| Title | Abundance, composition and spatial variation in the egg bank of a tropical zooplankton community |
| Abstract | Resting eggs have important ecological roles in zooplankton communities, but characterizations of egg banks in tropical systems remain scarce. Here, we describe the abundance, composition and spatial variation in the egg bank of a tropical zooplankton community in a shallow aquatic system (Imboassica lagoon, Brazil). Due to sporadic disturbances by sandbar openings at this system, we hypothesized that the abundance and species richness close to the sandbar is lower when compared to other sites. Sediment samples were collected at four sampling stations, and the egg bank was analyzed using ex situ hatching experiments. Hatchlings from 21 rotifer and five cladoceran species were identified considering all sampling stations. The number of hatchlings at the sampling stations ranged from 14.2 (+/- 3.8 SE) to 192.8 (+/- 37.1), whereas species richness ranged from 3.6 (+/- 0.7) to 12.2 (+/- 0.5) in 100 g of wet sediment. Abundance and species richness were similar at three of the sampling stations, suggesting low spatial variations in the egg bank of shallow systems. Significantly lower values for abundance and species richness were found close to the sandbar when compared to the other sampling stations, probably as a result of local and recurrent disturbances due to artificial sandbar openings. The presence of an egg bank is a possible mechanism for facilitating the reestablishment of active populations after disturbances by sandbar openings and consequent increases in salinity at Imboassica lagoon. |
| Source | Studies on neotropical fauna and environment 46 (3), pp. 225–232 |
| Keywords | Diapauseegg bankcoastal lakesshallow lakeszooplankton |
| Journal | Studies on neotropical fauna and environment |
| Editor | Swets & Zeitlinger, Amsterdam, Paesi Bassi |
| Year | 2011 |
| Type | Articolo in rivista |
| DOI | 10.1080/01650521.2011.632672 |
| Authors | Jayme M. Santangelo; Francisco de A.; Marina Manca; Reinaldo L. Bozelli |
| Text | 204473 2011 10.1080/01650521.2011.632672 ISI Web of Science WOS 000299795300009 Diapause egg bank coastal lakes shallow lakes zooplankton Abundance, composition and spatial variation in the egg bank of a tropical zooplankton community Jayme M. Santangelo; Francisco de A.; Marina Manca; Reinaldo L. Bozelli Jayme M. Santangelo UFRRJ, Dept Ciencias Ambientais, Inst Florestas, Seropedica, RJ, Brazil; Francisco de A. Esteves, Reinaldo L. Bozelli UFRJ, Dept Ecol, Inst Biol, Rio De Janeiro, RJ, Brazil; Marina Manca CNR Inst Study Ecosyst, Verbania, Italy Resting eggs have important ecological roles in zooplankton communities, but characterizations of egg banks in tropical systems remain scarce. Here, we describe the abundance, composition and spatial variation in the egg bank of a tropical zooplankton community in a shallow aquatic system Imboassica lagoon, Brazil . Due to sporadic disturbances by sandbar openings at this system, we hypothesized that the abundance and species richness close to the sandbar is lower when compared to other sites. Sediment samples were collected at four sampling stations, and the egg bank was analyzed using ex situ hatching experiments. Hatchlings from 21 rotifer and five cladoceran species were identified considering all sampling stations. The number of hatchlings at the sampling stations ranged from 14.2 / 3.8 SE to 192.8 / 37.1 , whereas species richness ranged from 3.6 / 0.7 to 12.2 / 0.5 in 100 g of wet sediment. Abundance and species richness were similar at three of the sampling stations, suggesting low spatial variations in the egg bank of shallow systems. Significantly lower values for abundance and species richness were found close to the sandbar when compared to the other sampling stations, probably as a result of local and recurrent disturbances due to artificial sandbar openings. The presence of an egg bank is a possible mechanism for facilitating the reestablishment of active populations after disturbances by sandbar openings and consequent increases in salinity at Imboassica lagoon. 46 Published version ID_PUMA cnr.ise/2011 A0 057 Abundance, composition and spatial variation in the egg bank Abundance_composition_and_spatial_variation_in_the_egg_bank.pdf Articolo in rivista Swets Zeitlinger 0165 0521 Studies on neotropical fauna and environment Studies on neotropical fauna and environment Stud. neotrop. fauna environ. marinamarcella.manca MANCA MARINA MARCELLA TA.P04.016.004 Ecologia teorica e applicata degli ecosistemi acquatici |
