Johngarthia cocoensis, a new species of Gecarcinidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) from Cocos Island, Costa Rica

Perger, Robert; Vargas, Rita; Wall, Adam

doi:10.11646/zootaxa.2911.1.4

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…Measurements of carapace width were taken with a digital calliper. For species determination we compared collected specimens with original descriptions and material from other Pacific islands cited in Perger et al (2011). Specimens of Johngarthia planata from Gorgona Island were not available for study; however, we compared with photographs provided by Matthew Gable (Colombia) and Von Prahl (1983).…”

Section: Collections and Observationsmentioning

confidence: 99%

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Closing a distributional gap of over 3000 km and encountering an invisible barrier: new presence/absence data for Johngarthia planata Stimpson, 1860 (Decapoda, Brachyura, Gecarcinidae) for Central America and biogeographic notes on East Pacific Gecarcinidae

Perger

Cortés

Pacheco

2013

Crustac

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Johngarthia planata (Stimpson, 1860) is an abundant and ecologically important land crab, distributed on East Pacific islands from the Gulf of California to Colombia. However, despite possible dispersal of planktotropMc larvae by sea currents, J. planata is not known from inshore islands and mainland of Central America. In this study, the presence of J. planata on Costa Rican inshore islands is reported for the first time, strongly supporting the significance of coastal currents for the distributional patterns of such species. Despite the proximity of the Costa Rican inshore islands to the mainland coast and larval dispersal by passing coastal currents, /. planata was not found in mainland locations. We suggest that a high diversity of continental land crab predators excludes /. planata from the continental mainland habitat, while the closely related Gecarcinus quadratus may have adaptations to high prédation pressure. RESUMENJohngarthia planata (Stimpson, 1860) es un cangrejo terrestre abundante y ecológicamente importante, que se encuentra en islas del Pacífico Oriental desde el Golfo de California a Colombia. Sin embargo, a pesar de la capacidad de dispersión de las larvas planctotróficas de J. planata no se conoce de islas cercanas a la costa o de la costa de América Central. En este estudio, se informa, por primera vez, de la presencia de J. planata en Costa Rica en islas cercanas a la costa, apoyando la importancia de corrientes costeras en los patrones de distribución de la especie. Aún así, J. planata no se encontró en el continente, a pesar de la cercanía de las islas costeras y su posibilidad de dispersión por corrientes. Sugerimos que la alta diversidad de cangrejos terrestres depredadores en el continente excluyen J. planata de habitats allí, mientras que Gecarcinus quadratus, una especie relacionada, puede estar adaptada a altas presiones de depredación. ' ) Present address: Bolivian Collection of Fauna,

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Section: Collections and Observationsmentioning

confidence: 99%

“…Specimens of Johngarthia planata from Gorgona Island were not available for study; however, we compared with photographs provided by Matthew Gable (Colombia) and Von Prahl (1983). For the taxonomic status of 7. planata, please see Perger et al (2011).…”

Section: Collections and Observationsmentioning

confidence: 99%

Closing a distributional gap of over 3000 km and encountering an invisible barrier: new presence/absence data for Johngarthia planata Stimpson, 1860 (Decapoda, Brachyura, Gecarcinidae) for Central America and biogeographic notes on East Pacific Gecarcinidae

Perger

Cortés

Pacheco

2013

Crustac

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“…Bright 1966, Sherman 2002, Lindquist et al 2009). On the other hand, the remaining four species of Johngarthia (see López-Victoria and Werding 2008, Hartnoll 2010, Perger et al 2011) and Gecarcinus ruricola (Bright and Hogue 1972) have been reported from islands only, supporting the pattern suggested by Paulay and Starmer (2011). Several studies strongly indicate that Johngarthia planata has not established populations along the Central American mainland coast (see Perger et al 2013 for a short review; Fig.…”

Section: Discussionmentioning

confidence: 79%

The land crab Johngarthia planata (Stimpson, 1860) (Crustacea, Brachyura, Gecarcinidae) colonizes human-dominated ecosystems in the continental mainland coast of Mexico

