Show simple item record

dc.contributor.advisorAcosta, Jaime
dc.contributor.authorCely Ortiz, Christian Camilo
dc.date.accessioned2018-02-15T19:30:30Z
dc.date.available2018-02-15T19:30:30Z
dc.date.issued2014
dc.identifier.urihttps://hdl.handle.net/20.500.11801/256
dc.description.abstractThe remarkable ecological success of the eusocial insects has been attributed, in part, to the economic division of labor within the colony. This behavioral specialization is mediated by variation in a host of morphological characters. Elucidating the connections between morphological and behavioral characteristics represents a critical step toward understanding the evolution of eusocial insects. I tested the hypothesis that task specialization is associated with specialized exocrine gland morphology and facial morphology. Twenty two individuals of the eusocial paper wasp Mischocyttarus mexicanus cubicola, were marked and video-recorded in vivo. I scored five classes of behavior: nursing, foraging, building, guarding and dominance using video recordings. The animals were sacrified and their heads and abdomens were dissected. Histological sections were made, and the following exocrine glands were measured: hypopharyngeal, ectomandibular, intramandibular, clypeal, Richard’s and Van der Vecht’s. Correlation tests revealed that the size of the intramandibular gland was positively associated with dominance behavior while the size of Van der Vecht’s gland was negatively correlated with nursing behavior. The wasps' faces were photographed and a geometric morphometric analysis was conducted. I did not identify any significant correlations between behavior and facial geometric morphology. I conclude that nest defense and dominance interactions generate selective pressures that affect gland structure, but I did not find evidence that similar selection pressures affect facial morphology.
dc.description.abstractEl alto éxito ecológico en insectos eusociales ha sido en parte atribuido a las divisiones de trabajo en la colonia. Estas especializaciones comportamentales están mediadas por la modificación morfológica de estructuras. Por lo tanto, encontrar la conexión entre características morfológicas y comportamentales es clave para el entendimiento de la evolución de insectos sociales. Yo probé la hipótesis de que la especialización en tareas selecciona la evolución de adaptaciones morfológicas. Veintidós especímenes de la avispa de papel eusocial Mischocyttarus mexicanus cubicola fueron marcadas y video grabadas in vivo. Yo registré cinco clases de comportamientos: enfermera, pecoreadora, constructora, guardiana y dominante. Los animales fueron sacrificados y sus cabezas y abdómenes fueron disectados. Se hicieron cortes histológicos midiendo las siguientes glándulas exocrinas: hipofaringeal, ectomandibular, intramandibular, clipeal, de Richard y de Van der Vecht. Pruebas de correlación mostraron que el tamaño de la glándula intramandibular fue positivamente asociada con comportamientos dominantes mientras el tamaño de la glándula de Van der Vecht fue negativamente asociada con el comportamiento de enfermera. Las caras de las avispas fueron fotografiadas y se hizo un análisis de morfometría geométrica. Yo no identifiqué ninguna correlación significativa entre comportamiento y morfometría geométrica facial. Yo concluyo que la defensa del nido e interacciones de dominancia generan presiones selectivas que afectan la estructura glandular, sin embargo yo no encontré evidencia que presiones selectivas similares afecten la morfología facial.
dc.language.isoenen_US
dc.subjecteusocial insectsen_US
dc.subjectexocrine gland morphologyen_US
dc.subjectfacial morphologyen_US
dc.subjectMischocyttarus mexicanus cubicolaen_US
dc.subjectVan der Vecht’s glanden_US
dc.subjectRichard’s and Van der Vecht’s. Correlation testsen_US
dc.subject.lcshWasps--Puerto Rico--Biological controlen_US
dc.subject.lcshMischocyttarus--Puerto Ricoen_US
dc.subject.lcshExocrine glandsen_US
dc.subject.lcshNatural selection--Puerto Ricoen_US
dc.subject.lcshExocrine glands--Morphologyen_US
dc.titleSocial behavior, exocrine glands and facial structure in Mischocyttarus mexicanus cubicola Richards (Hymenoptera, Vespidae)en_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2014 Christian Camilo Cely Ortizen_US
dc.contributor.committeeLogue, David M.
dc.contributor.committeeSantos, Carlos J.
dc.contributor.representativeJimenez, Esbal
thesis.degree.levelM.S.en_US
thesis.degree.disciplineBiologyen_US
dc.type.thesisThesisen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Biologyen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2014en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

  • Theses & Dissertations
    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

Show simple item record