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| griddap | Subset | tabledap | Make A Graph | wms | files | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinPopulationonHumbleIsland.subset | https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinPopulationonHumbleIsland | https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinPopulationonHumbleIsland.graph | https://pallter-data.marine.rutgers.edu/erddap/files/AdeliePenguinPopulationonHumbleIsland/ | Adelie penguin breeding population arrival chronology on Humble Island, 1991, present.\\t | Adelie penguin breeding population arrival chronology on Humble Island, 1991 - present.\\t. The fundamental long-term objective of the seabird component of the Palmer LTER (PAL) has been to identify and understand the mechanistic processes that regulate the mean fitness (population growth rate) of regional penguin populations. Two hypotheses have guided this research, with one suggesting that population mean fitness is best explained by changes in regional krill biomass, and the other proposing that long-term changes in sea ice affects mean fitness by tipping the balance in favor of one species over another in accordance with species-specific evolved life history affinities to sea ice. Although these hypotheses are not mutually exclusive, current evidence in the PAL region tends to favor the latter over the former. Since the inception of PAL, Adélie penguin populations have effectively collapsed, while those of gentoo and chinstrap penguins have increased dramatically, trends that are spatially and temporally coherent with decreasing regional sea ice duration. Adélie penguins are an ice-obligate polar species whose life history is intimately linked to the presence of sea ice, while chinstrap and gentoo penguins are ice-intolerant species whose life histories evolved in the sub-Antarctic, where sea ice is a less permanent feature of the marine ecosystem. In contrast, although krill constitute the most important component of the summer diets by mass of these three penguin species, changes in PAL krill abundances have exhibited no long-term trends, and thus fail to explain the divergent patterns in penguin populations evident in our time series. \\n\\nThe arrival chronology of adult Adélie penguins on Humble Island is documented annually through island-wide censuses performed as ice and weather conditions permit. Recorded data (numbers of adults present) provide a measure of the number of adults arriving daily at the breeding colonies, a metric that is sensitive to environmental conditions such as sea ice extent during late winter and early spring. These data are also used in combination with other metrics to determine the optimal window for other, more extensive area-wide breeding population censuses (see CENSUS). \\n\n\ncdm_data_type = Other\nVARIABLES:\nstudy_name (Study)\ntime (Date GMT, seconds since 1970-01-01T00:00:00Z)\nisland_name (Island)\ncolony_code (Colony)\nnum_breeding_pairs (Adults)\n | https://pallter-data.marine.rutgers.edu/erddap/info/AdeliePenguinPopulationonHumbleIsland/index.htmlTable | https://pal.lternet.edu/
| http://pallter-data.marine.rutgers.edu/erddap/rss/AdeliePenguinPopulationonHumbleIsland.rss | https://pallter-data.marine.rutgers.edu/erddap/subscriptions/add.html?datasetID=AdeliePenguinPopulationonHumbleIsland&showErrors=false&email= | National Science Foundation | AdeliePenguinPopulationonHumbleIsland | ||||
| https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinAdultandChickCounts.subset | https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinAdultandChickCounts | https://pallter-data.marine.rutgers.edu/erddap/tabledap/AdeliePenguinAdultandChickCounts.graph | https://pallter-data.marine.rutgers.edu/erddap/files/AdeliePenguinAdultandChickCounts/ | Adelie penguin colony-specific chick production, 1991, present. | Adelie penguin colony-specific chick production, 1991 - present. The fundamental long-term objective of the seabird component of the Palmer LTER (PAL) has been to identify and understand the mechanistic processes that regulate the mean fitness (population growth rate) of regional penguin populations. Two hypotheses have guided this research, with one suggesting that population mean fitness is best explained by changes in regional krill biomass, and the other proposing that long-term changes in sea ice affects mean fitness by tipping the balance in favor of one species over another in accordance with species-specific evolved life history affinities to sea ice. Although these hypotheses are not mutually exclusive, current evidence in the PAL region tends to favor the latter over the former. Since the inception of PAL, Adélie penguin populations have effectively collapsed, while those of gentoo and chinstrap penguins have increased dramatically, trends that are spatially and temporally coherent with decreasing regional sea ice duration. Adélie penguins are an ice-obligate polar species whose life history is intimately linked to the presence of sea ice, while chinstrap and gentoo penguins are ice-intolerant species whose life histories evolved in the sub-Antarctic, where sea ice is a less permanent feature of the marine ecosystem. In contrast, although krill constitute the most important component of the summer diets by mass of these three penguin species, changes in PAL krill abundances have exhibited no long-term trends, and thus fail to explain the divergent patterns in penguin populations evident in our time series. \\n\\nThe PAL study region includes five main islands on which Adélie penguin colonies have historically occurred. These are censused synoptically once a year to determine the total number of chicks produced in the area. The optimal date for this census may vary by a few days each season, but ultimately tries to capture the week following the time when approximately 2/3 of the chicks have crèched. The timing of this census is assisted by the REPRO data, which provide a daily to weekly rate of change in the number of crèched chicks. Because the colonies used in this area-wide census are the same as those used to determine the overall annual breeding population, one of the key metrics obtained is an integrated number of breeding success (chicks crèched/breeding pair). These data have provided valuable insights into the marine and terrestrial factors that influence Adélie penguin mean population fitness. \\n\n\ncdm_data_type = Other\nVARIABLES:\nstudy_name (Study)\n... (6 more variables)\n | https://pallter-data.marine.rutgers.edu/erddap/info/AdeliePenguinAdultandChickCounts/index.htmlTable | https://pal.lternet.edu/
| http://pallter-data.marine.rutgers.edu/erddap/rss/AdeliePenguinAdultandChickCounts.rss | https://pallter-data.marine.rutgers.edu/erddap/subscriptions/add.html?datasetID=AdeliePenguinAdultandChickCounts&showErrors=false&email= | National Science Foundation | AdeliePenguinAdultandChickCounts |