Spatio-temporal variability of the surf-zone fauna of two Ecuadorian sandy beaches

2016 ◽  
Vol 67 (5) ◽  
pp. 566 ◽  
Author(s):  
Jose R. Marin Jarrin ◽  
Sandra L. Miño Quezada ◽  
Luis E. Dominguez-Granda ◽  
Sonnia M. Guartatanga Argudo ◽  
Maria del Pilar Cornejó R. de Grunauer
Keyword(s):  
Early Life ◽  
Surf Zone ◽  
Sandy Beaches ◽  
Environmental Stability ◽  
Life Stages ◽  
Early Life Stages ◽  
Tropical Environments ◽  
Crab Larvae ◽  
Tropical Areas ◽  
Spatio Temporal

Temperate and subtropical sandy beach surf zones present diverse and abundant fauna that are important in local food webs. However, dynamics of these fauna have been poorly studied in tropical areas. The aims of the present study were to describe the small swimming surf-zone fauna (~1–5mm in length) of two Ecuadorian sandy beaches, determine whether this fauna varies with beach, season or tide, and explore the environmental factors correlated with faunal variability. Beaches were sampled in wet and dry seasons during high, mid- and low tide (2001–2002) by using a hyperbenthic sledge. Beaches were inhabited by an abundant and diverse fauna (>1200 individuals per 100m2 and >30 taxa), where most individuals were in their early life stages (65%), and the dominant taxa included mysid shrimp (>40% of individuals) and fish and crab larvae (>25 taxa). Composition of groups that are present during their entire life or only early life stages varied most strongly between beaches, potentially because of differences in wave exposure and the influence of an adjacent river, and between seasons with changes in coastal oceanic currents. These results suggest that despite the environmental stability often portrayed for tropical environments, Ecuadorian surf-zone fauna are spatially and temporally variable.

Spatio-temporal development of CYP1 activity in early life-stages of zebrafish (Danio rerio)

2010 ◽  
Vol 100 (1) ◽  
pp. 38-50 ◽  
Author(s):  
Jens C. Otte ◽  
Annette D. Schmidt ◽  
Henner Hollert ◽  
Thomas Braunbeck
Keyword(s):  
Danio Rerio ◽  
Early Life ◽  
Life Stages ◽  
Temporal Development ◽  
Early Life Stages ◽  
Spatio Temporal

Spatio-temporal distribution of polar cod (Boreogadus saida) and saffron cod (Eleginus gracilis) early life stages in the Pacific Arctic

Polar Biology ◽  
2019 ◽  
Vol 42 (5) ◽  
pp. 969-990 ◽  
Author(s):  
Cathleen D. Vestfals ◽  
Franz J. Mueter ◽  
Janet T. Duffy-Anderson ◽  
Morgan S. Busby ◽  
Alex De Robertis
Keyword(s):  
Early Life ◽  
Temporal Distribution ◽  
Polar Cod ◽  
Life Stages ◽  
Boreogadus Saida ◽  
Early Life Stages ◽  
The Pacific ◽  
Polar Cod Boreogadus Saida ◽  
Saffron Cod ◽  
Spatio Temporal

The influence of selected environmental parameters and habitat mosaics on fish assemblages in a South American estuary

2018 ◽  
Vol 99 (1) ◽  
pp. 249-257
Author(s):  
Michelle Sequine Bolzan ◽  
Ryan Andrades ◽  
Henry Louis Spach ◽  
Mauricio Hostim-Silva
Keyword(s):  
Fish Species ◽  
Early Life ◽  
River Estuary ◽  
Environmental Parameters ◽  
Sandy Beaches ◽  
Habitat Modification ◽  
Life Stages ◽  
Early Life Stages ◽  
Important Species ◽  
Heterogeneous Habitats

