Effects of predation by Hydra (Cnidaria) on cladocerans (Crustacea: Cladocera)
Por:
Rivera-De la Parra, Ligia, Sarma, S. S. S., Nandini, Sarma
Publicada:
1 ene 2016
Resumen:
Planktonic cladocerans have evolved different strategies to avoid
predation from vertebrates; these include changes in morphology,
behavior, physiology, and/or life-history traits. However, littoral
cladocerans are better adapted to avoid invertebrate predation
particularly from insect larvae by evolving morphological and
physiological adaptations. Nevertheless, this has not been proven for
some littoral predators such as Hydra. In this study, we provide
quantitative data on how Hydra affects its zooplankton prey. We studied
the predation behavior on alona glabra, Ceridodaphnia dubia, Daphnia
pulex, Daphnia cf. mendotae, Diaphanosoma birgei, Macrothrix
triserialis, Moina macrocopa, Pleuroxus aduncus, Scapholeberis kingi,
Simocephalus serrulatus, Elaphoidella grandidieri, Brachionus rubens and
Euchlanis dilatata. We also tested the indirect effect of
allelochemicals from Hydra on the demography of Daphnia cf. mendotae.
Littoral cladocerans are specially adapted to resist nematocyst
injection and discharge of toxic substances from Hydra. A significant
decrease in the population growth rate of D. cf. mendotae from 0.21 to
0.125 d(-1) was observed at Hydra densities of 2 ind. mL(-1). The role
of carapace thickness as an adaptive strategy of littoral cladocerans
against Hydra predation is discussed.
Filiaciones:
Rivera-De la Parra, Ligia:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Biol, Circuito Posgrad, Ciudad Univ, Mexico City 04510, DF, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Div Invest Posgrad, Campus Iztacala,Ave Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
Nandini, Sarma:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Div Invest Posgrad, Campus Iztacala,Ave Barrios 1, Los Reyes Iztacala 54090, Tlalnepantla, Mexico
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