Reproductive Patterns of Pollicipes pollicipes (Cirripedia: Scalpellomorpha) on the Southwestern Coast of Portugal

Cruz, Teresa; Araújo, Jorge Corrêa de

doi:10.2307/1549232

Cited by 25 publications

(23 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Preliminary observations made in SW Portugal (Cruz, 2000) and in the RNB (Cruz et al, 2008) indicate that maximal size of a 1-year-old individual is 20-22 mm (RC). Barnacles are sexually mature with a RC≥12.5mm (Cruz and Araújo, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…In order to characterize the size structure of harvested barnacles and to determine whether the management regulation concerning size limit was being fulfilled, we collected ten sub-samples of barnacles ( These size classes were defined on the basis of their contribution to the reproductive status of the population (according to Cruz and Araújo, 1999) and estimated age (based on Cruz et al, 2010), and on their commercial relevance (personal observations): the first class corresponded to juveniles, the second to less than 1-year-old adults with low reproductive input, the third to fully matured individuals (<1 year old) with low commercial interest, the fourth to adults (mostly ≥1 year old) with commercial interest, and the fifth class to highly prized older individuals. The size limit rule of the management plan states that at least 50% of the harvest volume must contain individual barnacles with a RC ≥25mm (considered in the present paper as the fifth class.…”

Section: Harvesting Observationsmentioning

confidence: 99%

See 1 more Smart Citation

Management of the stalked barnacle (Pollicipes pollicipes) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Jacinto¹,

Cruz²,

Silva³

et al. 2011

Sci. Mar.

Self Cite

View full text Add to dashboard Cite

SUMMARY:The stalked barnacle Pollicipes pollicipes (Gmelin, 1790) is an important shellfish resource in Portugal. Due to the social-economic importance of barnacle harvesting, a management plan aimed at achieving a controlled and sustainable activity (including temporal and spatial closures, rotational harvesting, a limited number of harvesting licenses, bag and size limits for catches and catch reporting) was implemented in 2000 at the Berlengas Nature Reserve (RNB) in central Portugal. We evaluated the bag and size limits imposed by the management plan, performing observations on harvesting activity and asking licensed harvesters and RNB staff about these measures. Both inquiries and observations suggest that licensed harvesters are not following the bag and size limits imposed. Mean amounts captured in RNB varied from 14 to 24 kg per harvester/day, but 25% of the observations corresponded to higher catches per individual than the total amount allowed (20 kg). Only half of the sampled amounts (taken in autumn 2005 and 2006) were in agreement with the size limit regulation and 50% of the total biomass comprised individuals of maximal rostro-carinal length (RC) ≥25 mm. For most harvesters, size limit is the most difficult management rule to fulfil. Both harvesters and RNB staff agree that surveillance is scarce and is a major problem of this fishing activity. In order to achieve a more sustainable use of this resource, we propose the implementation of a more effective surveillance and monitoring plan, the definition of a unique landing site, the maintenance of the bag limit (20 kg) and a reduction of the size limit (50% of total biomass comprising individuals ≥22 mm RC).Keywords: stalked barnacles, Pollicipes, fishery, management, marine reserve, Portugal. RESUMEN: Gestión de la explotación de percebe (PolliciPes PolliciPes) en la Reserva Natural de Berlengas (Portugal): evaluación del tope de capturas y talla mínima. -El percebe Pollicipes pollicipes (Gmelin, 1790) es un recurso importante en Portugal. Debido a la importancia socioeconómica de la recolección de percebes y con objeto de alcanzar una actividad controlada y sostenible, se implementó en 2000 en la Reserva Natural de Berlengas (RNB; centro de Portugal) un plan de gestión para regular esta actividad (incluyendo el cierre temporal y espacial, rotación de la explotación, número limitado de licencias, topes de captura individual y talla mínima). Hemos evaluado los topes de captura y la talla mínima impuestos por el plan de gestión, realizando observaciones sobre la actividad de recolección y realizando encuestas a perceberos y personal de la RNB sobre tales medidas. Los perceberos no están siguiendo los topes de captura y los límites de tamaño establecidos. Las cantidades medias capturadas en la RNB han variado de 14 a 24 kg por mariscador/día, pero el 25% de las observaciones corresponden a las capturas por persona superior al importe total permitido (20 kg). Sólo la mitad de las muestras (tomadas en el otoño de 2005 y 2006) se mostró de acuerdo con ...

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Harvesting Observationsmentioning

confidence: 99%

Management of the stalked barnacle (Pollicipes pollicipes) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Jacinto¹,

Cruz²,

Silva³

et al. 2011

Sci. Mar.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For example, the incubation period of Balanus rostratus is 2 weeks at $43°N (Korn 1985). Brooding in Pollicipes pollicipes (Scalpellomorpha) lasts between 28 days and 96 days, depending upon the individual size and crowding level (Cruz and Arau´jo 1999). The estimated time for embryonic development in this species is 25 days.…”

