Sessile rotifers (Rotifera) exhibit strong seasonality in a shallow, eutrophic Ramsar site in Mexico
Por:
Jiménez-Santos M.A., Sarma S.S.S., Nandini, S., Wallace, Robert L.
Publicada:
1 dic 2019
Ahead of Print:
1 nov 2019
Categoría:
Animal science and zoology
Resumen:
To better understand the sessile rotifer community of a shallow,
eutrophic lake, we monitored over a 1-year period the monthly changes in
the density and diversity of rotifers on the roots of the common water
hyacinth, Eichhornia crassipes, which served as a representative
hydrophyte. Selected physical and chemical parameters of the water were
also determined. Mean annual density of all sessile species was 630
individuals per ml. Species of Collothecacea (n = 7) were most abundant.
Of the 12 species of Flosculariaceae (Flosculariidae), Sinantherina
socialis occurred seasonally, while Ptygura beauchampi was most common
across all seasons. The Shannon-Wiener diversity index was highest (H `
= 2.8) in April, but decreased in January (H ` = 1.3). Applying the
concept of the guild ratio (functional-based analysis) we found that
raptorial species (Collothecacea) were dominant over most of the year
(June-February), while microphagous Flosculariidae were dominant during
the warm, drier season (March-May). BEST (optimal matching of biota to
environment, including stepwise search) analysis and canonical
correspondence revealed that temperature, dissolved oxygen, pH,
turbidity, and transparency strongly influenced sessile rotifer
dynamics. We also found significant correlations between the density of
some species and physicochemical variables. These species included
Collotheca ambigua, C. coronetta, C. ornata, C. campanulata, C.
tenuilobata, and Stephanoceros millsii in the Collothecacea; and
Beauchampia crucigere, Limnias melicerta, L. ceratophylli, Ptygura
crystallina, P. melicerta, and Sinantherina ariprepes in the
Flosculariidae. Our study shows that the communities of sessile rotifers
were structured by abiotic factors and that the guild ratio is useful
for understanding the relationship between sessile rotifers and their
substrata.
Filiaciones:
Jiménez-Santos M.A.:
Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico City, Mexico
Sarma S.S.S.:
Laboratory of Aquatic Zoology, National Autonomous University of Mexico, FES Iztacala, Tlalnepantla, Edo. de México, Mexico
Nandini, S.:
Laboratory of Aquatic Zoology, National Autonomous University of Mexico, FES Iztacala, Tlalnepantla, Edo. de México, Mexico
Wallace, Robert L.:
Department of Biology, Ripon College, Ripon, WI, United States
Open Access
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