کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1974190 1060342 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Damage to the gills and integument of Litoria fallax larvae (Amphibia: Anura) associated with ionoregulatory disturbance at low pH
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Damage to the gills and integument of Litoria fallax larvae (Amphibia: Anura) associated with ionoregulatory disturbance at low pH
چکیده انگلیسی

In fish, exposure to waters of low pH causes significant damage to the gill resulting in fatal iono- and osmoregulatory disturbance. In amphibians, exposure to acid waters also disrupts ionic homeostasis, however the extent and nature of injuries to amphibian larvae from acid exposure are poorly understood. Changes in gross morphology and ultrastructure of the gills and integument were examined, together with measures of Na+ efflux/uptake, in larval Litoria fallax (Amphibia: Anura) following acute acid exposure. Examination of tissues revealed significant changes in morphology and ultrastructure of both gills and the integument following acutely lethal exposure to low pH water. Changes to the gills of acid-exposed L. fallax larvae included lifting of the branchial epithelium and opening of tight junctions between pavement cells (with a consequent reduction in tight junction length). Damage to epithelial cell–cell tight junctions was also apparent at the integument along with widespread oncosis and localised epithelial necrosis. Mucous secretory activity at the gills and body surface was largely unaffected by acid exposure, with little or no difference in density, cross-sectional area and number of epithelial mucous secretory vesicles in acid-exposed and control larvae. Changes in morphology and ultrastructure at low pH were accompanied by significant Na+ loss (up to 50% of the total body Na+ content) attributable in large part to increased paracellular ionic efflux across the gills as well as increased transcellular and paracellular efflux of ions across the integument.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology - Volume 155, Issue 2, February 2010, Pages 164–171
نویسندگان
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