Intraspecific competition and persistence in Acanthoscelides macrophthalmus (Coleoptera: Chrysomelidae): an experimental analysis in a stage-structured population Daniela M Iano, Bruno L Araújo, Marcelo N Rossi Austral Entomology, 2022 Intraspecific competition is an ecological process that can affect the structure of populations with important consequences for population persistence. In this study, we investigated (in the larval stage) the effect of intraspecific competition in the seed‐feeding beetleAcanthoscelides macrophthalmuson its population structure and persistence. By using Leslie matrices, which are useful to project future population sizes of structured populations, we conducted demographic analysis when competition was (more than one larva per seed) and was not (one larva per seed) present. The hypothesis that competition reduces the finite rate of population growth, the survival of the immatures and the fecundity of females, influencing population persistence, was tested. To understand whether intraspecific competition is a common process in this system, the oviposition pattern was also studied. We found that in the presence of competition, the larvae from the third instar were smaller than those in the absence of competition and, in the presence of competition, fewer larvae reached the adult stage. Larval survival was lower in the presence of competition, particularly from the third larval stage until the pupal stage, and the fecundity of females was also reduced in the presence of competition, which affected the population structure. Although we showed that populations may either grow geometrically or go extinct in absence and presence of competition, respectively, the finite rates of population increase did not differ from 1.0 when compared to the estimated confidence intervals. Therefore, although larval competition may affect the structure of this seed‐feeding beetle, there is no clear evidence that this ecological process can negatively affect its persistence. Furthermore, most seeds with eggs had just one egg per seed, which suggests that competition should occur with low frequency under natural conditions.
The interaction effect between intraspecific competition and seed quality on the life-history traits of the seed-feeding beetle Acanthoscelides macrophthalmus Cássia S. Cesar, Marcelo N. Rossi Entomologia Experimentalis Et Applicata, 2019 It has been shown that intraspecific competition and resource quality may affect life‐history traits of insects, such as body size, fecundity, and survival. However, intraspecific competition and resource quality may interact with each other. The study of such interacting effects is crucial for understanding the influence of these ecological variables on the selection of specific life‐history traits. Here, we investigated whether the interaction between intraspecific larval competition and variation in resource quality affects adult emergence and survival, egg size, fecundity, body size, and sexual size dimorphism (SSD) of the seed‐feeding beetleAcanthoscelides macrophthalmus(Schaeffer) (Coleoptera: Chrysomelidae: Bruchinae) when infestingLeucaena leucocephala(Lam.) De Wit (Fabaceae), its host plant. In the laboratory, beetles were reared on seeds that differed in quality (e.g., different hardness, seed size, water content), in the presence or absence of larval competition. Body size and SSD did not differ between treatments (with and without competition), nor were they affected by varying resource quality. Females subjected to competition during the larval stage and females emerging from seeds of higher quality, displayed the highest fecundity. The proportion of emergent adults was higher in the absence of competition. In addition, larger eggs were laid on the low‐quality resource in the absence of competition, showing a trade‐off between egg size and egg number. Adult survival differed among treatments and resource qualities, suggesting a higher investment in adult survival for individuals emerging from seeds of low quality in the presence of competition. Whether changes in specific traits could be selected for in detriment of others will depend on the strength of intraspecific competition, the variation in resource quality, and the plasticity in the life‐history traits investigated. This needs further clarification.
Testing rensch’s rule in Acanthoscelides macrophthalmus, a seed-feeding beetle infesting Leucaena leucocephala plants M.N. Rossi, E.B. Haga Canadian Journal of Zoology, 2019 Rensch’s rule states that males vary more in size than females when body size increases. The main cause of Rensch’s rule has been credited to sexual selection. However, different degrees of plasticity between the sexes have also been proven to be useful for describing variations in sexual size dimorphism, particularly within an intraspecific context. For insects, in general, this rule has rarely been tested within species. Here, we tested whether Acanthoscelides macrophthalmus (Schaeffer, 1907) (Coleoptera: Chrysomelidae: Bruchinae) followed Rensch’s rule when individuals emerged from seeds immediately after fruit collection and when they were reared for one generation, by measuring three morphological traits. Rensch’s rule was not followed for any of the morphological traits. Variations in body size were similar in males and females for bruchines that first emerged from seeds and for those that were reared for one generation. These findings suggest that environmental conditions (e.g., temperature, humidity, and seasonality) are unlikely to drive differential plasticity in males and females of this seed-feeding beetle. It is possible that changes in the body size of A. macrophthalmus have a genetic basis. However, regardless of whether variations in body size have a genetic basis, our findings provide no support for Rensch’s rule.
