Listar Biología por autor "Stynoski, Jennifer Lynn"
Mostrando ítems 1-19 de 19
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Cannibalism by large tadpoles of Rhinophrynus dorsalis (Anura: Rhinophrynidae)
Stynoski, Jennifer Lynn; Sasa Marín, Mahmood (2018)In June 2014, we captured approximately 100 R. dorsalis tadpoles in a net from a seasonal wetland in Palo Verde National Park (10.3428 N, 85.3375 W) in N, 85.3375 W) in northwestern Costa Rica. While rearing the tadpoles ... -
Developmental morphology of granular skin glands in pre-metamorphic egg-eating poison frogs
Stynoski, Jennifer Lynn; O'Connell, Lauren A. (2017)Parents in many taxa, including insects, mol- luscs, fish, snakes, and amphibians provision chemical defences, such as peptides, steroids, or alkaloids to their offspring to reduce the risk of predation. In most cases, ... -
Differences in escape behavior between a cryptic and an aposematic litter frog
Ozel, L. Deniz; Stynoski, Jennifer Lynn (2011)Clay models have been used to investigate the relative antipredator effectiveness of cryptic and of aposematic coloration in litter frogs, but such studies do not account for possible differences in prey escape behavior. ... -
Discrimination of offspring by indirect recognition in an egg-feeding dendrobatid frog, Oophaga pumilio
Stynoski, Jennifer Lynn (2009)Offspring discrimination, the differential treatment of offspring and unrelated young, functions in numerous animal taxa to ensure that vital and costly parental care behaviours are appropriately directed. Discrimination ... -
Empirical evidence for multiple costs of begging in poison frog tadpoles
Stynoski, Jennifer Lynn; Stynoski, Peter B.; Noble, Virginia R. (2018)In recent decades, theoretical and empirical work has investigated the relative roles of costs and benefits in inhibiting excessive displays of begging to parents. Whether costs are important in maintaining reliability of ... -
Evidence of maternal provisioning of alkaloid-based chemical defenses in the strawberry poison frog Oophaga pumilio
Stynoski, Jennifer Lynn; Torres Mendoza, Yaritbel; Sasa Marín, Mahmood; Saporito, Ralph A. (2014)Many organisms use chemical defenses to reduce predation risk. Aposematic dendrobatid frogs sequester alkaloid-based chemical defenses from a diet of arthropods, but research on these defenses has been limited to adults. ... -
Ground Anoles (Anolis humilis) Discriminate between Aposematic and Cryptic Model Insects
Baruch, Ethan M.; Manger, Morgan A.; Stynoski, Jennifer Lynn (2016)Aposematic coloration allows predators to use visual cues to avoid eating potentially toxic or distasteful prey. Predators across many animal taxa actively avoid aposematically colored prey and remember distasteful brightly ... -
Larval aggression is independent of food limitation in nurseries of a poison frog
Dugas, Matthew B.; Stynoski, Jennifer Lynn; Strickler, Stephanie (2016)Aggression between nurserymates is common in animals and often hypothesized to result from proximate resource limita- tion. In numerous terrestrial frogs, larvae develop in phytotelmata, tiny water bodies where resources ... -
Maternally derived chemical defenses are an effective deterrent against some predators of poison frog tadpoles (Oophaga pumilio)
Stynoski, Jennifer Lynn; Shelton, Georgia; Stynoski, Peter B. (2014)Parents defend their young in many ways, including provisioning chemical defences. Recent work in a poison frog system offers the first example of an animal that provisions its young with alkaloids after hatching or birth ... -
Patterns of second‐to‐fourth digit length ratios (2D:4D) in two species of frogs and two species of lizards at La Selva, Costa Rica
DiRenzo, Graziella Vittoria; Stynoski, Jennifer Lynn (2012)It is now well documented that androgen and estrogen signaling dur- ing early development cause a sexual dimorphism in second-to-fourth digit length ratio (2D:4D). It is also well documented that males of mam- malian ... -
Poison frogs, quick guide
Stynoski, Jennifer Lynn; Schulte, Lisa María; Rojas Zuluaga, Bibiana (2015)What are poison frogs? Poison frogs, also commonly called ‘dart poison frogs’ or ‘poison arrow frogs’, are charismatic amphibians forming a spectacular adaptive radiation, comparable to that of African cichlids. Many of ... -
Prolonged development of the middle ear in Rhinella horribilis
Womack, Molly C.; Stynoski, Jennifer Lynn; Voyles, Meredith K.; Coloma Román, Luis A.; Hoke, Kim L. (2018)Despite the benefit of the tympanic middle ear to airborne hearing sensitivity, anurans range in how soon they develop functional middle ears after transitioning to life on land. Previous evi- dence suggested that bufonids ... -
Rhaebo haematiticus (litter toad) and Craugastor fitzingeri (Fitzinger's rain frog) reproductive behavior
Stynoski, Jennifer Lynn; Castro, Enrique; Vargas Ramírez, Orlando (2013-03)C. fitzingeri was observed in amplexus with a large female R. haematiticus at Sarapiquí, Costa Rica -
Rhinella yunga. Predation
Tortorelli, Claire M.; Gannon, Dustin G.; Stynoski, Jennifer Lynn; Trama, Florencia A. (2016)Rhinella yunga, a recently described toad species of the Rhinella margaritifera group (Moravec et al. 2014. Zookeys 37:35–56), is known from the tropical mountains of the Cordillera Yanachaga, Junin Province, Peru. Rhinella ... -
Sexual dimorphism in the second-to-fourth digit length ratio in green anoles, Anolis carolinensis (Squamata: Polychrotidae), from the southeastern United States
Stynoski, Jennifer Lynn; Doughty, Stephanie; Wade, Juli S.; Lovern, Matthew B. (2006)Digit length ratios are organized during embryonic development and may show sexual dimorphism related to steroid exposure. The second-to-fourth digit length ratio (2D:4D) has received the most attention. In the present ... -
Sexual dimorphism of the second-to-fourth digit length ratio (2D : 4D) in the Strawberry Poison Dart Frog (Oophaga pumilio) in Costa Rica
Stynoski, Jennifer Lynn (2008)The second-to-fourth digit ratio (2D : 4D) is a well-studied sexual dimorphism that likely arises as a result of prenatal androgenic effects on homeobox gene expression. This dimorphism has been found to exhibit interesting ... -
Tadpole begging reveals high quality
Dugas, Matthew B.; Strickler, Stephanie; Stynoski, Jennifer Lynn (2017)Parents can benefit from allocating limited resources non randomly among offspring, and offspring solicitation (i.e. begging) is often hypothesized to evolve because it contains information valuable to choosy parents. We ... -
The management of Typha domingensis (Typhaceae) affects macroinvertebrate assemblages in the Palo Verde Wetland, Guanacaste, Costa Rica
Trama, Florencia A.; Rizo Patron Viale, Federico L. S.; Kumar, Anjali S.; Stynoski, Jennifer Lynn; McCoy Colton, Michael B.; Springer Springer, Monika (2017)The Palo Verde wetland, one of the most important places for aquatic organisms in Costa Rica, is currently recovering from an invasive expansion of Typha domingensis (cattail). A monitoring program was designed to understand ... -
To beg or to freeze: multimodal sensory integration directs behavior in a tadpole
Stynoski, Jennifer Lynn; Noble, Virginia R. (2012)Effective coordination of behaviors such as foraging and avoiding predators requires an assessment of cues provided by other organisms. Integrating cues from multiple sensory modalities may enhance the assessment. We studied ...