Diet compositions and trophic guild structure of the eastern Chukchi Sea demersal fish community

Natural gradient systems can be used to examine the vulnerability of deep-sea communities to climate change. The Gulf of California presents an ideal system for examining relationships between faunal patterns and environmental conditions of deep-sea communities because deep-sea conditions change from warm and oxygen-rich in the north to cold and severely hypoxic in the south. The Monterey Bay Aquarium Research Institute (MBARI) remotely operated vehicle (ROV) ‘Doc Ricketts’ was used to conduct seafloor video transects at depths of ~200-1400 m in the northern, central, and southern Gulf. The community composition, density, and diversity of demersal fish assemblages were compared to environmental conditions. We tested the hypothesis that climate-relevant variables (temperature, oxygen, and primary production) have more explanatory power than static variables (latitude, depth, and benthic substrate) in explaining variation in fish community structure. Temperature best explained variance in density, while oxygen best explained variance in diversity and community composition. Both density and diversity declined with decreasing oxygen, but diversity declined at a higher oxygen threshold (~7 µmol kg-1). Remarkably, high-density fish communities were observed living under suboxic conditions (<5 µmol kg-1). Using an Earth systems global climate model forced under an RCP8.5 scenario, we found that by 2081-2100, the entire Gulf of California seafloor is expected to experience a mean temperature increase of 1.08 ± 1.07°C and modest deoxygenation. The projected changes in temperature and oxygen are expected to be accompanied by reduced diversity and related changes in deep-sea demersal fish communities.

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Structure of three subtropical bat assemblages (Chiroptera) in the Andean rainforests of Argentina

Mammalia ◽

10.1515/mammalia-2014-0084 ◽

2016 ◽

Vol 80 (1) ◽

Author(s):

Mariano S. Sánchez

Keyword(s):

Species Richness ◽

Relative Abundance ◽

Seasonal Changes ◽

Common Species ◽

Guild Structure ◽

Trophic Guild ◽

Long Tail ◽

Mist Net ◽

Yungas Forests

AbstractI evaluated bat assemblages in terms of species richness, relative abundance, trophic guild structure, and seasonal changes at three sites along of the Southern Yungas forests. A total of 854 individuals were captured, representing 25 species of three families, with an effort of 27,138 m of mist net opened per hour. Subtropical assemblages showed a similar structure to those from tropical landmark, with a dominance of frugivorous Phyllostomid; in addition, a few species were abundant, followed by a long tail of less common species. However, subtropical sites differed due to the dominance of the genus

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Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community

ICES Journal of Marine Science ◽

10.1093/icesjms/fsr188 ◽

2012 ◽

Vol 69 (1) ◽

pp. 8-22 ◽

Cited By ~ 18

Author(s):

Simon P. R. Greenstreet ◽

Helen M. Fraser ◽

Stuart I. Rogers ◽

Verena M. Trenkel ◽

Stephen D. Simpson ◽

...

Keyword(s):

North Sea ◽

Fish Community ◽

Size Structure ◽

Demersal Fish ◽

Community Size ◽

The North ◽

Management Objectives ◽

The North Sea ◽

Composition Structure ◽

And Function

Abstract Greenstreet, S. P. R., Fraser, H. M., Rogers, S. I., Trenkel, V. M., Simpson, S. D., and Pinnegar, J. K. 2012. Redundancy in metrics describing the composition, structure, and functioning of the North Sea demersal fish community. – ICES Journal of Marine Science, 69: 8–22. Broader ecosystem management objectives for North Sea demersal fish currently focus on restoring community size structure. However, most policy drivers explicitly concentrate on restoring and conserving biodiversity, and it has not yet been established that simply restoring demersal fish size composition will be sufficient to reverse declines in biodiversity and ensure a generally healthy community. If different aspects of community composition, structure, and function vary independently, then to monitor all aspects of community general health will require application of a suite of metrics. This assumes low redundancy among the metrics used in any such suite and implies that addressing biodiversity issues specifically will require explicit management objectives for particular biodiversity metrics. This issue of metric redundancy is addressed, and 15 metrics covering five main attributes of community composition, structure, and function are applied to groundfish survey data. Factor analysis suggested a new interpretation of the metric information and indicated that a minimum suite of seven metrics was necessary to ensure that all changes in the general health of the North Sea demersal fish community were monitored properly. Covariance among size-based and species-diversity metrics was low, implying that restoration of community size structure would not necessarily reverse declines in species diversity.

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Preliminary assessment of the trophic structure of demersal fish community in the Sea of Oman

Regional Studies in Marine Science ◽

10.1016/j.rsma.2017.08.008 ◽

2017 ◽

Vol 16 ◽

pp. 145-151

Author(s):

L. Carassou ◽

A.S. Al-Kindi ◽

S. Dobrestsov

Keyword(s):

Fish Community ◽

Trophic Structure ◽

Demersal Fish ◽

Preliminary Assessment ◽

Sea Of Oman

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Demersal fish community on the inner shelf of Ubatuba, southeastern Brazil

Revista Brasileira de Oceanografia ◽

10.1590/s1413-77391998000200001 ◽

1998 ◽

Vol 46 (2) ◽

pp. 93-109 ◽

Cited By ~ 24

Author(s):

Gecely R. A. Rocha ◽

Carmen L. D. B. Rossi-Wongtschowski

Keyword(s):

Continental Shelf ◽

Coastal Water ◽

Fish Community ◽

Species Abundance ◽

Fish Fauna ◽

Sampling Period ◽

Demersal Fish ◽

Southeastern Brazil ◽

Otter Trawl ◽

South Atlantic Central Water

Fluctuations in the distribution and abundance of demersal fishes collected by otter trawl on the continental shelf of Ubatuba were examined over a two-year sampling period, in an area up to 50 m depth. A total of 111 species were collected. Seasonal and annual fluctuations in species abundance were related to differences in the distribution of Coastal Water and South Atlantic Central Water masses. The demersal fish fauna in the area was divided into three ecologically distinct communities: Tropical Sciaenid, Subtropical Sciaenid, and Gerreid-Haemulid. The most important one is the Tropical Sciaenid Community, characterized by Ctenosciaena gracilicirrhus, Paralonchurus brasiliensis, and Cynoscion jamaicensis.

