EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > SPECIES/POPULATION INTERACTIONS > RANGE CHANGES
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The populations of fur seals on Australia's two subantarctic islands were exterminated by uncontrolled sealing in the 19th century. Only in the latter half of the 20th century have populations commenced recovering. This project provides key information on the status and trends of recovering fur seal populations in the Southern Ocean, including information on the distribution of foraging effort, food and energy requirements, oceanographic determinants of demographic performance, ecological interactions with commercial fisheries, the extent, trends, processes and implications of hybridisation at Macquarie Island, and the status and trends in numbers of the threatened subantarctic fur seal. This dataset represents ARGOS tracking data of fur seals from Macquarie Island during 1997-1999. The tracking data are comprised of 28 data profiles. Taken from the abstract of the referenced paper: Antarctic Arctocephalus gazella and subantarctic Arctocephalus tropicalis fur seals breed sympatrically at Macquarie Island. The two species have different lactation strategies, the former rearing its pup in 4 months and the latter taking 10 months. The diet and at-sea foraging behaviour of these sympatric species was compared during the austral summer period when their pup rearing period overlapped. The prey of the two fur seal species was very similar, with fish dominating the diet. Themyctophid, Electrona subaspera, was the main prey item (93.9%) in all months of the study. There were no major differences in the diving behaviour between species. Both species foraged north of the island parallel to the Macquarie Ridge. Foraging activity was concentrated at two sites: (i) within 30 km north of the island; and (ii) at 60 km north. Most locations for overnight foraging trips were within 10 km of the colonies. The different lactation strategies of A. gazella and A. tropicalis allowed for flexibility in foraging behaviour. At Macquarie Island, the local marine environmental conditions have resulted in similar foraging behaviour for both species.
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This indicator is no longer maintained, and is considered OBSOLETE. INDICATOR DEFINITION The size of the breeding population of King Penguins at Heard Island. TYPE OF INDICATOR There are three types of indicators used in this report: 1. Describes the CONDITION of important elements of a system; 2. Show the extent of the major PRESSURES exerted on a system; 3. Determine RESPONSES to either condition or changes in the condition of a system. This indicator is one of: CONDITION RATIONALE FOR INDICATOR SELECTION The breeding population of King Penguins is related to resource availability (nesting space and food), behavioural mechanisms (immigration/emigration and breeding effort/success) in addition to climate change and human impacts such as fisheries. Monitoring breeding population and interpretation of the data provides information on changes in the Subantarctic ecosystem. DESIGN AND STRATEGY FOR INDICATOR MONITORING PROGRAM Spatial scale: Heard Island (lat 53 deg 06' 00.0" S, long 73 deg 31' 59.9" E). Frequency: 2-3 years. Access to remote colonies and other logistical constraints do not permit annual visits. Measurement technique: Each colony is visited and individual birds are counted from the ground by two or three personnel performing replicate counts. Further counts are obtained by oblique ground and aerial photography. All breeding individuals in a colony are counted. Considerations regarding disturbance associated with census visits are also incorporated into monitoring strategies. The lack of annual census data does not reduce the value of these long-term monitoring programmes. RESEARCH ISSUES The king penguin breeding population at Heard Island has increased at almost 20% per year since the late 1940s; other king penguin populations throughout the Southern Ocean have also increased, but not as rapidly. At present, there is no alternative hypothesis to that previously proposed, that these population increases are sustained by the enhanced availability of myctophids, the principal prey of king penguins (Woehler et al. 2001). LINKS TO OTHER INDICATORS
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Sixteen satellite tags were deployed on adult southern right whales. Six of these tags were deployed on adult southern right whales at the Auckland Islands (AI), New Zealand (50.5˚S 166.3˚E) between 24 July and 2 August 2009 and one tag was deployed on a sub-adult at Pirates Bay (PB), Tasmania (43.2˚S 147.9˚E) in October 2010. Nine tags were deployed on adult southern right whales at Head of the Bight (HOB), South Australia (31.5˚S 131.1˚E) on 6 and 7 September 2015. However, tag performance was highly variable. Three of the six tags deployed at the AI ceased transmitting before the individuals moved out of the winter aggregation area. No transmissions were received from a fourth tag until 39 days after deployment at which point the whale was south of Western Australia and although the tag transmitted for 22 days, there was insufficient data to interpolate a track suitable to be included in analyses. Of the nine tags deployed at HOB, three tags failed to transmit, and three tags ceased transmitting within six days. Migratory movements from coastal calving grounds were successfully obtained for six individuals (AI=2, PB =1, HOB = 3) and detailed in the publication: Migratory movements of Southern right whales (Eubalaena australis) from Australia and New Zealand. This file includes the following data fields - PTT: the unique Argos identifier assigned to each satellite tag Datetime: the date and time in gmt with the format 'yyyy-mm-dd hh:mm:ss' Longitude Latitude Quality: the Argos assigned location class (see paper for details) Location: deployment location
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Distribution and abundance of breeding seabirds in the AAT. This dataset comprises a broad range of component datasets derived from ground surveys aerial photography and oblique photography. Aerial and oblique photography has been used to obtain supplementary information on distribution and abundance of seabirds in the region. Recent surveys, 2000/01 onwards, have made use of GPS for more precise geographic information on seabird nests and colonies. At present there are a number of child metadata records attached to this record. See the link above for details.
