scholarly journals Trophic niche differences between two congeneric goby species: evidence for ontogenetic diet shift and habitat use

2014 ◽  
Vol 20 (1) ◽  
pp. 23-33 ◽  
Author(s):  
Z Guo ◽  
J Liu ◽  
S Lek ◽  
Z Li ◽  
F Zhu ◽  
...  
Keyword(s):  
Habitat Use ◽  
Trophic Niche ◽  
Diet Shift ◽  
Ontogenetic Diet Shift ◽  
Niche Differences ◽  
Goby Species

scholarly journals Seasonal feeding habits and ontogenetic diet shift of black bullhead (Ameiurus melas) in Lake Sava (Serbia)

2021 ◽  
pp. 45-45
Author(s):  
Milica Jacimovic ◽  
Jasmina Krpo-Cetkovic ◽  
Stefan Skoric ◽  
Marija Smederevac-Lalic ◽  
Aleksandar Hegedis
Keyword(s):  
Niche Breadth ◽  
Negative Impact ◽  
Feeding Habits ◽  
Fish Fauna ◽  
Trophic Niche ◽  
Diet Analysis ◽  
Diet Shift ◽  
Trophic Diversity ◽  
Black Bullhead ◽  
Ontogenetic Diet Shift

The black bullhead is an invasive species that forms dense populations and has a negative impact on the native ichthyofauna. Recent studies indicate that it is one of the most dominant invasive fish species in Serbian waters. Feeding habits based on stomach contents of individuals caught in Lake Sava were analyzed as a first step towards evaluating its possible negative impact on the native fish fauna of the lake. The following indices for diet analysis were applied: vacuity index, frequency of occurrence, numerical abundance and prominence value. Trophic niche breadth and seasonal trophic diversity were calculated using the Shannon?s index. The diet spectrum comprised 16 different prey categories from five groups: Mollusca, Crustacea, Insecta, Teleostei and plants. Fish were the main prey in all seasons, followed by aquatic invertebrates. Plant material and terrestrial insects were used as food in relatively small quantities. Predation on fish eggs was also detected. Our research confirmed that this species is an opportunistic generalist. An ontogenetic diet shift was also detected. The lowest value of trophic diversity was found in age 1+ individuals (H=1.39), while the highest was found in age 3+ individuals (H=2.00). The widest niche breadth was recorded in spring 2011 (H=2.12).

Interactions between habitat use, behavior, and the trophic niche of lacertid lizards

2010 ◽  
pp. 427-449 ◽  
Author(s):  
Bieke Vanhooydonck ◽  
Anthony Herrel ◽  
Raoul Van Damme
Keyword(s):  
Habitat Use ◽  
Trophic Niche ◽  
Lacertid Lizards ◽  
Use Behavior

scholarly journals Onychophorology, the study of velvet worms, historical trends, landmarks, and researchers from 1826 to 2020 (a literature review)

Uniciencia ◽  
2021 ◽  
Vol 35 (1) ◽  
pp. 210-230
Author(s):  
Julián Monge-Nájera
Keyword(s):  
Costa Rica ◽  
Conservation Status ◽  
Diet Shift ◽  
Mass Extinctions ◽  
Half Century ◽  
Ontogenetic Diet Shift ◽  
Velvet Worms ◽  
History Of ◽  
Experimental Taphonomy ◽  
New Research

