at
Fossil Bluff (approximately 52 tonnes of waste) by Twin
Otter aircraft to Rothera Research Station, after which it
was transported by sea for recycling or safe disposal either
in the Falkland Islands or the United Kingdom (Plato 2001).
The results from this study were used to implement correct
and safe working practices for the removal of the faecal
material from the dump site: personnel were provided with
disposable safety clothing and washing facilities, and all
material associated with faecal material was treated as
biohazard waste.
This work was supported by the British Antarctic Survey’s
‘Biomolecular Responses to Environmental Stresses in the
Antarctic’ project and the Environment and Information
We thank Nigel Blenkharn for help with sample
collection, Steve Colwell for meteorological data and Pete
Marquis for logistical assistance. M. Hunter, D. Peel and R.
Mulvaney are thanked for historical information. P. Fretwell
is acknowledged for map preparation and Drs P. Convey
and J. Shears for comments on the manuscript. We thank the
referees, D. Cowan, D. Nedwell and L. Parker, for their
constructive help.
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Seabirds and pinnipeds play an important role in biogeochemical cycling by transferring nutrients from aquatic to terrestrial environments. Indeed, soils rich in animal depositions have generally high organic carbon, nitrogen and phosphorus contents. Several studies have assessed bacterial diversity in Antarctic soils influenced by marine animals; however most have been conducted in areas with significant human impact. Thus, we chose Cape Shirreff, Livingston Island, an Antarctic Specially Protected Area designated mainly to protect the diversity of marine vertebrate fauna, and selected sampling sites with different types of animals coexisting in a relatively small space, and where human presence and impact are negligible. Using 16S rRNA gene analyses through massive sequencing, we assessed the influence of animal concentrations, via their modification of edaphic characteristics, on soil bacterial diversity and composition. The nutrient composition of soils impacted by Antarctic fur seals and kelp gulls was more similar to that of control soils (i.e. soils without visible presence of plants or animals), which may be due to the more active behaviour of these marine animals compared to other species. Conversely, the soils from concentrations of southern elephant seals and penguins showed greater differences in soil nutrients compared to the control. In agreement with this, the bacterial communities of the soils associated with these animals were most different from those of the control soils, with the soils of penguin colonies also possessing the lowest bacterial diversity. However, all the soils influenced by the presence of marine animals were dominated by bacteria belonging to Gammaproteobacteria, particularly those of the genus Rhodanobacter. Therefore, we conclude that the modification of soil nutrient composition by marine vertebrates promotes specific groups of bacteria, which could play an important role in the recycling of nutrients in terrestrial Antarctic ecosystems.
... and Bacillus spp. were viable after 30 years on the Antarctic Peninsula, while fecal coliforms lost their viability rapidly under the same conditions (Hughes and Nobbs 2004). Thus, spore-forming Bacilli have advantages for long-term survival and transportation over long distances. ...
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Mercury-resistant (HgR) bacteria occur in various bacterial species from a wide variety of environmental sources. Resistance is conferred by a set of operon genes termed the mer operon. Many HgR bacteria have been isolated from diverse environments and clinical samples, and it is recognized that mer operons are often localized on transposons. Previous research reports have suggested that HgR transposons participate in the horizontal gene transfer of mer operons among bacteria. This was confirmed by a study that found that mer operons were distributed worldwide in Bacilli with dissemination of TnMERI1-like transposons. In this mini review, possible strategies for transposon-mediated in situ molecular breeding (ISMoB) of HgR bacteria in their natural habitat are discussed. In ISMoB, the target microorganisms for breeding are indigenous bacteria that are not HgR but that are dominant and robust in their respective environments. Additionally, we propose a new concept of bioremediation technology for environmental mercury pollution by applying transposon-mediated ISMoB for environmental mercury pollution control.
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Purpose: More than 150 lakes on different peninsulas and islands are situated in the Larsemann Hills. The Larsemann Hills are an ice-free area and are located halfway between the Vestfold Hills and the Amery Ice Shelf on the south-eastern coast of Prydz Bay, Princess Elizabeth Land, East Antarctica. Antarctic lakes water is being polluted due to anthropogenic activities caused by various research activities and tourism. Methods: During 34th Indian Scientific Expedition to Antarctica (ISEA) in 2014 to 2015, twenty lake water samples in triplicates were collected from the Broknes & Grovnes peninsula. Coliform and faecal coliform bacteria were analyzed in these samples. Results: Out of twenty, eleven lake water samples were found to be contaminated with coliform bacteria. However, faecal coliform bacteria were absent in all the lake water samples. Coliforms are found in the lakes of Broknes peninsula (P2 Lake & P3 Lake) and Grovnes peninsula (L1C NG, L1D NG, L1E NG, L7 NG, L7A NG, L7B NG, L2 SG, L4 SG & L5 SG). Conclusion: The present study confirms the presence of coliform bacteria in the lakes of East Antarctica which indicates an alarming situation and needs to be investigated further.
