Thiago Izzo
Address: Thiago J. Izzo, Dr.
Universidade Federal de Mato Grosso
Departamento de Botânica e Ecologia - IB
Av. Fernando Corrêa da Costa, s/n
Cuiabá-MT
Cep: 78060-900
Universidade Federal de Mato Grosso
Departamento de Botânica e Ecologia - IB
Av. Fernando Corrêa da Costa, s/n
Cuiabá-MT
Cep: 78060-900
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Papers by Thiago Izzo
fluviales sur la rivière Juruena, en Amazonie brésilienne méridionale, d’un point de vue d’une analyse taxinomique. Nnous
avons effectué des prélèvements sur sept îles et deux localités témoins situées sur les berges continentales du fleuves. Nous
avons récoltées 41 espèces. Toutes ces espèces sont largement distribués dans la forêt amazonienne. Neuf d’entre elles n’ont
été rencontrées que sur les îles, 24 ne l’ont été que sur le continent et seulement huit sont communes aux deux entités. La
faune des Scarabaeinae coprophages insulaires est composée principalement d’éléments de forêt várzea ou de lisière, sans
représentant du genre Eurysternus, et d’éléments de forêt primaire amazonienne. Ces résultats suggèrent que trois
paramètres modèlent la composition de la faune des bousiers en milieu insulaire fluvial: inondations et perturbations
associées, compétition pour les ressources (liée à la présence de primates) et potentiel de dispersion des différentes espèces.
En fonction du contexte et de l’âge de la formation des îles, ces trois paramètres revêtent une importance relative différente
selon les espèces. L’analyse plus en profondeur de ces paramètres nécessite la description précise de la communauté étudiée
d’un point de vue taxinomique.
We evaluated the taxonomic composition of Scarabaeinae dung beetles inhabiting fluvial islands in Juruena River,
southern Brazilian Amazon.We sampled seven islands and two localities on each side of the mainland.We collected 41 species,
all of which are widely distributed in the Amazon rainforest. Nine of these were exclusive to the islands, 24 were exclusively
found on the mainland while eight species were found in both the islands and the mainland. The insular dung beetle fauna is
mainly composed of typical species of várzea forest or edge forest/gap with the absence of Eurysternus and elements of primary
forest in the Amazon. This result suggests that three main processes are shaping these communities: flooding and associated
disturbance events, resource competition (presence of primates) and differential dispersal power among species. Depending on
the context and age of island formation all these processes could have different levels of importance. Specific questions regarding
these processes requires a previous knowledge of the taxonomic composition of these communities.
as well as among the identity of the involved species. In this study, we showed that four ant species, Crematogaster brasiliensis,
Allomerus octoarticulatus, and two unidentified Azteca species can be found associated to the myrmecophite Cordia nodosa
in riparian forests in the South of Amazonia. This composition of ant-associated species is more similar in forests of Andean
Amazon than in Central Amazonia. The colonization of an ant colony on C. nodosa seems to be vital in order to decrease
herbivory, as increased the probability of a plant sets fruits. Moreover, even though we did not find significant differences in
herbivory among plants colonized by different ant species, the probability of a plant produces fruits is much lower when it
is colonized by Allomerus ants. Overall, this study shows that C. nodosa depends on ants to reproduce. However, based on
other empirical studies across the Amazon, our results also suggest that Allomerus ants can act as flower castrator, acting as a parasite over its geographic range.
fluviales sur la rivière Juruena, en Amazonie brésilienne méridionale, d’un point de vue d’une analyse taxinomique. Nnous
avons effectué des prélèvements sur sept îles et deux localités témoins situées sur les berges continentales du fleuves. Nous
avons récoltées 41 espèces. Toutes ces espèces sont largement distribués dans la forêt amazonienne. Neuf d’entre elles n’ont
été rencontrées que sur les îles, 24 ne l’ont été que sur le continent et seulement huit sont communes aux deux entités. La
faune des Scarabaeinae coprophages insulaires est composée principalement d’éléments de forêt várzea ou de lisière, sans
représentant du genre Eurysternus, et d’éléments de forêt primaire amazonienne. Ces résultats suggèrent que trois
paramètres modèlent la composition de la faune des bousiers en milieu insulaire fluvial: inondations et perturbations
associées, compétition pour les ressources (liée à la présence de primates) et potentiel de dispersion des différentes espèces.
En fonction du contexte et de l’âge de la formation des îles, ces trois paramètres revêtent une importance relative différente
selon les espèces. L’analyse plus en profondeur de ces paramètres nécessite la description précise de la communauté étudiée
d’un point de vue taxinomique.
We evaluated the taxonomic composition of Scarabaeinae dung beetles inhabiting fluvial islands in Juruena River,
southern Brazilian Amazon.We sampled seven islands and two localities on each side of the mainland.We collected 41 species,
all of which are widely distributed in the Amazon rainforest. Nine of these were exclusive to the islands, 24 were exclusively
found on the mainland while eight species were found in both the islands and the mainland. The insular dung beetle fauna is
mainly composed of typical species of várzea forest or edge forest/gap with the absence of Eurysternus and elements of primary
forest in the Amazon. This result suggests that three main processes are shaping these communities: flooding and associated
disturbance events, resource competition (presence of primates) and differential dispersal power among species. Depending on
the context and age of island formation all these processes could have different levels of importance. Specific questions regarding
these processes requires a previous knowledge of the taxonomic composition of these communities.
as well as among the identity of the involved species. In this study, we showed that four ant species, Crematogaster brasiliensis,
Allomerus octoarticulatus, and two unidentified Azteca species can be found associated to the myrmecophite Cordia nodosa
in riparian forests in the South of Amazonia. This composition of ant-associated species is more similar in forests of Andean
Amazon than in Central Amazonia. The colonization of an ant colony on C. nodosa seems to be vital in order to decrease
herbivory, as increased the probability of a plant sets fruits. Moreover, even though we did not find significant differences in
herbivory among plants colonized by different ant species, the probability of a plant produces fruits is much lower when it
is colonized by Allomerus ants. Overall, this study shows that C. nodosa depends on ants to reproduce. However, based on
other empirical studies across the Amazon, our results also suggest that Allomerus ants can act as flower castrator, acting as a parasite over its geographic range.
.
This work lists the genera of ants collected both on the ground and in the vegetation of Parque Estadual Cristalino, MT, Brazil. Also, we provided information on the number of species by genus, occurence and information about the distribution and biology.
This 5-page field guide is the first one published on our web page presenting native species of Mato Grosso State with photos showing sexual dimorphism which is a major feature of the genre and photos of 40 species that are part of the Endangered IUCN status red list (look for the orange circle under the photo number)