The role of intraguild predation in the population dynamics of small pelagic fish

2011 ◽  
Vol 158 (8) ◽  
pp. 1683-1690 ◽  
Author(s):  
Xabier Irigoien ◽  
André de Roos
Keyword(s):  
Population Dynamics ◽  
Intraguild Predation ◽  
Pelagic Fish ◽  
Small Pelagic Fish

More Modules

2011 ◽  
Author(s):  
Kevin S. McCann
Keyword(s):  
Population Dynamics ◽  
Food Webs ◽  
Empirical Evidence ◽  
Intraguild Predation ◽  
Weak Interactions ◽  
Apparent Competition ◽  
Trade Offs ◽  
Variable Population ◽  
The Stability

This chapter considers four-species modules and the role of generalism (effectively a three-species module with a consumer feeding on two resources). It first examines how generalists affect the dynamics of food webs by focusing on a set of modules that contrast generalist consumer dynamics relative to the specialist case. It then discusses organismal trade-offs that play a role in governing the diamond food web module and the intraguild predation module, arguing that such tradeoffs influence the flux of matter, the organization of interaction strengths, and ultimately the stability of communities. The chapter also reviews empirical evidence showing that apparent competition and the diamond module with and without intraguild predation are ubiquitous, and that weak interactions in simple modules seem to promote less variable population dynamics.

scholarly journals Evidence of a variable “unsampled” pelagic fish biomass in shallow water (<20 m): the case of the Gulf of Lion

2006 ◽  
Vol 63 (3) ◽  
pp. 444-451 ◽  
Author(s):  
P. Brehmer ◽  
J. Guillard ◽  
Y. Guennégan ◽  
J.L. Bigot ◽  
B. Liorzou
Keyword(s):  
Time Series ◽  
Population Dynamics ◽  
Shallow Water ◽  
Pelagic Fish ◽  
Fish Density ◽  
Fish Biomass ◽  
Small Pelagic Fish ◽  
Fish Stocks ◽  
Gulf Of Lion ◽  
Bottom Depth

Abstract Studies of small pelagic fish biomass are limited by the fact that research vessels and fishing boats are usually restricted to working areas with a bottom depth >20 m. Consequently, “unsampled” areas can represent a large proportion of the continental shelf, and the biomass in those areas can be important and must be taken into account in assessment methods in order to avoid misleading interpretations in population dynamics. A time-series ten years long has been compiled from acoustic-assessment surveys of small pelagic fish stocks, and the results show an overall increase in the acoustic fish density towards the coast, where values were the highest. Additional experiments on transects covering shallow-water areas (5–20 m) were conducted from 2001 to 2003 with small boats and a research vessel to evaluate the acoustic fish density in those areas. The results confirmed that the fish biomass in shallow water is significant, sometimes very large, and should be evaluated to avoid underestimation. Therefore, surveys should be conducted in shallow water, if at all possible, as well as at greater depths when carrying out surveys destined to support assessment exercises.

Intraguild predation between small pelagic fish in the Bay of Biscay: impact on anchovy (Engraulis encrasicolus L.) egg mortality

2015 ◽  
Vol 162 (6) ◽  
pp. 1351-1369 ◽  
Author(s):  
Eneko Bachiller ◽  
Unai Cotano ◽  
Leire Ibaibarriaga ◽  
Maria Santos ◽  
Xabier Irigoien
Keyword(s):  
Intraguild Predation ◽  
Pelagic Fish ◽  
Bay Of Biscay ◽  
Small Pelagic Fish ◽  
Engraulis Encrasicolus ◽  
Egg Mortality

scholarly journals DINAMIKA PERIKANAN PAYANG DI PERAIRAN UTARA KARAWANG DAN SEKITARNYA

2019 ◽  
Vol 25 (4) ◽  
pp. 253
Author(s):  
Mohamad Adha Akbar ◽  
Mufti Petala Patria
Keyword(s):  
Sustainable Management ◽  
Field Survey ◽  
Weather Conditions ◽  
Pelagic Fish ◽  
Environmental Data ◽  
Fishing Gear ◽  
Small Pelagic Fish ◽  
Business System ◽  
Daily Scale