Coastal environments are faced with constant habitat modification and biodiversity loss due to human occupation. Estuaries are considered to be highly productive and shelter heterogeneous habitats such as mangrove forests, tidal creeks, tidal mud flats and sandy beaches, which are important for the maintenance of natural resources. The present study aims to evaluate how different shallow juvenile habitats (sandy beaches, mangrove shoreline habitats and dense macrophyte habitats) influence fish during their early life stages in a tropical estuary of Brazil. Monthly samples using a beach seine net from July 2012 to June 2013 were collected in eight shallow areas of the São Mateus River estuary. The fish assemblage comprised mainly juvenile and small-sized fish, which included ecologically and commercially important species. Small recruits of Atherinella brasiliensis and Ctenogobius boleosoma were most abundant in the autumn, while Rhinosardinia bahiensis and Centropomus undecimalis were highly abundant during the winter. The water salinity recorded in the mid and lower estuarine portions was the most important variable for the distribution of A. brasiliensis and Sphoeroides spengleri, whereas Anchovia clupeoides, C. undecimalis, C. parallelus and Gobionellus oceanicus were positively correlated with the water depth of the upper estuarine portion. The fish species T. paulistanus, Genidens genidens and Achirus lineatus were related to the water turbidity in the upper portion. Thus, the heterogeneous shallow water habitats (and their associated environmental parameters) of the São Mateus River estuary are potential nursery grounds for the early life stages of a variety of fish species, which highlights the importance of these areas for local biodiversity management.

scholarly journals Match-mismatch dynamics in the Norwegian-Barents Sea system

2020 ◽  
Vol 650 ◽  
pp. 81-94
Author(s):  
ASA Ferreira ◽  
LC Stige ◽  
AB Neuheimer ◽  
B Bogstad ◽  
N Yaragina ◽  
...  
Keyword(s):  
Early Life ◽  
Barents Sea ◽  
Mechanistic Explanation ◽  
Trophic Levels ◽  
Calanus Finmarchicus ◽  
Life Stages ◽  
Early Life Stages ◽  
Predator Prey ◽  
Spatio Temporal ◽  
Prey Overlap

A key process affecting variation in the recruitment of fish into fisheries is the spatio-temporal overlap between prey and predator (match-mismatch hypothesis, MMH). The Northeast Arctic cod Gadus morhua and its dominant prey, the copepod Calanus finmarchicus, have long been studied in the Norwegian-Barents Sea system. However, the mechanistic explanation of how cod survival is affected by MMH dynamics remains unclear. Most MMH studies have focused on either the time synchrony or the spatial overlap between trophic levels. Here, we used G. morhua larvae and C. finmarchicus data collected in the Norwegian-Barents Sea via ichthyoplankton surveys from 1959-1992 to assess the effect of the predator-prey relationship on predator recruitment to the fisheries at age 3 (as a measure of survival) and to develop a metric of predator-prey overlap using spatio-temporal statistical models. We then compared the interannual variability of the predator-prey overlap with the predator’s abundance at recruitment to assess how MMH dynamics explain the survival of cod during its early life stages. We found that the amount of overlap between cod larvae (length: 11-15 mm) and their prey explained 29% of cod recruitment variability. Positive correlations between predator-prey overlap and subsequent recruitment were also found for predators of 6-10 and 16-20 mm, but not for 21+ mm. This improved predator-prey overlap metric is thus (1) useful to better understand how predator-prey dynamics at early life stages of fish impact the survival of later stages; and (2) a valuable tool for assessing the state of an ecosystem.

Natural and anthropogenic effects on the early life stages of European anchovy in one of its essential fish habitats, the Guadalquivir estuary

2019 ◽  
Vol 617-618 ◽  
pp. 67-79 ◽  
Author(s):  
GF de Carvalho-Souza ◽  
E González-Ortegón ◽  
F Baldó ◽  
C Vilas ◽  
P Drake ◽  
...  
Keyword(s):  
Early Life ◽  
Anthropogenic Effects ◽  
Life Stages ◽  
Early Life Stages ◽  
European Anchovy ◽  
Guadalquivir Estuary ◽  
Fish Habitats
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