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This indicator is no longer maintained, and is considered OBSOLETE. INDICATOR DEFINITION Breeding populations of Adelie penguins at Davis, Mawson and Casey (including Shirley Island and Whitney Point). TYPE OF INDICATOR There are three types of indicators used in this report: 1. Describes the CONDITION of important elements of a system; 2. Show the extent of the major PRESSURES exerted on a system; 3. Determine RESPONSES to either condition or changes in the condition of a system. This indicator is one of: CONDITION RATIONALE FOR INDICATOR SELECTION The breeding population of Adelie penguins is related to resource availability (nesting space and food), behavioural mechanisms (immigration/emigration and breeding effort/success) in addition to climate change and human impacts (fisheries, tourism, pollution, disturbance). Monitoring these colonies and interpretation of the data provides information on changes in the Antarctic ecosystem. DESIGN AND STRATEGY FOR INDICATOR MONITORING PROGRAM Spatial scale: Colonies near Australian Stations - Casey (lat 66 deg 16' 54.5" S, long 110 deg 31' 39.4" E) Davis (lat 68 deg 34' 35.8" S, long 77 deg 58' 02.6" E) Mawson (lat 67 deg 36' 09.7" S, long 62 deg 52' 25.7" E) All colonies on - Shirley Island (lat 66 deg 16' 55.9" S, long 110 deg 29' 17.9" E) and Whitney Point (lat 66 deg 15' 08.6" S, long 110 deg 31' 40.1" E) Frequency: Annual surveys at Shirley Island and Whitney Point. Other colonies every 2-3 years, depending on logistical constraints. Measurement technique: Each colony is visited and all breeding birds are counted from the ground by two or three personnel performing replicate counts. Supplementary census data are obtained from oblique ground and aerial photographs. All breeding adults in a colony are counted. Considerations regarding disturbance associated with census visits are also incorporated into monitoring strategies. The lack of annual census data for some colonies does not reduce the value of these long-term monitoring programmes. RESEARCH ISSUES Adelie Penguin populations throughout East Antarctica have shown sustained, long-term increases for the past 30 or more years; in contrast, populations elsewhere around the Antarctic and on the Antarctic Peninsula have exhibited decreases or no clear long-term trends (Woehler et al. 2001). Greater coverage of colonies throughout the AAT would provide a more accurate estimate of the total annual breeding population in East Antarctica. In addition to basic inventory requirements, data on the population trends would contribute to a better understanding of the role of Adelie penguins in the Antarctic ecosystem, and provide managers with feedback or management strategies. LINKS TO OTHER INDICATORS
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This indicator is no longer maintained, and is considered OBSOLETE. INDICATOR DEFINITION The number of breeding pairs of Southern Giant Petrels at Heard Island, the McDonald Islands, and in colonies near Casey, Davis and Mawson stations. TYPE OF INDICATOR There are three types of indicators used in this report: 1. Describes the CONDITION of important elements of a system; 2. Show the extent of the major PRESSURES exerted on a system; 3. Determine RESPONSES to either condition or changes in the condition of a system. This indicator is one of: CONDITION RATIONALE FOR INDICATOR SELECTION The breeding population of Southern Giant Petrels is related to resource availability (nesting space and food), behavioural mechanisms (immigration/emigration and breeding effort/success) in addition to climate change and human impacts (including fisheries and human disturbance). Monitoring breeding populations and interpretation of the data provides information on changes in the Antarctic and Subantarctic ecosystems. DESIGN AND STRATEGY FOR INDICATOR MONITORING PROGRAM Spatial scale: Colonies near Australian Stations - Frazier Islands, Casey (lat 66 degrees 16' 54.5' S, long 110 degrees 31' 39.4' E) Hawker Island, Davis (lat 68 degrees 34' 35.8' S, long 77 degrees 58' 02.6' E) Giganteus Island, Mawson (lat 67 degrees 36' 09.7' S, long 62 degrees 52' 25.7' E) Heard Island - (lat 53 degrees 06' 00.0' S, long 73 degrees 31' 59.9' E) McDonald Islands - (lat 53 degrees 02' 26.2' S, long 72 degrees 36' 00.0' E) Frequency: Breeding Southern Giant Petrels are easily disturbed. Colonies are visited every 3-5 years to minimise disturbance to breeding birds. Measurement technique: All colonies are visited and breeding birds are counted from outside the colonies by two personnel performing replicate counts. All breeding individuals in a colony are counted. No birds are disturbed off their nests. Considerations regarding disturbance associated with census visits are also incorporated into monitoring strategies. The lack of annual census data does not reduce the value of these long-term monitoring programmes. RESEARCH ISSUES All Southern Giant Petrel breeding populations in the AAT and at HIMI decreased following their discovery. Southern Giant Petrels breeding on Indian Ocean islands are highly sensitive to human disturbance. Access to breeding colonies is restricted, as are the types of activities permitted. Disturbance from researchers has been implicated in the observed decreases in these populations (Woehler et al. 2001, Woehler et al. in press). Analyses of the long term AAT data suggest that the breeding populations at Hawker Is and at the Frazier Is have recovered following the restrictions on access and activities permitted on breeding islands. LINKS TO OTHER INDICATORS