Intraspecific variation in body size and sexual size dimorphism, and a test of Rensch's rule in bats Carina M. V. Ulian, Marcelo N. Rossi Acta Zoologica, 2017 The magnitude and direction of sexual size dimorphism (SSD) may vary considerably within and among taxa, and the primary causes of such variation have not been thoroughly elucidated. For example, the effect of abiotic factors is frequently attributed to explain intra‐ and interspecific variation in SSD. Rensch's rule, which states that males vary more in size than females when body size increases, has rarely been tested in bats. Therefore, whether bats follow Rensch's rule remains unclear, particularly when females are larger than males. We investigated whether four bat species presented SSD, as well as whether their body sizes varied within each sex across localities, testing the hypothesis that intraspecific SSD varies substantially depending of sampling localities. We finally examined whether bats followed Rensch's rule by simultaneously using intraspecific and interspecific approaches. Although SSD was not observed for most bat species within each locality, the females of three of the four captured species exhibited differences in body size between particular localities. Usually the females varied more in size than did males across localities, mostly exhibiting a female‐biased SSD. Significant differences in SSD were observed (i.e. mean values of the sexual dimorphism index), even though Rensch's rule was not followed.
Geographic distribution, large-scale spatial structure and diversity of parasitoids of the seed-feeding beetle Acanthoscelides macrophthalmus A. Wood, E.B. Haga, V.A. Costa, M.N. Rossi Bulletin of Entomological Research, 2017 Bruchine beetles are highly host-specific seed feeders during the larval stage. Although some specific parasitoid families have been recorded attacking bruchine beetles, most studies have been done at small spatial scales. Therefore, the current knowledge about the diversity and the geographic distribution of parasitoid species parasitizing bruchines is scarce, especially at a wide geographic area that extends over large distances through a latitudinal cline (i.e. large-scale spatial structure). The present study determined the species richness and evenness of parasitoids attacking the bruchine beetleAcanthoscelides macrophthalmusfeeding onLeucaena leucocephalaseeds, examined their geographic distribution, and characterized the large-scale spatial structure in parasitoid species composition. A total of 1420 parasitoids (all Hymenoptera) belonging to four families, five subfamilies and eight species were collected (genera:Horismenus, Paracrias, Urosigalphus, Stenocorse, Chryseida, Eupelmus). Most parasitoid species showed wide spatial distribution, high evenness in species abundance and the species richness estimators were close to stabilization (approximately eight species). Overall, greater similarity was observed in the species composition of plant populations near to each other than those farther apart, revealing a large-scale spatial structure in parasitoid species composition.
Variation in body size and sexual size dimorphism in a seed-feeding beetle: testing the effect of seed quality over two generations without larval competition MN Rossi, EB Haga, A Wood, BCA Nunes, RF Contente Arthropod-Plant Interactions 19 (5), 68 , 2025 2025 Citations: 1
Ecological and biological aspects of a leaf miner on Erythroxylum tortuosum (Mart.)(Erythroxylaceae) in a Cerrado fragment in Southeastern Brazil MN Ishino, PR De Sibio, MN Rossi Tropical Lepidoptera Research, 90-96 , 2023 2023
Investigating spatiotemporal patterns, spatial density dependence and fruit quality in a plant-bruchine-parasitoids system MN Rossi, LMS Rodrigues Écoscience 30 (2), 130-146 , 2023 2023 Citations: 2
Phenotypic plasticity in Acanthoscelides quadridentatus (Coleoptera: Chrysomelidae) and its effect on the seed fate of Mimosa setosa (Leguminosae: Mimosoideae) B de Sousa‐Lopes, MN Rossi, K Del‐Claro Ecological Entomology 47 (5), 728-735 , 2022 2022 Citations: 2
