Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico

Mesophotic reefs are found at depths of the ocean defined by the amount of incident light (1%–10% of light found at the surface). These ecosystems remain unexplored in many regions, including the Pacific region along the coast of Mexico, given the difficulty of accessing them using traditional metho...

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Hlavní autoři:	Velasco-Lozano, Manuel F, Ramírez-Ortiz, Georgina, Reyes-Bonilla, Héctor, Hollarsmith, Jordan A
Médium:	info:eu-repo/semantics/article
Jazyk:	eng
Vydáno:	Iniversidad Autónoma de Baja California 2020
Témata:	remotely operated vehicles species richness functional volume trophic level biogeographic provinces vehículos operados remotamente riquezas de especies volumen funcional nivel trófico provincias biogeográficas
On-line přístup:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3112
Tagy:	Přidat tag Žádné tagy, Buďte první, kdo otaguje tento záznam!

id	repositorioinstitucional-20.500.12930-7585
record_format	dspace
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	remotely operated vehicles species richness functional volume trophic level biogeographic provinces vehículos operados remotamente riquezas de especies volumen funcional nivel trófico provincias biogeográficas
spellingShingle	remotely operated vehicles species richness functional volume trophic level biogeographic provinces vehículos operados remotamente riquezas de especies volumen funcional nivel trófico provincias biogeográficas Velasco-Lozano, Manuel F Ramírez-Ortiz, Georgina Reyes-Bonilla, Héctor Hollarsmith, Jordan A Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
description	Mesophotic reefs are found at depths of the ocean defined by the amount of incident light (1%–10% of light found at the surface). These ecosystems remain unexplored in many regions, including the Pacific region along the coast of Mexico, given the difficulty of accessing them using traditional methods, such as scuba. Using a remotely operated vehicle, we characterized fish assemblages across rock and sand habitat at mesophotic depths around continental islands in the Gulf of California and oceanic islands in the Revillagigedo Archipelago in Mexico. We conducted 78 video-transect surveys and identified observed fish to the lowest taxonomic level possible. Using species’ presence per video-transect, we calculated traditional diversity indices (species richness, taxonomic distinctness, and trophic level) and functional indices (number of functional entities, functional richness, and functional volume) for each island group and habitat type. The model results indicated that habitat type was the most important factor for predicting mesophotic fish diversity. The functional indices showed higher values for the rocky reefs of oceanic islands than for the sandy habitats, driven primarily by the presence of elasmobranchs and commercially important transpacific species. While the values of taxonomic distinctness and functional diversity could indicate that the mesophotic reefs in the oceanic island group are more ecologically intact than those around the continental islands, it will require more exploration to determine if this condition persists over time and if these ecosystems could serve as refuges for commercial fish species against the increasing number of disturbances impacting shallow reefs.
format	info:eu-repo/semantics/article
author	Velasco-Lozano, Manuel F Ramírez-Ortiz, Georgina Reyes-Bonilla, Héctor Hollarsmith, Jordan A
author_facet	Velasco-Lozano, Manuel F Ramírez-Ortiz, Georgina Reyes-Bonilla, Héctor Hollarsmith, Jordan A
author_sort	Velasco-Lozano, Manuel F
title	Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
title_short	Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
title_full	Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
title_fullStr	Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
title_full_unstemmed	Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico
title_sort	fish assemblages at mesophotic depths in the pacific: a comparison between continental and oceanic islands of mexico
publisher	Iniversidad Autónoma de Baja California
publishDate	2020
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3112
_version_	1792609468344696832
spelling	repositorioinstitucional-20.500.12930-75852023-05-09T14:30:48Z Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico Ensamblajes de peces en la zona mesofótica del Pacífico: una comparación entre islas continentales y oceánicas de México Velasco-Lozano, Manuel F Ramírez-Ortiz, Georgina Reyes-Bonilla, Héctor Hollarsmith, Jordan A remotely operated vehicles species richness functional volume trophic level biogeographic provinces vehículos operados remotamente riquezas de especies volumen funcional nivel trófico provincias biogeográficas Mesophotic reefs are found at depths of the ocean defined by the amount of incident light (1%–10% of light found at the surface). These ecosystems remain unexplored in many regions, including the Pacific region along the coast of Mexico, given the difficulty of accessing them using traditional methods, such as scuba. Using a remotely operated vehicle, we characterized fish assemblages across rock and sand habitat at mesophotic depths around continental islands in the Gulf of California and oceanic islands in the Revillagigedo Archipelago in Mexico. We conducted 78 video-transect surveys and identified observed fish to the lowest taxonomic level possible. Using species’ presence per video-transect, we calculated traditional diversity indices (species richness, taxonomic distinctness, and trophic level) and functional indices (number of functional entities, functional richness, and functional volume) for each island group and habitat type. The model results indicated that habitat type was the most important factor for predicting mesophotic fish diversity. The functional indices showed higher values for the rocky reefs of oceanic islands than for the sandy habitats, driven primarily by the presence of elasmobranchs and commercially important transpacific species. While the values of taxonomic distinctness and functional diversity could indicate that the mesophotic reefs in the oceanic island group are more ecologically intact than those around the continental islands, it will require more exploration to determine if this condition persists over time and if these ecosystems could serve as refuges for commercial fish species against the increasing number of disturbances impacting shallow reefs. Los arrecifes mesofóticos se encuentran en una capa del océano definida por la cantidad de luz incidente (1%–10% con respecto a la superficie). Estos ecosistemas permanecen inexplorados en algunas regiones, como el Pacífico a lo largo de la costa mexicana, debido al difícil acceso mediante métodos tradicionales como el buceo autónomo. Se utilizó un vehículo operado remotamente para caracterizar los ensamblajes de peces de arrecifes rocosos y zonas arenosas en profundidades mesofóticas alrededor de islas continentales del golfo de California e islas oceánicas del archipiélago de Revillagigedo (México). Se realizaron 78 video-transectos y se identificaron los peces observados al mínimo taxón posible. Con base en la presencia de especies por video-transecto, se calcularon índices de diversidad tradicionales (riqueza de especies, diferenciación taxonómica y nivel trófico) e índices funcionales (número de entidades funcionales, riqueza funcional y volumen funcional) para cada conjunto insular y tipo de hábitat. Los modelos aplicados señalaron que el tipo de hábitat es el factor con mayor efecto en la diversidad de peces mesofóticos. Los índices funcionales presentaron mayores valores para los arrecifes rocosos de islas oceánicas que para los hábitats arenosos, lo que se asocia con la presencia de elasmobranquios y especies transpacíficas de importancia comercial. Aunque los valores de diferenciación taxonómica y diversidad funcional podrían indicar que los arrecifes mesofóticos del conjunto oceánico se encuentran en mejor estado de conservación que los del conjunto continental, se requiere mayor exploración para determinar si esta condición perdura en el tiempo y si estos ecosistemas pueden ser un refugio para especies comerciales ante el creciente impacto de disturbios en arrecifes someros. 2020-12-18 2021-06-03T03:55:45Z 2021-06-03T03:55:45Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3112 10.7773/cm.v46i4.3112 https://hdl.handle.net/20.500.12930/7585 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/3112/420420515 Copyright (c) 2020 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 46 No. 4 (2020); 321–342 Ciencias Marinas; Vol. 46 Núm. 4 (2020); 321–342 2395-9053 0185-3880

Fish assemblages at mesophotic depths in the Pacific: a comparison between continental and oceanic islands of Mexico

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