Asaf Sadeh
Asaf_Sadeh.jpg

PhD Student

asaffield@yahoo.com
Phone: NA

I have fledged! PLEASE VISIT MY NEW WEBPAGE.

Research Interests

Temporary pools are habitats with strictly defined borders for their inhabitants, where resources are often limiting, and the duration is unpredictable and potentially short. Many organisms spend part of their life cycle in temporary pools, and have evolved a spectacular array of strategies to cope with their interacting risks, uncertainty and ephemerality. The evolution of these behavioral and life-history strategies is the focus of my PhD research. My main focus is on the fire salamander, Salamandra infraimmaculata, which serves as an excellent model to advance basic evolutionary understanding of organisms utilizing ephemeral habitats.

More specifically, I'm interested in the following aspects of the fire salamanders' strategies:

Larval developmental plasticity, behavior and metamorphic decisions in response to pool desiccation, inter-cohort priority effects of competition and cannibalism.
Complex larviposition habitat selection strategies with respect to dynamic processes occurring within the larval habitats, focusing especially on inter-cohort priority effects among larvae.

To pursue my research goals, I am using a combination of experimental and modeling approaches, along with field observations.

desiccation.jpg
cannibalism.jpg
Risk of desiccation: salamander larvae dried to death on the bottom of a desiccated temporary pool Risk of cannibalism: with the shortage of food characterizing temporary pools, salamander larvae often eat each other. Usually it is the early-deposited cohorts who cannibalize the smaller members of later cohorts

Education

2000/2001: Arava Institute for Environmental Studies, Kibbutz Ketura
2004-2006 B.Sc. in Biology (Ecology)
Dept. of Life Sciences, Ben-Gurion University of the Negev
Senior thesis: 'Plastic bet-hedging in an amphicarpic annual: an integrated strategy under variable conditions'
Conducted at Ofer Ovadia's lab
Summer 2007: Kellogg Biological Station, Michigan State University (ELME program)
Summer 2009: University of California, Santa Cruz (Fulbright research visit to Marc Mangel's lab)

Scholarships, Awards and Grants

ELE_cover.jpg
Sadeh et al (2009)

List of Publications

Saward-Arav, DL., Sadeh, A., Mangel, M., Templeton, A.R., Blaustein. L. 2015. Oviposition responses of two mosquito species to pool size and predator presence: varying trade-offs between desiccation and predation risks? Special issue on predation risk. Israel Journal of Ecology & Evolution (accepted) PDF [* Journal Link]

Sadeh, A. Mangel, M., Polevikove, A., Blaustein, L. Intercohort size structure dynamics of fire salamander larvae in ephemeral habitats: a mesocosm experiment. Oecologia (in press) PDF [* Journal Link]

Blaustein J, Sadeh A, Blaustein L (2014). Influence of fire salamander larvae on among-pool distribution of mosquito egg rafts: Oviposition habitat selection or egg raft predation? Hydrobiologia PDF Journal Link

Blank L, Sinai I, Bar-David S, Peleg N, Segev O, Sadeh A, Kopelman MN, Templeton AR, Merilä J and Blaustein L (2013) Genetic population structure of the endangered fire salamander (Salamandra infraimmaculata) at the southernmost extreme of its distribution. Animal Conservation 16: 412-421 PDF Journal Link

Sadeh A (2012) Kin-selective cannibalism and compensatory performance in larval salamander cohorts inhabiting temporary pools. Evolutionary Ecology Research 14:113-123 PDF Journal Link

Segev O, Mangel M, Wolf N, Sadeh A, Kershenbaum A, Blaustein L (2011) Spatio-temporal reproductive strategies in the fire salamander: a model and empirical test. Behavioral Ecology 22:670–678 PDF Journal Link

Sadeh A, Truskanov N, Mangel M, Blaustein L (2011) Larval responses to desiccated conspecifics: compensatory development and costs of plasticity. PLoS One 6(1). e15602. PDF Journal Link

