Latitudinal Range Influences the Seasonal Variation in the Foraging Behavior of Marine Top Predators
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{"title"=>"Latitudinal range influences the seasonal variation in the foraging behavior of marine top predators", "type"=>"journal", "authors"=>[{"first_name"=>"Stella", "last_name"=>"Villegas-Amtmann", "scopus_author_id"=>"24554386600"}, {"first_name"=>"Samantha E.", "last_name"=>"Simmons", "scopus_author_id"=>"16043758800"}, {"first_name"=>"Carey E.", "last_name"=>"Kuhn", "scopus_author_id"=>"12042096400"}, {"first_name"=>"Luis A.", "last_name"=>"Huckstadt", "scopus_author_id"=>"6506995716"}, {"first_name"=>"Daniel P.", "last_name"=>"Costa", "scopus_author_id"=>"24346625300"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"362315527", "issn"=>"19326203", "isbn"=>"1932-6203 (Electronic)\\n1932-6203 (Linking)", "doi"=>"10.1371/journal.pone.0023166", "scopus"=>"2-s2.0-80051534140", "pmid"=>"21853081", "sgr"=>"80051534140"}, "id"=>"4608c4a2-e754-3427-b3ae-62e873085483", "abstract"=>"Non-migratory resident species should be capable of modifying their foraging behavior to accommodate changes in prey abundance and availability associated with a changing environment. Populations that are better adapted to change will have higher foraging success and greater potential for survival in the face of climate change. We studied two species of resident central place foragers from temperate and equatorial regions with differing population trends and prey availability associated to season, the California sea lion (Zalophus californianus) (CSL) whose population is increasing and the endangered Galapagos sea lion (Zalophus wollebaeki) (GSL) whose population is declining. To determine their response to environmental change, we studied and compared their diving behavior using time-depth recorders and satellite location tags and their diet by measuring C and N isotope ratios during a warm and a cold season. Based on latitudinal differences in oceanographic productivity, we hypothesized that the seasonal variation in foraging behavior would differ for these two species. CSL exhibited greater seasonal variability in their foraging behavior as seen in changes to their diving behavior, foraging areas and diet between seasons. Conversely, GSL did not change their diving behavior between seasons, presenting three foraging strategies (shallow, deep and bottom divers) during both. GSL exhibited greater dive and foraging effort than CSL. We suggest that during the warm and less productive season a greater range of foraging behaviors in CSL was associated with greater competition for prey, which relaxed during the cold season when resource availability was greater. GSL foraging specialization suggests that resources are limited throughout the year due to lower primary production and lower seasonal variation in productivity compared to CSL. These latitudinal differences influence their foraging success, pup survival and population growth reflected in contrasting population trends in which CSL are more successful and potentially more resilient to climate change.", "link"=>"http://www.mendeley.com/research/latitudinal-range-influences-seasonal-variation-foraging-behavior-marine-top-predators-6", "reader_count"=>91, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Researcher"=>31, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>19, "Student > Postgraduate"=>3, "Other"=>12, "Student > Master"=>13, "Student > Bachelor"=>6, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Researcher"=>31, "Student > Doctoral Student"=>2, "Student > Ph. D. Student"=>19, "Student > Postgraduate"=>3, "Other"=>12, "Student > Master"=>13, "Student > Bachelor"=>6, "Lecturer"=>1, "Lecturer > Senior Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>2, "Engineering"=>1, "Environmental Science"=>9, "Agricultural and Biological Sciences"=>74, "Medicine and Dentistry"=>1, "Social Sciences"=>1, "Earth and Planetary Sciences"=>2, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>1}, "Social Sciences"=>{"Social Sciences"=>1}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>2}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>74}, "Unspecified"=>{"Unspecified"=>2}, "Environmental Science"=>{"Environmental Science"=>9}}, "reader_count_by_country"=>{"Ecuador"=>1, "Argentina"=>1, "Mozambique"=>1, "Turkey"=>1, "Norway"=>1, "Uruguay"=>1, "United States"=>2, "Brazil"=>1, "Mexico"=>3, "United Kingdom"=>2, "Chile"=>1, "Germany"=>1}, "group_count"=>2}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/748310"], "description"=>"<p>PDI = post-dive interval, IDZ = intra-depth zone dives.</p><p>Mean (±SD) and maximum dive parameters of individual female California sea lions (<i>Zalophus californianus</i>) from Granito Island, Mexico recorded for 15–27 days during a warm season (Jul–Aug 2005) (mean no. dives 2068±655) and for 22–89 days during a cold season (Feb–Mar 2007) (mean no. dives 8322±9511). Female IDs organized by groups produced by the cluster analysis.</p>", "links"=>[], "tags"=>["dive"], "article_id"=>418688, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.t001", "stats"=>{"downloads"=>5, "page_views"=>9, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_California_sea_lion_dive_parameters_/418688", "title"=>"California sea lion dive parameters.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 15:57:10"}
