Video Experimental Relacionado
Updated: Jul 6, 2026
08:00
Derivation of Cardiac Progenitor Cells from Embryonic Stem Cells
Published on: January 12, 2015
Evolución de los cangrejos rey de los antepasados del cangrejo ermitaño
C W Cunningham1, N W Blackstone, L W Buss
1Department of Biology, Yale University, New Haven, Connecticut 06511.
Nature
|February 6, 1992
Resumen
Los cangrejos reyes evolucionaron de los cangrejos ermitaños, perdiendo su hábito de vivir en conchas y desarrollando una forma parecida al cangrejo (carcinosis) en solo 13-25 millones de años. Esta rápida transformación es un hallazgo clave para comprender la evolución de los crustáceos.
Área de la Ciencia:
- Biología Marina Biología Marina.
- Biología evolutiva Biología evolutiva.
- Investigación de crustáceos Investigación de crustáceos.
Sus antecedentes:
- Los cangrejos reyes (Familia Lithodidae) exhiben una morfología parecida a la del cangrejo y un gran tamaño, en contraste con los cangrejos ermitaños dependientes de la concha.
- La evolución del cangrejo ermitaño ha estado limitada por la vida en conchas, lo que requiere una morfología abdominal específica y un tamaño limitado.
- La carcinización, la evolución de una forma parecida al cangrejo de un ancestro del cangrejo ermitaño, ha ocurrido de forma independiente en varios linajes.
Objetivo del estudio:
- Para determinar la tasa evolutiva de carcinización en los cangrejos rey.
- Para investigar la relación filogenética entre los cangrejos rey y los cangrejos ermitaños.
- Para estimar el marco de tiempo para la pérdida de la vivienda en concha y el desarrollo de la morfología similar al cangrejo en los cangrejos rey.
Principales métodos:
- Análisis filogenético molecular para reconstruir las relaciones evolutivas.
- Estudios morfológicos comparativos de los cangrejos rey y los cangrejos ermitaños.
- Estimaciones del reloj molecular para fechar eventos evolutivos.
Principales resultados:
- La evidencia molecular confirma que los cangrejos rey están anidados dentro del género de cangrejo ermitaño Pagurus.
- La transición del cangrejo ermitaño que vivía en conchas al cangrejo rey completamente carcinado ocurrió rápidamente.
- El plazo estimado para la carcinización completa es de entre 13 y 25 millones de años.
Conclusiones:
- Los cangrejos rey son altamente derivados de los cangrejos ermitaños que evolucionaron rápidamente una morfología similar a la del cangrejo.
- La evolución de los cangrejos rey demuestra un caso notable de evolución morfológica acelerada.
- Comprender esta transición proporciona información sobre la plasticidad evolutiva de los crustáceos.
Videos de Conceptos Relacionados
01:33Pleiotropy
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
01:29Non-nuclear Inheritance
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
01:29Non-nuclear Inheritance
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm—such as chloroplasts and mitochondria—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
01:25Inheritance
Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...
Each gene exists in pairs, and the combination of these genes from both parents forms an individual's genotype. This genotype is a blueprint of potential traits. Examples of genotype traits...
01:23Influence of Parents and Peers on Identity
Adolescence is a pivotal period of identity formation, during which individuals begin to answer questions central to their sense of self, such as "Who am I?" and "Who do I hope to become?" Both parents and peers play critical roles in guiding adolescents through this complex developmental phase.
Parental Influence on Identity Development
Parents serve as primary guides and managers in an adolescent's life, offering support instrumental in decision-making and personal growth. This guiding role...
Parental Influence on Identity Development
Parents serve as primary guides and managers in an adolescent's life, offering support instrumental in decision-making and personal growth. This guiding role...
01:18Sources of Self-Esteem I: Family Experience
Self-esteem, a crucial component of psychological development, is significantly shaped by familial experiences. The early parent-child relationship serves as a foundational influence on a child's self-concept, with long-lasting effects extending into adolescence and adulthood.Parental Behaviors and Early Self-Esteem FormationEmpirical studies have identified four principal parental behaviors that foster healthy self-esteem in children. These include expressions of acceptance, affection, and...