{"id":"https://openalex.org/W2013301128","doi":"https://doi.org/10.2989/ajms.2007.29.2.2.185","title":"Making sense of censuses and dealing with missing data: trends in pup counts of Cape fur sealArctocephalus pusillus pusillusfor the period 1972\u20132004","display_name":"Making sense of censuses and dealing with missing data: trends in pup counts of Cape fur sealArctocephalus pusillus pusillusfor the period 1972\u20132004","publication_year":2007,"publication_date":"2007-08-01","ids":{"openalex":"https://openalex.org/W2013301128","doi":"https://doi.org/10.2989/ajms.2007.29.2.2.185","mag":"2013301128"},"language":"en","primary_location":{"id":"doi:10.2989/ajms.2007.29.2.2.185","doi":"https://doi.org/10.2989/ajms.2007.29.2.2.185","is_oa":false,"landing_page_url":"https://doi.org/10.2989/ajms.2007.29.2.2.185","pdf_url":null,"source":{"id":"https://openalex.org/S121195568","display_name":"African Journal of Marine Science","issn_l":"1814-232X","issn":["1814-232X","1814-2338"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dhet","dongbi-c","jpps-1","jufo-1","norway-1","poland-70","russia-white-list-3"],"host_organization":"https://openalex.org/P4310320547","host_organization_name":"Taylor & Francis","host_organization_lineage":["https://openalex.org/P4310320547","https://openalex.org/P4310320449"],"host_organization_lineage_names":["Taylor & Francis","Informa"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"African Journal of Marine Science","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"http://hdl.handle.net/11427/27157","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5088706399","display_name":"Stephen P. Kirkman","orcid":"https://orcid.org/0000-0001-5428-7375","observed_orcids":["https://orcid.org/0000-0001-5428-7375"]},"institutions":[{"id":"https://openalex.org/I157614274","display_name":"University of Cape Town","ror":"https://ror.org/03p74gp79","country_code":"ZA","type":"education","lineage":["https://openalex.org/I157614274"]}],"countries":["ZA"],"is_corresponding":false,"raw_author_name":"SP Kirkman","raw_affiliation_strings":["University of Cape Town)"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"University of Cape Town)","institution_ids":["https://openalex.org/I157614274"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5041961969","display_name":"W. Herman Oosthuizen","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"WH Oosthuizen","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5080280790","display_name":"MA Me\u00ffer","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"MA Me\u00ffer","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5087047301","display_name":"P. G. H. Kotze","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"PGH Kotze","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"middle","author":{"id":"https://openalex.org/A5032814260","display_name":"J-P Roux","orcid":"https://orcid.org/0000-0001-5883-2342","observed_orcids":["https://orcid.org/0000-0001-5883-2342","https://orcid.org/0000-0002-1628-9545"]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"J-P Roux","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"last","author":{"id":"https://openalex.org/A5076445360","display_name":"Les G Underhill","orcid":"https://orcid.org/0000-0002-8758-1527","observed_orcids":["https://orcid.org/0000-0002-8758-1527"]},"institutions":[{"id":"https://openalex.org/I157614274","display_name":"University of Cape Town","ror":"https://ror.org/03p74gp79","country_code":"ZA","type":"education","lineage":["https://openalex.org/I157614274"]}],"countries":["ZA"],"is_corresponding":false,"raw_author_name":"LG Underhill","raw_affiliation_strings":["University of Cape Town)"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"University of Cape Town)","institution_ids":["https://openalex.org/I157614274"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":2.9342,"has_fulltext":true,"cited_by_count":66,"citation_normalized_percentile":{"value":0.89135783,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":{"min":93,"max":99},"biblio":{"volume":"29","issue":"2","first_page":"161","last_page":"176"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10659","display_name":"Marine animal studies overview","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10659","display_name":"Marine animal studies