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A major goal of a research expedition by the Australian Antarctic Division over the summer of (2003/04) in the Southern Ocean off Heard Island was to answer some of the questions needed to determine what level of exploitation of Southern Ocean fisheries is sustainable. The use of novel equipment, cutting edge technology and some adept logistical co-ordination allowed the Aurora Australis, on the Southern Ocean, to catch the prey of the predators of Heard Island. This work was accomplished by placing satellite trackers on animals at Heard Island, and then, using the ARGOS system, monitoring their activities in the Southern Ocean around the island. The Aurora Australis assisted in the monitoring and tracking of the animals by searching the areas the animals were foraging for prey species. The animals tracked in this experiment were: Light-mantled sooty albatrosses black-browed albatrosses king penguins macaroni penguins Antarctic fur seals The columns in this data file are: individual_id - the identifier of the individual animal species - the species name of that animal pttid - the identifier of the PTT tracker deployed on that animal deployment_longitude - the longitude at which the tracker was deployed deployment_latitude - the latitude at which the tracker was deployed observation_date - the date (ISO8601 format) of the position observation year, month, day, time, time_zone - as per the observation_date, but in separate columns locationclass - the ARGOS location class of the position (see http://www.argos-system.org/manual/3-location/34_location_classes.htm; value -3 corresponds to a "Z" class, value -2 to "B", value -1 to "A") latitude - the latitude of the position observation longitude - the longitude of the position observation
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Distribution and abundance of breeding seabirds at Heard I and the McDonald Is. This dataset comprises a broad range of component datasets derived from ground surveys aerial photography and oblique photography. Since the data have also been derived from old station logs for the 1947-54 period, and from published and unpublished records for the 1947-present day period. Aerial and oblique photography has been used to obtain supplementary information on distribution and abundance of seabirds in the region. Recent surveys, 2000/01 onwards, have made use of GPS for more precise geographic information on seabird nests and colonies. At present there are a number of child metadata records attached to this record. See the link above for details.
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---- Public Summary from Project ---- Leopard seals are usually seen in the pack-ice where they pup on the ice and where they must first face life at sea. However at Macquarie Island, well to the north of the ice, for 50 years now there has been the odd phenomenon of 'Leopard seal years'. At seemingly semi-regular periods (~3-4 years) considerable numbers (can be greater than 100) of leopard seals arrive at the island; and then virtually none are seen for some more years. The periodicity of these arrivals has been striking. Thus it seems that young leopard seals (which is the group arriving in poor condition on Macquarie Island) suffer acute food shortages in the pack-ice zone every 3-4 years. This project will continue to record these events and tag and weigh the seals which come ashore. This will allow the long-term dataset to continue and give some more information about the seals which arrive. It is also planned to glue some satellite recorders to the seals so that their journeys after M.I. can be known. Data are collected when seals are seen on beach. Since the 1980s few seals have been seen so data are sparse but significant. Currently the dataset contains the number of leopard seals sighted at Macquarie Island each year and a record of sightings of Leopard Seals from 1948 till 2002 (some years are omitted due to unavailability of data, see quality information). Details on the sightings include date and location of sighting and condition of the seal. The fields in the dataset for the number of seals sighted each year at Macquarie Island are: Year Number of seals. The fields in the dataset detailing the sightings of Leopard Seals on Macquarie Island from 1948 till 2002 include the following: Seal ID: Each seal has been allocated a unique ID number. This acts as a means of tracking the seal if a tag is replaced or removed. Tag #1 and Tag #2: Tag numbers include plastic tags attached to the seals flippers and substitute tag numbers allocated to those seals marked with paint in 1959 and those seals resighted by length and/or a distinguishing feature or injury. Information on plastic tags: -All tags used from 1976-1981 were yellow plastic - except 50 (30/9/76) which is red plastic diamond shaped, and 90a which is metal. -Tag numbers followed by a in 1976 are coffin shaped (note: a prefix of 0 was used in original tag rather than an