Foraging preference of whelks Nucella lapillus is robust to influences of wave exposure and predator cues

2015 ◽  
Vol 540 ◽  
pp. 135-144 ◽  
Author(s):  
EM Dernbach ◽  
AS Freeman
Keyword(s):  
Wave Exposure ◽  
Nucella Lapillus ◽  
Predator Cues ◽  
Foraging Preference

Predator chemical cues affect prey feeding activity differently in juveniles and adults

2012 ◽  
Vol 90 (1) ◽  
pp. 128-132 ◽  
Author(s):  
Bradley R. Johnston ◽  
Markus Molis ◽  
Ricardo A. Scrosati
Keyword(s):  
Life History ◽  
Chemical Cues ◽  
Prey Species ◽  
Feeding Activity ◽  
Life History Stage ◽  
Ontogenetic Changes ◽  
Nucella Lapillus ◽  
Nonconsumptive Effects ◽  
Predator Cues ◽  
Predator Effects

Nonconsumptive predator effects on prey behaviour are common in nature, but the possible influence of prey life-history stage on such responses is poorly known. We investigated whether prey life-history stage may be a factor affecting prey feeding activity responses to predator chemical cues, for which we used dogwhelks ( Nucella lapillus (L., 1758)) and their main prey, barnacles ( Semibalanus balanoides (L., 1758)), as a model system. Barnacles use their modified legs (cirri) to filter food from the water column. Through a manipulative laboratory experiment, we tested the hypothesis that the presence of dogwhelks affects the frequency of leg swipes differently in juvenile and adult barnacles. Juveniles showed a similar feeding activity with and without nearby dogwhelks, but adults exhibited a significantly lower frequency of leg swipes when dogwhelks were present. Such an ontogenetic change in the response of barnacles to predatory cues might have evolved as a result of dogwhelks preferring adult barnacles over juvenile barnacles, as found previously. Alternatively, barnacles could learn to recognize predator cues as they age, as shown for other prey species. Overall, our study indicates that the nonconsumptive effects of predators on prey need to be fully understood under consideration of the possible ontogenetic changes in prey responses to predator cues.

Wave exposure as a driver of isolation by environment in the marine gastropod Nucella lapillus

Hydrobiologia ◽  
2019 ◽  
Vol 839 (1) ◽  
pp. 51-69
Author(s):  
Belén Carro ◽  
María Quintela ◽  
José Miguel Ruiz ◽  
Rodolfo Barreiro
Keyword(s):  
Wave Exposure ◽  
Nucella Lapillus ◽  
Marine Gastropod ◽  
Isolation By Environment

Seaweed traits linked to wave exposure determine predator avoidance

2013 ◽  
Vol 483 ◽  
pp. 143-151 ◽  
Author(s):  
JD Long ◽  
L Porturas ◽  
E Jones ◽  
C Kwan ◽  
GC Trussell
Keyword(s):  
Predator Avoidance ◽  
Wave Exposure

Pengaruh Variasi Waktu Paparan Gelombang Ultrasonik dalam Mengurangi Jumlah Bakteri coliform pada Sampel Air Sungai Kahayan

2020 ◽  
Vol 4 (1) ◽  
pp. 9-13 ◽  
Author(s):  
Neny Kurniawati, Kerelius, Sunariyati ◽  
Luqman Hakim, Dyah Ayu Pramoda Wardani, Widya Krestina ◽  
Dwi Tyas Setiawan, Ferry Purwanto, Diah K. Fatmala
Keyword(s):  
Water Treatment ◽  
River Water ◽  
Ultrasonic Wave ◽  
Exposure Time ◽  
Water Samples ◽  
Sampling Technique ◽  
Wave Exposure ◽  
Test Results ◽  
Time Data ◽  
Grab Sampling

Abstrak – Penelitian ini bertujuan untuk mengkaji pengaruh waktu paparan gelombang ultrasonik terhadap pengurangan jumlah koloni bakteri coliform pada sampel air sungai Kahayan. Pengambilan sampel air sungai dilakukan dengan teknik Grab Sampling menggunakan alat Kemmerer Sampler. Sampel air yang didapatkan diberikan paparan gelombang ultrasonik secara langsung, tanpa merubah kondisi lingkungan awal. Waktu paparan divariasikan pada 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam dengan frekuensi 40 kHz untuk memperoleh data waktu optimum. Uji coliform dilakukan dengan metode MPN, dengan tahapan uji pendugaan, uji penegasan, dan perhitungan koloni. Hasil uji MPN 24 jam setelah paparan menunjukkan bahwa penggunaan ultrasonik sebagai antibateri dapat optimum ketika diberikan paparan dengan waktu 3 jam, dengan efisiensi  96%. Kata kunci: antibakteri, coliform, ultrasonik, water treatment, sungai Kahayan  Abstract – This study aims to examine the effect of ultrasonic wave exposure time on reducing the number of coliform bacterial colonies in the Kahayan river water samples. River water sampling is done using the Grab Sampling technique using the Kemmerer Sampler tool. The water samples obtained were given direct ultrasonic wave exposure, without changing the initial environmental conditions. The exposure time is varied in 1 hour, 2 hours, 3 hours, 4 hours and 5 hours with a frequency of 40 kHz to obtain optimum time data. Coliform test was carried out by the MPN method, with the stages of the estimation test, affirmation test, and colony calculation. The MPN test results 24 hours after exposure showed that the use of ultrasonic as an antibody can be optimum when given exposure with a time of 3 hours, with an efficiency of 96%.Keywords : antibakterial, coliform, ultrasonic, water treatment, Kahayan river

scholarly journals Pollen Source Affects Development and Behavioral Preferences in Honey Bees

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 130
Author(s):  
Jun Lan ◽  
Guiling Ding ◽  
Weihua Ma ◽  
Yusuo Jiang ◽  
Jiaxing Huang
Keyword(s):  
Honey Bees ◽  
Nutritional Value ◽  
Choice Test ◽  
Physiological Status ◽  
Significant Preference ◽  
Hypopharyngeal Glands ◽  
Pollen Types ◽  
Behavioral Preferences ◽  
Foraging Preference ◽  
Pollen Consumption

With the availability of various plants in bloom simultaneously, honey bees prefer to collect some pollen types over others. To better understand pollen’s role as a reward for workers, we compared the digestibility and nutritional value of two pollen diets, namely, pear (Pyrus bretschneideri Rehd.) and apricot (Armeniaca sibirica L.). We investigated the visits, pollen consumption, and pollen extraction efficiency of caged Apis mellifera workers. Newly emerged workers were reared, and the effects of two pollen diets on their physiological status (the development of hypopharyngeal glands and ovaries) were compared. The choice-test experiments indicated a significant preference of A. mellifera workers for apricot pollen diets over pear pollen diets (number of bees landing, 29.5 ± 8.11 and 9.25 ± 5.10, p < 0.001 and pollen consumption, 0.052 ± 0.026 g/day and 0.033 ± 0.013 g/day, p < 0.05). Both pollen diets had comparable extraction efficiencies (67.63% for pear pollen and 67.73% for apricot pollen). Caged workers fed different pollen diets also exhibited similar ovarian development (p > 0.05). However, workers fed apricot pollen had significantly larger hypopharyngeal glands than those fed pear pollen (p < 0.001). Our results indicated that the benefits conferred to honey bees by different pollen diets may influence their foraging preference.

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