overview","score":0.9990000128746033,"subfield":{"id":"https://openalex.org/subfields/2303","display_name":"Ecology"},"field":{"id":"https://openalex.org/fields/23","display_name":"Environmental Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10230","display_name":"Marine and fisheries research","score":0.00019999999494757503,"subfield":{"id":"https://openalex.org/subfields/1104","display_name":"Aquatic Science"},"field":{"id":"https://openalex.org/fields/11","display_name":"Agricultural and Biological Sciences"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}},{"id":"https://openalex.org/T13546","display_name":"Census and Population Estimation","score":0.00019999999494757503,"subfield":{"id":"https://openalex.org/subfields/2613","display_name":"Statistics and Probability"},"field":{"id":"https://openalex.org/fields/26","display_name":"Mathematics"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/cape-fur-seal","display_name":"Cape fur seal","score":1.0},{"id":"https://openalex.org/keywords/arctocephalus-pusillus-pusillus","display_name":"Arctocephalus pusillus pusillus","score":1.0},{"id":"https://openalex.org/keywords/pup-counts","display_name":"pup counts","score":0.9340000152587891},{"id":"https://openalex.org/keywords/population-trends","display_name":"population trends","score":0.9470000267028809},{"id":"https://openalex.org/keywords/missing-data","display_name":"missing data","score":0.6290000081062317},{"id":"https://openalex.org/keywords/aerial-photography","display_name":"aerial photography","score":0.4519999921321869},{"id":"https://openalex.org/keywords/seal-colonies","display_name":"seal colonies","score":0.6510000228881836},{"id":"https://openalex.org/keywords/birth-rate","display_name":"birth rate","score":0.5189999938011169},{"id":"https://openalex.org/keywords/northward-range-shift","display_name":"northward range shift","score":0.6890000104904175}],"concepts":[{"id":"https://openalex.org/C2778799465","wikidata":"https://www.wikidata.org/wiki/Q1043473","display_name":"Fur seal","level":2,"score":0.9042304754257202},{"id":"https://openalex.org/C2777628658","wikidata":"https://www.wikidata.org/wiki/Q1034198","display_name":"Cape","level":2,"score":0.8809360265731812},{"id":"https://openalex.org/C2908647359","wikidata":"https://www.wikidata.org/wiki/Q2625603","display_name":"Population","level":2,"score":0.6171460747718811},{"id":"https://openalex.org/C194051981","wikidata":"https://www.wikidata.org/wiki/Q1337691","display_name":"Economic shortage","level":3,"score":0.5772809982299805},{"id":"https://openalex.org/C205649164","wikidata":"https://www.wikidata.org/wiki/Q1071","display_name":"Geography","level":0,"score":0.5416548252105713},{"id":"https://openalex.org/C86803240","wikidata":"https://www.wikidata.org/wiki/Q420","display_name":"Biology","level":0,"score":0.48917272686958313},{"id":"https://openalex.org/C2780148112","wikidata":"https://www.wikidata.org/wiki/Q1432581","display_name":"Proxy (statistics)","level":2,"score":0.47265613079071045},{"id":"https://openalex.org/C188382862","wikidata":"https://www.wikidata.org/wiki/Q170430","display_name":"Predation","level":2,"score":0.4671245217323303},{"id":"https://openalex.org/C18903297","wikidata":"https://www.wikidata.org/wiki/Q7150","display_name":"Ecology","level":1,"score":0.3870600461959839},{"id":"https://openalex.org/C90856448","wikidata":"https://www.wikidata.org/wiki/Q431","display_name":"Zoology","level":1,"score":0.378530889749527},{"id":"https://openalex.org/C505870484","wikidata":"https://www.wikidata.org/wiki/Q180538","display_name":"Fishery","level":1,"score":0.3503080904483795},{"id":"https://openalex.org/C149923435","wikidata":"https://www.wikidata.org/wiki/Q37732","display_name":"Demography","level":1,"score":0.3475310802459717},{"id":"https://openalex.org/C166957645","wikidata":"https://www.wikidata.org/wiki/Q23498","display_name":"Archaeology","level":1,"score":0.10811212658882141},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.07849270105361938},{"id":"https://openalex.org/C2778137410","wikidata":"https://www.wikidata.org/wiki/Q2732820","display_name":"Government (linguistics)","level":2,"score":0.0},{"id":"https://openalex.org/C41895202","wikidata":"https://www.wikidata.org/wiki/Q8162","display_name":"Linguistics","level":1,"score":0.0},{"id":"https://openalex.org/C144024400","wikidata":"https://www.wikidata.org/wiki/Q21201","display_name":"Sociology","level":0,"score":0.0},{"id":"https://openalex.org/C138885662","wikidata":"https://www.wikidata.org/wiki/Q5891","display_name":"Philosophy","level":0,"score":0.0},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.0}],"mesh":[],"locations_count":4,"locations":[{"id":"doi:10.2989/ajms.2007.29.2.2.185","doi":"https://doi.org/10.2989/ajms.2007.29.2.2.185","is_oa":false,"landing_page_url":"https://doi.org/10.2989/ajms.2007.29.2.2.185","pdf_url":null,"source":{"id":"https://openalex.org/S121195568","display_name":"African Journal of Marine Science","issn_l":"1814-232X","issn":["1814-232X","1814-2338"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dhet","dongbi-c","jpps-1","jufo-1","norway-1","poland-70","russia-white-list-3"],"host_organization":"https://openalex.org/P4310320547","host_organization_name":"Taylor & Francis","host_organization_lineage":["https://openalex.org/P4310320547","https://openalex.org/P4310320449"],"host_organization_lineage_names":["Taylor & Francis","Informa"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"African Journal of Marine Science","raw_type":"journal-article"},{"id":"pmh:oai:ajol.info:article/33474","doi":null,"is_oa":false,"landing_page_url":"https://www.ajol.info/index.php/ajms/article/view/33474","pdf_url":null,"source":{"id":"https://openalex.org/S121195568","display_name":"African Journal of Marine Science","issn_l":"1814-232X","issn":["1814-232X","1814-2338"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dhet","dongbi-c","jpps-1","jufo-1","norway-1","poland-70","russia-white-list-3"],"host_organization":"https://openalex.org/P4310320547","host_organization_name":"Taylor & Francis","host_organization_lineage":["https://openalex.org/P4310320547","https://openalex.org/P4310320449"],"host_organization_lineage_names":["Taylor & Francis","Informa"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"1814-232X","raw_type":"info:eu-repo/semantics/article"},{"id":"pmh:oai:localhost:11427/27157","doi":null,"is_oa":true,"landing_page_url":"http://hdl.handle.net/11427/27157","pdf_url":"http://hdl.handle.net/11427/27157","source":{"id":"https://openalex.org/S4306402129","display_name":"Open University of Cape Town (University of Cape Town)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I157614274","host_organization_name":"University of Cape Town","host_organization_lineage":["https://openalex.org/I157614274"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"African Journal of Marine Science","raw_type":"Journal Article"},{"id":"pmh:oai:open.uct.ac.za:11427/27157","doi":null,"is_oa":false,"landing_page_url":"http://doi.org/10.2989/AJMS.2007.29.2.2.185","pdf_url":null,"source":{"id":"https://openalex.org/S4306402129","display_name":"Open University of Cape Town (University of Cape Town)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I157614274","host_organization_name":"University of Cape Town","host_organization_lineage":["https://openalex.org/I157614274"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"African Journal of Marine Science","raw_type":"Journal Article"}],"best_oa_location":{"id":"pmh:oai:localhost:11427/27157","doi":null,"is_oa":true,"landing_page_url":"http://hdl.handle.net/11427/27157","pdf_url":"http://hdl.handle.net/11427/27157","source":{"id":"https://openalex.org/S4306402129","display_name":"Open University of Cape Town (University of Cape Town)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I157614274","host_organization_name":"University of Cape Town","host_organization_lineage":["https://openalex.org/I157614274"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"African Journal of Marine Science","raw_type":"Journal Article"},"sustainable_development_goals":[{"display_name":"Life below water","id":"https://metadata.un.org/sdg/14","score":1.0}],"study_designs":[],"awards":[],"funders":[{"id":"https://openalex.org/F4320306320","display_name":"Earthwatch Institute","ror":"https://ror.org/0585vsm16"},{"id":"https://openalex.org/F4320320671","display_name":"National Research Foundation","ror":"https://ror.org/05s0g1g46"},{"id":"https://openalex.org/F4320321091","display_name":"Coordena\u00e7\u00e3o de Aperfei\u00e7oamento de Pessoal de N\u00edvel Superior","ror":"https://ror.org/00x0ma614"},{"id":"https://openalex.org/F4320324164","display_name":"University