Perikanan skala kecil terutama perikanan payang merupakan salah satu tulang punggung mata pencaharian masyarakat pesisir di perairan Karawang, Jawa Barat. Peran nyata aktivitas perikanan pada keanekaragaman sumberdaya hayati laut adalah memanfaatkan sumberdaya hayati perairan laut di kawasan pesisir dengan kondisi kelimpahan sumberdaya ikan yang cenderung berfluktuasi pada tingkat yang relatif rendah. Penelitian dilakukan melalui survey lapang pada kurun waktu Agustus – Nopember 2018 dengan basis data hasil tangkapan dan upaya penangkapan pada rentang waktu 2016-2018. Beberapa data lingkungan terkait ragam keadaan cuaca yang digambarkan oleh data curah hujan, arah dan kecepatan angin digunakan untuk menggambarkan siklus adaptasi nelayan untuk mempertahankan mata pencariannya. Aktivitas penangkapan menggunakan perahu dengan tonase <10 GT dan rerata kekuatan mesin sekitar 20 PK, beroperasi dalam skala harian dengan alat penangkapan ikan utama adalah jaring payang. Perkembangan tahunan indeks kelimpahan sumberdaya ikan dengan alat tangkap payang pada kurun waktu 2004-2008 dan 2015-2018 cenderung menurun. Tahun 2004 nilai indeks kelimpahan sumberdaya ikan sebesar 268 kg/trip menjadi 199 kg/trip pada 2008 dan terus menipis menjadi sebesar 115 kg/trip tahun 2018. Hal ini mengindikasikan usaha perikanan cenderung berada pada kondisi tidak berkelanjutan bila tidak dilakukan pengelolaan. Keberlanjutan usaha perikanan masih dapat diharapkan jika dilakukan perubahan terhadap sistem usaha yang lebih bersifat menjadi gabungan individu perahu yang berukuran kecil menjadi usaha kelompok dengan perahu yang berukuran lebih besar diatas 10 GT dengan daerah penangkapan yang lebih jauh.One day pelagic seine (payang) fisheries, is one of the backbones of coastal community livelihoods in North Karawang waters, West Java. The significant role of fisheries activities to harvest small pelagic fish resource in coastal areas indicated that the monthly CPUE tend fluctuated and stabil at low level. The study was conducted through a field survey in the period August - November 2018 with a database of catches and efforts from 2016-2018. Some environmental data related to various weather conditions illustrated by rainfall data, wind direction and speed are used to describe the adaptation cycle of fishermen to maintain their livelihoods. Fishing activities using boat with tonnage <10 GT and average engine strength of around 20 PK, operating on a daily scale with the main fishing gear is payang net. The average annual catch per trip (CPUE) of payang fisheries within period of 2004-2008 to 2015-2018 tend to decrease. In 2004 the CPUE was 268 kg/trip then 2008 at 199 kg / trip, and continue to lower index in 2018 of 115 kg / trip. This indicates that the fishery business is suspected to be in an unsustainable condition if no sustainable management is carried out. Sustainability of the fisheries business can still be expected if changes are made to the business system which is more a combination of individual small-sized boats into group businesses with boats larger than 10 GT with more distant fishing grounds.

scholarly journals Endogenous, Climate, and Fishing Influences on the Population Dynamics of Small Pelagic Fish in the Southern Humboldt Current Ecosystem

2020 ◽  
Vol 7 ◽  
Author(s):  
T. Mariella Canales ◽  
Mauricio Lima ◽  
Rodrigo Wiff ◽  
Javier E. Contreras-Reyes ◽  
Ursula Cifuentes ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Humboldt Current

scholarly journals THE IMPORTANCE OF GREY LITERATURE IN FISHERIES ECOLOGY: AN EXAMPLE BASED ON THE THROPHIC ROLE OF SMALL PELAGICS IN THE GULF OF CALIFORNIA

