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Effect of circadian cycle and prey density on the demography of the predator Asplanchna silvestrii (Rotifera)
Author(s) -
JiménezContreras Jorge,
Sarma S. S. S.,
Nandini S.,
UrquietaOrdóñez Ariadna
Publication year - 2014
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.201301713
Subject(s) - rotifer , predation , biology , photoperiodism , zoology , population density , predator , population , reproduction , generation time , ecology , botany , demography , sociology
We studied the demographic responses (average lifespan (ALS), gross reproductive rate (GRR), net reproductive rate (NRR), generation time (GT) and the rate of population increase per day ( r ) of the predatory rotifer A. silvestrii cultured under five different durations of light conditions (L:D = 24:0, 18:6, 12:12, 6:18, and 0:24 in a 24 h cycle) and under two prey ( Plationus patulus ) densities (0.5 and 5.0 ind. mL −1 ). Our data showed that regardless of prey density, the survivorship of A. silvestrii was affected by the duration of photoperiod; the longest ALS was under complete darkness. For any given prey density, lowest GRR was recorded at 24L:0D. The NRR was lower under continuous light (24L:0D) regime. The longest GT was recorded when Asplanchna silvestrii was fed on high prey density and under total dark regime. The r ranged from 0.15 (24L:0D photoperiod in low prey density) to 0.6 day −1 (18L:6D and high prey density) and for the rest of treatments, the values remained within this range.