Demographic characteristics of two freshwater cyclopoid copepods in Mexico, fed a plankton diet: the native Mesocyclops longisetus Thiebaud and the invasive Mesocyclops pehpeinsis Hu
Por:
Alejandra Valencia-Vargas, Meetztli, Nandini, S., Sarma, S. S. S.
Publicada:
2 ene 2020
Resumen:
The introduction of exotic species often results in a loss of
biodiversity. Mexico has 4 invasive species of freshwater cyclopoid
copepods: Thermocyclops crassus, Mesocyclops aspericornis, M.
thermocyclopoides, and M. pehpeiensis. The Asian cyclopoid M.
pehpeiensis is now established in several lakes and rivers in Mexico,
but how it might compete with native species and potentially change the
structure of plankton communities is unknown. Some insights might be
obtained from a study of its demography compared to that of a native
species. We compared the life cycle parameters of the native Mesocyclops
longisetus and the exotic invasive species M. pehpeiensis in separate
cultures. Four treatments were set up with 2 densities of Plationus
patulus (Rotifera) individuals (1 and 4 mL(-1)) and 2 concentrations of
Scendesmus acutus (Chlorophyte) cells (0.5 x 10(6) and 1.5 x 10(6)
mL(-1)). Both species survived and reproduced in the treatment of 4
mL(-1) of P. patulus individuals + 0.5 x 10(6) mL(-1) of S. acutus
cells. Mesocyclops pehpeiensis had common characteristics in successful
invasive species: short generation time, high reproductive capacity, and
a wide dietary range. At low rotifer densities, M. pehpeiensis had a
higher population growth rate (0.12 d(-1)) compared to M. longisetus
(0.08-0.10 d(-1)). M. pehpeiensis is likely to outcompete M. longisetus,
especially under food-limited conditions, and most likely expand its
range in Mexico.
Filiaciones:
Alejandra Valencia-Vargas, Meetztli:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Mexico City, DF, Mexico
Nandini, S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Tlalnepantla De Baz, Estado De Mexic, Mexico
Sarma, S. S. S.:
Univ Nacl Autonoma Mexico, Lab Zool Acuat, Tlalnepantla De Baz, Estado De Mexic, Mexico
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