Variação espacial e temporal de microcrustáceos planctônicos do lago Monte Alegre e experimentos abordando a influência da qualidade do alimento sobre o desempenho dos cladóceros

Souza, Bruno Barretto de

doi:10.11606/d.59.2015.tde-16072015-164909

Cited by 4 publications

(9 citation statements)

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“…A new structuring of species dominance, with a preponderance of copepods and a medium-sized r-strategist cladoceran (C. richardi), which is competitively superior to a larger species (D. gessneri) (Ferreira, 2013), was apparent in the last two periods. The success or recovery of some populations after the key period may be related to the ability to occupy also the littoral zone of the lake, where Chaoborus and mites are less abundant, as observed for B. tubicen (Arcifa et al, 2013;Souza, 2015). We presume that these areas are not permanent habitats, but serve to maintain a minimum population density and enable the reoccupation of the limnetic zone when conditions are more favourable, as we are observing for B. tubicen.…”

Section: Discussionmentioning

confidence: 62%

“…Bosmina can respond to changes in predation pressure by invertebrate predators with increasing size and change of some carapace structures, as reported in a review of paleolimnological studies (Korosi et al, 2013). In Lake Monte Alegre in 2011-12, the size of B. tubicen and D. ambigua was significantly larger in the warm season compared to the cool one, when Chaoborus larvae were more abundant (Souza, 2015). Carter et al (2008) observed a smaller body size of D. ambigua exposed to kairomones from a mite species, indicating that the response to predators can vary according to their type and selectivity.…”

Section: Discussionmentioning

confidence: 81%

“…In addition, other factors in the ecosystem may influence the species differently, with opposing ef-N o n -c o m m e r c i a l u s e o n l y fects, for example, predation inducing a smaller size range and competition tending to expand the size range (Quintana et al, 2015). To date, about 12 years after the greatest impact of the new predator (key period), we observe an increasing contribution of a medium-sized, r-strategist and competitively superior species (Ferreira, 2013), which can also inhabit the littoral zone of the lake where Chaoborus and mites are almost absent (Souza, 2015). At the same time, there has been a partial recovery of smallsized populations, such as Bosmina, and an increase in species richness, which is comparable to the pre-mite period.…”

Section: Conclusion and Final Remarksmentioning

confidence: 85%

“…At the same time, there has been a partial recovery of smallsized populations, such as Bosmina, and an increase in species richness, which is comparable to the pre-mite period. Successful behavioural strategies to reduce predation may have been selected, i.e., reducing the spatial overlap with the predominant predator (Souza, 2015), as well as increasing body size, which is apparently advantageous for decreasing Chaoborus predation. The ability of some species, such as B. tubicen, D. birgei and C. richardi, to occupy the littoral zone and also the uppermost layer of the water column, seems to provide protection against both invertebrate predators.…”

Section: Conclusion and Final Remarksmentioning

confidence: 99%

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A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

et al. 2015

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INTRODUCTIONLong-term studies are essential for understanding ecological processes such as the influence of stressors and are basic for modeling, but are few in number because of their inherent difficulties, including costs (Jackson and Füreder, 2006;Maberly and Elliott, 2012). In particular, long-term studies of zooplankton can reveal the influence of past factors, including management decisions (Hambright, 2008). Some causes of changes in the zooplankton that are perceptible over a longer period include alterations of abiotic factors or predator invasion (Yan et al., 2008).The factors that affect the diversity and size of zooplankton species are intriguing issues, but still subject to controversy. From the classic paper by Brooks and Dodson (1965) to recent studies, several factors have been contemplated, and temperature has emerged as the preponderant factor for explaining latitudinal differences in zooplankton body size (Gillooly and Dodson, 2000). Gillooly and Dodson compared more than 1100 lakes located between 81°N and 77°S latitude, and found that the size variation of cladoceran species was related to latitude, with smaller sizes in the tropics and the Arctic and a greater difference between the tropics and the temperate zone. According to these authors, the highest mean sizes were observed between 6°C and 8°C, declining at higher or lower temperatures. Havens et al. (2015), comparing 122 lakes located from 6° to 74°N and from 19° to 21°S, showed a relationship between size (as weight) of cladocerans and cyclopoid copepods and temperature. In contrast, Iglesias et al. (2011) suggested that predation by fish is the major factor explaining the smaller size of zooplankton in warm lakes. Hart and Bychek (2011), in their extensive review of the many factors that could potentially influence zooplankton size, addressed extrinsic factors such as temperature, food and predation, amongst others, besides intrinsic ones. The authors concluded, however, that although a general pattern may occur, different results can arise from distinct ecosystems.J. Limnol., 2015; 74(3): 606-617 ORIGINAL ARTICLE DOI: 10.4081/jlimnol.2015DOI: 10.4081/jlimnol. .1132 A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

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Section: Discussionmentioning

confidence: 62%

Section: Discussionmentioning

confidence: 81%

Section: Conclusion and Final Remarksmentioning

confidence: 85%

Section: Conclusion and Final Remarksmentioning

confidence: 99%

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A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

et al. 2015

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“…Rubenstein (1984) showed that the gerrid Gerris remigis Say remains in microhabitats with better food quality and, consequently, better reproductive capacity. In macrophyte stands of the lake, a wide variety of microhabitats can be found, that contribute to a greater diversity of invertebrates (Meschiatti and Arcifa, 2002;Cleto-Filho and Arcifa, 2006), including planktonic cladocerans and copepods (Souza, 2015). Terrestrial invertebrates are also abundant in macrophytes, such as insects that eventually fall on the water, becoming vulnerable to predation (Domingos, 2012 -personal observation).…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal distribution of gerrid (Heteroptera) and predation on microcrustaceans from a tropical shallow lake

Domingos

Arcifa

2016

Braz. J. Biol.

