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269 results for “harvester ants”
Data from: Nest architecture shapes the collective behavior of harvester ants
Structures influence how individuals interact and, therefore, shape the collective behaviours that emerge from these interactions. Here I show that the structure of a nest influences the collective behaviour of harvester ant colonies. Using network analysis, I quantify nest architecture and find that as chamber connectivity and redundancy of connections among chambers increase, so does a colony's speed of recruitment to food. Interestingly, the volume of the chambers did not influence speed of recruitment, suggesting that the spatial organization of a nest has a greater impact on collective behaviour than the number of workers it can hold. Thus, by changing spatial constraints on social interactions organisms can modify their behaviour and impact their fitness.
Data from: Harvester ant seed removal in an invaded sagebrush ecosystem: implications for restoration
<p>A better understanding of seed movement in plant community dynamics is needed, especially in light of disturbance-driven changes and investments into restoring degraded plant communities. A primary agent of change within the sagebrush-steppe is wildfire and invasion by non-native forbs and grasses, primarily cheatgrass (<i>Bromus tectorum</i>). Our objectives were to quantify seed removal and evaluate ecological factors influencing seed removal within degraded sagebrush-steppe by granivorous Owyhee harvester ants (<i>Pogonomyrmex salinus</i> Olsen). In 2014, we sampled 76 harvester ant nests across 11 plots spanning a gradient of cheatgrass invasion (40-91% cover) in southwestern Idaho, USA. We presented seeds from four plant species commonly used in post-fire restoration at 1.5 and 3.0 m from each nest to quantify seed removal. We evaluated seed selection for presented species, monthly removal, and whether biotic and abiotic factors (e.g., distance to nearest nest, temperature) influenced seed removal. Our top model indicated seed removal was positively correlated with nest height, an indicator of colony size. Distance to seeds and cheatgrass canopy cover reduced seed removal, likely due to increased search and handling time. Harvester ants were selective, removing Indian ricegrass (<i>Achnatherum hymenoides</i>) more than any other species presented. We suspect this was due to ease of seed handling and low weight variability. Nest density influenced monthly seed removal, as we estimated monthly removal of 1,890 seeds for 0.25 ha plots with 1 nest and 29,850 seeds for plots with 15 nests. Applying monthly seed removal to historical restoration treatments across the western U.S. showed harvester ants can greatly reduce seed availability at degraded sagebrush sites; for instance, fourwing saltbush (<i>Atriplex canescens</i>) seeds could be removed in <2 months. Collectively, these results shed light on seed removal by harvester ants and emphasize their potential influence on post-fire restoration within invaded sagebrush communities.</p>
FIGURE 113 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 113. Photographs of Pogonomyrmex wilsoni holotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0923341). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 114 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 114. Photographs of Pogonomyrmex abdominalis male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922554). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 112 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 112. Geographic distribution of: (A) Pogonomyrmex weiseri, and (B) P. wilsoni. The large black circle in each panel denotes the type locality.
FIGURE 110 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 110. Photographs of Pogonomyrmex weiseri alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922459). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 109 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 109. Photographs of Pogonomyrmex weiseri worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0172679). Photographs by April Nobile from www.AntWeb.org.
FIGURE 108 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 108. Photographs of Pogonomyrmex vermiculatus male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0280981). Photographs by Estella Ortega from www.AntWeb.org.
FIGURE 107 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 107. Photographs of Pogonomyrmex vermiculatus alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0280982). Photographs by Estella Ortega from www.AntWeb.org.
FIGURE 106 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 106. Photographs of Pogonomyrmex vermiculatus worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0280983). Photographs by Estella Ortega from www.AntWeb.org.
FIGURE 105 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 105. Photographs of Pogonomyrmex varicolor paratype male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922469). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 104 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 104. Photographs of Pogonomyrmex varicolor paratype alate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922467). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 103 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 103. Photographs of Pogonomyrmex varicolor paratype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922471). Workers of P. varicolor are highly variable: photographs show the less common bicolored pattern (head and gaster dark reddish, mesosoma black) with superior propodeal spines consisting of short, triangular teeth. Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 102 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 102. Photographs of Pogonomyrmex varicolor paratype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922470). Workers of P. varicolor are highly variable: photographs show the less common concolorous black color pattern with short superior propodeal spines. Photographs by Michele Esposito from www. AntWeb.org.
FIGURE 100 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 100. Geographic distribution of: (A) Pogonomyrmex tafi, (B) P. varicolor, and (C) P. vermiculatus. The large black circle in each panel denotes the type locality.
FIGURE 101 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 101. Photographs of Pogonomyrmex varicolor holotype worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922468). Workers of P. varicolor are highly variable: photographs show the typical bicolored worker (head and mesosoma black, gaster dark orangish-black) with superior propodeal spines consisting of short, triangular teeth. Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 99 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 99. Photographs of Pogonomyrmex tafi paratype male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0235303). Photographs by Shannon Hartman and Will Ericson from www.AntWeb.org.
FIGURE 96 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 96. Photographs of Pogonomyrmex strioligaster male: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922164). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 98 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 98. Photographs of Pogonomyrmex tafi paratype dealate queen: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922473). Photographs by Michele Esposito from www.AntWeb.org.
FIGURE 81 in A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part II
FIGURE 81. Photographs of Pogonomyrmex sanmartini worker: (A) frontal view of head, (B) lateral view of body, and (C) dorsal view of body (CASENT0922478). Workers of P. sanmartini are highly variable: photographs show concolorous black worker with long superior propodeal spines and strongly irregular rugae to weakly rugoreticulate on dorsum of promesonotum. Photographs by Michele Esposito from www.AntWeb.org.
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International Brain Laboratory public data
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OpenNeuro
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