Velvet worms, also known as peripatus or onychophorans, are a phylum of evolutionary importance that has survived all mass extinctions since the Cambrian period. They capture prey with an adhesive net that is formed in a fraction of a second. The first naturalist to formally describe them was Lansdown Guilding (1797-1831), a British priest from the Caribbean island of Saint Vincent. His life is as little known as the history of the field he initiated, Onychophorology. This is the first general history of Onychophorology, which has been divided into half-century periods. The beginning, 1826-1879, was characterized by studies from former students of famous naturalists like Cuvier and von Baer. This generation included Milne-Edwards and Blanchard, and studies were done mostly in France, Britain, and Germany. In the 1880-1929 period, research was concentrated on anatomy, behavior, biogeography, and ecology; and it is in this period when Bouvier published his mammoth monograph. The next half-century, 1930-1979, was important for the discovery of Cambrian species; Vachon’s explanation of how ancient distribution defined the existence of two families; DNA and electron microscopy from Brazil; and primitive attempts at systematics using embryology or isolated anatomical characteristics. Finally, the 1980-2020 period, with research centered in Australia, Brazil, Costa Rica, and Germany, is marked by an evolutionary approach: from body and behavior to geographic distribution; the discovery of how they form their adhesive net; the reconstruction of Cambrian onychophoran communities, the first experimental taphonomy; the first country-wide map of conservation status (in Costa Rica); the first model of why they survive in cities; the discovery of new phenomena like food hiding, parental feeding investment, and ontogenetic diet shift; and the birth of a new research branch, onychophoran ethnobiology. While a few names often appear in the literature, most knowledge was produced by a mass of researchers who entered the field only briefly.

scholarly journals Individual niche trajectories in nesting green turtles on Rocas Atoll, Brazil: an isotopic tool to assess diet shifts over time

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Karoline Fernanda Ferreira Agostinho ◽  
Leandro Rabello Monteiro ◽  
Ana Paula Madeira Di Beneditto
Keyword(s):  
Trophic Ecology ◽  
Isotope Analysis ◽  
Trophic Niche ◽  
Northeastern Brazil ◽  
Diet Shift ◽  
Isotopic Niche ◽  
Temporal Window ◽  
Temporal Dimension ◽  
Green Turtles ◽  
Diet Shifts

Abstract In this study, multi-tissue (yolk and carapace) stable isotope analysis was used to assess individual isotopic niche trajectories of nesting green turtles on Rocas Atoll, off northeastern Brazil, and to reveal a diet shift in the temporal dimension. The diet trajectories of individual green turtles were highly directional, with a stronger component towards decreasing values of δ15N from carapace to yolk. When the green turtles are in their foraging sites (temporal window measured by the yolk samples), they are more herbivores. Conversely, in a broader temporal window, the green turtles demonstrate a carnivore-omnivore strategy, such as represented by heavier δ15N values in the carapace. This finding confirms a temporal diet shift. This is the first study that applies trophic niche trajectories for sea turtles, adding a new isotopic tool to understand the trophic ecology of these migrant animals.

scholarly journals Feeding behavior of Costa Rican velvet worms: food hiding, parental feeding investment and ontogenetic diet shift (Onychophora: Peripatidae)

2019 ◽  
Vol 11 (2) ◽  
pp. 85-88
Author(s):  
José Pablo Barquero González ◽  
Alvaro Vega-Hidalgo ◽  
Julián Monge-Nájera
Keyword(s):  
Feeding Behavior ◽  
Costa Rican ◽  
Diet Shift ◽  
Ontogenetic Diet Shift ◽  
Parental Feeding ◽  
Velvet Worms ◽  
First Time

We report, for the first time in onychophorans, food hiding, parental feeding investment and an ontogenetic diet shift two weeks after birth: from the parent’s adhesive used to capture prey, to the prey itself. 

Prey preferences and ontogenetic diet shift of European hake Merluccius merluccius (Linnaeus, 1758) in the central Mediterranean Sea

2019 ◽  
Vol 25 ◽  
pp. 100440 ◽  
Author(s):  
Virginia Carrozzi ◽  
Manfredi Di Lorenzo ◽  
Daniela Massi ◽  
Antonino Titone ◽  
Giandomenico Ardizzone ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Diet Shift ◽  
Central Mediterranean ◽  
Merluccius Merluccius ◽  
Ontogenetic Diet Shift ◽  
Prey Preferences ◽  
Central Mediterranean Sea ◽  
European Hake
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