Reproductive Isolation and Ecological Niche Partition among Larvae of the Morphologically Cryptic Sister Species Chironomus riparius and C. piger
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{"title"=>"Reproductive isolation and ecological niche partition among larvae of the morphologically cryptic sister species Chironomus riparius and C. piger", "type"=>"journal", "authors"=>[{"first_name"=>"Markus", "last_name"=>"Pfenninger", "scopus_author_id"=>"6603948584"}, {"first_name"=>"Carsten", "last_name"=>"Nowak", "scopus_author_id"=>"15127938900"}], "year"=>2008, "source"=>"PLoS ONE", "identifiers"=>{"isbn"=>"10.1371/journal.pone.0002157", "pmid"=>"18478074", "doi"=>"10.1371/journal.pone.0002157", "pui"=>"352025151", "issn"=>"19326203", "sgr"=>"47749097570", "scopus"=>"2-s2.0-47749097570"}, "id"=>"f5baccad-99c6-3ad1-a750-671cc7f86c59", "abstract"=>"BACKGROUND: One of the central issues in ecology is the question what allows sympatric occurrence of closely related species in the same general area? The non-biting midges Chironomus riparius and C. piger, interbreeding in the laboratory, have been shown to coexist frequently despite of their close relatedness, similar ecology and high morphological similarity.\\n\\nMETHODOLOGY/PRINCIPAL FINDINGS: In order to investigate factors shaping niche partitioning of these cryptic sister species, we explored the actual degree of reproductive isolation in the field. Congruent results from nuclear microsatellite and mitochondrial haplotype analyses indicated complete absence of interspecific gene-flow. Autocorrelation analysis showed a non-random spatial distribution of the two species. Though not dispersal limited at the scale of the study area, the sister species occurred less often than expected at the same site, indicating past or present competition. Correlation and multiple regression analyses suggested the repartition of the available habitat along water chemistry gradients (nitrite, conductivity, CaCO(3)), ultimately governed by differences in summer precipitation regime.\\n\\nCONCLUSIONS: We show that these morphologically cryptic sister species partition their niches due to a certain degree of ecological distinctness and total reproductive isolation in the field. The coexistence of these species provides a suitable model system for the investigation of factors shaping the distribution of closely related, cryptic species.", "link"=>"http://www.mendeley.com/research/reproductive-isolation-ecological-niche-partition-among-larvae-morphologically-cryptic-sister-specie", "reader_count"=>48, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>6, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>11, "Student > Postgraduate"=>2, "Student > Master"=>7, "Student > Bachelor"=>8}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>6, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>11, "Student > Postgraduate"=>2, "Student > Master"=>7, "Student > Bachelor"=>8}, "reader_count_by_subject_area"=>{"Unspecified"=>4, "Environmental Science"=>6, "Biochemistry, Genetics and Molecular Biology"=>7, "Agricultural and Biological Sciences"=>30, "Physics and Astronomy"=>1}, "reader_count_by_subdiscipline"=>{"Physics and Astronomy"=>{"Physics and Astronomy"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>30}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>7}, "Unspecified"=>{"Unspecified"=>4}, "Environmental Science"=>{"Environmental Science"=>6}}, "reader_count_by_country"=>{"United States"=>2, "China"=>1, "Poland"=>1, "Germany"=>1}, "group_count"=>1}

