Putative fixed effect and justification, mechanism, or example | Predicted association with GCs |
---|---|
A. Food limitation | |
   1. General |  |
      (a) GCs increase in response to natural food limitation |  |
         (i) GCs increase in the dry season and are negatively correlated with rainfall in African elephant (Loxodonta africana) [12] |  |
         (ii) GCs were higher in a food-limited group versus a food-abundant group in black-legged kittiwakes (Rissa tridactyla) [25] |  |
      (b) GCs increases in response to experimental food limitation |  |
         (i) GCs increase under food limitation in black-legged kittiwakes (Rissa tridactyla) [27] |  |
         (ii) Food limitation during development increases GCs in western scrub-jays (Aphelocoma californica) [28] |  |
         (iii) Food limitation and unpredictability increase GCs in mountain chickadees (Poecile gambeli) [29] |  |
         (iv) Food limitation increases GCs in barn swallows (Hirundo rustica) [30] |  |
   2. Access to anthropogenic food resources | Negative |
     (a) GCs decrease during anthropogenic food provisioning in Sykes’ monkeys (Cercopithecus mitis albogularis) [18] |  |
      (b) Refuse-feeding banded mongooses exhibit better physical condition than non-refuse-feeders [54] |  |
      (c) Banded mongoose area use is concentrated around refuse sites [39, 55] |  |
         (i) GCs increase with increased foraging travel time in Mexican howlers (Alouatta palliata mexicana) [23] |  |
         (ii) GCs increase under high food search demand effort in squirrel monkeys (Saimiri sciureus) [22] |  |
      (d) Banded mongoose escorts lose body mass while provisioning pups and exhibit increased fGCMs, but fGCMs are reduced in these animals if fed supplementally [43] |  |
   3. Fecal organic matter | Negative |
      (a) Indicator of organic matter intake in cattle (Bos taurus) and goats (Capra aegagrus) [56] |  |
      (b) Complementary measures, fecal ash and ingested soil, also indicate food limitation |  |
         (i) Domestic sheep (Ovis aries) increase soil ingestion as forage [57] and food supplementation [58, 59] decrease and stocking rates increase [60] |  |
         (ii) Aardwolves (Proteles cristata) have more fecal sand when termites are scarce [61] |  |
         (iii) Tamanduas (Tamandua tetradactyla) ingest more substrate during behavioral or dietary deficits [62] |  |
         (iv) Three-banded armadillos (Tolypeutes tricinctus) ingested more soil in dry seasons [63] |  |
         (v) Giant anteater (Myrmecophaga tridactyla) fecal nutrition markers were inversely related to fecal ash [64] |  |
   4. Recent rainfall | Negative |
      (a) Millipedes and (at times) termite alates dominate banded mongoose diet [65] |  |
      (b) Rainfall affects banded mongoose prey availability: soil macroinvertebrates [66]; millipedes [67]; termite alates [68] |  |
         (i) Residual effect of rain on millipede availability may last up to 8 days [67] |  |
   5. Soil macrofauna density | Negative |
      (a) Soil macrofauna densities at our study site vary by habitat type [66] |  |
B. Reproduction | |
   1. Breeding status | Positive |
         (a) GCs increase in female meerkats (Suricata suricatta) as pregnancy progresses [8] |  |
         (b) GCs increase in mate-guarding male long-tailed macaques (Macaca fascicularis) [69] |  |
         (c) Mating, parturition, associated agonistic encounters, and pup depredations increase GCs in captive banded mongooses [38] |  |
         (d) Alloparental care (pup provisioning) in banded mongoose is associated with increased fGCMs (although this may be driven by energetic losses) [43] |  |
         (e) Subordinate female banded mongoose have higher fGCM concentrations in late pregnancy than higher ranked females (although this may be driven by exclusion from food resources and resulting energetic losses) [50] |  |
C. Predation risk | |
   1. Group size | Negative |
      (a) GCs increase under higher predation risk in European rabbits (Oryctolagus cuniculus) [10] |  |
         (i) Larger groups should lower per capita predation risk—dilution effect [70,71,72,73] |  |
         (ii) Larger groups should lower per capita vigilance—detection effect [74, 75] |  |
         (iii) Larger group sizes do exhibit lower per capita vigilance in banded mongooses [76] |  |
         (iv) GCs are positively associated with vigilance in meerkats [11] |  |
   2. Canopy cover | Negative |
      (a) Aerial predators are putatively important, if not predominant natural predators of banded mongooses e.g. martial eagles (Polemaetus bellicosus) [77] |  |
         (i) Hunting success for large raptors is diminished in areas of higher canopy cover e.g. Bonelli’s eagle (Aquila fasciata) [78, 79] |  |