Larval diets of two anuran species, Pelodytes punctatus and Bufo bufo, in SW Spain

1989 ◽  
Vol 10 (1) ◽  
pp. 71-75 ◽  
Author(s):  
Carmen Diaz-Paniagua
Keyword(s):  
Water Column ◽  
Bufo Bufo ◽  
Sw Spain ◽  
Anuran Species

AbstractDiets of both species studied were basically composed of algae and detritus. For Pelodytes punctatus, other food types exhibited minor contributions to the diet. For Bufo bufo, phanerogams reached considerable proportions too and the frequency of animals may be considered noteworthy if related to other species in the area. Morphologically they seem to be both conditioned to bottom dwelling rather than to the use of water column.

scholarly journals Ammonia as a Pheromone in Anuran Tadpoles

2011 ◽  
pp. S185-S191 ◽  
Author(s):  
Y. B. MANTEIFEL ◽  
E. I. KISELEVA
Keyword(s):  
Laboratory Experiments ◽  
Rana Temporaria ◽  
Ammonia Concentration ◽  
Bufo Bufo ◽  
Differential Sensitivity ◽  
Differential Threshold ◽  
Background Concentration ◽  
Rana Arvalis ◽  
Anuran Species ◽  
Avoidance Reactions

In laboratory experiments, conspecific excretions and ammonia solutions evoked avoidance reactions in tadpoles of three anuran species, Bufo bufo, Rana temporaria, and Rana arvalis. A differential sensitivity of ammonia chemoreception was determined for two anuran species. For Bufo bufo tadpoles, these characteristics at ammonia background concentration of 0.2 mg/l lied in the range 150 % < dI/I < 500 %, and for background of 0.4 mg/l the value lied in the range 400 % < dI/I < 500 %. For Rana temporaria tadpoles, differential threshold against ammonia background concentration of 0.15 mg/l was close to 200 % and against background ammonia concentration of 1.1 mg/l was close to 100 %. These results suggest that such sensitivity of both anurans is sufficient for using ammonia in intra- and interspecies communication.

Larval Diets related to Morphological Characters of five Anuran Species in the Biological Reserve of Doñana (Huelva, Spain)

1985 ◽  
Vol 6 (4) ◽  
pp. 307-321 ◽  
Author(s):  
Carmen Diaz-Paniagua
Keyword(s):  
Water Column ◽  
Morphological Characters ◽  
Body Form ◽  
Anuran Species ◽  
Discoglossus Pictus ◽  
Bufo Calamita ◽  
Biological Reserve ◽  
Pelobates Cultripes ◽  
Rana Perezi

AbstractThe diets of the larvae of five anuran species are described (Discoglossus pictus, Bufo calamita, Hyla meridionalis, Pelobates cultripes and Rana perezi). They all are basically composed of three abundant categories of food: algae, detritus and phanerogams. Other rarely encountered food categories are pollen, fungi, animals, bacteria and protozoa. A classification can be deduced by relating the use of the space in the ponds, diets and several morphological characters of larvae of each species: a) bottom-dwellers —tadpoles with a depressed body form which feed mainly on detritus — b) water column users — tadpoles with larger dorsal tail crests and tail surfaces which feed mainly on algae and phanerogams.

The development of a radio tracking system for anuran species

1981 ◽  
Vol 2 (2) ◽  
pp. 107-116 ◽  
Author(s):  
G.J. van Nuland ◽  
P.F.H. Claus
Keyword(s):  
Tracking System ◽  
Field Tests ◽  
Bufo Bufo ◽  
Radio Tracking ◽  
Anuran Species ◽  
Electrical Engineers ◽  
Telemetric System

AbstractA telemetric system suitable for radio tracking anuran species is described. Its characteristics are given in detail, which will enable electrical engineers to construct the various elements. The system proved to be successful in field tests with Bufo bufo bufo L.

Temporal segregation in larval amphibian communities in temporary ponds at a locality in SW Spain

1988 ◽  
Vol 9 (1) ◽  
pp. 15-26 ◽  
Author(s):  
Carmen Diaz-Paniagua
Keyword(s):  
Bufo Bufo ◽  
Early Summer ◽  
Climatic Conditions ◽  
Temporary Ponds ◽  
Sw Spain ◽  
Amphibian Community ◽  
Drying Up ◽  
Triturus Marmoratus ◽  
Pelobates Cultripes ◽  
Rana Perezi

AbstractThe amphibian community of the Biological Reserve of Doñana (SW Spain) is composed of 10 species, their period of larval occurrence commonly taking place from autumn to early summer, although it may vary from year to year in relation to the flooding conditions of ponds. A segregation is observed according to temporal use of temporary ponds by larvae of different species. Pelobates cultripes and Discoglossus galganoi tadpoles occur in ponds during their whole persistence, from flooding to drying up. Hyla meridionalis, Triturus marmoratus and Triturus boscai larvae commonly exploit a shorter temporal range, appearing about two months later until early summer. Bufo bufo, Bufo calamita and normally also Rana perezi have the shortest larval periods, of about two months. Rana perezi is also characterized by its delay in temporal use of the ponds in comparison with the other species. The flexibility of the larval period season is considered an adaptation to the unpredictability of temporary ponds. Thus, under certain climatic conditions, the two first groups of species may occur in the same temporal range.

Comparison of the performance of oscillating water column devices based on arrangements of water columns

2020 ◽  
Vol 14 (3) ◽  
pp. 7082-7093
Author(s):  
Jahirwan Ut Jasron ◽  
Sudjito Soeparmani ◽  
Lilis Yuliati ◽  
Djarot B. Darmadi
Keyword(s):  
Wave Propagation ◽  
Water Column ◽  
Water Depth ◽  
Graphical Form ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Power Absorption ◽  
Water Columns ◽  
Single Column ◽  
Parallel Arrangement

The hydrodynamic performance of oscillating water column (OWC) depends on the depth of the water, the size of the water column and its arrangement, which affects the oscillation of the water surface in the column. An experimental method was conducted by testing 4 water depths with wave periods of 1-3 s. All data recorded by the sensor is then processed and presented in graphical form. The research focused on analyzing the difference in wave power absorption capabilities of the three geometric types of OWC based on arrangements of water columns. The OWC devices designed as single water column, the double water column in a series arrangement which was perpendicular to the direction of wave propagation, and double water column in which the arrangement of columns was parallel to the direction of wave propagation. This paper discussed several factors affecting the amount of power absorbed by the device. The factors are the ratio of water depth in its relation to wavelength (kh) and the inlet openings ratio (c/h) of the devices. The test results show that if the water depth increases in the range of kh 0.7 to 0.9, then the performance of the double chamber oscillating water column (DCOWC) device is better than the single chamber oscillating water column (SCOWC) device with maximum efficiency for the parallel arrangement 22,4%, series arrangement 20.8% and single column 20.7%. However, when referring to c/h, the maximum energy absorption efficiency for a single column is 27.7%, double column series arrangement is 23.2%, and double column parallel arrangement is 29.5%. Based on the results of the analysis, DCOWC devices in parallel arrangement showed the ability to absorb better wave power in a broader range of wave frequencies. The best wave of power absorption in the three testing models occurred in the wave period T = 1.3 seconds.

Control of heat transfer in a geysering water column by ultrasound emission

2002 ◽  
Author(s):  
Hideo Kimoto ◽  
Takashi Fujii ◽  
Kenta Fujiwara
Keyword(s):  
Heat Transfer ◽  
Water Column
Sign in / Sign up

Export Citation Format

Share Document