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12 results for “army ant associates”
FIGURES 32–46 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 32–46. Sicariomorpha maschwitzi, comb. nov., 32, 33, 42–46, male; 34–41, female. 32–33, spinnerets. 34, leg I, lateral; 35, leg III, lateral; 36, leg IV, lateral. 37–46, tarsal organ, dorsal view. 37, 42, palp; 38, 43, leg I; 39, 44, leg II; 40, 45, leg III; 41, 46, leg IV.
FIGURES 23−31 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 23−31. Sicariomorpha maschwitzi, comb. nov., 23–27, 29–31, male. 23, Dorsal; 24, ventral; 25, lateral; 26, anterior; 27, anterior portion of carapace, ventral; 28, female carapace, anterior; 29, eyes, anterior; 30, chelicera fang, ventral; 31, chelicera fang venom duct opening.
FIGURES 17–22 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 17–22. Sicariomorpha maschwitzi, comb. nov., female. 17, Dorsal; 18, ventral; 19, carapace, dorsal; 20, lateral; 21, abdomen, anterolateral; 22, carapace, anterior.
FIGURES 9–16 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 9–16. Sicariomorpha maschwitzi, comb. nov., 9–14, male palp; 13–16, female genitalia, ventral view. 9, Retrolateral; 10, prolateral; 11, ventral; 12, frontal; 13, dorsal; 14, Palp distal (embolus and conductor), dorsal view; 15, cleared; 16, internal genital sclerite. Scale bars = 0.10 mm.
FIGURES 1–2. 1 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 1–2. 1, Sicariomorpha maschwitzi, comb. nov., participates in ant emigrations by performing a "tandem-running"-like behavior. 2, Participation of S. maschwitzi in host migrations. Leptogenys distinguenda workers heading toward the new nest were counted periodically for 90 sec, followed by a 90 sec break. Additionally, the presence of spiders was counted throughout the entire emigration.
Data from: Evidence for facilitation among avian army-ant attendants: specialization and species associations across elevations
Mixed-species assemblages can involve positive and negative interactions, but uncertainty about high-value patchy resources can increase the value of information sharing among heterospecific co-foragers. I sampled species composition of bird-flocks attending army-ant raids in three adjacent elevation zones in Costa Rica, across multiple years, to test for positive and negative associations among raid-attending bird species. My goal was to test whether the most frequent and specialized raid-attending species showed evidence of facilitating or excluding other bird species. I quantified elevational variation in avian community composition at raids, then asked whether species composition was associated with variation in flock characteristics (flock size and species richness). I identified the most frequent raid-attending species (those that attended raids most frequently relative to their mist-net capture rates), and bird species that performed specialized army ant-following behavior (bivouac-checking, which allows birds to memorize and track mobile army-ant colonies). There was significant turnover of bird species among zones (including the frequent and specialized attendants); patterns of species overlap suggested a gradual transition from a Pacific-slope to an Atlantic-slope raid-attending bird fauna. Raid-attendance frequency was positively correlated with bivouac-checking behavior. With few exceptions, the most frequent raid-attending bird species, and the bivouac-checking species, also participated in the most species-rich flocks. High species-gregariousness suggests many of the frequently attending and/or bivouac-checking species functioned as core flock members. However, some bird species pairs were significantly negatively associated at raids. Despite species turnover, per-flock numbers of birds at raids did not differ among geographic zones, but flocks on the Pacific-slope were heavier because larger bodied bird species attended raids. Previous studies showed that the size (biomass) of bird-flocks corresponds to the amount of food the birds kleptoparasitize from ant raids, and the heavier Pacific-slope bird-flocks could have greater negative kleptoparasitic impacts.
Data from: Evidence for facilitation among avian army-ant attendants: specialization and species associations across elevations
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Data from: Cryptic diversity, high host specificity and reproductive synchronization in army ant-associated Vatesus beetles
Army ants and their arthropod symbionts represent one of the most species-rich animal associations on Earth, and constitute a fascinating example of diverse host-symbiont interaction networks. However, despite decades of research, our knowledge of army ant symbionts remains fragmentary due to taxonomic ambiguity and the inability to study army ants in the lab. Here we present an integrative approach that allows us to reliably determine species boundaries, assess biodiversity, match different developmental stages and sexes, and to study the life cycles of army ant symbionts. This approach is based on a combination of community sampling, DNA barcoding, morphology and physiology. As a test case, we applied this approach to the staphylinid beetle genus Vatesus and its different Eciton army ant host species at La Selva Biological Station, Costa Rica. DNA barcoding led to the discovery of cryptic biodiversity and, in combination with extensive community sampling, revealed strict host partitioning with no overlap in host range. Using DNA barcoding, we were also able to match the larval stages of all focal Vatesus species. In combination with studies of female reproductive physiology, this allowed us to reconstruct almost the complete life cycles of the different beetle species. We show that Vatesus beetles are highly adapted to the symbiosis with army ants, in that their reproduction and larval development are synchronized with the stereotypical reproductive and behavioral cycles of their host colonies. Our approach can now be used to study army ant-symbiont communities more broadly, and to obtain novel insights into co-evolutionary and ecological dynamics in species-rich host-symbiont systems.
Fig. 2 in Taxonomic Review and Natural History Notes of the Army Ant-Associated Beetle Genus Ecclisister Reichensperger (Coleoptera: Histeridae: Haeteriinae)
Fig. 2. Collection sites and phylogenetic tree of barcoded Ecclisister costaericae populations. A) Map of Central and South America depicting the collection sites of studied Ecclisister specimens, B) RAxML tree of COI sequence data (658bp) depicting genetic divergence of E. costaericae from different populations. Bootstrap support (1,000 replications) is given at branches of interest. The scale bar represents expected substitutions per site as inferred by the RAxML algorithm. The haeteriine species Cheilister lucidulus Reichensperger (GenBank accession number: KX420342; von Beeren and Tishechkin, 2017) and Clientister henrici Reichensperger (GenBank accession number: KX420343; von Beeren and Tishechkin, 2017), both members of the tribe Nymphistrini, served as outgroups. Sample names are given at tips (for more information, see Table 1).
Fig. 1. Ecclisister species. E in Taxonomic Review and Natural History Notes of the Army Ant-Associated Beetle Genus Ecclisister Reichensperger (Coleoptera: Histeridae: Haeteriinae)
Fig. 1. Ecclisister species. E. bickhardti lectotype: a) dorsal view, b) lateral view, c) ventral view, d) frontal head, e) aedeagus, dorsal view, f) aedeagus, lateral view; E. costaericae lectotype: g) dorsal view, h) lateral view, i) ventral view, j) frontal head, k) aedeagus, dorsal view, l) aedeagus, lateral view. Scale bars: a–c, g–i = 1 mm; d and j = 0.2 mm. Dorsal and lateral views of aedeagi are at the same scale.
Data from: Cryptic diversity, high host specificity and reproductive synchronization in army ant-associated Vatesus beetles
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FIGURES 3−8 in Sicariomorpha, a New Myrmecophilous Goblin Spider Genus (Araneae, Oonopidae) Associated with Asian Army Ants
FIGURES 3−8. Sicariomorpha maschwitzi, comb. nov., male. 3, Dorsal; 4, ventral; 5, frontal; 6, lateral; 7, sternum, ventral; 8, abdomen, ventral.
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Allen Brain Atlas
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