The Combined Effects of Food and Temperature on the Life History Parameters of Brachionus patulusMULLER (Rotifera)

Abstract

The Combined Effects of Food and Temperature on the Life History Parameters of Brachionus patulus MULLER (Rotifera) key worda: Rotifera, Brachionw patulus, food, temperature, life history parameters AbstractThe combined effects of different levels of temperature (15". 25" and 35 "C) and food Chlorella (1,2 and 4 x 106 cells/ml) on the life history parameters (lifespan, life expectancy, net reproductive rate, intrinsic rate of increase, developmental time, and generation time) of a laboratory population of the rotifer Brachionus patulua were investigated. Both food and temperature, independently and in interaction, significantly influenced nearly all the parameters. The reproductive performance was a direct function of the food level, but the magnitude of food effect was temperature-dependent. The observed temperature x food interaction effects are explained in terms of the energetics of resource apportionment between metabolism and reproduction. 252 226 226 229 231 231 232 235 235 237 238 238

Effect of Single Species or Mixed Algal (Chlorella vulgaris andScenedesmus acutus) Diets on the Life Table Demography ofBrachionus calyciflorus andBrachionus patulus (Rotifera: Brachionidae)

“…In the present study, these values were lower but, under comparable conditions, were close to 7 days. Similarly, the gross and net reproductive rates observed in our study were lower but within the range documented earlier [26]; the rate of population increase observed here was much closer to that reported earlier (0.32 d Ϫ1 [15]). Much of the data on the life table demography of B. calyciflorus given in the literature is not readily comparable to our work because of the use of different growth conditions in relation to algal species, densities, incubation temperatures and other test conditions.…”

“…Regardless of the differences associated with the algal types or their combinations, both of the rotifer species studied had life history variables within a range reported earlier for these species in the literature. Sarma, Rao [26] have cultured B. patulus using three Chlorella densities (1 · 10 6 cells mL Ϫ1 , 2 · 10 6 cells mL Ϫ1 and 4 · 10 6 cells mL Ϫ1 ) and at three temperatures (15°C, 25°C and 35°C). The average lifespan values varied from 8 to 14 days, depending on the test conditions.…”

“…This density has also been used for many rotifer species in experimental studies (B. patulus: [26]; B. calyciflorus: [34]; B. macracanthus: [19]). The use of mixed algal diets for culturing rotifers is reported under freshwater [38] and marine [39] conditions.…”

Demography and feeding behavior of Stenostomum leucops (Dugés, 1828)

“…The energy designated for reproduction depends on the amount of food available and consumed (Sarma and Rao, 1991) which, in turn, depends on the vulnerability of the prey. Vulnerability is affected by characteristics such as size, presence of spines, swimming behavior, etc.…”

Interaction of changes in food quality and temperature reveals maternal effects on fitness parameters of a keystone aquatic herbivore

“…The interaction between effects of food quantity and temperature has been studied extensively in Daphnia (Orcutt and Porter 1984;Giebelhausen and Lampert 2001), especially in relation to temperature and food gradients in stratified lakes (Stich and Lampert 1984;Kessler and Lampert 2004), and a variety of other organisms from rotifers (Sarma and Rao 1991) to fish (Cuenco et al 1985). There are far fewer studies dealing with the interaction between food quality and temperature, which has only recently come into focus (Masclaux et al 2009;Sperfeld and Wacker 2009;Persson et al 2011).…”