caa a22 4500 605513996 CHVBK 20210128100702.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00360-015-0914-8 doi (NATIONALLICENCE)springer-10.1007/s00360-015-0914-8 Schmitz Anke Institute for Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Poppelsdorfer Schloss, 53115, Bonn, Germany aut Functional morphology of the respiratory organs in the cellar spider Pholcus phalangioides (Arachnida, Araneae, Pholcidae) [Elektronische Daten] [Anke Schmitz] Morphometric evaluation of the lungs of male and female cellar spiders (Pholcus phalangioideus) was carried out in 2 test groups with different body masses (mean value 10.8, males, and 26.6mg, females). Males have significant higher lung volume to body mass ratios (2.49 vs. 2.13×10−3cm3g−1), which might result from the differences in body mass between sexes. Moreover, males have slightly more respiratory surface area per body mass (8.2 vs. 7.7cm2g−1) and a little bit larger morphological diffusing capacities for oxygen (9.3 vs. 8.2nmols−1g−1kPa−1) than females, but both values were not significant. Metabolic rates were measured using flow through respirometry under video tracking: the CO2 release of male and female spiders was measured. Resting rates were 1.7 (males) and 1.5nmols−1g−1 (females). Gluing of one spiracle did not influence the resting metabolic rate. Factorial scopes during stimulation to maximum metabolic rates were about 12 in intact animals, while elimination of one spiracle reduced the factorial scope to 5.2. Comparison with other araneomorph spiders strengthens the hypothesis that tracheae in spiders increase the metabolic rates of the tracheated species and do not only replace reduced lung capacity. Springer-Verlag Berlin Heidelberg, 2015 Respiratory system nationallicence Lungs nationallicence Stereology nationallicence Respirometry nationallicence Journal of Comparative Physiology B Springer Berlin Heidelberg 185/6(2015-08-01), 637-646 0174-1578 185:6<637 2015 185 360 https://doi.org/10.1007/s00360-015-0914-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00360-015-0914-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Schmitz Anke Institute for Zoology, Rheinische Friedrich-Wilhelms-University Bonn, Poppelsdorfer Schloss, 53115, Bonn, Germany aut NATIONALLICENCE 773 0- Journal of Comparative Physiology B Springer Berlin Heidelberg 185/6(2015-08-01), 637-646 0174-1578 185:6<637 2015 185 360