Episodic recruitment in the saguaro cactus is driven by multidecadal periodicities

Ecology ◽  
2021 ◽  
Author(s):  
Ricardo E. Félix‐Burruel ◽  
Eugenio Larios ◽  
Edgar J. González ◽  
Alberto Búrquez
Keyword(s):  
Episodic Recruitment

Growth, episodic recruitment and age truncation in populations of a catadromous percichthyid, Macquaria colonorum

2010 ◽  
Vol 61 (4) ◽  
pp. 397 ◽  
Author(s):  
Chris T. Walsh ◽  
Charles A. Gray ◽  
Ron J. West ◽  
Dylan E. van der Meulen ◽  
Lindsay F. G. Williams
Keyword(s):  
Habitat Degradation ◽  
Environmental Flows ◽  
Anthropogenic Impacts ◽  
Fish Length ◽  
Commercial Fishing ◽  
Marginal Increment ◽  
History Of ◽  
Young Of The Year ◽  
Three Rivers ◽  
Episodic Recruitment

Temperate basses and perches (family Percichthyidae) worldwide have declined in distribution and abundance during the past few decades due to anthropogenic impacts such as fishing, habitat degradation and alteration to river flows. This study examined differences in the age, growth and longevity of Macquaria colonorum among three south-eastern Australian coastal rivers. Estimates of ages were made by counting opaque zones in sectioned otoliths. Ages were validated by using marginal increment analysis, staining fish otoliths with oxytetracycline and sampling young-of-the-year fish. Length-at-age data from 1644 fish indicated that growth of M. colonorum is rapid in the first 3 to 4 years, after which it slows considerably. Females grew faster and reached larger asymptotic lengths than males. The species was found to be long lived, with the oldest fish estimated at 41 years. Population age structures indicated variable year-class strengths in all three rivers and there was an absence of larger, older (>10 years) individuals in the populations from the two rivers with a history of commercial fishing. These results indicate that M. colonorum populations, similar to other global percichthyid and estuarine-dependent fishes, have been subjected to episodic recruitment and age truncation and that these are likely influenced by environmental flows and fishing pressure.

Episodic recruitment of youngProchilodus lineatus(Valenciennes, 1836) (Characiformes: Prochilodontidae) during high discharge in a floodplain lake of the River Paraná, Argentina

2019 ◽  
Vol 26 (3) ◽  
pp. 260-268 ◽  
Author(s):  
Ismael E. Lozano ◽  
Sabina Llamazares Vegh ◽  
María I. Gómez ◽  
Yanina G. Piazza ◽  
Javier L. Salva ◽  
...  
Keyword(s):  
Floodplain Lake ◽  
High Discharge ◽  
Episodic Recruitment

Virtual Population Analysis, Episodic Recruitment, and Harvest Management of Paddlefish with Applications to Other Acipenseriform Fishes

2014 ◽  
Vol 22 (1) ◽  
pp. 16-35 ◽  
Author(s):  
Dennis L. Scarnecchia ◽  
Youngtaik Lim ◽  
L. Fred Ryckman ◽  
K. Michael Backes ◽  
Shannon E. Miller ◽  
...  
Keyword(s):  
Population Analysis ◽  
Harvest Management ◽  
Virtual Population Analysis ◽  
Virtual Population ◽  
Episodic Recruitment

scholarly journals Low clonal propagation in Atlantic and Mediterranean populations of the red gorgonian Paramuricea clavata (Octocorallia)

2017 ◽  
Vol 81 (1) ◽  
pp. 103 ◽  
Author(s):  
Joanna Pilczynska ◽  
Joana Boavida ◽  
Silvia Cocito ◽  
Chiara Lombardi ◽  
Andrea Peirano ◽  
...  
Keyword(s):  
Clonal Propagation ◽  
Slow Growth ◽  
Clonal Reproduction ◽  
Mass Mortality ◽  
Ligurian Sea ◽  
Mediterranean Populations ◽  
High Recovery Rate ◽  
Paramuricea Clavata ◽  
Nw Mediterranean ◽  
Episodic Recruitment

Clonal propagation is a common feature of benthic marine organisms. In the present study, we investigated the contribution of clonal reproduction in the red gorgonian Paramuricea clavata. Mediterranean populations of P. clavata were severely affected by mass mortality events caused by increased water temperature in 1999 and 2003. The populations are characterized by slow growth and episodic recruitment, but after the observed mortalities, an unexpectedly high recovery rate was observed in the severely affected populations from the Ligurian Sea, NW Mediterranean. Ten years after the last mortality event, we investigated the contribution of clonal propagation in populations from the Ligurian Sea, where some populations were highly affected by mass mortality events, and from the Atlantic, where mortality was never observed. All individuals were genotyped for nine microsatellite loci. The contribution of clonal reproduction varied from 0% to 13% and did not differ significantly between affected and unaffected populations. We confirm by using genetic markers that clonal propagation in P. clavata is not common, and that the contribution of clones is too low to play an important role in red gorgonian reproduction and cannot contribute to population recovery at sites that have been affected by mass mortality events.

scholarly journals Surprising episodic recruitment and growth of Antarctic sponges: Implications for ecological resilience

2016 ◽  
Vol 482 ◽  
pp. 38-55 ◽  
Author(s):  
Paul Dayton ◽  
Shannon Jarrell ◽  
Stacy Kim ◽  
Simon Thrush ◽  
Kamille Hammerstrom ◽  
...  
Keyword(s):  
Ecological Resilience ◽  
Episodic Recruitment ◽  
Antarctic Sponges

Age determination of black bream, Acanthopagrus butcheri (Sparidae), from the Gippsland Lakes of south-eastern Australia indicates slow growth and episodic recruitment

1998 ◽  
Vol 49 (6) ◽  
pp. 491 ◽  
Author(s):  
Alexander K. Morison ◽  
Patrick C. Coutin ◽  
Simon G. Robertson
Keyword(s):  
Growth Parameters ◽  
Age Determination ◽  
Correct Identification ◽  
Frequency Distributions ◽  
South Eastern ◽  
Black Bream ◽  
Eastern Australia ◽  
Episodic Recruitment ◽  
Acanthopagrus Butcheri ◽  
South Eastern Australia

The age of black bream (Acanthopagrus butcheri) in the Gippsland Lakes of south-eastern Australia was estimated with high precision from sectioned otoliths of fish sampled from 1993 to 1996. Ageing techniques were validated by following the progression of age classes over 4 years. Correct identification of the first increment was aided by reference to the position of the subcupular meshwork fibre zone, and age assignment was confirmed by linear regression analyses of otolith weight against fish age. The growth of black bream was found to be slower, and their natural life span longer, than previously estimated from length–frequency distributions and scale readings. The maximum age recorded was 29 years, with most black bream 4–9 years old and few fish more than 10 years old. There were significant differences between the growth rates of males and females. The von Bertalanffy growth parameters were: L∞ 54.5 cm FL, t0 –5.21 years, K 0.042 year-1 for females and L∞ 38.2 cm FL, t0 –3.70 years, K 0.077 year-1 for males. The current age structure suggests that recruitment has been episodic since 1981 and low for three recent years in succession.

Evidence for episodic recruitment in a small opheliid polychaete species from the abyssal NE Atlantic

2001 ◽  
Vol 50 (1-4) ◽  
pp. 285-301 ◽  
Author(s):  
A. Vanreusel ◽  
N. Cosson-Sarradin ◽  
A.J. Gooday ◽  
G.L.J. Paterson ◽  
J. Galéron ◽  
...  
Keyword(s):  
Ne Atlantic ◽  
Polychaete Species ◽  
Episodic Recruitment
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