scholarly journals Foraging strategies of Adélie penguins: adjusting body condition to cope with environmental variability

2010 ◽  
Vol 405 ◽  
pp. 287-302 ◽  
Author(s):  
G Ballard ◽  
KM Dugger ◽  
N Nur ◽  
DG Ainley
Keyword(s):  
Body Condition ◽  
Environmental Variability ◽  
Foraging Strategies ◽  
Adélie Penguins

Foraging strategies of male Adélie penguins during their first incubation trip in relation to environmental conditions

2012 ◽  
Vol 159 (8) ◽  
pp. 1843-1852 ◽  
Author(s):  
Manuelle Cottin ◽  
Ben Raymond ◽  
Akiko Kato ◽  
Françoise Amélineau ◽  
Yvon Le Maho ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Foraging Strategies ◽  
Adélie Penguins

scholarly journals Trace metal concentrations and body condition in adult Adélie penguins (Pygoscelis adeliae) from the western Antarctic Peninsula

2020 ◽  
Vol 48 (5) ◽  
pp. 886-894
Author(s):  
Winfred Espejo ◽  
Bernardo Ferreira Braz ◽  
Ricardo Santelli ◽  
Janeide de A. Padilha ◽  
Paulo Dorneles ◽  
...  
Keyword(s):  
Trace Metal ◽  
Body Condition ◽  
South Shetland Islands ◽  
Morphological Parameters ◽  
Pygoscelis Adeliae ◽  
Shetland Islands ◽  
Metal Levels ◽  
Specific Factors ◽  
The Relationship ◽  
Adélie Penguins

Adélie penguins (Pygoscelis adeliae) are seabirds that live exclusively in Antarctica, one of the planet's last pristine areas. However, this remote region is experiencing a continuing expansion of human activities that may affect Antarctic fauna. Trace metals constitute a menace to seabirds because they can adversely affect their health. There is a lack of studies relating to metals' levels in feathers with morphological parameters of seabirds. Trace metal levels were measured in Adélie penguin feathers and their body condition through the relative condition factor (ReCF) in adult individuals from two South Shetland Islands locations and two from Graham Land. Consequently, we determined the levels of some metals in feathers to see any relationship with morphological parameters linked to the bird's health. Our results showed significant differences in metals among locations studied and a significant relationship between ReCF with Cu and Zn in one of the South Shetland Islands. Also, penguins exhibited a significantly lower weight. We found a positive correlation between non-essential with essential metals, indicating that Cu acts as a detoxifying agent for Cr, Cd, and Pb. In contrast, Se could be for V and Pb. Although the relationship between most metals with ReCF was not significant, some site-specific factors may be influencing it, whereas metals may be affecting the organisms at low biological levels. Molecular, biochemical, and genetic studies are required to elucidate this issue.

scholarly journals Influence of environmental variability on the body condition of the mangrove horseshoe crab Carcinoscorpius rotundicauda from Banyuasin Estuarine, South Sumatra, Indonesia

2020 ◽  
Vol 30 ◽  
pp. 37-46
Author(s):  
Nita P. Sari ◽  
Noviantrio Gulo ◽  
Miftahun Najah ◽  
Fauziyah .
Keyword(s):  
Body Condition ◽  
Horseshoe Crab ◽  
Environmental Variability ◽  
Sampling Site ◽  
Environmental Parameters ◽  
Well Being ◽  
Management Plan ◽  
Marine Conservation ◽  
The Body ◽  
Condition Indices

The body conditions indices were useful to determine an individual's well-being, and favorable food availability indicating a good environmental condition. The conditions of the mangrove horseshoe crab (Carcinoscorpius rotundicauda) might be related to several environmental parameters. The study's aim was to analyze the key environmental parameters affecting the body condition of C. rotundicauda found in Banyuasin Estuary Waters. The sampling was conducted in July 2019 in Banyuasin Estuary Waters.  The data of weight and prosomal width for C. rotundicauda were used to estimate the body conditions indices (relative condition factor). While the environmental parameters data were recorded for each sampling site. The backward stepwise regression was used to determine the key environmental parameters affecting the body condition indices. The best-fitted model (adjusted R2 = 91.9%; F = 60.102; p < 0.05) indicated several environmental parameters (salinity, pH, seafloor temperature, clay and silt contents) significantly affecting the body condition indices. Changes in the key environmental parameters could generate changes in the availability of favorable food for C. rotundicauda. The result also can be used as baseline data for determining the marine conservation areas as well as horseshoe crab management plan.

scholarly journals Influence of environmental variability and age on the body condition of small pelagic fish in the Gulf of Lions

2015 ◽  
Vol 529 ◽  
pp. 219-231 ◽  
Author(s):  
P Brosset ◽  
F Ménard ◽  
JM Fromentin ◽  
S Bonhommeau ◽  
C Ulses ◽  
...  
Keyword(s):  
Body Condition ◽  
Environmental Variability ◽  
Pelagic Fish ◽  
The Body ◽  
Small Pelagic Fish ◽  
Gulf Of Lions

scholarly journals Parental Provisioning Patterns of Wedge-Tailed Shearwaters and their Relation to Chick Body Condition

The Condor ◽  
2002 ◽  
Vol 104 (4) ◽  
pp. 823-831 ◽  
Author(s):  
Cheryl L. Baduini
Keyword(s):  
Body Condition ◽  
Foraging Strategy ◽  
Food Delivery ◽  
Foraging Strategies ◽  
Trip Length ◽  
Prey Resources ◽  
Parental Provisioning ◽  
Puffinus Pacificus ◽  
Foraging Environment ◽  
To Receive

