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13 results for “Mecistogaster”
Data from: Dispersal barriers and climate determine the geographic distribution of the helicopter damselfly Mecistogaster modesta
Species' ranges are typically constrained by the interplay of physical barriers to dispersal, environmental requirements such as suitable climatic conditions and biotic constraints such as from predation or competition. However, teasing apart the relative importance of these constraints in determining species distributions still represents a major challenge for ecologists. The Neotropical damselfly Mecistogaster modesta (Coenagrionidae: Odonata) inhabits wet and moist forests in mainland Central America and north-western South America. This habitat specialist spends its larval development exclusively in tank bromeliads, where it acts as a keystone predator within the aquatic food web. Although tank-forming bromeliads occur from the southern United States throughout most of South America, M. modesta is absent from the Caribbean islands and South America south-east of the Andes mountain chain. We employed species distribution models to explore the relative importance of physical barriers (Andes mountain range and oceanic barriers), climate (mean annual temperature and annual precipitation) and biotic interactions (competition from other bromeliad-dwelling odonates) in limiting the geographic distribution of M. modesta. We found that dispersal barriers strongly limit the geographic distribution of M. modesta. In addition, its range is restricted by low temperatures and low precipitation. Competition from other bromeliad-dwelling odonates was not important in limiting the damselfly's range. Because of the physical barriers to dispersal, M. modesta does not occupy its full potential geographic range. Specifically, our model predicted suitable habitat on the Caribbean islands and throughout most of South America, where the species is currently absent. These findings have important conservation implications, particularly as the aridification of rainforests and subsequent localised extinctions due to climate change continue. On the other hand, the species may respond to warming temperatures by tracking climate to higher elevations, with subsequent effects on naïve high-elevation bromeliad food webs. An upwards migration could also increase the probability of M. modesta overcoming the dispersal barrier presented by the Andes, enabling the damselfly to invade large areas of suitable habitat in South America.
FIGURES 29–33 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 29–33. Females of Atlantic Forest species of Mecistogaster. (29–31) Mecistogaster kesselringi sp. nov., allotype: (29) S9–10 showing ovipositor in lateral view, (30) cerci in dorsal view, (31) epiproct in dorsal view; (32–33) Mecistogaster amalia, allotype: (32) cerci in dorsal view, (33) epiproct in dorsal view.
FIGURES 27–28 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 27–28. Male cerci of Atlantic Forest species of Mecistogaster amalia, neotype. (27) cerci in dorsal view, (28) cerci in lateral view.
FIGURES 8–10 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 8–10. Males of Atlantic Forest species of Mecistogaster. (8) Mecistogaster kesselringi sp. nov., paratype: pterothorax in lateral view; (9) Mecistogaster amalia, neotype: pterothorax in lateral view; (10) Mecistogaster amalia, presumed type in Halle Museum: pterothorax in lateral view.
FIGURES 23–26 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 23–26. Males of Atlantic Forest species of Mecistogaster. (23–24) Mecistogaster amalia, specimen compared with neotype: (23) penis in ectal view, (24) penis in lateral view [part of flagellum cut to fit the image]; (25–26) Mecistogaster nordestina sp. nov., holotype: (25) penis in ectal view, (26) penis in lateral view [part of flagellum cut to fit the image].
FIGURES 17–18 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 17–18. Male genital fossa of Atlantic Forest species of Mecistogaster. (17) anterior hamuli with alula, (18) anterior hamuli without alula. The alula is indicated with a black arrow.
FIGURE 3 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURE 3. Records of the neotype Mecistogaster amalia and of the new Mecistogaster species from the Brazilian Atlantic Forest throughout the years (1927-2017), according to the information presented on the labels of the specimens studied.
FIGURE 2 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURE 2. Distribution map of species of Mecistogaster recorded in the Brazilian Atlantic Forest. Abbreviations for Brazilian States: Alagoas (AL), Bahia (BA), Espírito Santo (ES), Minas Gerais (MG), Paraná (PR), Paraíba (PB), Pernambuco (PE), Rio de Janeiro (RJ), Rio Grande do Sul (RS), Santa Catarina (SC), São Paulo (SP).
FIGURE 1 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURE 1. Penis of Mecistogaster (neotype M. amalia) in lateral view: aif—apex of inner fold; f—flagellum; pll—plate-like lateral lobe; s—spine; tf—terminal fold.
FIGURES 4–7 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 4–7. Males of Atlantic Forest species of Mecistogaster. (4) Mecistogaster amalia, specimen compared with neotype: head in dorso-anterior view; (5–6) Mecistogaster mielkei sp. nov., holotype: (5) prothorax in dorsal view; paratype: (6) pterothorax in ventral view; Mecistogaster kesselringi sp. nov., paratype: (7) pterothorax in ventral view.
FIGURES 19–22 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 19–22. Males of Atlantic Forest species of Mecistogaster. (19–20) Mecistogaster mielkei sp. nov., paratype: (19) penis in ectal view, (20) penis in lateral view [with flagellum broken]; (21–22) Mecistogaster kesselringi sp. nov., paratype: (21) penis in ectal view, (22) penis in lateral view [part of flagellum cut to fit the image].
FIGURES 11–16 in The damselfly genus Mecistogaster (Odonata: Pseudostigmatidae) from the Brazilian Atlantic Forest with a description of three new species and a neotype designation for M. amalia (Burmeister, 1839)
FIGURES 11–16. Atlantic Forest species of Mecistogaster. (11–14) Mecistogaster kesselringi sp. nov., holotype ♁: (11) forew- ing, (12) hindwing; paratype ♀: (13) forewing, (14) hindwing; (15–16) Mecistogaster amalia, first described ♀: (15) forewing, (16) hindwing.
Data from: Dispersal barriers and climate determine the geographic distribution of the helicopter damselfly Mecistogaster modesta
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