  • {"files"=>["https://ndownloader.figshare.com/files/748131"], "description"=>"<p>δ<sup>13</sup>C and δ<sup> 15</sup>N values of Galapagos (GSL, <i>Z. wollebaeki</i>) and California (CSL, <i>Z. californianus</i>) sea lion females for a warm (CSL, Jul–Aug. 2005, n = 10; GSL, Mar. 2005, n = 11) and a cold (CSL, Feb–Mar. 2007, n = 11; GSL, Aug–Sep. 2006, n = 11) season.</p>", "links"=>[], "tags"=>["california", "lions"], "article_id"=>418509, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.g004", "stats"=>{"downloads"=>0, "page_views"=>3, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Galapagos_and_California_sea_lions_13_C_and_948_15_N_values_/418509", "title"=>"Galapagos and California sea lions δ<sup>13</sup>C and δ<sup> 15</sup>N values.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 15:56:13"}
  • {"files"=>["https://ndownloader.figshare.com/files/748056"], "description"=>"<p>Kernel analyses of Galapagos (GSL, <i>Z. wollebaeki</i>) and California (CSL, <i>Z. californianus</i>) sea lion females' foraging areas during a warm (CSL, Jul–Aug. 2005, n = 10; GSL, Mar. 2005, n = 9) and a cold (CSL, Feb–Mar. 2007, n = 8; GSL, Aug–Sep. 2006, n = 10) season. Black arrow shows colony location.</p>", "links"=>[], "tags"=>["california", "foraging"], "article_id"=>418430, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.g003", "stats"=>{"downloads"=>0, "page_views"=>5, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Galapagos_and_California_sea_lions_foraging_areas_/418430", "title"=>"Galapagos and California sea lions' foraging areas.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 15:55:45"}
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  • {"files"=>["https://ndownloader.figshare.com/files/747925"], "description"=>"<p>Dive duration frequency distribution plots for California (CSL, <i>Z. californianus</i>) and Galapagos (GSL, <i>Z. wollebaeki</i>) sea lion females during a warm (CSL, Jul–Aug. 2005; GSL, Mar. 2005) and a cold (CSL, Feb–Mar. 2007; GSL, Aug–Sep. 2006) season.</p>", "links"=>[], "tags"=>["galapagos", "lions", "dive"], "article_id"=>418296, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.g002", "stats"=>{"downloads"=>0, "page_views"=>1, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_California_CSL_and_Galapagos_GSL_sea_lions_dive_durations_/418296", "title"=>"California (CSL) and Galapagos (GSL) sea lions dive durations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 15:54:57"}
  • {"files"=>["https://ndownloader.figshare.com/files/748244"], "description"=>"<p>PCA rotated loading matrix for Galapagos and California sea lion dive parameters from Granito Island, Mexico and Caamaño Islet, Galapagos for a warm (GSL, Mar.2005 and CSL, Jul–Aug.2005) and cold season (GSL, Feb–Mar.2006 and CSL, Feb–Mar.2007). In bold are loadings from the diving variables that contributed the most for Principal components (PC) 1–4.</p>", "links"=>[], "tags"=>["california", "lions", "dive", "parameters", "pca", "loading"], "article_id"=>418611, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.t002", "stats"=>{"downloads"=>1, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Galapagos_and_California_sea_lions_dive_parameters_PCA_loading_matrix_/418611", "title"=>"Galapagos and California sea lions dive parameters PCA loading matrix.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2013-02-20 15:56:47"}
  • {"files"=>["https://ndownloader.figshare.com/files/747838"], "description"=>"<p>California sea lion females (<i>Zalophus californianus</i>) from Granito Island, Mexico, cluster analyses for dive parameters during a warm season (Jul–Aug. 2005) and a cold season (Feb–Mar. 2007).</p>", "links"=>[], "tags"=>["lions", "diving"], "article_id"=>418207, "categories"=>["Inorganic Chemistry", "Neuroscience", "Ecology"], "users"=>["Stella Villegas-Amtmann", "Samantha E. Simmons", "Carey E. Kuhn", "Luis A. Hückstädt", "Daniel P. Costa"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0023166.g001", "stats"=>{"downloads"=>2, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_California_sea_lions_diving_behavior_cluster_analyses_/418207", "title"=>"California sea lions diving behavior cluster analyses.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2013-02-20 15:54:30"}

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Relative Metric

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