Are the Temporal Changes Observed in the Reproductive Biology of the Estuarine Conguito Sea Catfish Related to Increased <scp>Small‐Scale</scp> Fishing Effort on the Northwestern Pacific Coast of Mexico?

Amezcua‐Linares, Felipe; Cruz‐González, Karen A.; Flores‐de‐Santiago, Francisco; Muro, Víctor Gabriel; Green, Lucinda; Amezcua, Felipe

doi:10.1002/mcf2.10217

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…Mangrove ecosystems are of the utmost importance to local communities as they provide commercial fishery products such as fish, shrimp, crabs, and molluscs (Arreguín-Sánchez et al, 2017;Amezcua-Linares et al, 2022); timber products such as firewood and construction materials that are valuable to the local people (Valdez Hernández, 2002, 2004Voorhies 2018); and recreational benefits such as ecotourism (Vargas-de-Río and Brenner, 2023).…”

Section: Key Processes and Interactionsmentioning

confidence: 99%

IUCN Red List of Ecosystems, Mangroves of the Warm Temperate Northeast Pacific

Valderrama-Landeros,

Flores-de-Santiago,

Ávila-Flores

et al. 2024

Preprint

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Mangroves of the Warm Temperate Northeast Pacific is a regional ecosystem subgroup (level 4 unit of the IUCN Global Ecosystem Typology). It includes the marine ecoregions of the South-Californian Pacific and the Gulf of California. The mapped extent of the Warm Temperate Northeast Pacific mangrove province in 2020 was 1,810.4 km², which represents 1.5% of the global mangrove area. There are three species of true mangroves that characterize the biota: Rhizophora mangle, Laguncularia racemosa and Avicennia germinans. These mangroves all grow on a southeast-northwest latitudinal axis, from greater to lesser structural complexity due to less favourable temperature conditions and availability of freshwater with increasing distance from the tropical zone. The main threats to the mangrove ecosystem in this region derive from changes in hydrological and sediment regimes, almost always related to the development of local infrastructure, such as canals and roads or the construction of upstream dams. Another emerging threat is the increased incidence of hurricanes in the region, which have affected large areas mainly in the last five years. Based on our analysis, it has been estimated that the Warm Temperate Northeast Pacific mangroves have expanded their coverage by 12.46 % since 1970. Nevertheless, the net area change has been -8.5 %. If this trend persists, it is anticipated that there will be 8.2 % reduction in coverage to 2055. Based on the IPCC RCP8.5 high sea-level rise scenario, it is estimated that the Warm Temperate Northeast Pacific mangroves will experience significant submergence of approximately 26.6 %, by the year 2060. Additionally, ~3 % of the mangrove ecosystem in the province is undergoing degradation currently, and this percentage is expected to increase to 8.7 % within the next 50 years. These estimated are based on a vegetation index decay analysis. The Warm Temperate Northeast Pacific mangrove ecosystem is currently assessed as Near Threatened (NT).

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Section: Key Processes and Interactionsmentioning

confidence: 99%

IUCN Red List of Ecosystems, Mangroves of the Warm Temperate Northeast Pacific

Valderrama-Landeros,

Flores-de-Santiago,

Ávila-Flores

et al. 2024

Preprint

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Reproductive Ecology of the Chilean Round Ray (Urotrygon chilensis, Günther, 1872) in the Southern Gulf of California

Alvarez-Fuentes

Tovar-Ávila

Payan-Alejo

et al. 2023

Fishes

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The Chilean round ray (Urotrygon chilensis, Günther, 1872) is commonly caught as bycatch in the Mexican Pacific, but changes in its reproductive ecology as a consequence of fishery effects have never been investigated. In this work, the reproductive ecology of this species was determined in the Southern Gulf of California (SGC). Total length (TL) ranged from 11.4 to 51.6 cm, and females were larger than males. Size at maturity (TL50) was estimated at 27.5 cm for females and 25.3 cm for males. The seasonal variation of mature individuals, the presence of pregnant females, the mean oocyte size, the size of embryos and the smallest free-living specimens along the year suggest the existence of two reproductive periods during the year in the SGC, and the size of birth was estimated to be 11.2 to 15.6 cm TL. The average fecundity was 2.14 embryos. Spatial variations detected in size at maturity, fecundity, and reproductive cycle along the Mexican Pacific coast suggest the presence of separated populations. Some of these differences could be related to differences in maximum size attained in each region, though fishing pressure and environmental factors could have an important role, too.

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Are the Temporal Changes Observed in the Reproductive Biology of the Estuarine Conguito Sea Catfish Related to Increased Small‐Scale Fishing Effort on the Northwestern Pacific Coast of Mexico?

Cited by 2 publications

References 49 publications

IUCN Red List of Ecosystems, Mangroves of the Warm Temperate Northeast Pacific

IUCN Red List of Ecosystems, Mangroves of the Warm Temperate Northeast Pacific

Reproductive Ecology of the Chilean Round Ray (Urotrygon chilensis, Günther, 1872) in the Southern Gulf of California

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