The increasing knowledge and awareness concerning the presence of pharmaceutical residues and their negative impact on the marine environment create a need to develop new tools to investigate and monitor their pathways. Multiresidue methods allow the determination of a vast number of target compounds from different classes of pharmaceuticals in a single analysis. The application of these methods to seawater samples is more complicated compared with freshwater analysis due to matrix impact and dilution of the target compounds. This chapter presents a review of the published research papers from the last decade and discusses the analytical methodologies presented there. Based on the current knowledge, authors also try to predict and point out the future trends and challenges in multiresidue analysis methodology.
The occurrence of the so-called contaminants of emerging concern (CoEC) are a topic of global interest due to the following factors: their continuous discharge into environment, the increasing number of new compounds added each year to this list, and the unknown potential effects they may cause to aquatic and terrestrial organisms. It is possible that the pharmaceuticals reach the Antarctic continent, traveling long distances from populated zones in the southern hemisphere. However, discharge of untreated and poorly treated wastewater from scientific stations located in the white continent, along with tourism seem to be the most plausible sources of these pollutants. Even though Antarctica is barely populated, pharmaceutical residues can be found in the seawater and in the coast of the continent and the surrounding islands. This is a major concern, since the tough weather conditions, together with the lack of sunlight irradiation for 6 months, hinder the biotic and abiotic degradation process that normally reduce the concentration of these trace pollutants. Pharmaceutical residues have been found either in effluents from wastewater treatment plants and the seawater from the Antarctic coast, unveiling the lack of efficiency of the wastewater treatment processes installed in human settlements and warning the threat that aquatic organisms face in this fragile ecosystem. This chapter explores the point and diffuse sources of pharmaceuticals—and other CoEC—in Antarctica, highlighting the hot spots in the South Shetland Islands, the Antarctic Peninsula, and the Ross Sea. The urgency of treating wastewater efficiently is highlighted, while advanced treatment systems are put on the table as an alternative to reduce the discharge of pharmaceutical residues in the Antarctic sea.
The types and distributions of anthropogenic rubbish have been documented at Bunger Hills, East Antarctica. The area has been the site of scientific research stations from 1958 to the present. Rubbish types include deliberately or negligently discarded items (gas cylinders, broken glass), abandoned unserviceable equipment (boats, vehicles, scientific equipment), spills (chemicals, fuel, oil) and the slow collapse of old buildings. Some rubbish remained where it was left, while other material was redistributed by strong winds. Modern expeditioner training should limit the production of new rubbish, while inadvertent wind dispersal of rubbish from old station buildings could be minimized by better management of these structures and their surrounds. Buildings and other constructed items need ongoing maintenance if they are not to break down and be distributed by wind, or they should be removed within a reasonable period.
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Level-line surveys at a number of sites on the Antarctic Peninsula since the early 1970s have shown a lowering of the ice surface elevation in areas where the climate is warm enough for melting to occur during summer. Results are presented here from annual surveys on the ice ramp at Rothera Point. Over an 8 year period, a large proportion of the ramp shows a generally steady reduction in surface elevation. The uppermost part of the ramp shows no clear trend. The ice ramp has suffered a mean rate of surface lowering of 0.32 m a-1 w.e. over the period of the surveys, which is similar to that seen at other sites on the Antarctic Peninsula. Measured ice velocities on the ramp are low, so the surface lowering can be attributed directly to changes in surface mass balance. The surveys coincide with a period of long-term increase in temperature and ablation seen in meteorological records. Comparison of the observed surface lowering with temperature data shows a good agreement, and we conclude that increasing air temperatures in the region will raise ablation and increase the recession rate of the ice ramp.
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Aerial photography has been used as a mapping tool in the Antarctic Peninsula region since the late 1920s. Following pioneering work by Wilkins in 1928, Ellsworth in 1934 and the British Graham Land Expedition in 1934-37, the Falkland Islands and Dependencies Aerial Survey Expedition carried out extensive aerial photography during the period 1955-57. Since then, many other aerial surveys have been carried out, and the result is an archive of aerial photography that, for some localities, spans 40 years. The production of maps both from different generations of photographs and satellite images has revealed many changes in the extent of ice cover with time. For example, changes in ice shelves such as the Wordie Ice Shelf, Larsen Ice Shelf and Muller Ice Shelf, are well recorded, and the termini of some glaciers have retreated. However, the most pervasive change is the consistent decline in the extent of small bodies of snow and ice. This paper shows how perennial snow or ice cover has decreased in the northern Marguerite Bay area, at 68°S. The correlation of the change with elevation and with climate records from Adelaide and Rothera research stations in the Antarctic Peninsula region is examined.
