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GILL MORPHOLOGY OF THE INTERTIDAL ESTUARINE CRAB CHASMAGNATHUS GRANULATUS DANA, 1851 (DECAPODA, GRAPSIDAE) IN RELATION TO HABITAT AND RESPIRATORY HABITS

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[Histological and morphometric analyses were performed on the gills of the semiterrestrial estuarine crab Chasmagnathus granulatus. Three different epithelia were recognized: (1) A thin epithelium, 2:42 ± 0:33 mum thick, which lines the whole lamellae in the three anterior gills and was assigned to respiratory functions. (2) A thick cuboidal epithelium, 6-12.5 mum thick, covering part of gills 4 and 5 and the better part of the three most posterior gills. This tissue seems to be involved in ion-regulation, since it is located in the same zones which are darkly stained with silver nitrate and possess large numbers of mitochondria, closely associated to basolateral interdigitations and abundant infoldings of the apical membrane. (3) An attenuated epithelium, 0.5-1.5 mum thick, bordering the marginal channels of all the gills. This tissue is clearly of a respiratory type and probably plays an important role during air breathing when the branchial water stores become reduced by evaporation, and the consequent gill collapse impairs both ventilation and perfusion of the central part of the lamellae. During exposure to humid air, C. granulatus is able to maintain its branchial chambers almost completely filled with water, thus keeping its gills functional in spite of little mechanical support. These adaptations for maintaining gill respiration in air allow C. granulatus to sustain high metabolic rates during emergence, with little increase in venous partial pressure of carbon dioxide.

Se realizaron estudios histologicos y morfometricos de las branquias del cangrejo semiterrestre estuarial Chasmagnathus granulatus. Se identificaron tres tipos diferentes de epitelio: (1) Un tejido delgado, de 2:42 ± 0:33 mum de altura, al cual se le atribuyen funciones respiratorias y tapiza toda la superficie de las tres branquias anteriores y parte de las posteriores. (2) Un epitelio cuboide alto de 6-12.5 mum, que cubre parte de las branquias 4 y 5 y la mayor parte de las tres branquias mas posteriores. Este tejido puede considerarse ionorregulatorio, ya que se ubica en las mismas areas que se tinen intensamente con nitrato de plata y presenta gran cantidad de mitocondrias estrechamente ligadas a interdigitaciones de la membrana basolateral y profundos repliegues de la membrana apical. (3) Un epitelio atenuado de 0.5-1.5 mum, que bordea el canal marginal en las laminillas de todas las branquias y tiene un aspecto claramente respiratorio. Este tejido posiblemente cumple un papel importante en la respiracion aerea, cuando el volumen de agua retenida en las camaras branquiales disminuye por evaporacion y consecuentemente, las laminillas de las branquias se adhieren entre si, lo cual dificulta la ventilacion y la perfusion de su porcion central. Cuando respira aire humedo C. granulatus es capaz de mantener sus camaras branquiales practicamente llenas de agua, esto permite mantener funcionales a sus branquias, que son relativamente grandes y carecen de soporte mecanico para la respiracion aerea. Estas adaptaciones para mantener la respiracion branquial en aire permiten a esta especie mantener una alta tasa metabolica durante la emersion manteniendo bajos niveles de presion de dioxido de carbono., Histological and morphometric analyses were performed on the gills of the semiterrestrial estuarine crab Chasmagnathus granulatus. Three different epithelia were recognized: (1) A thin epithelium, 2:42 ± 0:33 mum thick, which lines the whole lamellae in the three anterior gills and was assigned to respiratory functions. (2) A thick cuboidal epithelium, 6-12.5 mum thick, covering part of gills 4 and 5 and the better part of the three most posterior gills. This tissue seems to be involved in ion-regulation, since it is located in the same zones which are darkly stained with silver nitrate and possess large numbers of mitochondria, closely associated to basolateral interdigitations and abundant infoldings of the apical membrane. (3) An attenuated epithelium, 0.5-1.5 mum thick, bordering the marginal channels of all the gills. This tissue is clearly of a respiratory type and probably plays an important role during air breathing when the branchial water stores become reduced by evaporation, and the consequent gill collapse impairs both ventilation and perfusion of the central part of the lamellae. During exposure to humid air, C. granulatus is able to maintain its branchial chambers almost completely filled with water, thus keeping its gills functional in spite of little mechanical support. These adaptations for maintaining gill respiration in air allow C. granulatus to sustain high metabolic rates during emergence, with little increase in venous partial pressure of carbon dioxide.

Se realizaron estudios histologicos y morfometricos de las branquias del cangrejo semiterrestre estuarial Chasmagnathus granulatus. Se identificaron tres tipos diferentes de epitelio: (1) Un tejido delgado, de 2:42 ± 0:33 mum de altura, al cual se le atribuyen funciones respiratorias y tapiza toda la superficie de las tres branquias anteriores y parte de las posteriores. (2) Un epitelio cuboide alto de 6-12.5 mum, que cubre parte de las branquias 4 y 5 y la mayor parte de las tres branquias mas posteriores. Este tejido puede considerarse ionorregulatorio, ya que se ubica en las mismas areas que se tinen intensamente con nitrato de plata y presenta gran cantidad de mitocondrias estrechamente ligadas a interdigitaciones de la membrana basolateral y profundos repliegues de la membrana apical. (3) Un epitelio atenuado de 0.5-1.5 mum, que bordea el canal marginal en las laminillas de todas las branquias y tiene un aspecto claramente respiratorio. Este tejido posiblemente cumple un papel importante en la respiracion aerea, cuando el volumen de agua retenida en las camaras branquiales disminuye por evaporacion y consecuentemente, las laminillas de las branquias se adhieren entre si, lo cual dificulta la ventilacion y la perfusion de su porcion central. Cuando respira aire humedo C. granulatus es capaz de mantener sus camaras branquiales practicamente llenas de agua, esto permite mantener funcionales a sus branquias, que son relativamente grandes y carecen de soporte mecanico para la respiracion aerea. Estas adaptaciones para mantener la respiracion branquial en aire permiten a esta especie mantener una alta tasa metabolica durante la emersion manteniendo bajos niveles de presion de dioxido de carbono.]

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/content/journals/10.1163/156854000504110
2000-01-01
2015-05-22

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