2010 ◽  
Vol 25 (1) ◽  
pp. 59
Author(s):  
M. A. Tripp-Valdez ◽  
S. E. Lluch-Cota ◽  
P. Del Monte-Luna ◽  
C. Salvadeo
Keyword(s):  
Gulf Of California ◽  
Online Survey ◽  
Grey Literature ◽  
Pelagic Fish ◽  
Trophic Relationships ◽  
Detailed Data ◽  
Small Pelagic Fish ◽  
Fisheries Ecology

Grey literature has been, in general, rejected from peer reviewed journals due to the lack of specialized revision and because they are difficult to trace. However, this information may contain detailed data that cannot be found in commercial reviewed journals. In order to assess the importance of grey literature in fisheries ecology, we made an online survey of indexed journals as well as thesis dissertations, technical papers and abstracts from proceedings reporting the trophic relationships of small pelagic fish in the Gulf of California. We obtained 57 bibliographic references from which 36 are considered grey literature, and these would represent a loss of more than 60% of information. This bias can lead to erroneous conclusions in studies and applications derived from such information. La importancia de la literatura gris en la ecología pesquera: un ejemplo basado en el papel de los pelágicos menores en el Golfo de California La literatura gris suele considerase como una fuente de información cuestionable en revistas y publicaciones científicas debido a que carece de una revisión especializada y a que puede constituirse de documentos difíciles de rastrear. Sin embargo, brinda información detallada y de calidad que no se encuentra en las publicaciones con arbitraje estricto. Con el objetivo de ilustrar la importancia de la literatura gris en el ámbito de la ecología pesquera, se realizó una búsqueda en línea de publicaciones en revistas indexadas, en tesis de grado, reportes técnicos y resúmenes de congresos donde se reportan las relaciones tróficas de los pelágicos menores con especies de diversos taxa en el Golfo de California. Se obtuvieron 57 referencias bibliográficas de las cuales 36 son consideradas como literatura gris. Excluir los datos contenidos en estas fuentes de los análisis que se lleven a cabo sobre el tema, podría representar una pérdida de más del 60% de la información disponible. Este sesgo tiene el potencial de producir conclusiones incompletas o erróneas en los estudios de la dinámica trófica de los pelágicos menores en el Golfo de California.

The box-balance model: a new tool to assess fish larval survival, applied to field data on two small pelagic fish

2020 ◽  
Vol 650 ◽  
pp. 289-308 ◽  
Author(s):  
V Raya ◽  
J Salat ◽  
A Sabatés
Keyword(s):  
Field Data ◽  
Fish Larvae ◽  
Larval Growth ◽  
Warming Trend ◽  
Mortality Rates ◽  
Larval Survival ◽  
Pelagic Fish ◽  
Balance Model ◽  
Small Pelagic Fish ◽  
Mesoscale Structures

This work develops a new method, the box-balance model (BBM), to assess the role of hydrodynamic structures in the survival of fish larvae. The BBM was applied in the northwest Mediterranean to field data, on 2 small pelagic fish species whose larvae coexist in summer: Engraulis encrasicolus, a dominant species, and Sardinella aurita, which is expanding northwards in relation to sea warming. The BBM allows one to quantify the contribution of circulation, with significant mesoscale activity, to the survival of fish larvae, clearly separating the effect of transport from biological factors. It is based on comparing the larval abundances at age found in local target areas, associated with the mesoscale structures (boxes), to those predicted by the overall mortality rate of the population in the region. The application of the BBM reveals that dispersion/retention by hydrodynamic structures favours the survival of E. encrasicolus larvae. In addition, since larval growth and mortality rates of the species are required parameters for application of the BBM, we present their estimates for S. aurita in the region for the first time. Although growth and mortality rates found for S. aurita are both higher than for E. encrasicolus, their combined effect confers a lower survival to S. aurita larvae. Thus, although the warming trend in the region would contribute to the expansion of the fast-growing species S. aurita, we can confirm that E. encrasicolus is well established, with a better adapted survival strategy.

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