Spatial and dietary overlap in the Georges Bank groundfish community

2000 ◽  
Vol 57 (8) ◽  
pp. 1679-1691 ◽  
Author(s):  
Lance P Garrison
Keyword(s):  
Seasonal Changes ◽  
Fish Community ◽  
Trophic Structure ◽  
Prey Size ◽  
Georges Bank ◽  
Dietary Overlap ◽  
Ontogenetic Changes ◽  
Spatial Partitioning ◽  
Spatial Overlap ◽  
Trophic Resource

Patterns in spatial and trophic resource partitioning in the fish community of the Georges Bank region are identified, accounting for size-based changes in diets. During autumn and spring, this community is divided into geographic assemblages of species that have high spatial overlap. Similarity in spatial distribution is primarily related to similarity in depth preferences, and seasonal differences in species composition within assemblages are related to migrations. There is also important trophic structure within the Georges Bank community separating predators based upon prey size and location in the water column. Ontogenetic changes in diets are an important feature of the trophic structure in this system, particularly in the major piscivores. Seasonal changes in trophic structure reflect both predator and prey migrations. Dietary overlap among predator types is independent of either spatial overlap or depth preferences. There is spatial segregation within trophic guilds, and this spatial partitioning reduces the potential for exploitative competition within this community. Given the observed spatial patterns in trophic structure, the geographic assemblages on Georges Bank may be considered ecologically distinct functional units within this ecosystem.

Trophic structure of a fish community along environmental gradients of a subtropical river (Paraitinga River, Upper Tietê River Basin, Brazil)

Hydrobiologia ◽  
2007 ◽  
Vol 598 (1) ◽  
pp. 373-387 ◽  
Author(s):  
Katharina Eichbaum Esteves ◽  
Ana Valéria Pinto Lobo ◽  
Marcos Daniel Renó Faria
Keyword(s):  
River Basin ◽  
Fish Community ◽  
Trophic Structure ◽  
Environmental Gradients ◽  
Tietê River

scholarly journals Morphological correlates of prey consumed by Podarcis melisellensis (Braun, 1877) and P. siculus (Rafinesque, 1810) (Sauria, Lacertidae) from two mainland regions in the eastern Adriatic area

2013 ◽  
Vol 65 (3) ◽  
pp. 1015-1025
Author(s):  
S.Z. Stamenkovic ◽  
Rada Matic
Keyword(s):  
Resource Availability ◽  
Optimal Foraging ◽  
Morphological Traits ◽  
Prey Size ◽  
Morphological Characteristics ◽  
Optimal Foraging Theory ◽  
Variance Partitioning ◽  
Morphometric Data ◽  
Lizard Species ◽  
Trophic Resource

The correlation between trophic utilization and morphology was studied for two lizard species (Podarcis melisellensis and P. siculus) from two mainland localities in the eastern Adriatic area; this is the first report of trophic and morphometric data for P. melisellensis from mainland populations. Variance partitioning showed that most of the variation in morphological traits for the analyzed lizards was the result of differences between species, and to a lesser extent between sexes. Locality did not have a strong effect on the variation of morphological traits. Prey weight is the only characteristic of prey that generally exhibits correlations with morphological characteristics rather than prey size. The pattern of correlations is generally weaker for P. melisellensis than for P. siculus. Optimal foraging theory predictions were generally confirmed: P. siculus is more constrained by trophic resource availability, with a premium on larger and heavier prey consumed in the less productive locality (SM), which can be relaxed in more productive regions (KL). P. melisellensis shows such constraints only for males in the less productive region (SM). Females of both species consume heavier prey.

Seasonal changes in community composition and trophic structure of fish populations of five salt marshes along the Essex coastline, United Kingdom

2009 ◽  
Vol 85 (2) ◽  
pp. 247-256 ◽  
Author(s):  
Benjamin C. Green ◽  
David J. Smith ◽  
Sarah E. Earley ◽  
Leanne J. Hepburn ◽  
Graham J.C. Underwood
Keyword(s):  
United Kingdom ◽  
Community Composition ◽  
Salt Marshes ◽  
Seasonal Changes ◽  
Trophic Structure ◽  
Fish Populations

scholarly journals Spatio-temporal variation in surf zone fish communities at Ilha do Cardoso State Park, São Paulo, Brazil

2017 ◽  
Vol 41 (2) ◽  
pp. 239-253
Author(s):  
Jana Menegassi del Favero ◽  
June Ferraz Dias
Keyword(s):  
Seasonal Changes ◽  
Fish Community ◽  
Surf Zone ◽  
High Tide ◽  
Fish Communities ◽  
Fish Fauna ◽  
Sao Paulo ◽  
Biological Data ◽  
Seasonal Effect ◽  
São Paulo

