Evidence map›Paper›PMID 39711313›Full record

ReviewBiological reviews of the Cambridge Philosophical Society2025

Optimism and pessimism: a concept for behavioural ecology.

Viktoria Siewert, Sylvia Kaiser, Norbert Sachser, S Helene Richter

Abstract readReview
In one paragraph

Review in Biological reviews of the Cambridge Philosophical Society, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.

0numbers the graph read from it
0cells of the map it votes in
4citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

4 citing papers in PubMed.

  1. Article
  2. Article
  3. Welfare implications of injuries and deformities in wild fish.Animal welfare (South Mimms, England) · 2026
    Review
  4. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Viktoria SiewertInstitute for Neuro- and Behavioural Biology, University of Münster, Badestr. 13, Münster, 48149, Germany.ORCID 0000-0001-5787-9288
Sylvia Kaiser *Institute for Neuro- and Behavioural Biology, University of Münster, Badestr. 13, Münster, 48149, Germany.
Norbert Sachser *Institute for Neuro- and Behavioural Biology, University of Münster, Badestr. 13, Münster, 48149, Germany.
S Helene Richter *Institute for Neuro- and Behavioural Biology, University of Münster, Badestr. 13, Münster, 48149, Germany.

Funding

Deutsche Forschungsgemeinschaft 316099922Deutsche Forschungsgemeinschaft 396776123
6 · The paper itself

Abstract

Originating from human psychology, the concepts of "optimism" and "pessimism" were transferred to animal welfare science about 20 years ago to study emotional states in non-human animals. Over time, "optimism" and "pessimism" have developed into valuable welfare indicators, but little focus has been put on the ecological implications of this concept. Here, we aim to bridge this gap and underline the great potential for transferring it to behavioural ecology. We start by outlining why "optimism" and "pessimism" can be considered as aspects of animal personalities. Furthermore, we argue that considering "optimism"/"pessimism" in a behavioural ecology context can facilitate our understanding of individual adjustment to the environment. Specifically, we show how variation in "optimism"/"pessimism" can play a crucial role in adaptation processes to environmental heterogeneity, for example, niche choice and niche conformance. Building on these considerations, we hypothesise that "optimists" might be less plastic than "pessimists" in their behaviour, which could considerably affect the way they adjust to environmental change.

Indexed as

Behavior, AnimalOptimismPessimismAnimalsanimal personalityenvironmental changeindividualised nicheoptimismpessimismphenotypic plasticity

Identifiers

PMID39711313
PMCPMC12120394

What Socratic holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.