Case studies on decapod crustaceans from the Philippines reveal deep, steep underwater slopes as prime habitats for ‘rare’ species

Mendoza, Jose Christopher E.; Naruse, Tohru; Tan, Shin Hwei; Chan, Tin‐Yam; Forges, Bertrand Richer de; Ng, Peter K. L.

doi:10.1007/978-94-007-0168-7_20

Cited by 5 publications

(7 citation statements)

References 28 publications

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“…The practices of taxonomy and systematics in the IAA have changed substantially in the years since Wallace. Improved infrastructure has made exploration of natural areas easier, which has aided the discovery of new habitats, and new collecting methods further aid biodiversity exploration (e.g., Mendoza et al 2010). Molecular data gathered in the late twentieth century offer a number of refinements over morphology-based methods in biogeography because (a) DNA sequence data generally offers a larger number of characters that help determine relationships among taxa, (b) confidence in the strength of relationships can be assessed, (c) relationships among morphologically static taxa can be ascertained, (d ) divergence times can be estimated, and (e) relative probabilities of different evolutionary hypotheses can be gauged (Avise 2000, Knowles 2009).…”

Section: Systematic and Phylogeographic Patterns In The Indo-australimentioning

confidence: 99%

“…The IAA, encompassing the Coral Triangle, is the planet's biologically richest marine region (Crandall et al 2008, DeBoer et al 2008, Mendoza et al 2010. Studies on marine organisms frequently identify deep and fine-scale population genetic structuring that do not reflect the contiguous marine environment (Crandall et al 2008, DeBoer et al 2008.…”

Section: Land Bridges That Were Exposed During Periods Of Low Sea Levmentioning

confidence: 99%

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Biogeography of the Indo-Australian Archipelago

Lohman

Bruyn

Page

et al. 2011

Annu. Rev. Ecol. Evol. Syst.

449

502

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The extraordinary species richness and endemism of the Indo-AustralianArchipelago (IAA) exists in one of the most geologically dynamic regions ofthe planet. The provenance of its biota has been debated, particularly in thearea known asWallacea. Application of molecular genetic approaches and abetter understanding of the region’s complex geology have stimulated muchrecent biogeographic work in the IAA. We review molecular phylogeneticand phylogeographic studies in light of current geological evidence. Presentdistribution patterns of species have been shaped largely by pre-Pleistocenedispersal and vicariance events, whereas more recent changes in the connectivityof islands within the Archipelago have influenced the partitioning ofintraspecific variation. Many genetic studies have uncovered cryptic specieswith restricted distributions. We discuss the conservation significance ofthe region and highlight the need for cross-taxon comparative studies usingnewly developed analytical approaches well suited to the challenges ofhistorical inference in this region

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Section: Systematic and Phylogeographic Patterns In The Indo-australimentioning

confidence: 99%

Section: Land Bridges That Were Exposed During Periods Of Low Sea Levmentioning

confidence: 99%

Biogeography of the Indo-Australian Archipelago

Lohman

Bruyn

Page

et al. 2011

Annu. Rev. Ecol. Evol. Syst.

449

502

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“…; Vermeij & Dietl ; Mendoza et al . ). The only ecosystem in which chronically rare species are documented to greatly outnumber common ones is the Amazonian tropical rain forest, where 96% of tree species (sampled as individuals more than 10 cm diameter at breast height) are rare (ter Steege et al .…”

Section: Introductionmentioning

confidence: 97%

Rarity and persistence

Vermeij

Grosberg

2017

Ecology Letters

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Rarity is a population characteristic that is usually associated with a high risk of extinction. We argue here, however, that chronically rare species (those with low population densities over many generations across their entire ranges) may have individual-level traits that make populations more resistant to extinction. The major obstacle to persistence at low density is successful fertilisation (union between egg and sperm), and chronically rare species are more likely to survive when (1) fertilisation occurs inside or close to an adult, (2) mate choice involves long-distance signals, (3) adults or their surrogate gamete dispersers are highly mobile, or (4) the two sexes are combined in a single individual. In contrast, external fertilisation and wind-or water-driven passive dispersal of gametes, or sluggish or sedentary adult life habits in the absence of gamete vectors, appear to be incompatible with sustained rarity. We suggest that the documented increase in frequency of these traits among marine genera over geological time could explain observed secular decreases in rates of background extinction. Unanswered questions remain about how common chronic rarity actually is, which traits are consistently associated with chronic rarity, and how chronically rare species are distributed among taxa, and among the world's ecosystems and regions.

