Raspodjela biomase simpatrijskih sisavaca u južnoj Europi

undergraduate thesis

• Title (english): Biomass distribution of sympatric mammals in southern Europe
• Author: Andro Pleskalt
• Mentor: Frederik Dalerum https://orcid.org/0000-0001-9737-8242 (mentor)
• Mentor: Perica Mustafić (komentor)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2024-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Raspodjela biomase među trofičkim razinama i različitim vrstama organizama važna je
karakteristika ekosustava i vjerojatno je doživjela velike promjene uzrokovane ljudskim
aktivnostima. U ovom radu istražena je raspodjela biomase 10 vrsta sisavaca u Kantabrijskim
planinama na sjeveru Španjolske koristeći podatke s fotozamki i model procjene brojnosti
temeljen na zauzeću. Raspodjela nije slijedila pravilo prijenosa 10 % biomase po trofičkoj
razini, niti je biomasa grabežljivaca rasla s eksponentom ¾ u odnosu na biomasu plijena.
Umjesto toga, raspodjela je bila koncentrirana na niže trofičke razine s nerazmjerno malom
biomasom grabežljivaca, osobito velikih mesoždera. Osim toga, omjer biomase potrošača i
proizvođača bio je niži od teorijskih očekivanja. Rezultati ovog istraživanja vjerojatno
predstavljaju gornji kraj raspona biomase sisavaca u umjerenim šumama južne Europe, budući
da su podaci uglavnom prikupljeni iz kamera postavljenih unutar zaštićenih područja. Daljnja
istraživanja s poboljšanim uzorkovanjem i metodologijom mogla bi povećati preciznost
procjene biomase, ali smatram da uočena odstupanja između opaženih raspodjela biomase i
teorijskih očekivanja predstavljaju jasan primjer radikalnih učinaka koje su ljudske aktivnosti
imale na strukturu kopnenih ekosustava.

Abstract (english)

The distribution of biomass among trophic levels and different types of organisms is an
important characteristic of ecosystems and has likely seen large perturbations caused by human
activities. The biomass distribution of 10 mammal species was investigated in the Cantabrian
Mountains in northern Spain using camera trap data and an occupancy based abundance model.
The distribution did not follow the rule of 10 % biomass transfer per trophic level nor did
predator biomass scale with a ¾ power exponent in relation to the biomass of its prey. Instead,
the distribution was bottom heavy with a disproportionally low predator biomass, in particular
large carnivore biomass. In addition, the ratio of consumer to producer biomass was lower than
theoretical expectations. Furthermore, the results in this study likely represent the upper end of
the range of mammal biomass in southern European temperate forest, as the data were mostly
derived from cameras placed inside protected areas. More research with improved sampling
and methodology could increase the precision of biomass estimation, but I suggest that the
observed deviations between the observed biomass distributions and theoretical expectations
provide a strong example of the radical effects human activities has had on the structure of
terrestrial ecosystems.

• Keywords: raspodjela biomase; sisavci; ekologija zajednica; umjerena šuma; fotozamke; model zauzeća
• Keywords (english): biomass distribution; mammals; community ecology; temperate forest; camera trapping; occupancy models
• Language: croatian
• URN:NBN: urn:nbn:hr:217:769711
• Study programme: Title: Environmental Sciences-University undergraduate programme; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) struke znanosti o okolišu)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-10-03 09:10:00