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Predator-prey interactions involving an aquatic insect and zooplanktonic prey of different sizes were investigated to quantify prey mortality exposed to predators. Laboratory experiments were undertaken with the young and adult gerrid Rheumatobates crassifemur to test predation and size selectivity on the cladocerans Daphnia gessneri, Ceriodaphnia richardi, and Bosmina tubicen. Population fluctuations and spatial distribution of the gerrid were also evaluated in a small and shallow Brazilian lake throughout 12 months in fortnightly samples. The insects were more abundant in the littoral (mean density 7.0 ± 1.2 ind.m -2 ) compared to the limnetic zone. The period with the highest densities was late January to June, in both zones. Predation by young instars on Daphnia and Ceriodaphnia was significant (mean ingestion rate of 1.3 ± 0.1 D. gessneri and 0.7 ± 0.1 C. richardi per predator per hour). Adult insect fed only the large-sized prey (mean ingestion rate of 1.0 ± 0.1 D. gessneri per predator per hour). Young gerrids have greater potential to prey on cladocerans than adults, and size selectivity occurred for both predators. Preference of adults by the larger prey is probably related to difficulties in manipulating smaller planktonic prey, such as Ceriodaphnia. Due to higher densities of insects in the littoral, higher predation on zooplankton in this zone is expected. This study does contribute to a better understanding of trophic interactions in tropical shallow lakes and is the first to investigate predation of a gerrid on cladocerans in laboratory experiments.Keywords: predation, gerrids, aquatic insects, zooplankton, neotropical lake.Distribuição espacial e temporal de gerrídeo (Heteroptera) e a predação sobre microcrustáceos de um lago tropical raso ResumoForam investigadas as interações predador-presa, envolvendo inseto aquático e presas zooplanctônicas de diferentes tamanhos para quantificar a mortalidade das presas expostas a predadores. Experimentos de laboratório foram realizados com jovens e adultos do gerrídeo Rheumatobates crassifemur para testar a predação e a seletividade por tamanho das espécies de cladóceros Daphnia gessneri, Ceriodaphnia richardi e Bosmina tubicen. Flutuações populacionais e a distribuição espacial do gerrídeo também foram avaliadas em um lago brasileiro pequeno e raso durante 12 meses em amostras quinzenais. Os insetos foram mais abundantes no litoral (densidade média 7,0 ± 1,2 ind.m -2 ) em comparação com a zona limnética. Maiores densidades ocorreram de fim de janeiro a junho, em ambas as zonas. A predação dos jovens foi significativa sobre Daphnia e Ceriodaphnia (taxa de ingestão média 1,3 ± 0,1 D. gessneri and 0,7 ± 0,1 C. richardi por predador por hora). Adultos predaram somente a presa maior (taxa de ingestão média 1,0 ± 0,1 D. gessneri por predador por hora). Gerrídeos jovens têm um maior potencial para predar cladóceros que os adultos, e seletividade por tamanho ocorreu para ambos. A preferência dos adultos somente pela presa maior provavelmente está relacionad...

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Microcrustaceans and predators: diel migration in a tropical lake and comparison with shallow warm lakes

Arcifa¹,

Perticarrari²,

Bunioto³

et al. 2016

Limnetica

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Microcrustaceans and predators: diel migration in a tropical lake and comparison with shallow warm lakesDiel horizontal migration (DHM) and diel vertical migration (DVM) of planktonic microcrustaceans and invertebrate predators were studied simultaneously in a tropical shallow lake. DHM was not performed, and DVM was irregularly performed by the species. DHM of microcrustaceans does not seem to replace DVM as a strategy for decreasing predation risk in this shallow lake. The invertebrate predators, the IV instar of Chaoborus brasiliensis and the water mite Krendowskia sp., were mostly limnetic, the latter undergoing a nocturnal DVM that was not evident for the chaoborid larvae because a portion of the individuals remained in the water column in the daytime. DVM of some microcrustaceans, such as Ceriodaphnia richardi, Daphnia ambigua, Daphnia gessneri, and Thermocyclops decipiens, decreased the overlap with predators. Other behaviours, such as onshore location and occupation of the uppermost layers, seem to be more effective for coping with predation by limnetic invertebrate predators. Dissolved oxygen is a counteracting factor for only the vertical distribution because its concentration is low near the bottom in summer but not in the littoral zone. The lack of DHM in this study agrees with the results of most warm shallow lakes.

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Variação espacial e temporal de microcrustáceos planctônicos do lago Monte Alegre e experimentos abordando a influência da qualidade do alimento sobre o desempenho dos cladóceros

Cited by 4 publications

References 26 publications

A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

A long-term study on crustacean plankton of a shallow tropical lake: the role of invertebrate predation

Spatial and temporal distribution of gerrid (Heteroptera) and predation on microcrustaceans from a tropical shallow lake

Microcrustaceans and predators: diel migration in a tropical lake and comparison with shallow warm lakes

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