of Cape Town","ror":"https://ror.org/03p74gp79"}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W2013301128.pdf","grobid_xml":"https://content.openalex.org/works/W2013301128.grobid-xml"},"referenced_works_count":26,"referenced_works":["https://openalex.org/W594441900","https://openalex.org/W1550910865","https://openalex.org/W1972464821","https://openalex.org/W1973192023","https://openalex.org/W1980065221","https://openalex.org/W1980618012","https://openalex.org/W1981969317","https://openalex.org/W1997606922","https://openalex.org/W2002083580","https://openalex.org/W2011459263","https://openalex.org/W2014317435","https://openalex.org/W2022094797","https://openalex.org/W2040049388","https://openalex.org/W2045709739","https://openalex.org/W2050427999","https://openalex.org/W2050601695","https://openalex.org/W2079062904","https://openalex.org/W2088224522","https://openalex.org/W2089376508","https://openalex.org/W2103899354","https://openalex.org/W2282665635","https://openalex.org/W2305357300","https://openalex.org/W2314215739","https://openalex.org/W2323955951","https://openalex.org/W2768556702","https://openalex.org/W2898772804"],"related_works":["https://openalex.org/W2002541932","https://openalex.org/W2111787957","https://openalex.org/W2045709739","https://openalex.org/W4234084553","https://openalex.org/W2009054608","https://openalex.org/W4221134317","https://openalex.org/W2021202544","https://openalex.org/W2909297104","https://openalex.org/W2041834866","https://openalex.org/W2981957700"],"abstract_inverted_index":{"Trends":[0],"in":[1,30,39,42,74,87,100,105,112,140,145,197],"the":[2,31,80,90,141,146,198,202],"population":[3,33,200],"of":[4,15,20,47,76,123,126,143,164,168,201],"Cape":[5,203],"fur":[6,204],"seals":[7,144,205],"Arctocephalus":[8],"pusillus":[9,10],"were":[11,54,63,103,155],"estimated":[12,211],"from":[13],"counts":[14,78,154,189],"pups":[16],"on":[17,121,162],"aerial":[18],"photographs":[19],"colonies":[21],"taken":[22],"between":[23,79,89,159],"1972":[24],"and":[25,34,56,67,92,108],"2004":[26],"to":[27,65,119],"determine":[28],"trends":[29,75],"overall":[32,199],"subpopulations.":[35],"Incomplete":[36],"coverage":[37],"resulted":[38],"missing":[40,52,182],"data":[41,53,183],"some":[43,106],"years.":[44],"Various":[45],"methods":[46,62],"determining":[48,178],"proxy":[49,179],"values":[50,180],"for":[51,177,181],"assessed,":[55],"it":[57,209],"was":[58,83,110,136,174,210],"concluded":[59],"that":[60,131,191],"different":[61],"applicable":[64],"Namibian":[66],"South":[68,151,185],"African":[69,186],"colonies.":[70,116,187],"This":[71,117],"reflected":[72],"variation":[73],"pup":[77,101,153],"countries,":[81],"which":[82],"associated":[84],"with":[85],"differences":[86],"productivity":[88],"southern":[91],"northern":[93,147],"Benguela":[94,148],"ecosystems.":[95],"In":[96,150],"Namibia,":[97],"temporal":[98],"changes":[99],"numbers":[102],"non-linear":[104],"years":[107],"there":[109,192],"correspondence":[111],"fluctuations":[113],"at":[114,184,212],"most":[115],"appeared":[118],"be":[120],"account":[122,163],"an":[124],"effect":[125],"periodic,":[127],"wide-scale":[128],"prey":[129],"shortages":[130],"reduced":[132],"birth":[133],"rates.":[134],"There":[135],"a":[137,165],"northward":[138],"shift":[139],"distribution":[142],"system.":[149],"Africa,":[152],"much":[156],"less":[157],"variable":[158],"years,":[160],"probably":[161],"relative":[166],"stability":[167],"food":[169],"supply.":[170],"A":[171],"linear":[172],"approach":[173],"therefore":[175],"suitable":[176],"Pup":[188],"suggest":[190],"has":[193],"been":[194],"little":[195],"change":[196],"since":[206],"1993,":[207],"when":[208],"about":[213],"two":[214],"million":[215],"animals.":[216]},"counts_by_year":[{"year":2026,"cited_by_count":6},{"year":2025,"cited_by_count":2},{"year":2023,"cited_by_count":3},{"year":2022,"cited_by_count":6},{"year":2021,"cited_by_count":2},{"year":2020,"cited_by_count":5},{"year":2019,"cited_by_count":3},{"year":2018,"cited_by_count":3},{"year":2017,"cited_by_count":2},{"year":2016,"cited_by_count":2},{"year":2015,"cited_by_count":5},{"year":2014,"cited_by_count":3},{"year":2013,"cited_by_count":5},{"year":2012,"cited_by_count":4}],"updated_date":"2026-11-10T11:39:43.021295","created_date":"2016-06-24T00:00:00"}
