Food habits of the Broad‐snouted Caiman (<i>Caiman latirostris</i>: Crocodylia, Alligatoridae) in northwestern Uruguay

Borteiro, Claudio; Gutiérrez, Francisco; Tedros, Marcelo; Kolenc, Francisco

doi:10.1080/01650520802507572

Cited by 46 publications

(44 citation statements)

References 17 publications

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“…Chi-square (3 x 2 comparison) test indicated no statistical difference between major diel period and the proportion of manatees with armored catfish (χ 2 = 4.634, df = 2, p = 0.0986). Willard, 1985;and Caiman latirostris;Borteiro et al, 2009), aquatic snakes (e.g., Helicops; Aguiar & Di-Beernardo, 2004), freshwater turtles (e.g., Hydromedusa tectifera; Bonino et al, 2009), the large catfishes Phractocephalus hemioliopterus and Pseudoplatystoma fasciatum and certain other predatory fishes (Nico & Taphorn, 1988;Bistoni et al, 1995;BarbarinoDuque & Winemiller, 2003).…”

mentioning

confidence: 99%

Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys) associated with wintering Florida manatees (Trichechus manatus latirostris)

Nico¹

2010

Neotrop. ichthyol.

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Several Pterygoplichthys species, members of the Neotropical catfish family Loricariidae, have been widely introduced outside their native ranges. In this paper, I present observations on the diel activity pattern of non-native Pterygoplichthys, tentatively identified as P. disjunctivus, with respect to their attachment and grazing on endangered Florida manatees, Trichechus manatus latirostris. The study was conducted in December 2009 at Volusia Blue Spring, an artesianal spring system in the St. Johns River basin, Florida (USA). Supplemented by information gathered during previous visits to the spring site, this study revealed that adult Pterygoplichthys are active throughout the diel period (day, twilight and night). However, juvenile Pterygoplichthys were largely nocturnal and only at night did they consistently join adults in attaching to manatees. The juveniles generally remain hidden during the day, probably responding to presence of diurnal predators, mainly birds. Differences in diel behaviors among different Pterygoplichthys size classes in Florida are consistent with published observations on loricariids inhabiting clearwater streams within their native ranges.Várias espécies de Pterygoplichthys, siluriformes Neotropicais da família Loricariidae, tem sido largamente introduzidos além de suas áreas naturais de ocorrência. Neste artigo, eu apresento observações dos padrões de atividade diária de uma população não nativa de Pterygoplichthys, identificada tentativamente como P. disjunctivus, associados com a espécie ameaçada de peixe-boi nativa da Flórida, Trichechus manatus latirostris. O estudo foi conduzido em dezembro de 2009 em Volusia Blue Spring um sistema artesiano na bacia do rio St. John, Flórida (USA). Suplementado por informações reunidas durante visitas prévias ao sítio em análise, este estudo revelou que Pterygoplichthys adultos estiveram ativos durante a maioria dos períodos (dia, crepúsculo e noite). No entanto, jovens foram principalmente noturnos e somente a noite eles uniram-se aos adultos sobre os peixes-boi. No sistema estudado na Flórida, jovens de Pterygoplichthys geralmente permanecem escondidos durante o dia, provavelmente respondendo a presença de predadores visuais diurnos, principalmente aves. As diferenças observadas na atividade diária entre diferentes classes de tamanho são semelhantes ao descrito para certos loricariídeos que habitam cursos d'água de águas límpidas em suas áreas nativas de ocorrência.

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confidence: 99%

Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys) associated with wintering Florida manatees (Trichechus manatus latirostris)

Nico¹

2010

Neotrop. ichthyol.

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“…Other studies have suggested that prawns are essentially omnivorous (Walker 2009) and have an important role as shredders in tropical waters (Rosemond et al 1998). In addition, numerous studies have indicated that the freshwater prawns and crabs are important components of the diets of fishes, reptiles, birds and mammals (Collins et al 2006, Borteiro et al 2009.…”

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confidence: 99%

Trophic ecology of the freshwater prawn, <i>Pseudopalaemon bouvieri</i> (Decapoda: Palaemonidae) in Northeastern Argentina, with remarks on population structure.

