Substratum selection and feeding responses influence the demography of the sessile rotiferCupelopagis vorax(Collothecacea: Atrochidae)
Por:
Espinosa-Rodriguez, Cristian Alberto, Sarma, S. S. S., SARMA, NANDINI, Wallace, Robert L.
Publicada:
1 feb 2021
Resumen:
Larvae of the sessile rotiferCupelopagis voraxswim using their ciliated
corona, but do not feed. Once they attach to a substratum and
metamorphose into adults, they are predatory on protozoans and
micrometazoans. Here we present information on ingestion time, feeding
behaviour and food preference ofC. voraxusing protozoans and non-sessile
rotifers as prey. We also tested effects of physical, chemical and
biological stimuli on settlement ofC. voraxlarvae and, using life table
experiments, determined their survivorship and fecundity on three,
free-floating macrophytes. Ingestion time was shortest on prey species
smaller than 100 mu m. Capture/attack ratio was low forBrachionus
calyciflorus, but high forLecane inermisandPeranemasp. The
ingestion/capture ratio was lowest forOxytrichasp. and highest
forEuchlanis lyraandSquatinella lamellaris. Species that swim slowly and
close to the surface of hydrophytes (E. lyra, Lepadella patella, L.
inermis, Peranemasp.,Philodinasp. andS. lamellaris) had lower ingestion
time, higher encounter/attack ratio, and were the preferred prey in
selectivity experiments. Larval settlement was higher on macrophyte
leaves ofCeratophyllum demersum, Lemna valdiviana andWolffiellasp., but
lower onAzolla filiculoidesandWolffia columbiana. Coverslips coated with
dried extracts of macrophytes showed lower rates of larval settlement
compared to live macrophytes, as well as coverslips that had been
allowed to develop natural biofilms or were physically roughened.
Contrary to what might be expected from the settling tests, life-table
experiments showed thatW. columbianaenhanced survivorship (mean lifespan
and life expectancy) and rate of population increase, while animals
attached toWolffiellasp. had lower values for life history
characteristics. This study adds to our understanding of the impact
ofCupelopagispredation on protozoans and rotifers and the importance of
substratum selection on larval settlement, adult survival, and
reproductive potential after larval settlement.
Filiaciones:
Espinosa-Rodriguez, Cristian Alberto:
Univ Nacl Autonoma Mexico, FES Iztacala, UMF, Lab Zool Acuat, Av Barrios 1,AP 314, Tlalnepantla 54090, Estado De Mexic, Mexico
Univ Nacl Autonoma Mexico, FES Iztacala, UIICSE, Grp Invest Limnol Trop, Av Barrios 1,AP 314, Tlalnepantla 54090, Estado De Mexic, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, FES Iztacala, UMF, Lab Zool Acuat, Av Barrios 1,AP 314, Tlalnepantla 54090, Estado De Mexic, Mexico
SARMA, NANDINI:
Univ Nacl Autonoma Mexico, FES Iztacala, UMF, Lab Zool Acuat, Av Barrios 1,AP 314, Tlalnepantla 54090, Estado De Mexic, Mexico
Wallace, Robert L.:
Ripon Coll, Biol Dept, Ripon, WI USA
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