Intertidal habitat: does the shore level affect the nutritional condition of the shanny (Lipophrys pholis, Teleostei, Blenniidae)?

1993 ◽  
Vol 49 (8) ◽  
pp. 725-728 ◽  
Author(s):  
A. Wyttenbach ◽  
D. G. Senn
Keyword(s):  
Nutritional Condition ◽  
Intertidal Habitat ◽  
Shore Level

Diagnosing the nutritional condition of chestnut groves by soil and leaf analyses

2018 ◽  
Vol 228 ◽  
pp. 113-121 ◽  
Author(s):  
Margarida Arrobas ◽  
Sandra Afonso ◽  
M. Ângelo Rodrigues
Keyword(s):  
Nutritional Condition

Design of experimental food patches to measure foraging intensity for octopus: a case study with the giant Pacific octopus Enteroctopus dofleini

2020 ◽  
Author(s):  
Stephanie Chancellor ◽  
David Scheel ◽  
Joel S Brown
Keyword(s):  
Predation Risk ◽  
Foraging Behaviour ◽  
Habitat Preferences ◽  
High Tide ◽  
Intertidal Habitat ◽  
Camera System ◽  
Subtidal Habitat ◽  
Enteroctopus Dofleini ◽  
Nontarget Species

ABSTRACT In a study of the foraging behaviour of the giant Pacific octopus Enteroctopus dofleini, we designed two types of experimental food patches to measure habitat preferences and perceptions of predation risk. The first patch successfully measured giving-up densities (GUDs), confirmed by octopus prey presence and higher foraging at sites with historically greater octopus presence. However, nontarget foragers also foraged on these experimental food patches. Our second floating patch design successfully excluded nontarget species from subtidal patches, and from intertidal patches at high tide, but allowed for foraging by E. dofleini. The second design successfully measured GUDs and suggested that octopus preferred foraging in a subtidal habitat compared to an intertidal habitat. We ascribe the higher GUD in the intertidal habitat to its higher predation risk relative to the subtidal habitat. The second patch design seems well suited for E. dofleini and, in conjunction with a camera system, could be used to provide behavioural indicators of the octopus's abundance, perceptions of habitat quality and predation risk.

Experimental studies of herbivory and algal competition in a low intertidal habitat

Oecologia ◽  
1985 ◽  
Vol 67 (2) ◽  
pp. 183-191 ◽  
Author(s):  
David O. Duggins ◽  
Megan N. Dethier
Keyword(s):  
Experimental Studies ◽  
Intertidal Habitat ◽  
Algal Competition

Influence of environmental conditions on insect reproduction and chemical composition of escamoles (Liometopum apiculatum M)

2016 ◽  
Vol 2 (1) ◽  
pp. 61-65 ◽  
Author(s):  
V. Melo-Ruíz ◽  
K. Sánchez-Herrera ◽  
H. Sandoval-Trujillo ◽  
R. Díaz-García ◽  
T. Quirino-Barreda
Keyword(s):  
Nutritional Value ◽  
Nutritional Condition ◽  
Soluble Carbohydrates ◽  
Soluble Carbohydrate ◽  
Arid Zones ◽  
Good Source ◽  
Rural People ◽  
Abiotic Conditions ◽  
Carbohydrate Levels ◽  
Insect Reproduction

Escamoles, ant eggs (Liometopum apiculatum M), are edible insects consumed in great numbers and appreciated for their sensory characteristics, but not for their nutritional value. In Mexico, they reproduce in arid and semi-arid zones of Mexico and several states (Puebla, Tlaxcala, Hidalgo). Samples were gathered to determine reproduction conditions and perform an insect analysis to generate data composition in macronutrients, on dry basis, according to AOAC methods. The obtained data were: proteins: 42.12-50.63%; lipids: 30.27-34.96%; minerals: 6.53-7.85%; fibres: 1.91-2.56%; and soluble carbohydrates: 6.80-18.27%. Entomological material was collected in spring 2014, 3 nests for each zone, all from different altitudes and agroclimatic regions. Samples were representative for the insect supply in the areas studied. Insects are high in proteins and lipids, compared with most of the commonly consumed food, due to their high content of fatty acids; they must be refrigerated for later consumption. Minerals are moderated. Fibre and soluble carbohydrate levels are low, but an excess of proteins can be converted into carbohydrates via gluconeogenesis. Escamoles reproduce once a year in the spring, but sometimes one nest can provide escamoles eggs twice in the same season, once at the beginning and again at the end, depending on the biotic and abiotic conditions of their environment. Escamoles are a good source of nutrients; however, some rural people sell them to obtain extra income rather than consume them to improve their nutritional condition and welfare.

scholarly journals Casitas: a location-dependent ecological trap for juvenile Caribbean spiny lobsters, Panulirus argus

2015 ◽  
Vol 72 (suppl_1) ◽  
pp. i177-i184 ◽  
Author(s):  
Benjamin C. Gutzler ◽  
Mark J. Butler ◽  
Donald C. Behringer
Keyword(s):  
Florida Keys ◽  
Nutritional Condition ◽  
Ecological Trap ◽  
Habitat Modification ◽  
Panulirus Argus ◽  
Risk Of Predation ◽  
Spiny Lobsters ◽  
Nursery Habitats ◽  
Animal Size ◽  
Fisheries Enhancement

Abstract Casitas are artificial shelters used by fishers to aggregate Caribbean spiny lobsters (Panulirus argus) for ease of capture. However, casitas may function as an ecological trap for juvenile lobsters if they are attracted to casitas and their growth or mortality is poorer compared with natural shelters. We hypothesized that juvenile lobsters may be at particular risk if attracted to casitas because they are less able than larger individuals to defend themselves, and do not forage far from shelter. We compared the nutritional condition, relative mortality, and activity of lobsters of various sizes in casitas and natural shelters in adult and juvenile lobster-dominated habitats in the Florida Keys (United States). We found that the ecological effects of casitas are complex and location-dependent. Lobsters collected from casitas and natural shelters did not differ in nutritional condition. However, juvenile lobsters in casitas experienced higher rates of mortality than did individuals in natural shelters; the mortality of large lobsters did not differ between casitas and natural shelters. Thus, casitas only function as ecological traps when deployed in nursery habitats where juvenile lobsters are lured by conspecifics to casitas where their risk of predation is higher. These results highlight the importance of accounting for animal size and location-dependent effects when considering the consequences of habitat modification for fisheries enhancement.

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