Section: Discussionmentioning

confidence: 99%

Differential growth of the barnacle Notobalanus flosculus (Archaeobalanidae) onto artificial and live substrates in the Beagle Channel, Argentina

et al. 2005

View full text Add to dashboard Cite

In the Beagle Channel, southern South America (ca. 55°S 67°W), about 20% of false king crabs (Paralomis granulosa) >80 mm carapace length are fouled with the barnacle Notobalanus flosculus. To evaluate differences in growth rates of barnacles attached to artificial and live substrates, clay tiles were anchored as collectors to the bottom at two different sites in the Beagle Channel in September 1996: in Ushuaia harbour (low currents and high levels of suspended matter) and around the Bridges Islands (strong currents and low level of suspended matter). Another set of collectors was deployed at the same sites in October 1998 to collect barnacles for histological studies. Tiles were removed from each place, approximately, on a monthly basis. Carapaces of P. granulosa with the epizoic N. flosculus were sampled between November 1996 and 1997, and between March 1998 and September 1999, to study sexual maturation of barnacles. Growth of barnacles was compared between the collectors and P. granulosa carapaces following a qualitative approach. A sexual maturity scale was defined, based on the stage of development of the female reproductive apparatus of N. flosculus. Growth rate of barnacles was highest in the harbour, intermediate on P. granulosa, and lowest around the Bridges Islands. Presence of oocytes was registered only in epizoic barnacles, suggesting that at least a proportion of these individuals is able to spawn on the carapaces. The potential advantages of settling on a living substrate, namely increased availability of food particles and decreased predation risks are discussed.

show abstract

“…These temperatures are within the range normally experienced by this species in the wild (14-20°C, Sines, Portugal; Instituto Hidrográfico 2015), during the breeding season that occurs from May to October (Cruz and Araújo 1999). The water temperatures were checked daily (Juwel ® Digital Aquarium Thermometer) to ensure that they were maintained within ±1°C.…”

Section: Exp 2 Temperaturementioning

confidence: 97%

“…All abiotic factors tested (except temperature) affected permanent attachment, which was optimal under conditions of light, salinity and hydrodynamics similar to those experienced in nature. On the other hand, metamorphosis was affected by neither light nor hydrodynamism, but was higher at natural salinities and higher temperatures, conditions consistent with the breeding season (Cruz and Araújo 1999) and downwelling periods (Fiuza et al 1982). Although these observations might suggest that P. pollicipes cyprids could cope well with predicted temperature and salinity fluctuations in the North Atlantic Ocean, further studies should investigate the interaction of these factors, particularly within the context of climate change.…”

Section: Larval Condition Origin and Settlement Over Timementioning

confidence: 99%

Modulation of gregarious settlement of the stalked barnacle, Pollicipes pollicipes: a laboratory study

et al. 2016

Self Cite

View full text Add to dashboard Cite

Summary:Although recruitment patterns of Pollicipes pollicipes (Crustacea: Scalpelliformes) in the wild have been investigated, no studies have yet focused on the factors that affect settlement. In the present paper, settlement of P. pollicipes on conspecifics (gregarious settlement) was investigated in the laboratory as a function of environmental conditions (hydrodynamics, temperature, light and salinity), larval age and batch. This study aimed to understand how these factors modulate settlement in the laboratory and elucidate how they might impact recruitment patterns in nature. Maximum attachment on adults was 30-35%, with a one-week metamorphosis rate of 70-80%. Batch differences affected both attachment and metamorphosis. Attachment rate was higher at natural salinity (30-40 psu), with lower salinity (20 psu) decreasing metamorphosis rate. Cyprid attachment was stimulated by light conditions and circulating water. This might relate to a preference for positioning high in the water column in nature, but also to increased cyprid-surface contact in conditions of circulating water. Older cyprids (3 or 6 days) showed higher attachment than un-aged larvae, though fewer 6-day-old larvae metamorphosed. Temperature did not affect attachment rate, but the metamorphosis rate decreased at 14°C (compared with 17 or 20°C), implying that differences in temperature during the breeding season can affect how quickly cyprids metamorphose to the juvenile. Cyprids survived for prolonged periods (≥20 days; 40% survival), likely due to efficient energy saving by intercalating long periods of inactivity with fast bursts of activity upon stimulation.Keywords: stalked barnacles; larva; settlement; attachment; metamorphosis; cyprids; aquaculture. Modulación del asentamiento gregario del percebe, Pollicipes pollicipes: un estudio de laboratorioResumen: Aunque se han investigado los patrones de reclutamiento de Pollicipes pollicipes (Crustacea: Scalpelliformes) en la naturaleza, actualmente no existen estudios sobre los factores que afectan al asentamiento larval. En el presente trabajo, el asentamiento de larvas de P. pollicipes sobre adultos conspecíficos (asentamiento gregario) fue investigado en el laboratorio en función de las variables ambientales (hidrodinamismo, temperatura, luz y salinidad), la edad y los distintos lotes de larvas. Este estudio tuvo como objetivo comprender cómo estos factores afectaban al asentamiento en el laboratorio y elucidar el modo en que podrían afectar a los patrones de reclutamiento en el medio natural. La fijación máxima en adultos fue de 30-35%, con una tasa de metamorfosis de 70 a 80% en una semana. Las tasas de fijación y de metamorfosis variaron dependiendo de los distintos lotes de larvas. La tasa de fijación fue superior cuando la salinidad era la natural (30-40 psu), mientras que la tasa de metamorfosis disminuía cuando la salinidad era inferior (20 psu). La fijación de la larva cipris se estimulaba en condiciones de luz y agua circulante, lo que puede estar relacionado con la preferencia po...

show abstract

Reproductive Patterns of Pollicipes pollicipes (Cirripedia: Scalpellomorpha) on the Southwestern Coast of Portugal

Cited by 25 publications

References 0 publications

Management of the stalked barnacle (<i>Pollicipes pollicipes</i>) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Management of the stalked barnacle (<i>Pollicipes pollicipes</i>) fishery in the Berlengas Nature Reserve (Portugal): evaluation of bag and size limit regulation measures

Differential growth of the barnacle Notobalanus flosculus (Archaeobalanidae) onto artificial and live substrates in the Beagle Channel, Argentina

Modulation of gregarious settlement of the stalked barnacle, <em>Pollicipes pollicipes</em>: a laboratory study

Contact Info

Product

Resources

About