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  • {"files"=>["https://ndownloader.figshare.com/files/930858"], "description"=>"<p>Dashed lines indicate the 95% confidence interval of observed Moran's I being significantly different from zero, derived from 999 permutations.</p>", "links"=>[], "tags"=>["autocorrelation", "lag-classes"], "article_id"=>601312, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.g004", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Spatial_autocorrelation_analysis_of_the_relative_C_riparius_frequency_for_lag_classes_of_5_km_/601312", "title"=>"Spatial autocorrelation analysis of the relative <i>C. riparius</i> frequency for lag-classes of 5 km.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2008-05-14 00:21:52"}
  • {"files"=>["https://ndownloader.figshare.com/files/930898"], "description"=>"<p>Sampling sites, their geographical position , number of <i>C. riparius/piger</i>individuals found on 1 m<sup>2</sup> and number of individuals used for genetic analysis.</p>", "links"=>[], "tags"=>["geographical", "individuals"], "article_id"=>601347, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.t001", "stats"=>{"downloads"=>5, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Sampling_sites_their_geographical_position_number_of_C_riparius_piger_individuals_found_on_1_m_2_and_number_of_individuals_used_for_genetic_analysis_/601347", "title"=>"Sampling sites, their geographical position , number of <i>C. riparius/piger</i>individuals found on 1 m<sup>2</sup> and number of individuals used for genetic analysis.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2008-05-14 00:22:27"}
  • {"files"=>["https://ndownloader.figshare.com/files/930803"], "description"=>"<p>The size of the circles corresponds to the number of individuals sampled.</p>", "links"=>[], "tags"=>["sampling", "points", "rhine", "charts"], "article_id"=>601252, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.g003", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Map_of_the_sampling_points_in_the_Rhine_valley_with_pie_charts_of_the_relative_frequency_of_Chironomus_riparius_black_and_C_piger_grey_/601252", "title"=>"Map of the sampling points in the Rhine valley with pie charts of the relative frequency of <i>Chironomus riparius</i> (black) and <i>C. piger</i> (grey).", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2008-05-14 00:20:52"}
  • {"files"=>["https://ndownloader.figshare.com/files/930740"], "description"=>"<p>The size of the circles is proportional to the number of individuals with the respective haplotypes. Polygons mark the 3-step clades. The nuclear genotype of the respective individuals is indicated (A = grey, B = black).</p>", "links"=>[], "tags"=>["parsimony", "mitochondrial", "coi"], "article_id"=>601190, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.g002", "stats"=>{"downloads"=>1, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Statistical_parsimony_network_of_the_mitochondrial_COI_haplotypes_/601190", "title"=>"Statistical parsimony network of the mitochondrial COI haplotypes.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2008-05-14 00:19:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/930684"], "description"=>"<p>A) The two obvious groups of <i>Chironomus</i> individuals separated along axis 1 are termed genotype A (grey squares) and genotype B (black diamonds). B) Contribution of microsatellite alleles, coded after locus. Most microsatellite alleles are typical if not exclusive for one of the two genotypes, only few alleles occur in similar proportions in both clusters.</p>", "links"=>[], "tags"=>["individuals", "microsatellite", "alleles", "axes", "factorial", "correspondence"], "article_id"=>601128, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.g001", "stats"=>{"downloads"=>1, "page_views"=>4, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Factor_score_plot_of_A_individuals_and_B_microsatellite_alleles_on_the_first_two_axes_of_factorial_correspondence_analysis_/601128", "title"=>"Factor score plot of A) individuals and B) microsatellite alleles on the first two axes of factorial correspondence analysis.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2008-05-14 00:18:48"}
  • {"files"=>["https://ndownloader.figshare.com/files/930977"], "description"=>"<p>The regression was significant (N = 18, F<sub>(5,12)</sub> = 6.7, <i>p</i> = 0.003, corr. r<sup>2</sup> = 0.63).</p>", "links"=>[], "tags"=>["regression", "correlated", "frequencies"], "article_id"=>601426, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.t004", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Multiple_regression_of_environmental_parameters_significantly_correlated_with_relative_C_riparius_frequencies_forward_selection_/601426", "title"=>"Multiple regression of environmental parameters significantly correlated with relative <i>C. riparius</i> frequencies (forward selection).", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2008-05-14 00:23:46"}
  • {"files"=>["https://ndownloader.figshare.com/files/930945"], "description"=>"<p>Significance of variance components was assessed with 9999 permutations.</p>", "links"=>[], "tags"=>["amova", "microsatellite"], "article_id"=>601397, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.t002", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Population_structure_estimated_with_AMOVA_of_microsatellite_data_for_Chironomus_piger_and_C_riparius_/601397", "title"=>"Population structure estimated with AMOVA of microsatellite data for <i>Chironomus piger</i> and <i>C. riparius</i>.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2008-05-14 00:23:17"}
  • {"files"=>["https://ndownloader.figshare.com/files/930920"], "description"=>"<p>Correlations with p<0.05 and q<0.1 are marked with asterisks.</p>", "links"=>[], "tags"=>["coefficients", "variables", "frequencies", "respective"], "article_id"=>601370, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157.t003", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Pearson_correlation_coefficients_r_of_environmental_variables_with_relative_frequencies_of_C_riparius_and_the_respective_p_and_q_values_for_multiple_comparisons_/601370", "title"=>"Pearson correlation coefficients (<i>r</i>) of environmental variables with relative frequencies of <i>C. riparius</i> and the respective <i>p</i> and <i>q</i> values for multiple comparisons.", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2008-05-14 00:22:50"}
  • {"files"=>["https://ndownloader.figshare.com/files/458976"], "description"=>"<div><h3>Background</h3><p>One of the central issues in ecology is the question what allows sympatric occurrence of closely related species in the same general area? The non-biting midges <em>Chironomus riparius</em> and <em>C. piger</em>, interbreeding in the laboratory, have been shown to coexist frequently despite of their close relatedness, similar ecology and high morphological similarity.</p><h3>Methodology/Principal Findings</h3><p>In order to investigate factors shaping niche partitioning of these cryptic sister species, we explored the actual degree of reproductive isolation in the field. Congruent results from nuclear microsatellite and mitochondrial haplotype analyses indicated complete absence of interspecific gene-flow. Autocorrelation analysis showed a non-random spatial distribution of the two species. Though not dispersal limited at the scale of the study area, the sister species occurred less often than expected at the same site, indicating past or present competition. Correlation and multiple regression analyses suggested the repartition of the available habitat along water chemistry gradients (nitrite, conductivity, CaCO<sub>3</sub>), ultimately governed by differences in summer precipitation regime.</p><h3>Conclusions</h3><p>We show that these morphologically cryptic sister species partition their niches due to a certain degree of ecological distinctness and total reproductive isolation in the field. The coexistence of these species provides a suitable model system for the investigation of factors shaping the distribution of closely related, cryptic species.</p></div>", "links"=>[], "tags"=>["reproductive", "niche", "partition", "larvae", "morphologically", "cryptic"], "article_id"=>150429, "categories"=>["Ecology"], "users"=>["Markus Pfenninger", "Carsten Nowak"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0002157", "stats"=>{"downloads"=>10, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Reproductive_Isolation_and_Ecological_Niche_Partition_among_Larvae_of_the_Morphologically_Cryptic_Sister_Species_Chironomus_riparius_and_C_piger_/150429", "title"=>"Reproductive Isolation and Ecological Niche Partition among Larvae of the Morphologically Cryptic Sister Species <em>Chironomus riparius</em> and <em>C. piger</em>", "pos_in_sequence"=>0, "defined_type"=>3, "published_date"=>"2008-05-14 00:07:09"}

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Relative Metric

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