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Synchrony patterns reveal different degrees of trophic guild vulnerability after disturbances in a coral reef fish community

Diversity and Distributions ◽

10.1111/ddi.12931 ◽

2019 ◽

Cited By ~ 3

Author(s):

Jérémie Viviani ◽

Charlotte Moritz ◽

Valeriano Parravicini ◽

David Lecchini ◽

Gilles Siu ◽

...

Keyword(s):

Coral Reef ◽

Reef Fish ◽

Coral Reef Fish ◽

Fish Community ◽

Trophic Guild ◽

Reef Fish Community

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Ekologi Trofik Komunitas Ikan di Perairan Segara Menyan, Subang, Jawa Barat (Trophic Ecology of the Fish Community in Segara Menyan Coastal Lagoon, Subang, West Java)

ILMU KELAUTAN Indonesian Journal of Marine Sciences ◽

10.14710/ik.ijms.20.3.170-186 ◽

2015 ◽

Vol 20 (3) ◽

pp. 170 ◽

Cited By ~ 1

Author(s):

Ahmad Zahid ◽

M.F. Rahardjo ◽

Lenny S Syafei ◽

Rini Susilowati

Keyword(s):

Temporal Variation ◽

Fish Species ◽

Trophic Level ◽

Coastal Lagoon ◽

Fish Community ◽

Trophic Ecology ◽

Diet Breadth ◽

Gut Contents ◽

Trophic Guild ◽

Spatio Temporal

Pengetahuan mengenai ekologi trofik merupakan dasar dalam memahami ekosistem secara keseluruhan yang dapat dijelaskan melalui pola hubungan trofik interspesies ataupun interserikat. Penelitian bertujuan untuk menjelaskan ekologi trofik meliputi indeks trofik dan jenis makanan dominan, serikat dan tingkat trofik, dan variasi spasial dan temporal komunitas ikan di estuari Segara Menyan. Pengambilan ikan contoh dilakukan setiap bulan pada zona berbeda. Ikan contoh dipisahkan berdasarkan waktu dan lokasi pengamatan, dianalisis isi saluran pencernaannya. Analisa data meliputi indeks vakuitas, jumlah total organisme makanan, jenis makanan dominan, luas relung makanan, dan tingkat trofik. Pada pengamatan 106 spesies ikan, sebanyak 1-380 saluran pencernaan ikan diamati. Sebanyak lima dari 106 spesies memiliki nilai indeks vakuitas “0” dan jumlah makanan yang dikonsumsi bervariasi mulai dari empat hingga 27 jenis makanan. Secara umum, luas relung ikan adalah rendah berkisar 0,20-0,78 dan kebanyakan berada pada kisaran 0,20-0,48. Zooplankton merupakan jenis makanan paling dominan dikonsumsi oleh ikan. Komunitas ikan dikelompokkan dalam tujuh serikat trofik, yaitu detritivora, fitoplanktivora, zooplanktivora, zoobentivora, moluskivora, krustasivora, dan pisivora. Tingkat trofik komunitas ikan berkisar 2,05-4,73. Faktor perubahan ontogenetik, persediaan makanan, karakteristik habitat, dan ruaya beberapa spesies ikan memengaruhi variasi spasio-temporal jejaring makanan di Segara Menyan. Kata kunci: interaksi trofik, laguna, ikan, variasi spasio-temporal, serikat trofik Knowledge of trophic ecology is one way to understanding the whole ecosystem which explained by trophic relationship pattern (interspecies or interguild). The objective research was described of the trophic ecology, i.e. trophic index and dominant prey, trophic guild and trophic level, and spatio-temporal variation of fish community in Segara Menyan coastal lagoon. Fish were collected monthly for one year at three zones. Fish samples were placed in separate labelled plastic bags according to the time scale and location sampling, then gut contents were analyzed. The data of vacuity index, number of prey, prey dominant, diet breadth, and trophic level were analyzed. For each of 106 fish species, between 1 and 380 stomachs, were examined. The vacuity index was also different among species. Five of 106 species had a vacuity index of “0” and total number of food items consumed varied between fish species, ranging from three items to 27 items. The overall diet breadth (Bi) was relatively low among species, ranging from 0.20 to 0.78, with most of them between 0.20 and 0.48. Calanoid copepods comprised the most common food item consumed by all the fishes examined. Fishes occurring can be broadly categorized into seven different trophic guilds. The trophic level of fish communities ranged from 2.05 to 4.73. Spatio-temporal variation of food web was influenced of ontogenetic shift, food availability, habitat characteristic, and migration of some species in Segara Menyan coastal lagoon. Keywords: trophic interaction, lagoon, fishes, spatio-temporal variation, trophic guild

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