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“…Another potential explanation for the difference in invertebrate densities is that the habitats surveyed at Las Gemelas covered a smaller range of slope categories (most slopes were 30º to 60º) than present at Isla del Coco, which was comprised primarily of more extreme slopes (typically <30º or >60º). Mendoza et al (2010) showed that deep, steep underwater slopes as prime habitats for many decapod crustaceans and suggested that these habitats are understudied, thus may contain many new species. Until more surveys are conducted to enable an analysis of species-area curves, we cannot fully explain the observed differences.…”

Section: Discussionmentioning

confidence: 99%

Characterization of deepwater invertebrates at Isla del Coco National Park and Las Gemelas Seamount, Costa Rica

Starr

Cortés²,

Barnes

et al. 2017

Rev. Biol. Trop.

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The deepwater faunas of oceanic islands and seamounts of the Eastern Tropical Pacific are poorly known. From 11-22 September 2009, we conducted an exploration of the deepwater areas around Isla del Coco National Park and Las Gemelas Seamount, located about 50km southwest of Isla del Coco, Costa Rica using a manned submersible to survey the seafloor habitats. The goal of the exploration was to characterize the habitats and biota, and conduct quantitative surveys of the deepwater portions of Isla del Coco National Park and Las Gemelas. We completed a total of 22 successful submersible dives, spanning more than 80hr underwater, and collected a total of 36hr of video. With respect to invertebrates, our objectives were to gather quantitative information on species composition, density, distribution and habitat associations as well as to compare the invertebrate communities between the two sites. A total of 7172 invertebrates were counted from analysis of the video collected on this project. Larger organisms were counted and placed into 27 taxonomic groups to characterize the deepwater invertebrate fauna of Las Gemelas Seamount and Isla del Coco National Park. The Shannon-Weiner Index for biodiversity (H’) was calculated to be 0.14 ± 0.02 for Isla del Coco and 0.07 ± 0.03 for Las Gemelas surveys. Although richness was fairly equal between the two sites, evenness was greater at Isla del Coco (J = 0.04 ± 0.006) when compared to Las Gemelas (J = 0.02 ± 0.01). This lower level of evenness in the community at Las Gemelas was a result of high densities of a few dominant species groups, specifically sea urchins and black corals. We also evaluated invertebrate percent cover at both Isla del Coco and Las Gemelas Seamount with respect to habitat type, slope and rugosity. Results indicated that highly rugose habitats contained the highest frequencies of all invertebrates at both sites, with the exception of glass sponges and polychaetes at Isla del Coco, which were found in greater quantities at intermediate levels of rugosity. Information obtained from these submersible surveys indicate that seamounts in the tropical eastern Pacific Ocean may be an important source of biodiversity and that more quantitative surveys are needed to characterize the fauna of the region. Citation: Starr, R.M., J. Cortés, C.L. Barnes, K. Green & O. Breedy. 2012. Characterization of deepwater invertebrates at Isla del Coco National Park and Las Gemelas Seamounts, Costa Rica. Rev. Biol. Trop. 60 (Suppl. 3): 303-319. Epub 2012 Dec 01.

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Case studies on decapod crustaceans from the Philippines reveal deep, steep underwater slopes as prime habitats for ‘rare’ species

Cited by 5 publications

References 28 publications

Biogeography of the Indo-Australian Archipelago

Biogeography of the Indo-Australian Archipelago

Rarity and persistence

Characterization of deepwater invertebrates at Isla del Coco National Park and Las Gemelas Seamount, Costa Rica

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