Abstract I studied the provisioning patterns of a subtropical, northern-hemisphere procellariiform, the Wedge-tailed Shearwater (Puffinus pacificus) and measured the responses of parents to chick body condition. Foraging trip length, meal size, delivery rate, and chick body condition were measured during nesting periods in 1996 and 1997. Wedge-tailed Shearwaters adopted a unimodal foraging strategy with foraging trips that averaged 1.5 to 2 days duration and averaged about 40–50 g of food per trip. The rate of food delivery (g of food per day spent foraging) decreased with increasing trip duration, such that one-day trips resulted in the greatest rate of food delivery to the nest in both 1996 and 1997. Chicks left in poorer body condition were more likely to receive visits from one or both adults the following evening (1996 and 1997) and received larger meals (1996) than those left in better condition. Although foraging strategies may differ from subpolar and temperate shearwater species, rates of food delivery to chicks (40–60 g per day) for Wedge-tailed Shearwaters were similar to these species, which feed in highly productive areas and employ bimodal (short and long) foraging trips. The distribution and abundance of prey resources in the foraging environment of procellariiform seabirds may influence foraging strategies of parents, the timing and amount they feed offspring, and the duration of parental care. Patrones de Aprovisionamiento Parental de Puffinus pacificus y Su Relación con la Condición Corporal del Polluelo Resumen. Estudié los patrones de aprovisionamiento de Puffinus pacificus, un procelariforme subtropical del hemisferio norte, y medí las respuestas de los padres a la condición corporal del polluelo. Durante los períodos de nidificación de 1996 y 1997 se midió la longitud del viaje de forrajeo, la cantidad de comida provista a los polluelos, la tasa de entrega de comida y la condición corporal del polluelo. Puffinus pacificus adoptó una estrategia unimodal de forrajeo, con viajes de forrajeo que promediaron entre 1.5 y 2 días de duración, y entre 40 y 50 g de comida por viaje. La tasa de entrega de alimento (g de alimento por día de forrajeo) disminuyó con el aumento de la duración del viaje, tal que los viajes de un día resultaron en la tasa más alta de entrega de alimento al nido, tanto en 1996 como en 1997. Los polluelos con condición corporal más pobre tuvieron mayor probabilidad de ser visitados por uno o ambos padres durante la tarde siguiente (1996 y 1997) y de recibir más cantidad de comida (1996) que aquellos dejados en mejores condiciones. Aunque las estrategias de forrajeo de las especies de Puffinus subpolares y templadas pueden diferir, las tasas de entrega de alimento (40–60 g por día) a los polluelos de Puffinus pacificus fueron similares a las de estas especies, las cuales se alimentan en áreas altamente productivas y emplean estrategias de forrajeo bimodales (viajes cortos y largos). La distribución y abundancia de las presas en el área de forrajeo de los procelariformes pueden influenciar las estrategias de forrajeo de los padres, el momento y la cantidad con que alimentan a los pichones, y la duración del cuidado parental.

Effect of environmental variability on body condition and recruitment success of Atlantic Mackerel (Scomber scombrusL.) in the Gulf of St. Lawrence

2015 ◽  
Vol 24 (4) ◽  
pp. 347-363 ◽  
Author(s):  
Stéphane Plourde ◽  
François Grégoire ◽  
Caroline Lehoux ◽  
Peter S. Galbraith ◽  
Martin Castonguay ◽  
...  
Keyword(s):  
Body Condition ◽  
Environmental Variability ◽  
Atlantic Mackerel ◽  
Recruitment Success

scholarly journals The cost of a meal: factors influencing prey profitability in Australian fur seals

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12608
Author(s):  
Nelle Meyers ◽  
Cassie N. Speakman ◽  
Nicole A.S.-Y. Dorville ◽  
Mark A. Hindell ◽  
Jayson M. Semmens ◽  
...  
Keyword(s):  
Environmental Variability ◽  
Prey Type ◽  
Video Data ◽  
Foraging Strategies ◽  
Costs And Benefits ◽  
Fur Seals ◽  
Data Loggers ◽  
Eastern Australia ◽  
Survival And Reproduction ◽  
Gross Energy

Knowledge of the factors shaping the foraging behaviour of species is central to understanding their ecosystem role and predicting their response to environmental variability. To maximise survival and reproduction, foraging strategies must balance the costs and benefits related to energy needed to pursue, manipulate, and consume prey with the nutritional reward obtained. While such information is vital for understanding how changes in prey assemblages may affect predators, determining these components is inherently difficult in cryptic predators. The present study used animal-borne video data loggers to investigate the costs and benefits related to different prey types for female Australian fur seals (Arctocephalus pusillus doriferus), a primarily benthic foraging species in the low productivity Bass Strait, south-eastern Australia. A total of 1,263 prey captures, resulting from 2,027 prey detections, were observed in 84.5 h of video recordings from 23 individuals. Substantial differences in prey pursuit and handling times, gross energy gain and total energy expenditure were observed between prey types. Importantly, the profitability of prey was not significantly different between prey types, with the exception of elasmobranchs. This study highlights the benefit of animal-borne video data loggers for understanding the factors that influence foraging decisions in predators. Further studies incorporating search times for different prey types would further elucidate how profitability differs with prey type.

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