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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
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 ...
Rhinella yunga. Predation
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 ...
Empirical evidence for multiple costs of begging in poison frog tadpoles
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 ...
Tadpole begging reveals high quality
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 ...
Developmental morphology of granular skin glands in pre-metamorphic egg-eating poison frogs
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, ...
Sexual dimorphism of the second-to-fourth digit length ratio (2D : 4D) in the Strawberry Poison Dart Frog (Oophaga pumilio) in Costa Rica
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 ...
Rhaebo haematiticus (litter toad) and Craugastor fitzingeri (Fitzinger's rain frog) reproductive behavior
C. fitzingeri was observed in amplexus with a large female R. haematiticus at Sarapiquí, Costa Rica
Maternally derived chemical defenses are an effective deterrent against some predators of poison frog tadpoles (Oophaga pumilio)
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 ...
Poison frogs, quick guide
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 ...
The management of Typha domingensis (Typhaceae) affects macroinvertebrate assemblages in the Palo Verde Wetland, Guanacaste, Costa Rica
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 ...