Intraspecific competition and persistence in Acanthoscelides macrophthalmus (Coleoptera: Chrysomelidae): an experimental analysis in a stage‐structured … DM Iano, BL Araujo, MN Rossi Austral Entomology 61 (1), 86-96 , 2022 2022 Citations: 3
The interaction effect between intraspecific competition and seed quality on the life‐history traits of the seed‐feeding beetle Acanthoscelides macrophthalmus CS Cesar, MN Rossi Entomologia Experimentalis et Applicata 167 (12), 986-999 , 2019 2019 Citations: 6
When a seed-feeding beetle is a predator and also increases the speed of seed germination: an intriguing interaction with an invasive plant AV da Silva, MN Rossi Evolutionary Ecology 33 (2), 211-232 , 2019 2019 Citations: 19
Testing Rensch’s rule in Acanthoscelides macrophthalmus , a seed-feeding beetle infesting Leucaena leucocephala plants MN Rossi, EB Haga Canadian Journal of Zoology 97 (4), 304-311 , 2019 2019 Citations: 5
Intraspecific variation in body size and sexual size dimorphism, and a test of Rensch's rule in bats CMV Ulian, MN Rossi Acta Zoologica 98 (4), 377-386 , 2017 2017 Citations: 14
Geographic distribution, large-scale spatial structure and diversity of parasitoids of the seed-feeding beetle Acanthoscelides macrophthalmus A Wood, EB Haga, VA Costa, MN Rossi Bulletin of Entomological Research 107 (3), 322-331 , 2017 2017 Citations: 16
Trade-off entre crescer, reproduzir e defender: uma análise experimental do barbatimão e os insetos associados aos seus frutos JT Mendes, LDB Faria, FF Coelho, MFGV Peñaflor, MN Rossi, ... 2017
Dinâmica de interações tróficas em frutos de Piptadenia gonoacantha (Mart.) Macbr.(Fabaceae: Mimosoideae) TM Silva, LDB Faria, LCP Silveira, MN Rossi, MFGV Peñaflor 2017
The effect of seed traits on geographic variation in body size and sexual size dimorphism of the seed‐feeding beetle Acanthoscelides macrophthalmus EB Haga, MN Rossi Ecology and Evolution 6 (19), 6892-6905 , 2016 2016 Citations: 22
Interaction effect between herbivory and plant fertilization on extrafloral nectar production and on seed traits: An experimental study with Ricinus communis (Euphorbiaceae) PR De Sibio, MN Rossi Journal of economic entomology 109 (4), 1612-1618 , 2016 2016 Citations: 2
Interaction between trophobiont insects and ants: the effect of mutualism on the associated arthropod community JD de Freitas, MN Rossi Journal of insect conservation 19 (4), 627-638 , 2015 2015 Citations: 27
Frugivory and the effects of ingestion by bats on the seed germination of three pioneering plants MC de Carvalho-Ricardo, W Uieda, RCB Fonseca, MN Rossi Acta oecologica 55, 51-57 , 2014 2014 Citations: 38
Caracterização e efeito de cascata trófica em uma rede multi-trófica: de fatores abióticos do solo a insetos associados a frutos JT Mendes, LDB Faria, JNC Louzada, MN Rossi 2013
The extent of seed predation by bruchine beetles (Coleoptera: Chrysomelidae: Bruchinae) in a heterogeneous landscape in southeastern Brazil LMS Rodrigues, JH Viana, CS Ribeiro-Costa, MN Rossi The Coleopterists Bulletin 66 (3), 271-279 , 2012 2012 Citations: 28
Edge effect and phenology in Erythroxylum tortuosum (Erythroxylaceae), a typical plant of the Brazilian Cerrado MN Ishino, PR De Sibio, MN Rossi Brazilian Journal of Biology 72 (3), 587-594 , 2012 2012 Citations: 16
Oviposition of a leaf-miner on Erythroxylum tortuosum (Erythroxylaceae) leaves: hierarchical variation of physical leaf traits PR De Sibio, MN Rossi Australian Journal of Botany 60 (2), 136-142 , 2012 2012 Citations: 15
MOST CITED SCHOLAR PUBLICATIONS
Larval dispersal and predation in experimental populations of Chrysomya albiceps and Cochliomyia macellaria (Diptera: Calliphoridae) JB Andrade, FA Rocha, P Rodrigues, GS Rosa, LDB Faria, CJ Von Zuben, ... Memórias do Instituto Oswaldo Cruz 97, 1137-1140 , 2002 2002 Citations: 58
Predaceous ant fauna in new sugarcane fields in the state of São Paulo, Brazil MN Rossi, HG Fowler Brazilian Archives of Biology and Technology 47, 805-811 , 2004 2004 Citations: 53