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Plate counts were made of bacteria surviving in materials from Shackleton's and Scott's camps from the first decade of this century. Several millions of bacteria per g of material were detected in samples of pony dung and lesser numbers in dried peas, pearl barley, chaff and straw. No coliforms had survived in the dung: apparent positives in the presumptive coliform counts proved to be sporing Bacillus spp. when tested in a confirmatory coliform test. Subsamples of the colonies growing on agar plates all proved to be either Bacillus spp. producing endospores or actinomycetes (Micromonospora spp.) with single spores along the hyphae.
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Human contamination of Antarctic environments is a sensitive issue and has been the focus of many research articles over the past 35 years. The majority of these studies have targeted waste materials and various hydrocarbons, with assessment of microbial contaminants being largely restricted to sewage outfalls. The present study aimed to detect bacteria of human origin in the area surrounding Halley research station. It was apparent from both molecular and culture methods that bacteria of human origin are extremely difficult to detect outside the immediate surrounding of the buildings, though recommendations are made for increasing the probability of determining the presence of organisms in the environment. The results also indicate that molecular methods are more sensitive than cultural techniques, in that the only evidence for organisms in the environment surrounding the buildings came from positive PCR reactions. PCR would appear to be a useful method for studying the microbial ecology of Antarctic environments.
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The presence of non-indigenous microbial contaminants resulting from human faecal contamination of old and currently occupied base and field camp sites in South Victoria Land, Antarctica, was assessed by PCR amplification of extracted soil DNA using species-specific PCR primers. Positive controls (samples recovered from the environs of Scott Base, including the sewage outfall) gave strong signals with Escherichia coli primers whereas Clostridium clostridiiforme primers yielded a signal only with the sewage outfall sample. A comparison was made of PCR amplification results from samples from the abandoned Canada Glacier camp site, the Lake Fryxell summer camp site, the Cape Bird Adelie penguin colony and pristine sites from relatively inaccessible regions of the Taylor Valley. Results indicated a possible residual level of E. coli contamination in the abandoned Canada Glacier camp site, but no significant contamination of the currently occupied Lake Fryxell camp site. These data may provide indirect evidence for improved awareness and standards of waste handling and disposal over the past two decades of Dry Valley field research.
An analysis of a long-term surface air temperature record for Fossil Bluff in the George VI Sound, West Antarctic Peninsula (WAP) documents in detail some important aspects of the climate of this area for the first time. The analysis identifies the close dependency of air temperatures on latitude in the WAP but reveals that the strength of this dependency is greatest in winter. This result along with others leads to the Fossil Bluff climate regime being characterized as rather than as found further north. The WAP as a whole displays large interannual temperature variability but this is greatest in Marguerite Bay rather than the Fossil Bluff area. Evidence is also provided for secular climatic change appearing in summer throughout the WAP over the last few decades. The representativeness of existing Antarctic Peninsula annual air temperature climatologies, based mainly on snow temperature measurements, for the winter and summer periods is also noted.
Microbiological studies of continuously frozen human feces and foodstuffs from sites of early Antarctic expeditions revealed viable organisms after 50 years. Aerobic and anaerobic sporeforming and non-sporeforming bacteria, actinomycetes, yeasts, and molds were recovered. No coliforms were encountered, and other enteric bacteria were of low incidence. The survival of microbiota expected to be present only as a minor component indicates that these have retained sufficient viability so as to comprise the major component of the populations.
Microorganisms that are found in domestic wastewater and that can cause illness in humans include bacteria viruses protozoan cysts and helminth ova. This literature review attempts to determine whether organisms contained in a frozen sewage bulb in the Antarctic ice would survive for decades. This review briefly examines the structural differences between these organisms; examines the susceptibility of these organisms to chilling freezing thawing and frozen storage and the effect these processes have on the structural components of the organisms; and compares findings from field studies including some archeo-logical studies on the ability of these organisms to withstand natural cold environments.
This study examined the effects of a patented wastewater treatment process that makes snow from secondary wastewater, and the subsequent freeze-thaw cycling processes that occur in a snow column, on bacterial survival. Coliform bacteria were observed to be the most adversely affected by snowmaking, with more than a 3-log reduction in the total coliform counts and more than a 2-log reduction in the fecal coliform counts. Other species of bacteria were less affected by snowmaking, especially the gram-positive, fecal streptococci. Many species of bacteria also survived the multiple freeze-thaw cycles in the snow column and replicated during melting.