Carnevali

Collins

Neiff

2012

RBT

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Abstract:Freshwater decapod crustaceans are important components of food webs in these environments, but little is known about the diet of species that live in tropical waters. We studied the feeding ecology of the prawn Pseudopalaemon bouvieri and its population structure in two different areas with six lagoons, with a different composition and abundance of aquatic macrophytes. At each site of macrophytes banks, 18 prawns sample was collected with a hand net (1mm mesh size) from 1m². In the laboratory, prawns cephalothorax length was measured, sex determined, and a total of 208 stomachs were examined for food items. Our results showed that the population abundance varied between 10 ind/m 2 and 1 411 ind/m 2 . The cephalothorax length ranged between 6mm and 21mm, and the male:female ratio varied between 0.3 and 1.0, with a higher proportion of ovigerous females (21%) in area one than area two. P. bouvieri is omnivorous, and its diet was principally based on algae, plant remains, Protozoa, Rotifera, Oligochaeta, Crustacea, Insecta, detritus and other items. The analysis of the stomach content did not reveal any significant difference in the diet between juveniles and adults, and males and females of both areas consumed a similar diet (Kruskal-Wallis test p=0.8273). We concluded that the dietary items consumed by prawns and the niche breadth were similar between the two areas, although the proportion of items consumed varied between lagoons of both areas. The density of P. bouvieri was different between areas, but the size of cephalothorax (CL) was similar. Rev. Biol. Trop. 60 (1): 305-316. Epub 2012 March 01.

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“…By this period in their lives, C. yacare starts to include small vertebrates in their diet (Santos et al 1996). Anurans are frequent, but not abundant in the diet of C. yacare and C. latirostris (Borteiro et al 2009;Santos et al 1996). This is because C. yacare, like other crocodilians, presents very opportunistic behavior regarding prey capture, while its feeding behavior is highly dependent on the environment and on prey availability (Magnusson et al 1987;Santos et al 1996;da Silveira and Magnusson 1999;Wallace and Leslie 2008).…”

Section: Discussionmentioning

confidence: 95%

“…Since C. yacare and C. latirostris caimans are generalist and opportunistic foragers (Santos et al 1996;da Silveira and Magnusson 1999;Borteiro et al 2009), it is assumed that the transmission of H. caimani to caimans occurs by the ingestion of both infected mosquitoes and paratenic hosts. However, mosquitoes are not typically eaten by C. yacare and C. latirostris, thus the likely transmission route in the natural environment would include paratenic hosts such as anurans (Lainson et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Anurans as paratenic hosts in the transmission of Hepatozoon caimani to caimans Caiman yacare and Caiman latirostris

et al. 2011

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Prevalence of Hepatozoon caimani has been reported in 76% of caimans Caiman yacare from the Pantanal region. Culex (Melanoconion) spp. mosquitoes were recently identified as natural vectors of this parasite. However, culicids are not typically eaten by crocodilians, suggesting that the main transmission route is through ingestion of insectivorous vertebrates, such as anurans. The susceptibility of wild frogs Leptodactylus chaquensis, Leptodactylus podicipinus and Scinax nasicus to infection by H. caimani was verified. Wild-caught anurans were force fed with sporulated oocysts from laboratory-bred Culex (Melanoconion) mosquitoes. Frogs were killed 30 days postinfection, and their internal organs were fed to caimans C. yacare and Caiman latirostris. Cystozoites were identified in fresh liver impression smears of L. chaquensis. C. yacare fed on anuran organ presented gametocytes in peripheral blood circulation between 74 and 80 days postinoculation (dpi). Gametocytes were also verified in C. latirostris fed on the internal organs of L. podicipinus and S. nasicus between 60-70 and 69-75 dpi, respectively. Since frogs used in experiment are sympatric with C. yacare and C. latirostris and may occur in the diet of these caimans, the results suggest these amphibians are paratenic hosts in the natural transmission cycle of H. caimani in Pantanal.

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Food habits of the Broad‐snouted Caiman (Caiman latirostris: Crocodylia, Alligatoridae) in northwestern Uruguay

Cited by 46 publications

References 17 publications

Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys) associated with wintering Florida manatees (Trichechus manatus latirostris)

Nocturnal and diurnal activity of armored suckermouth catfish (Loricariidae: Pterygoplichthys) associated with wintering Florida manatees (Trichechus manatus latirostris)

Trophic ecology of the freshwater prawn, <i>Pseudopalaemon bouvieri</i> (Decapoda: Palaemonidae) in Northeastern Argentina, with remarks on population structure.

Anurans as paratenic hosts in the transmission of Hepatozoon caimani to caimans Caiman yacare and Caiman latirostris

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