Results 11 to 20 of about 2,878 (177)

Time-varying flow-ecology relationships for an endangered fish population: Longfin Smelt in the San Francisco Estuary. [PDF]

Ecol Appl
Abstract Major estuaries globally are experiencing fast‐paced changes in hydrology and ecosystem dynamics. However, connecting alteration of river flow regimes to estuarine fish population dynamics remains a challenge, partly due to the untested assumption that flow regimes, fish dynamics, and the resulting flow–ecology relationships are stationary (i ...
Saffarinia P, Hobbs JA, Carlson SM, Ruhí A.   +3 more
europepmc   +2 more sources

Refining Zooplankton Diet Composition Studies Over Short and Long Time Scales by Combining 18S Metabarcoding With Fatty Acid Analyses. [PDF]

Mol Ecol Resour
ABSTRACT Understanding diet composition is essential for unravelling trophic interactions in aquatic ecosystems. DNA metabarcoding, utilising various variable regions of the 18S rRNA gene, is increasingly employed to investigate zooplankton diet composition.
Pauli NC, Metfies K, Neuhaus S, Graeve M, Cleary AC, Iversen MH, Meyer B.   +6 more
europepmc   +2 more sources

Are Sponges Good Natural Sentinels for Monitoring Fish Diversity in Antarctic Coastal Waters? [PDF]

Ecol Evol
This study demonstrates that eDNA metabarcoding using both water and sponge samples is an effective tool for monitoring fish biodiversity along the Western Antarctic Peninsula. The results revealed 14 endemic Antarctic fish species and one marine mammal, with water samples often offering a more comprehensive view than sponges.
Angulo-Preckler C, Turon M, Sacristan-Soriano O, Præbel K, Avila C, Wangensteen OS.   +5 more
europepmc   +2 more sources

Linking oceanic variability, euphausiid hotspot persistence, and marine predator distribution along Canada's west coast. [PDF]

Ecol Appl
Abstract Understanding patterns of habitat use across trophic levels and the physical drivers of multispecies aggregations is essential to inform ecosystem‐based management. To achieve this, we quantified the spatial distribution and co‐occurrence of hotspots (defined using the Getis‐Ord statistic) for euphausiids and nine of their commercially ...
Evans R, Gauthier S, Robinson CLK, English PA, Stanley C, Wright BM, Nichol L.   +6 more
europepmc   +2 more sources

DETERMINING OF OPERATIONAL PARAMETERS FOR TRAWL SYSTEM TAKING INTO ACCOUNT EXPERIMENTAL DATA ON SHAPE OF THE ROPE-NET SHELL OF MIDWATER TRAWLS

Известия ТИНРО, 2020
Calculating of horizontal opening for a trawl mouth using the mathematical model of midwater trawl system developed by V.I. Gabryuk gives the errors 25.4 and 32.9 %, on average, for the trawls RT 57/360 m and RT 80/396 m, respectively.
O. N. Kruchinin, E. A. Zakharov, D. L. Shabelsky   +2 more
doaj   +1 more source

Engineering calculation of a midwater fishing trawl

Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mekhanika, 2023
This paper presents a method for calculating the power and geometric properties of a midwater fishing trawl, which is a complicated engineering structure made up of tied flexible (threads, ropes, flap) and rigid (rigging, trawl boards) elements. A computational model, the functional relations for internal forces and geometric characteristics of the ...
Aleksey O. Razhev, Aleksandr A. Nedostup
openaire   +1 more source

Stocks and fishery of cod (Gadus macrocephalus, Gadidae) in the northwestern Bering Sea in 1965–2022

Известия ТИНРО, 2023
For pacific cod in the northwestern Bering Sea, biomass of the summer-fall feeding aggregations in the specified area of their highest density (polygon) is considered as a stock unit.
A. B. Savin
doaj   +1 more source

Field experiment on static characteristics of midwater trawl system. [PDF]

NIPPON SUISAN GAKKAISHI, 1991
A field experiment was conducted by FRV “Shinyo-maru” belonging to Tokyo University of Fisheries in order to make detailed measurements on operational characteristics of a mid-water trawl system. Time series data describing the net geometry and the towing loads occurring during hauls were measured by SCANMAR system (acoustic spreadmeter and netsonde ...
Ko Matuda, Fuxiang Hu, Kaname Satoh, Yujiro Saotome, Isao Kasuga   +4 more
openaire   +3 more sources

Biodiversity of commercially important finfish species caught by mid-water and bottom trawls from two different coasts of Arabian Sea: Threats and conservation strategies

Brazilian Journal of Biology, 2021
This study was conducted to estimate the diversity and the occurrence of commercially important finfish species collected by twenty fish sampling site of Sindh and Baluchistan coasts of the Arabian Sea in Pakistan from January to December 2019 ...
H. Ul-Hassan, S. Mahboob, Z. Masood, M. N. Riaz, S. Rizwan, F. Al-Misned, M.F.A. Abdel-Aziz, K. A. Al-Ghanim, K. Gabol, A.M. Chatta, N.A. Khan, Saeed, M. Waqar   +12 more
doaj   +1 more source

Intraspecific variation in prey quality affects the consumption rates of top predators. [PDF]

J Anim Ecol
This study reveals overlooked intraspecific variation in prey quality and its influence on predator energy budgets. By identifying key ecological drivers, we emphasize the need to integrate such variability into bioenergetic models to improve predictions of predator foraging and ecosystem responses to environmental change.
Nehasil SE, Zwolinski JP, Dorval E, Kurle CM.   +3 more
europepmc   +2 more sources