Perger¹

2014

BDJ

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The land crab Johngarthia planata (Stimpson, 1860) has been reported from the Baja California Peninsula and several oceanic islands in the Eastern Pacific as well as inshore islands of the Mexican, Costa Rican and Colombian coast. However, the species has not been observed on the continental mainland, as it is likely that the high diversity of terrestrial predators/competitors make the establishment of mainland populations nearly impossible. In this contribution, several new records of this species that have been observed in urban areas along the continental Pacific coast of Mexico are reported. These records demonstrate that the presence of humans does not necessarily have a negative impact on land crab species. Indeed, the presence of humans may actually discourage the presence of native crab predators/competitors and hence increase the likelihood of a successful mainland settlement of land crab species that are otherwise island and peninsula restricted. The presence of Johngarthia planata is ecologically relevant for coastal forests because gecarcinid crabs significantly influence plant recruitment and Johngarthia planata is considerably larger than the mainland species Gecarcinus quadratus.

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“…Besides D. celeste there are a number of gecarcinids that exhibit island endemism, i.e. Johngarthia malpilensis (Faxon, 1893) which is only found on Malpelo, an island off the Pacific coast of Colombia (Lopez-Victoria & Werding, 2008), Johngarthia cocoensis Perger, Vargas & Wall, 2011 found on Cocos Island off the Pacific coast of Costa Rica (Perger et al , 2011), and G. natalis which is also endemic to Christmas Island (Hicks, 1985; Hartnoll, 1988; Hicks et al , 1990). Species which are endemic to remote oceanic islands are particularly vulnerable to population decline, primarily due to habitat deterioration, often as a direct result of human habitation (Triantis et al , 2010).…”

Section: Discussionmentioning

confidence: 99%

Phylogeography of the Christmas Island blue crab,Discoplax celeste(Decapoda: Gecarcinidae) on Christmas Island, Indian Ocean

Turner¹,

Jesper

Smith³

et al. 2012

J. Mar. Biol. Ass.

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The land crab,Discoplax celeste(Gecarcinidae) is endemic to Christmas Island in the Indian Ocean. Due to a freshwater-dependant life history, in which the megalopae migrate from the ocean up freshwater streams to their adult terrestrial/freshwater habitat,D. celesteinhabits only a few isolated locations on the island. This restricted distribution is one of a number of factors which has previously highlighted the vulnerability of this species to outside threats. A number of anthropogenic factors including the introduction of multiple invasive species and habitat destruction have led to drastic ecosystem change on Christmas Island. The aim of this study was to investigate whether the restricted geographical distributions ofD. celestepopulations contribute to significant genetic structuring across Christmas Island, with an objective to inform future conservation strategies for this species on Christmas Island. Fragments of the mitochondrial cytochrome oxidase I gene and the control region were sequenced from 95 individuals collected from all five locations on Christmas Island known to be inhabited byD. celeste. Analyses using analysis of molecular variance revealed no evidence of population sub-structuring, indicating that despite any geographical isolation, there is a single population ofD. celesteon Christmas Island. This lack of population differentiation is probably explained by the oceanic dispersal of larvae, rather than terrestrial migration ofD. celeste. Therefore, based on these results, for conservation purposes,D. celesteon Christmas Island can be considered a single management unit.

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Johngarthia cocoensis, a new species of Gecarcinidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) from Cocos Island, Costa Rica

Cited by 15 publications

References 11 publications

Closing a distributional gap of over 3000 km and encountering an invisible barrier: new presence/absence data for Johngarthia planata Stimpson, 1860 (Decapoda, Brachyura, Gecarcinidae) for Central America and biogeographic notes on East Pacific Gecarcinidae

Closing a distributional gap of over 3000 km and encountering an invisible barrier: new presence/absence data for Johngarthia planata Stimpson, 1860 (Decapoda, Brachyura, Gecarcinidae) for Central America and biogeographic notes on East Pacific Gecarcinidae

The land crab Johngarthia planata (Stimpson, 1860) (Crustacea, Brachyura, Gecarcinidae) colonizes human-dominated ecosystems in the continental mainland coast of Mexico

Phylogeography of the Christmas Island blue crab,Discoplax celeste(Decapoda: Gecarcinidae) on Christmas Island, Indian Ocean

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