INVESTIGADORES
LUQUET Carlos Marcelo
artículos
Título:
Gill morphology of the intertidal estuarine crab Chasmagnathus granulata Dana, 1851 (Decapoda, Grapsidae) in relation to habitat and respiratory habits.
Autor/es:
LUQUET, C; ROSA, G; FERRARI, C; GENOVESE, G; PELLERANO, G.
Revista:
CRUSTACEANA
Editorial:
Bill
Referencias:
Lugar: Leiden; Año: 2000 vol. 73 p. 53 - 67
ISSN:
0011-216X
Resumen:
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 ·m 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 ·m 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 ·m 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 ® lled 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.Chasmagnathus granulatus. Three different epithelia were recognized: (1) A thin
epithelium, 2:42 § 0:33 ·m 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 ·m 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 ·m 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 ® lled 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.:42 § 0:33 ·m 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 ·m 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 ·m 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 ® lled 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.·m 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 ·m 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 ® lled 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.·m 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 ® lled 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.C. granulatus is able to maintain its branchial chambers almost
completely ® lled 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.C. granulatus to sustain high
metabolic rates during emergence, with little increase in venous partial pressure of carbon dioxide.