Effects of the seed predator Acanthoscelides schrankiae on viability of its host plant Mimosa bimucronata CA Tomaz, D Kestring, MN Rossi Biological Research 40 (3), 281-290 , 2007 2007 Citations: 52
Frugivory and the effects of ingestion by bats on the seed germination of three pioneering plants MC de Carvalho-Ricardo, W Uieda, RCB Fonseca, MN Rossi Acta oecologica 55, 51-57 , 2014 2014 Citations: 38
Imbibition phases and germination response of Mimosa bimucronata (Fabaceae: Mimosoideae) to water submersion D Kestring, J Klein, LCCR de Menezes, MN Rossi Aquatic Botany 91 (2), 105-109 , 2009 2009 Citations: 36
A preliminary investigation of pre-dispersal seed predation by Acanthoscelides schrankiae Horn (Coleoptera: Bruchidae) in Mimosa bimucronata (DC.) Kuntze trees LA Silva, R Maimoni-Rodella, MN Rossi Neotropical Entomology 36, 197-202 , 2007 2007 Citations: 34
Relationship Among Phenolic Contents, Seed Predation, and Physical Seed Traits in Mimosa bimucronata Plants D Kestring, LCCR Menezes, CA Tomaz, GPP Lima, MN Rossi Journal of Plant Biology 52 (6), 569-576 , 2009 2009 Citations: 31
The extent of seed predation by bruchine beetles (Coleoptera: Chrysomelidae: Bruchinae) in a heterogeneous landscape in southeastern Brazil LMS Rodrigues, JH Viana, CS Ribeiro-Costa, MN Rossi The Coleopterists Bulletin 66 (3), 271-279 , 2012 2012 Citations: 28
Interaction between trophobiont insects and ants: the effect of mutualism on the associated arthropod community JD de Freitas, MN Rossi Journal of insect conservation 19 (4), 627-638 , 2015 2015 Citations: 27
Ant predation of larval Diatraea saccharalis Fab. (Lep., Crambidae) in new sugarcane in Brazil MN Rossi, HG Fowler Journal of Applied Entomology 124 (5‐6), 245-247 , 2000 2000 Citations: 26
Bottom-up and top-down effects in a pre-dispersal seed predation system: are non-predated seeds damaged? LCCR De Menezes, J Klein, D Kestring, MN Rossi Basic and Applied Ecology 11 (2), 126-134 , 2010 2010 Citations: 24
Manipulation of fire ant density, Solenopsis spp., for short-term reduction of Diatraea saccharalis larval densities in Brazil MN Rossi, HG Fowler Scientia Agricola 59 (2), 389-392 , 2002 2002 Citations: 24
Oviposition pattern and within-season spatial and temporal variation of pre-dispersal seed predation in a population of Mimosa bimucronata trees MN Rossi, LM da Silva Rodrigues, MN Ishino, D Kestring Arthropod-Plant Interactions 5 (3), 209-217 , 2011 2011 Citations: 23
The effect of seed traits on geographic variation in body size and sexual size dimorphism of the seed‐feeding beetle Acanthoscelides macrophthalmus EB Haga, MN Rossi Ecology and Evolution 6 (19), 6892-6905 , 2016 2016 Citations: 22
The Effect of Refuge on Dermestes ater (Coleoptera: Dermestidae) Predation on Musca domestica (Diptera: Muscidae): Refuge for Prey or the Predator? LCCR Menezes, MN Rossi, WAC Godoy Journal of insect behavior 19 (6), 717-729 , 2006 2006 Citations: 21
Consequences of refuge for the functional response of Dermestes ater (Coleoptera: Dermestidae) to Musca domestica (Diptera: Muscidae) LCCR Menezes, MN Rossi, C Reigada Population Ecology 47 (3), 213-219 , 2005 2005 Citations: 20
When a seed-feeding beetle is a predator and also increases the speed of seed germination: an intriguing interaction with an invasive plant AV da Silva, MN Rossi Evolutionary Ecology 33 (2), 211-232 , 2019 2019 Citations: 19
Leaf trait variation on Erythroxylum tortuosum (Erythroxylaceae) and its relationship with oviposition preference and stress by a host‐specific leaf miner MN Ishino, PR De Sibio, MN Rossi Austral Ecology 36 (2), 203-211 , 2011 2011 Citations: 18
Geographic distribution, large-scale spatial structure and diversity of parasitoids of the seed-feeding beetle Acanthoscelides macrophthalmus A Wood, EB Haga, VA Costa, MN Rossi Bulletin of Entomological Research 107 (3), 322-331 , 2017 2017 Citations: 16
Edge effect and phenology in Erythroxylum tortuosum (Erythroxylaceae), a typical plant of the Brazilian Cerrado MN Ishino, PR De Sibio, MN Rossi Brazilian Journal of Biology 72 (3), 587-594 , 2012 2012 Citations: 16