JPG, 318 KB
Prey Animals, Gaur, Sambar, Cubs, Tiger, Poaching, Herbivore Prey
- Journal Article2014Long-lived benthic predators require structurally stable reefs in the face of repeated climate-change disturbancesCoral Reefs. 33: 289-302
Benthic recovery from climate-related disturbances does not always warrant a commensurate functional recovery for reef-associated fish communities. Here, we examine the distribution of benthic groupers (family Serranidae) in coral reef communities from the Lakshadweep archipelago (Arabian Sea) in response to structural complexity and long-term habitat stability. These coral reefs that have been subject to two major El Nin ̃o Southern Oscillation-related coral bleaching events in the last decades (1998 and 2010). First, we employ a long-term (12-yr) benthic- monitoring dataset to track habitat structural stability at twelve reef sites in the archipelago. Structural stability of reefs was strongly driven by exposure to monsoon storms and depth, which made deeper and more sheltered reefs on the eastern aspect more stable than the more exposed (western) and shallower reefs. We surveyed groupers (species richness, abundance, biomass) in 60 sites across the entire archipelago, representing both exposures and depths. Sites were selected along a gradient of structural complexity from very low to high. Grouper biomass appeared to vary with habitat stability with significant differences between depth and exposure; sheltered deep reefs had a higher grouper biomass than either sheltered shallow or exposed (deep and shallow) reefs. Species richness and abundance showed similar (though not significant) trends. More interestingly, average grouper biomass increased exponentially with structural complexity, but only at the sheltered deep (high stability) sites, despite the availability of recovered structure at exposed deep and shallow sites (lower-stability sites). This trend was especially pronounced for long-lived groupers (life span [10 yrs). These results suggest that long-lived groupers may prefer temporally stable reefs, independent of the local availability of habitat structure. In reefs subject to repeated disturbances, the presence of structurally stable reefs may be critical as refuges for functionally important, long-lived species like groupers.
- Poster2014Spotting Elephant SignsDownload
JPG, 353 KB
Dung, Herd, Inefficient Digestion, Debark, Tuskers, Deciduous Forests, Grewia, Teak
JPG, 455 KB
Landscape Species, Forests, Grasslands, Plantations, Cow Elephants, 'Matriarch'
- Poster2014Venomous SnakesDownload
PDF, 20.2 MB
Malabar Pit Viper, Striped Coral Snake, Large-scaled Pit Viper, Hump-nosed Pit Viper, Spectacled Cobra, Common Krait, Rats, Heat-sensitive Pit, Tamil
- Popular Article2014Gardeners of the rainforestSaevus, November 2014, pp. 19-23.
- Poster2014Tortoise and TurtlesDownload
PDF, 7.04 MB
Indian Pond Terrapin, Cochin Forest Cane Turtle, Travancore Tortoise, Tamil
PDF, 32.2 MB
Two-headed Snake, Earthworms, Insect Larvae, Flattened Tail, Tamil
- Report2014Hornbill Nest Adoption Program - 2014 breeding season2014 HNAP Report
- Poster2014Non-Venomous SnakeDownload
PDF, 24.8 MB
Ornate Flying Snake, Indian Rock Python, Indian Rat Snake, Green Kneelback, Travancore Wolf Snake, Brown Vine Snake, Montane Trinket Snake, Tamil
- Popular Article2014இலையில்லை, நாம் இல்லை. (On Leaves and why are young leaves are red)தி இந்து நாளிதழ். The Hindu Tamil News Daily. 21st October 2014.
Jeganathan, P. (2014). இலையில்லை, நாம் இல்லை - தி இந்து நாளிதழ் உயிர்மூச்சு இணைப்பில், ‘இயற்கையின் வாசலில்’ தொடர் எண் – 16. 21st October 2014. Ilaiyillai Namillai – Iyarkayin Vaasalil ArticleSeries No.16 (On Leaves and why are young leaves are red). The Hindu Tamil News Daily. 21st October 2014.
PDF, 22.1 MB
Forest Calotes, Chameleon, South Green Calotes, Indian Rock Agama, Salea, Draco, Tamil
- Poster2014Greater Racket-tailed DrongoDownload
PDF, 1010 KB
Drongo, Moist Deciduous, Rainforests, Mimics, Canopy, Lion-tailed Macaques, Tamil
- Popular Article2014Call of the birdsThe Hindu in School, 31 Dec
- Poster2014Fig TreesDownload
PDF, 4.51 MB
Banyan, Peepul, Fig Wasps, Bulbuls, Squirrels, Hornbills, Macaques, Tamil
- Popular Article2013Three different voicesThe Hindu in School, 17 July
- Book2013Paravaikal: arimugak kaiyedu.(A photographic field guide on birds in Tamil). Pp. 184.Cre-A, Chennai.
Jeganathan, P & Asai (2013). Paravaikal: arimugak kaiyedu.(a photographic field guide on birds in Tamil). Cre-A, Chennai. Pp. 184. (Link here)
- Dataset2013Data from: Influence of gaze and directness of approach on the escape responses of the Indian rock lizard, Psammophilus dorsalis (Gray, 1831).Dryad Digital Repository. doi:10.5061/dryad.1h551
Contains both raw data and analysis scripts. Permanent link to the dataset and scripts on Dryad:
- Book Chapter2013The Monkey in the Town’s Commons, Revisited: An Anthropogenic History of the Indian Bonnet MacaquePages 187-208 in S. Radhakrishna et al. (eds.), The Macaque Connection: Cooperation and Conflict between Humans and Macaques, Developments in Primatology: Progress and Prospects, Springer, New Delhi
- Journal Article2013Influence of gaze and directness of approach on the escape responses of the Indian Rock Lizard, Psammophilus dorsalis (Gray, 1831).Journal of Biosciences. 38(5): 829–833.Download
PDF, 145 KB
Free download from J. Biosciences webpage:
Animals often evaluate the degree of risk posed by a predator and respond accordingly. Since many predators orient their eyes towards prey while attacking, predator gaze and directness of approach could serve as conspicuous indicators of risk to prey. The ability to perceive these cues and discriminate between high and low predation risk should benefit prey species through both higher survival and decreased energy expenditure. We experimentally examined whether Indian rock lizards (Psammophilus dorsalis) can perceive these two indicators of predation risk by measuring the variation in their fleeing behaviour in response to type of gaze and approach by a human predator. Overall, we found that the gaze and approach of the predator influenced flight initiation distance, which also varied with attributes of the prey (i.e. size/sex and tail-raise behaviour). Flight initiation distance (FID) was 43% longer during direct approaches with direct gaze compared with tangential approaches with averted gaze. In further, exploratory, analyses, we found that FID was 23% shorter for adult male lizards than for female or young male (FYM) lizards. In addition, FYM lizards that showed a tail-raise display during approach had a 71% longer FID than those that did not. Our results suggest that multiple factors influence the decision to flee in animals. Further studies are needed to test the generality of these factors and to investigate the proximate mechanisms underlying flight decisions.