{"id":{"repo_id":"brazil-uerj","oai_identifier":"oai:pantheon.ufrj.br:11422/3513"},"canonical_url":"https://search.dev.ndltd.org/etd/brazil-uerj/oai:pantheon.ufrj.br:11422/3513","repository":{"repo_id":"brazil-uerj","name":"Brazil UERJ","base_url":"https://pantheon.ufrj.br/oai/request"},"display":{"title":"Modelagem matemática do crescimento somático e mortalidade do ouriço-do-mar Cassidulus mitis Krau, 1954 (Echinoidea: Cassidulidae)","abstract":"The somatic growth of Cassidulus mitis Krau, 1954, a tropical brooding species, from a population located at the Vermelha Beach, Rio de Janeiro, Brazil, was analyzed by observing the monthly size distributions from December 1998 to April 2000, as well as by a mark-recapture experiment. These data were used to estimate the parameters necessary to construct growth curves defined by four different models by means of non-linear regressions (Brody-Bertalanffy, Richards, Gompertz and logistic models), and to estimate the natural mortality of this C. mitis population. The evaluation of the models was accomplished by (1) the analysis of the sum of the square residuals from the former non-linear regressions, (2) the analysis of the distribution of these residuals and (3) the comparison of linear regressions between the size predicted by the models and the size observed, from the recaptured specimens. The curve assigned by the Gompertz equation was considered the best one to describe the growth of C. mitis. The growth and mortality constants predicted by the model of Gompertz were 0.68 year^-1 and 0.63 year^-1, respectively. The analysis of the growth curve shows that C. mitis become potentially mature at the age of 2.2 years, shows the maximum growth rate values at 2.4 years, and has a life-span of 9.1 years.","abstract_html":"The somatic growth of Cassidulus mitis Krau, 1954, a tropical brooding species, from a population located at the Vermelha Beach, Rio de Janeiro, Brazil, was analyzed by observing the monthly size distributions from December 1998 to April 2000, as well as by a mark-recapture experiment. These data were used to estimate the parameters necessary to construct growth curves defined by four different models by means of non-linear regressions (Brody-Bertalanffy, Richards, Gompertz and logistic models), and to estimate the natural mortality of this C. mitis population. The evaluation of the models was accomplished by (1) the analysis of the sum of the square residuals from the former non-linear regressions, (2) the analysis of the distribution of these residuals and (3) the comparison of linear regressions between the size predicted by the models and the size observed, from the recaptured specimens. The curve assigned by the Gompertz equation was considered the best one to describe the growth of C. mitis. The growth and mortality constants predicted by the model of Gompertz were 0.68 year^-1 and 0.63 year^-1, respectively. The analysis of the growth curve shows that C. mitis become potentially mature at the age of 2.2 years, shows the maximum growth rate values at 2.4 years, and has a life-span of 9.1 years.","abstract_has_math":false,"creators":["Varotto, Ricardo Silva"],"institution":"Universidade Federal do Rio de Janeiro","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Ventura, Carlos Renato Rezende"],"committee_chairs":[],"committee_members":[],"year":2001,"date_issued":"2001-03-23","date_published":"2001-03-23","updated_at":"2026-07-24T01:16:04Z","subjects":["Ouriços-do-mar","Equinodermos","Cassidulus mitis","Crescimento animal","Mortalidade animal","Echinodermata","Echinoidea"],"languages":["por"],"rights":["Acesso Aberto"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11422/3513","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Ventura, Carlos Renato Rezende"]},{"key":"dc:creator","label":"Author","values":["Varotto, Ricardo Silva"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2018-01-19T13:47:16Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2026-05-16T03:03:32Z"]},{"key":"dc:date.issued","label":"Date","values":["2001-03-23"]},{"key":"dc:publisher","label":"Institution","values":["Universidade Federal do Rio de Janeiro"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Museu Nacional"]},{"key":"dc:type","label":"Dc Type","values":["Dissertação"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ouriços-do-mar","Equinodermos","Cassidulus mitis","Crescimento animal","Mortalidade animal","Echinodermata","Echinoidea"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["por"]},{"key":"dc:rights","label":"Dc Rights","values":["Acesso Aberto"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11422/3513"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The somatic growth of Cassidulus mitis Krau, 1954, a tropical brooding species, from a population located at the Vermelha Beach, Rio de Janeiro, Brazil, was analyzed by observing the monthly size distributions from December 1998 to April 2000, as well as by a mark-recapture experiment. These data were used to estimate the parameters necessary to construct growth curves defined by four different models by means of non-linear regressions (Brody-Bertalanffy, Richards, Gompertz and logistic models), and to estimate the natural mortality of this C. mitis population. The evaluation of the models was accomplished by (1) the analysis of the sum of the square residuals from the former non-linear regressions, (2) the analysis of the distribution of these residuals and (3) the comparison of linear regressions between the size predicted by the models and the size observed, from the recaptured specimens. The curve assigned by the Gompertz equation was considered the best one to describe the growth of C. mitis. The growth and mortality constants predicted by the model of Gompertz were 0.68 year^-1 and 0.63 year^-1, respectively. The analysis of the growth curve shows that C. mitis become potentially mature at the age of 2.2 years, shows the maximum growth rate values at 2.4 years, and has a life-span of 9.1 years."]},{"key":"dc:title","label":"Title","values":["Modelagem matemática do crescimento somático e mortalidade do ouriço-do-mar Cassidulus mitis Krau, 1954 (Echinoidea: Cassidulidae)"]}]}],"canonical_facts":{"dc:contributor.advisor":["Ventura, Carlos Renato Rezende"],"dc:creator":["Varotto, Ricardo Silva"],"dc:date.accessioned":["2018-01-19T13:47:16Z"],"dc:date.available":["2026-05-16T03:03:32Z"],"dc:date.issued":["2001-03-23"],"dc:description.abstract":["The somatic growth of Cassidulus mitis Krau, 1954, a tropical brooding species, from a population located at the Vermelha Beach, Rio de Janeiro, Brazil, was analyzed by observing the monthly size distributions from December 1998 to April 2000, as well as by a mark-recapture experiment. These data were used to estimate the parameters necessary to construct growth curves defined by four different models by means of non-linear regressions (Brody-Bertalanffy, Richards, Gompertz and logistic models), and to estimate the natural mortality of this C. mitis population. The evaluation of the models was accomplished by (1) the analysis of the sum of the square residuals from the former non-linear regressions, (2) the analysis of the distribution of these residuals and (3) the comparison of linear regressions between the size predicted by the models and the size observed, from the recaptured specimens. The curve assigned by the Gompertz equation was considered the best one to describe the growth of C. mitis. The growth and mortality constants predicted by the model of Gompertz were 0.68 year^-1 and 0.63 year^-1, respectively. The analysis of the growth curve shows that C. mitis become potentially mature at the age of 2.2 years, shows the maximum growth rate values at 2.4 years, and has a life-span of 9.1 years."],"dc:identifier.uri":["http://hdl.handle.net/11422/3513"],"dc:language":["por"],"dc:publisher":["Universidade Federal do Rio de Janeiro"],"dc:publisher.department":["Museu Nacional"],"dc:rights":["Acesso Aberto"],"dc:subject":["Ouriços-do-mar","Equinodermos","Cassidulus mitis","Crescimento animal","Mortalidade animal","Echinodermata","Echinoidea"],"dc:title":["Modelagem matemática do crescimento somático e mortalidade do ouriço-do-mar Cassidulus mitis Krau, 1954 (Echinoidea: Cassidulidae)"],"dc:type":["Dissertação"]},"updated_at":"2026-07-24T01:16:04Z"}