a following the number). -Tag numbers followed by a in 1977 are combinations of shovel and coffin shaped parts (note: a prefix of 0 was used in original tag rather than an a following the number). -Tag numbers not followed by a in 1977 are shovel-shaped. -Tags used by 1986 were the 'Jumbo Rototag' which are smaller and made of less flexible plastic than the 'Allflex' tags originally used. -See references below for further information on tags and methods of tagging used. Information on substitute or'S' tags -Tags prefixed with S are substitute tags. Seals with a tag prefixed by S were not physically tagged with a plastic or metal tag. This 'tag number' was allocated when collating data from years when plastic tagging were not used and resights of seals were determined by either coloured markings painted on the seals (as in 1959) or by a combination of length, sex, distinguishing features or injuries. -S Tag numbers were allocated in date order of the original or 'New' sighting. Hence 'tag' S1 was allocated to the first seal sighted and then resighted in 1949. -Note: There are some instances where the original recorder of the sightings did not note any distinguishing features or paint markings on the seal but later recorded that the seal had been resighted. When this occurred the 'word' of the recorder was taken and an S tag allocated. Date: Date of sighting whether initial sighting or a resighting of the same seal. Location Codes: This field notes the location code for the area on Macquarie Island where the seal was sighted. The code corresponds to a grid reference on Macquarie Island that was originally used for locating Elephant Seal sightings. A listing of these reference codes is also attached to this dataset. The fields in the location code dataset are: Location Name, Location ID, Latitude and Longitude. Within the original records a number of locations were noted using outdated or informal names. These locations were renamed with the reference code now used for that location. A listing of the informal names and the location codes they respond to has been included in the Location Codes worksheet for reference. Sex: the sex of the seal is noted in this column as either: M = Male or F = Female. Length: The nose to tail length of the seal is noted in centimetres. Condition: This field details the general condition of the Leopard Seal. The coding is as follows: G = Good, F = Fair, P = Poor, T = Thin, E = Emancipated, D = Dead and K = Killed. Comments on Condition: This field is used to note any additional details regarding the condition of the animal including; whether the seal was moulting or had it's full fur, if the seal was solid or thin, the condition of the mouth, teeth and eyes; injuries including lacerations, tears, puncture / bite wounds or scars; and prominent features that could be used to recognise the seal if sighted again. Descriptions detailing the seal's health or temperament were also noted, these comments included: lively, aggressive, timid, sleepy and sluggish. Comments on movement and tagging: This field notes additional details on where the seal was sighted, it's movements and information regarding the tags used. Location of tag: UL = Upper left, UR = Upper right, LL = Lower left and LR = Lower right. W or E: What W and E relate to in regards to the seal sighting is currently unknown, however the information has been included as it may prove to be significant / useful. Sighting: This field defines the sighting as either N = New sighting or R = Resighting, ie the seal has been sighted previously and either 1) has been tagged or 2) has a predominant marking or feature that has made the seal recognisable. Note: if information was unknown the fields were left blank.
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The objectives for this project were: The project aims to quantify the patterns of dispersal and survival of newly weaned southern elephant seal pups to provide information on position at sea and foraging behaviour of the pups once they leave Macquarie Island, and to examine how this is related to position at sea and foraging behaviour in the second year. This information will be used to test the hypothesis that first year survival is a consequence of the young animals exploiting different foraging grounds to adults, and that fishing activity on the Campbell Plateau may be a contributing factor. In addition, stable isotope analysis and fatty acid signature analysis will be used to examine differences in foraging behaviour from animals while they are at sea. The raw data from this project is added to the long term database described by the metadata records 'Macquarie Island Elephant Seal Populations 1950-1965', and 'Macquarie Island Elephant Seal Populations 1985 Onwards'. This database has been taken offline, however. A snapshot of the database was taken in January, 1995, and is linked at the provided URL. For access, contact the Australian Antarctic Data Centre. A number of papers have been produced from this project. Some of these papers are included in the reference section below. The data collected for the database is as follows: Seal Number Status (new or resight) Date Location Age Class Status (cow, beachmaster, pregnant cow, dead etc) Sex Weight Length Size Back Fat Flipper Body Water Time Depth Recorder