Para a história da autonomia dos Açores: a introdução forçada da fisiocracia no arquipélago

Santos, João Marinho dos

doi:10.14195/0870-4147_31-1_23

Cited by 2 publications

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“…After 1988 there is no 'official' commercial record of landings of S. mexicana along the Mexican coast. Something similar was documented in the Azores (Portugal), where P. candei and P. aspera were subject to uncontrolled harvesting until 1984, when the catch reached a peak of 97 t (Santos, Martins & Hawkins, 1990). Such intense harvesting resulted in a marked decline in the limpet populations, before the fishery collapsed in 1985 (Santos, Martins & Hawkins, 1990;Hawkins et al, 2000;Martins et al, 2008;Sousa et al, 2019).…”

Section: Introductionmentioning

confidence: 57%

Population status of the world's largest limpet,Scutellastra mexicana(Mollusca: Patellidae), on María Madre Island, Mexico: Possible last bastion of a species facing global extinction

Carballo,

Bautista‐Guerrero,

Benjamín

et al. 2023

Aquatic Conservation

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Scutellastra mexicana is the largest patellid in the world, with records of up to 35.5 cm in length, and is one of the most endangered marine invertebrates from tropical Pacific rocky shores. The decline of this species occurred during the 20th century, when fishing cooperatives reported the capture of millions of specimens in less than 2 decades (1970–1980). Since then, the species has continued to be captured illegally to the point that it has practically disappeared. This paper reports the population status of S. mexicana in María Madre Island (Mexican Pacific Ocean), which was used as a Federal Prison from 1905 until 2019. A total of 2,381 limpets were recorded in four main populations: Guayacama, Borbollones, Punta Halcones and Papelillos. The density was very low: from 0.05 to 0.3 individuals m−2, with an ageing population structure, and no recent recruitment. The size‐frequency distribution of the populations showed that most of the individuals were between 9 and 15 cm. Mean and maximum shell length varied between 10.5 and 19 cm at Papelillos, 13.6 and 20.3 cm at Punta Halcones, 13.7 and 17.6 cm at Borbollones, and 12 and 20 cm at Guayacama. Evidence of illegal extraction was evident in Papelillos since the size of the limpets was significantly the smallest of the four populations studied, and also significantly smaller than those in an adjacent midden. Now that the prison has been closed it is imperative to establish legal measures, to provide extreme protection of María Madre, and to change the current status of S. mexicana in the Official Mexican Standard (NOM‐059‐ECOL‐2010) from threatened species to in danger of extinction. This may be the last hope for the species.

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Section: Introductionmentioning

confidence: 57%

Population status of the world's largest limpet,Scutellastra mexicana(Mollusca: Patellidae), on María Madre Island, Mexico: Possible last bastion of a species facing global extinction

Carballo,

Bautista‐Guerrero,

Benjamín

et al. 2023

Aquatic Conservation

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“…In the Azores, intense harvesting contributed to the decline of limpets and their fishery collapsed in 1988 (Santos et al, 1990). Because of that, limpet harvesting was prohibited in 1989 across the entire archipelago.…”

Section: Introductionmentioning

confidence: 99%

“…In the Azores, intense harvesting contributed to the decline of limpets and their fishery collapsed in 1988 (Santos et al, 1990).…”

mentioning

confidence: 99%

The ecological value of fully enforced, no‐entry, marine protected areas: A case study of harvested limpets

Faria,

Vale,

Ribeiro

et al. 2024

Aquatic Conservation

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Harvesting of intertidal gastropods can lead to a direct reduction in the biomass of targeted species through a reduction in the numbers and size of individuals, in turn leading to extensive changes to the structure of intertidal communities. In the Azores, two patellid species co‐occur, and both are exploited for human consumption. However, one of these species, Patella aspera (Röding, 1798), is larger and has a greater economic value and is thus favoured in comparison to the smaller Patella candei (d'Orbigny, 1840). This study investigates the effects of human exploitation on the interaction between these two species by comparing their densities and sizes within two areas of a marine protected area (MPA): a no‐entry area where human access is strictly prohibited and an adjacent area where human access is allowed and collection still occurs despite it being prohibited. Patella aspera attained similar densities in the two areas, but individuals were much larger within the no‐entry MPA. In contrast, P. candei were more abundant in the adjacent area but were of a similar size as in the no‐entry MPA. Limpet biomass was much greater within the no‐entry MPA. The abundance (% cover) of upright macroalgae and barnacles as well as bare rock were also significantly reduced within the no‐entry MPA, where grazer‐resistant algal crusts cover was significantly greater. This study highlights the influence of human activities and how these may affect the complex dynamics of biotic interactions with wider community‐level cascading effects.

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Para a história da autonomia dos Açores: a introdução forçada da fisiocracia no arquipélago

Cited by 2 publications

References 0 publications

Population status of the world's largest limpet,Scutellastra mexicana(Mollusca: Patellidae), on María Madre Island, Mexico: Possible last bastion of a species facing global extinction

Population status of the world's largest limpet,Scutellastra mexicana(Mollusca: Patellidae), on María Madre Island, Mexico: Possible last bastion of a species facing global extinction

The ecological value of fully enforced, no‐entry, marine protected areas: A case study of harvested limpets

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