A review of the living New Zealand members of<i>Onithochiton</i>Gray, 1847 (Mollusca: Polyplacophora)

O'Neill, M. H. B.

doi:10.1080/03014223.1985.10428273

Cited by 6 publications

(3 citation statements)

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“…O. neglectus is a valuable system for exploring the influence of gene flow and environmental variability on local adaptation due to several factors: the broad distribution of the species, spanning a wide latitudinal gradient of environmental factors (O'Neill, 1985); the species' brooding development (Creese, 1986); and the differential level of gene flow mediated by the presence or absence of kelp rafting (Salloum et al, 2020). The first challenge of studying a system with such a strong background population structure is dealing with missing data when calling variants (Graham et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…O. neglectus is a brooding chiton, lacking a long‐lasting pelagic larval phase and with low‐motile adults (Creese, 1986). With a strikingly broad distribution for its low capacity to move, O. neglectus populations are present over a latitudinal gradient of environmental factors from the subtropical northern New Zealand to the subantarctic southern islands (O'Neill, 1985; Salloum et al, 2020). Previously, single‐locus markers ( COI , 16s and ITS‐1 ) detected three O. neglectus genetic clades, namely the North, Central and South clades (Salloum et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Finding the adaptive needles in a population‐structured haystack: A case study in a New Zealand mollusc

Salloum

Santure

Lavery

et al. 2022

Journal of Animal Ecology

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Genetic adaptation to future environmental conditions is crucial to help species persist as the climate changes. Genome scans are powerful tools to understand adaptive landscapes, enabling us to correlate genetic diversity with environmental gradients while disentangling neutral from adaptive variation. However, low gene flow can lead to both local adaptation and highly structured populations, and is a major confounding factor for genome scans, resulting in an inflated number of candidate loci. Here, we compared candidate locus detection in a marine mollusc (Onithochiton neglectus), taking advantage of a natural geographical contrast in the levels of genetic structure between its populations. O. neglectus is endemic to New Zealand and distributed throughout an environmental gradient from the subtropical north to the subantarctic south. Due to a brooding developmental mode, populations tend to be locally isolated. However, adult hitchhiking on rafting kelp increases connectivity among southern populations. We applied two genome scans for outliers (Bayescan and PCAdapt) and two genotype–environment association (GEA) tests (BayeScEnv and RDA). To limit issues with false positives, we combined results using the geometric mean of q‐values and performed association tests with random environmental variables. This novel approach is a compromise between stringent and relaxed approaches widely used before, and allowed us to classify candidate loci as low confidence or high confidence. Genome scans for outliers detected a large number of significant outliers in strong and moderately structured populations. No high‐confidence GEA loci were detected in the context of strong population structure. However, 86 high‐confidence loci were associated predominantly with latitudinally varying abiotic factors in the less structured southern populations. This suggests that the degree of connectivity driven by kelp rafting over the southern scale may be insufficient to counteract local adaptation in this species. Our study supports the expectation that genome scans may be prone to errors in highly structured populations. Nonetheless, it also empirically demonstrates that careful statistical controls enable the identification of candidate loci that invite more detailed investigations. Ultimately, genome scans are valuable tools to help guide further research aiming to determine the potential of non‐model species to adapt to future environments.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finding the adaptive needles in a population‐structured haystack: A case study in a New Zealand mollusc

Salloum

Santure

Lavery

et al. 2022

Journal of Animal Ecology

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“…Las investigaciones realizadas en el ámbito internacional son más numerosas y se han enfocado sobre las diversas especies de quitones, en aspectos relacionados con su taxonomía (Montoya, 1983;O´Neill, 1985;Kaas y Van Belle, 1998;Slieker, 2000), morfología (Baxter y Jones 1981;Cameron, 1982), biología reproductiva (Nagabhushanam y Deshpande, 1982;Deshpande y Nagabhushanam, 1983;Sakker, 1984) y dinámica poblacional y ecología (Cruz y Sotela, 1984;Otway, 1994;Grayson y Chapman, 2004;Kelaher y Cole, 2005).…”

Section: Introductionunclassified

Estructura poblacional de Chiton Articulatus en las Islas Pájaros y Venados de la Bahía de Mazatlán, Sinaloa, México

et al. 2007

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Resumen. El propósito del presente trabajo fue contribuir al conocimiento biológico y pesquero de Chiton articulatus, especie que se captura artesanalmente en las costas de Mazatlán, Sinaloa. Se realizaron recolectas bimestrales en la zona intermareal de las islas Pájaros y Venados, de febrero a diciembre de 2000, durante las mareas más bajas. Las recolectas se realizaron en 4 sitios distintos, 2 en la zona protegida frente a la bahía Mazatlán y 2 en la zona expuesta de ambas islas; los ejemplares se trasladaron al laboratorio para su identifi cación y registro de dimensiones corporales con un vernier (±0.1 mm) y una balanza (± 0.001g). Se analizaron 1 236 organismos, su longitud total (Lt) osciló entre 11.2 y 86.8 mm, su altura (Al) fue de 2.0 a 48.1 mm, su anchura (An) varió de 7.1 mm a 48.1 mm y su peso total (Pt) entre 0.1 y 53.8 g. La mayor parte de la población se distribuyó entre los 31 y 64 mm, con una moda de 41.1 mm y media de 45.6±8.5 mm de Lt. En la zona expuesta de isla Pájaros se presentaron mayores tallas, mientras que las menores se encontraron en la zona protegida de isla Venados; esta diferencia puede explicarse tanto por el grado de exposición al oleaje como por la presión de pesca, que se relaciona con la difi cultad de acceso en cada zona. Las relaciones biométricas entre las tallas fueron de tipo lineal {An=0.5423(Lt)+2.7594, Al=0.2316(Lt)-0.4576 y Al=0.3807(An)-0.3832} y entre talla y peso fueron de tipo potencial {Pt=0.0001(Lt) 2.8404 , Pt=0.0005(An) 2.8807 y Pt=0.0329(Al) 2.3236 }; los valores de la pendiente (b) de las relaciones entre la talla y el peso fueron cercanos a 3, por lo cual se considera que su crecimiento es de tipo isométrico. La relación entre el Pt y el peso del pie (Pp) fue {Pt=4.8778(Pp)+1.0933}. La proporción que se aprovecha de cada individuo es casi del 17 % de su Pt. La captura de C. articulatus es una actividad de subsistencia que diversos grupos realizan de manera temporal o complementaria de otras actividades. No existe ningún tipo de normatividad y/o vigilancia sobre su captura y comercialización. Palabras clave: moluscos, Chiton articulatus, Pacífi co este tropical, islas, distribución de tallas, pesca.

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Valve sculpturing and aesthete distributions in four species of Australian chitons (Mollusca: Polyplacophora)

Currie

1989

Journal of the Malacological Society of Australia

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A review of the living New Zealand members ofOnithochitonGray, 1847 (Mollusca: Polyplacophora)

Cited by 6 publications

References 7 publications

Finding the adaptive needles in a population‐structured haystack: A case study in a New Zealand mollusc

Finding the adaptive needles in a population‐structured haystack: A case study in a New Zealand mollusc

Estructura poblacional de Chiton Articulatus en las Islas Pájaros y Venados de la Bahía de Mazatlán, Sinaloa, México

Valve sculpturing and aesthete distributions in four species of Australian chitons (Mollusca: Polyplacophora)

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