In order to analyze the time-space variation of the fish fauna in the surf zone fish communities at Ilha do Cardoso State Park, São Paulo, Brazil, four consecutive hauls were done over a year on three beaches with different degrees of exposure, at low and high tide. To evaluate the influence of each abiotic variable over the fish community, a Canonical Correspondence Analysis was conducted. We identified 7,286 individuals belonging to 20 families and 47 species, most specimens collected were juveniles. At low tide, the highest diversity and richness values were calculated while the highest dominance was obtained at high tide. As for the number of species collected at the three beaches, stood out for the lower values the cooler months, between June and September. Abiotic variables explained 41.3% of the variability of biological data, where 11.4% corresponds to the spatial variation. Meanwhile the temporal variables accounted for 31.9% of the variation in abundance, where 26.3% of the variance explained nycthemeral variation. Additionally two groups were clearly observed between months with low and high temperature. However in this variable, the tidal variation, excluding the seasonal effect, explained 6.2%, while seasonality, excluding tide effect, explained 26.3%. Although the main measurable seasonal changes were related to temperature, water temperature showed a low percentage of explanation in the fish fauna variability (2.7%). Finally, it is emphasized that the seasonal changes in surf zone fish community primarily reflect patterns of recruitment determined by the reproductive activity and coastal circulation.

Seasonal changes in the trophic structure of macroinvertebrates on the cobble substrate

1998 ◽  
Vol 26 (3) ◽  
pp. 1037-1040
Author(s):  
Ivan Habdija ◽  
Ines Radanović ◽  
Biserka Primc-Habdija
Keyword(s):  
Seasonal Changes ◽  
Trophic Structure

scholarly journals Temperate fish community variation over seasons in relation to large-scale geographic seascape variables

2018 ◽  
Vol 75 (10) ◽  
pp. 1723-1732 ◽  
Author(s):  
Diana Perry ◽  
Thomas A.B. Staveley ◽  
Linus Hammar ◽  
Alyssa Meyers ◽  
Regina Lindborg ◽  
...  
Keyword(s):  
Shallow Water ◽  
Deep Water ◽  
Seasonal Changes ◽  
Fish Community ◽  
Large Scale ◽  
Spatial Scales ◽  
Wave Exposure ◽  
Fish Assemblage Structure ◽  
Swedish West Coast ◽  
Latitudinal Position

In shallow-water marine environments, ecosystem functioning is a complex interworking of fine-scale characteristics and region-wide factors, and the importance of these variables can vary on multiple temporal and spatial scales. This underwater video study targeted seasonal changes in the fish community of seagrass habitats along the Swedish west coast and the influence of offshore seascape variables (latitudinal position, wave exposure, open ocean, and deep water). Results showed that fish assemblage structure exhibited seasonal changes between summer and autumn and strong spatiotemporal variations in the importance of offshore factors affecting shallow-water fish communities. In summer, abundance from the Gobiidae family responded to wave exposure, whereas the Gadidae family and juvenile migrant habitat preference guild responded to latitudinal position and proximity to deep water. In autumn, deep water was related to abundance of Gadidae and juvenile migrants, whereas latitudinal position influenced Gasterosteidae. These findings underscore the importance of understanding the influence of offshore factors on facets of coastal fish assemblages to address large-scale geographic connectivity along nearshore–offshore gradients.

Seasonal changes in the guilds of the fish community in Laizhou Bay, China

2014 ◽  
Vol 34 (7) ◽  
Author(s):  
李凡 LI Fan ◽  
徐炳庆 XU Bingqing ◽  
马元庆 MA Yuanqing ◽  
吕振波 LU Zhenbo ◽  
王田田 Wang Tiantian
Keyword(s):  
Seasonal Changes ◽  
Fish Community ◽  
Laizhou Bay

scholarly journals The morphology and biology of Gonatus tinro and Gonatopsis okutanii (Teuthida: Gonatidae) indicate that they are conspecific

2010 ◽  
Vol 67 (7) ◽  
pp. 1464-1477 ◽  
Author(s):  
Oleg N. Katugin ◽  
Gennadyi A. Shevtsov ◽  
Mikhail A. Zuev
Keyword(s):  
Seasonal Changes ◽  
Sea Of Okhotsk ◽  
Adult Stage ◽  
Comparative Morphology ◽  
Morphological Characters ◽  
Northwest Pacific ◽  
Ontogenetic Changes ◽  
Northwest Pacific Ocean ◽  
Wide Range ◽  
Young Stage

Abstract Katugin, O. N., Shevtsov, G. A., and Zuev, M. A. 2010. The morphology and biology of Gonatus tinro and Gonatopsis okutanii (Teuthida: Gonatidae) indicate that they are conspecific. – ICES Journal of Marine Science, 67: 1464–1477. Distribution, size and maturity patterns, and ontogenetic changes in morphological characters of the squid species Gonatus tinro and Gonatopsis okutanii were examined. The database includes information collected during research surveys to the Sea of Okhotsk and the adjacent Northwest Pacific Ocean from 1972 through 2005. Both species are distributed within the same areas beyond the shelf: G. tinro within a wide range of depths and an active vertical migrant, G. okutanii mostly demersal, characteristic of many adult gonatids. Seasonal changes in size and maturity of G. tinro and G. okutanii are congruent in many respects: G. tinro are usually small and young with hookless tentacle clubs, and squid identified as G. okutanii tend to be larger adults with truncated tentacles. The comparative morphology of the two species and the discovery of individuals bearing external features of both indicate that G. okutanii is an adult stage and G. tinro a young stage of the same species. It is concluded that G. okutanii is a junior synonym of G. tinro, which becomes the valid name by precedence.

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