Sadeh A, Mangel M, Blaustein L (2009) Context-dependent reproductive habitat selection: the interactive roles of structural complexity and cannibalistic conspecifics. Ecology Letters 12:1158-1164 PDF [* Journal Link]

Sadeh A, Guterman H, Gersani M, Ovadia O (2009) Plastic bet-hedging in an amphicarpic annual: an integrated strategy under variable conditions. Evolutionary Ecology 23:373-388 PDF

Conferences

  • Sadeh A, Guterman H (2006) Amphicarpic ratio response in Emex spinosa to intra-specific density and nutrient availability. Annual conference of the Israeli Society of Plant Sciences. Weizmann Institute, Israel (poster).
  • Sadeh A, Guterman H (2007) Plastic bet-hedging in an amphicarpic annual: an integrated strategy under variable conditions. Annual conference of the Israeli Society of Ecology and Environmental Sciences. Weizmann Institute, Israel (poster).
  • Guterman H, Sadeh A (2007) Plastic bet-hedging in an amphicarpic annual: an integrated strategy under variable conditions. Ecological Society of America annual meeting. San Jose, CA (talk).
  • Sadeh A, Segev O, Hill N, Mangel M, Blaustein L (2007) Deposition of larvae by Salamandra salamandra: Managing risks of desiccation and competition. Ecological Society of America annual meeting. San Jose, CA (talk).
  • Bar-David S, Peleg N, Segev O, Hill N, Sadeh A, Templeton AR, Blaustein L (2007) Long-distance movements by fire salamanders: Integration of capture-recapture and genetic data and implications for conservation. Ecological Society of America annual meeting. San Jose, CA (talk).
  • Sadeh A, Mangel M, Blaustein L (2008) Larviposition responses by fire salamanders to structural complexity and risk of cannibalism. British Ecological Society annual meeting. Imperial College, UK (talk).
  • Sadeh A, Mangel M, Blaustein L (2009) Cannibalism, competition and the preference of larviposition habitat structural complexity in the fire salamander. Annual conference of the Israeli Society of Ecology and Environmental Sciences. Weizmann Institute, Israel (talk).
  • Truskanov N, Blaustein L, Sadeh A (2010) Do tadpoles respond to historical death? The effects of desiccation cues on the Fire Salamander's larval development. Annual conference of the Israeli Society of Ecology and Environmental Sciences. Ben-Gurion University, Israel (poster).
  • Sadeh A, Blaustein L, Mangel M (2010) Dynamic Ecology of the larval habitat in oviposition habitat selection theory. Annual conference of the Israeli Society of Ecology and Environmental Sciences. Ben-Gurion University, Israel (talk).
  • Sadeh A, Truskanov N, Mangel M, Blaustein L (2010) Compensatory development and costs of plasticity: larval responses to desiccated conspecifics. Annual conference of the Israel Zoological Society. Hebrew University, Israel (talk).
  • Sadeh A, Polevikov A, Mangel M, Blaustein L (2011) Priority effects as a function of intercohort time interval: aggression and competition in the fire salamander. Annual conference of the Israeli Society of Ecology and Environmental Sciences. Megiddo, Israel (talk).

PhD Dissertation

Sadeh A (2011) Life history strategies of organisms with complex life-cycles and temporary larval habitats: the fire salamander as a model. University of Haifa.

Outreach Publications

Galileo, March 2011. The cost of accelerated development. (In Hebrew, featuring the study published in Sadeh et al. PLoS ONE 2011). PDF

National Geographic: Israel, July 2011. The salamanders' Survivor. (In Hebrew, featuring the study published in Sadeh et al. PLoS ONE 2011). PDF

logo.gif

Community Ecology Lab
Institute of Evolution, Room 240
Dep. of Evolutionary & Environmental Biology
Faculty of Sciences
University of Haifa
Haifa 31905, Israel


Confirm Tag

Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License